reference/apis/js-apis-app-form-formHost.md

# @ohos.app.form.formHost (formHost)

The **formHost** module provides APIs related to the widget host, which is an application that displays the widget content and controls the position where the widget is displayed. You can use the APIs to delete, release, and update widgets installed by the same user, and obtain widget information and status.

> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
>
> The APIs provided by this module are system APIs.

## Modules to Import

```ts
import formHost from '@ohos.app.form.formHost';
```

## deleteForm

deleteForm(formId: string, callback: AsyncCallback&lt;void&gt;): void

Deletes a widget. After this API is called, the application can no longer use the widget, and the Widget Manager will not retain the widget information. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the widget is deleted, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.deleteForm(formId, (error: Base.BusinessError) => {
  if (error) {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  } else {
    console.log('formHost deleteForm success');
  }
  });
} catch (error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## deleteForm

deleteForm(formId: string): Promise&lt;void&gt;

Deletes a widget. After this API is called, the application can no longer use the widget, and the Widget Manager will not retain the widget information. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|


**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Parameters**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.deleteForm(formId).then(() => {
    console.log('formHost deleteForm success');
  }).catch((error: Base.BusinessError) => {
    console.error(`formHost deleteForm, error: ${JSON.stringify(error)}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## releaseForm

releaseForm(formId: string, callback: AsyncCallback&lt;void&gt;): void

Releases a widget. After this API is called, the application can no longer use the widget, but the Widget Manager still retains the widget cache and storage information. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the widget is released, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.releaseForm(formId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## releaseForm

releaseForm(formId: string, isReleaseCache: boolean, callback: AsyncCallback&lt;void&gt;): void

Releases a widget. After this API is called, the application can no longer use the widget, but the Widget Manager retains the storage information about the widget and retains or releases the cache information based on the setting. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name        | Type    | Mandatory| Description       |
| -------------- | ------  | ---- | ----------- |
| formId         | string  | Yes  | Widget ID.    |
| isReleaseCache | boolean | Yes  | Whether to release the cache.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the widget is released, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.releaseForm(formId, true, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## releaseForm

releaseForm(formId: string, isReleaseCache?: boolean): Promise&lt;void&gt;

Releases a widget. After this API is called, the application can no longer use the widget, but the Widget Manager retains the storage information about the widget and retains or releases the cache information based on the setting. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name        | Type    | Mandatory| Description       |
| -------------- | ------  | ---- | ----------- |
| formId         | string  | Yes  | Widget ID.    |
| isReleaseCache | boolean | No  | Whether to release the cache. The default value is **false**. |

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.releaseForm(formId, true).then(() => {
    console.log('formHost releaseForm success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## requestForm

requestForm(formId: string, callback: AsyncCallback&lt;void&gt;): void

Requests a widget update. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the widget is updated, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.requestForm(formId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## requestForm

requestForm(formId: string): Promise&lt;void&gt;

Requests a widget update. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.requestForm(formId).then(() => {
    console.log('formHost requestForm success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}

```

## castToNormalForm

castToNormalForm(formId: string, callback: AsyncCallback&lt;void&gt;): void

Converts a temporary widget to a normal one. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the widget is converted to a normal one, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501002 | The number of forms exceeds upper bound. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.castToNormalForm(formId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## castToNormalForm

castToNormalForm(formId: string): Promise&lt;void&gt;

Converts a temporary widget to a normal one. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501002 | The number of forms exceeds upper bound. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string = '12400633174999288';
  formHost.castToNormalForm(formId).then(() => {
    console.log('formHost castTempForm success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyVisibleForms

notifyVisibleForms(formIds: Array&lt;string&gt;, callback: AsyncCallback&lt;void&gt;): void

Instructs the widget framework to make a widget visible. After this API is called, **onVisibilityChange** is invoked to notify the widget provider. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds  | Array&lt;string&gt;       | Yes  | List of widget IDs.        |
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If a notification is sent to the widget framework to make the widget visible, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.notifyVisibleForms(formId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyVisibleForms

notifyVisibleForms(formIds: Array&lt;string&gt;): Promise&lt;void&gt;

Instructs the widget framework to make a widget visible. After this API is called, **onVisibilityChange** is invoked to notify the widget provider. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.notifyVisibleForms(formId).then(() => {
    console.log('formHost notifyVisibleForms success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyInvisibleForms

notifyInvisibleForms(formIds: Array&lt;string&gt;, callback: AsyncCallback&lt;void&gt;): void

Instructs the widget framework to make a widget invisible. After this API is called, **onVisibilityChange** is invoked to notify the widget provider. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds  | Array&lt;string&gt;       | Yes  | List of widget IDs.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If a notification is sent to the widget framework to make the widget invisible, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.notifyInvisibleForms(formId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyInvisibleForms

notifyInvisibleForms(formIds: Array&lt;string&gt;): Promise&lt;void&gt;

Instructs the widget framework to make a widget invisible. After this API is called, **onVisibilityChange** is invoked to notify the widget provider. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.notifyInvisibleForms(formId).then(() => {
    console.log('formHost notifyInvisibleForms success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## enableFormsUpdate

enableFormsUpdate(formIds: Array&lt;string&gt;, callback: AsyncCallback&lt;void&gt;): void

Instructs the widget framework to make a widget updatable. After this API is called, the widget is in the enabled state and can receive updates from the widget provider. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds  | Array&lt;string&gt;       | Yes  | List of widget IDs.        |
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If a notification is sent to the widget framework to make the widget updatable, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.enableFormsUpdate(formId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## enableFormsUpdate

enableFormsUpdate(formIds: Array&lt;string&gt;): Promise&lt;void&gt;

Instructs the widget framework to make a widget updatable. After this API is called, the widget is in the enabled state and can receive updates from the widget provider. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.enableFormsUpdate(formId).then(() => {
    console.log('formHost enableFormsUpdate success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## disableFormsUpdate

disableFormsUpdate(formIds: Array&lt;string&gt;, callback: AsyncCallback&lt;void&gt;): void

Instructs the widget framework to make a widget not updatable. After this API is called, the widget cannot receive updates from the widget provider. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds  | Array&lt;string&gt;       | Yes  | List of widget IDs.        |
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If a notification is sent to the widget framework to make the widget not updatable, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.disableFormsUpdate(formId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## disableFormsUpdate

disableFormsUpdate(formIds: Array&lt;string&gt;): Promise&lt;void&gt;

Instructs the widget framework to make a widget not updatable. After this API is called, the widget cannot receive updates from the widget provider. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formId: string[] = ['12400633174999288'];
  formHost.disableFormsUpdate(formId).then(() => {
    console.log('formHost disableFormsUpdate success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## isSystemReady

isSystemReady(callback: AsyncCallback&lt;void&gt;): void

Checks whether the system is ready. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the check is successful, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 202 | The application is not a system application.   |
| 401 | If the input parameter is not valid parameter. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  formHost.isSystemReady((error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## isSystemReady

isSystemReady(): Promise&lt;void&gt;

Checks whether the system is ready. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.Form

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 202 | The application is not a system application.   |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  formHost.isSystemReady().then(() => {
    console.log('formHost isSystemReady success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## getAllFormsInfo

getAllFormsInfo(callback: AsyncCallback&lt;Array&lt;formInfo.FormInfo&gt;&gt;): void

Obtains the widget information provided by all applications on the device. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.GET_BUNDLE_INFO_PRIVILEGED

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type                                                                                          | Mandatory| Description   |
| ------ |----------------------------------------------------------------------------------------------| ---- | ------- |
| callback | AsyncCallback&lt;Array&lt;[formInfo.FormInfo](js-apis-app-form-formInfo.md#forminfo)&gt;&gt; | Yes| Callback used to return the result. If the widget information is obtained, **error** is undefined and **data** is the information obtained; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).


**Example**

```ts
import formInfo from '@ohos.app.form.formInfo';
import Base from '@ohos.base';

try {
  formHost.getAllFormsInfo((error: Base.BusinessError, data: formInfo.FormInfo[]) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    } else {
      console.log(`formHost getAllFormsInfo, data: ${JSON.stringify(data)}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## getAllFormsInfo

getAllFormsInfo(): Promise&lt;Array&lt;formInfo.FormInfo&gt;&gt;

Obtains the widget information provided by all applications on the device. This API uses a promise to return the result.

**Required permissions**: ohos.permission.GET_BUNDLE_INFO_PRIVILEGED

**System capability**: SystemCapability.Ability.Form

**Return value**

| Type                                                                                    | Description                   |
|:---------------------------------------------------------------------------------------|:----------------------|
| Promise&lt;Array&lt;[formInfo.FormInfo](js-apis-app-form-formInfo.md#forminfo)&gt;&gt; | Promise used to return the information obtained.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formInfo from '@ohos.app.form.formInfo';
import Base from '@ohos.base';

try {
  formHost.getAllFormsInfo().then((data: formInfo.FormInfo[]) => {
    console.log(`formHost getAllFormsInfo data: ${JSON.stringify(data)}`);
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## getFormsInfo

getFormsInfo(bundleName: string, callback: AsyncCallback&lt;Array&lt;formInfo.FormInfo&gt;&gt;): void

Obtains the widget information provided by a given application on the device. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.GET_BUNDLE_INFO_PRIVILEGED

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type                                                                                          | Mandatory| Description   |
| ------ |----------------------------------------------------------------------------------------------| ---- | ------- |
| bundleName | string                                                                                       | Yes| Bundle name of the application.|
| callback | AsyncCallback&lt;Array&lt;[formInfo.FormInfo](js-apis-app-form-formInfo.md#forminfo)&gt;&gt; | Yes| Callback used to return the result. If the widget information is obtained, **error** is undefined and **data** is the information obtained; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16500100 | Failed to obtain the configuration information. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formInfo from '@ohos.app.form.formInfo';
import Base from '@ohos.base';

try {
  formHost.getFormsInfo('com.example.ohos.formjsdemo', (error: Base.BusinessError, data: formInfo.FormInfo[]) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    } else {
      console.log(`formHost getFormsInfo, data: ${JSON.stringify(data)}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## getFormsInfo

getFormsInfo(bundleName: string, moduleName: string, callback: AsyncCallback&lt;Array&lt;formInfo.FormInfo&gt;&gt;): void

Obtains the widget information provided by a given application on the device. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.GET_BUNDLE_INFO_PRIVILEGED

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type                                                                                          | Mandatory| Description   |
| ------ |----------------------------------------------------------------------------------------------| ---- | ------- |
| bundleName | string                                                                                       | Yes| Bundle name of the application.|
| moduleName | string                                                                                       | Yes|  Module name.|
| callback | AsyncCallback&lt;Array&lt;[formInfo.FormInfo](js-apis-app-form-formInfo.md#forminfo)&gt;&gt; | Yes| Callback used to return the result. If the widget information is obtained, **error** is undefined and **data** is the information obtained; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16500100 | Failed to obtain the configuration information. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formInfo from '@ohos.app.form.formInfo';
import Base from '@ohos.base';

try {
  formHost.getFormsInfo('com.example.ohos.formjsdemo', 'entry', (error: Base.BusinessError, data: formInfo.FormInfo[]) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    } else {
      console.log('formHost getFormsInfo, data: ${JSON.stringify(data)}');
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## getFormsInfo

getFormsInfo(bundleName: string, moduleName?: string): Promise&lt;Array&lt;formInfo.FormInfo&gt;&gt;

Obtains the widget information provided by a given application on the device. This API uses a promise to return the result.

**Required permissions**: ohos.permission.GET_BUNDLE_INFO_PRIVILEGED

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| bundleName | string | Yes| Bundle name of the application.|
| moduleName | string | No|  Module name. By default, no value is passed.|

**Return value**

| Type                                                                                    | Description                               |
|:---------------------------------------------------------------------------------------| :---------------------------------- |
| Promise&lt;Array&lt;[formInfo.FormInfo](js-apis-app-form-formInfo.md#forminfo)&gt;&gt; | Promise used to return the information obtained.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16500100 | Failed to obtain the configuration information. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formInfo from '@ohos.app.form.formInfo';
import Base from '@ohos.base';

try {
  formHost.getFormsInfo('com.example.ohos.formjsdemo', 'entry').then((data: formInfo.FormInfo[]) => {
    console.log(`formHost getFormsInfo, data: ${JSON.stringify(data)}`);
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## deleteInvalidForms

deleteInvalidForms(formIds: Array&lt;string&gt;, callback: AsyncCallback&lt;number&gt;): void

Deletes invalid widgets from the list. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of valid widget IDs.|
| callback | AsyncCallback&lt;number&gt; | Yes| Callback used to return the result. If the invalid widgets are deleted, **error** is undefined and **data** is the number of widgets deleted; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formIds: string[] = new Array('12400633174999288', '12400633174999289');
  formHost.deleteInvalidForms(formIds, (error: Base.BusinessError, data: number) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    } else {
      console.log(`formHost deleteInvalidForms, data: ${JSON.stringify(data)}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## deleteInvalidForms

deleteInvalidForms(formIds: Array&lt;string&gt;): Promise&lt;number&gt;

Deletes invalid widgets from the list. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of valid widget IDs.|

**Return value**

| Type         | Description                               |
| :------------ | :---------------------------------- |
| Promise&lt;number&gt; | Promise used to return the number of widgets deleted.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

try {
  let formIds: string[] = new Array('12400633174999288', '12400633174999289');
  formHost.deleteInvalidForms(formIds).then((data: number) => {
    console.log(`formHost deleteInvalidForms, data: ${JSON.stringify(data)}`);
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## acquireFormState

acquireFormState(want: Want, callback: AsyncCallback&lt;formInfo.FormStateInfo&gt;): void

Obtains the widget state. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM and ohos.permission.GET_BUNDLE_INFO_PRIVILEGED

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| want | [Want](js-apis-app-ability-want.md) | Yes  | **Want** information carried to query the widget state. The information must contain the bundle name, ability name, module name, widget name, and widget dimensions.|
| callback | AsyncCallback&lt;[formInfo.FormStateInfo](js-apis-app-form-formInfo.md#formstateinfo)&gt; | Yes| Callback used to return the result. If the widget state is obtained, **error** is undefined and **data** is the widget state obtained; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16500100 | Failed to obtain the configuration information. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Want from '@ohos.app.ability.Want';
import formInfo from '@ohos.app.form.formInfo';
import Base from '@ohos.base';

let want: Want = {
  'deviceId': '',
  'bundleName': 'ohos.samples.FormApplication',
  'abilityName': 'FormAbility',
  'parameters': {
    'ohos.extra.param.key.module_name': 'entry',
    'ohos.extra.param.key.form_name': 'widget',
    'ohos.extra.param.key.form_dimension': 2
  }
};
try {
  formHost.acquireFormState(want, (error:Base.BusinessError, data: formInfo.FormStateInfo) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    } else {
      console.log(`formHost acquireFormState, data: ${JSON.stringify(data)}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## acquireFormState

acquireFormState(want: Want): Promise&lt;formInfo.FormStateInfo&gt;

Obtains the widget state. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM and ohos.permission.GET_BUNDLE_INFO_PRIVILEGED

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| want   | [Want](js-apis-app-ability-want.md) | Yes  | **Want** information carried to query the widget state. The information must contain the bundle name, ability name, module name, widget name, and widget dimensions.|

**Return value**

| Type         | Description                               |
| :------------ | :---------------------------------- |
| Promise&lt;[formInfo.FormStateInfo](js-apis-app-form-formInfo.md#formstateinfo)&gt; | Promise used to return the widget state obtained.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16500100 | Failed to obtain the configuration information. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Want from '@ohos.app.ability.Want';
import formInfo from '@ohos.app.form.formInfo';
import Base from '@ohos.base';

let want: Want = {
  'deviceId': '',
  'bundleName': 'ohos.samples.FormApplication',
  'abilityName': 'FormAbility',
  'parameters': {
    'ohos.extra.param.key.module_name': 'entry',
    'ohos.extra.param.key.form_name': 'widget',
    'ohos.extra.param.key.form_dimension': 2
  }
};
try {
  formHost.acquireFormState(want).then((data: formInfo.FormStateInfo) => {
    console.log(`formHost acquireFormState, data: ${JSON.stringify(data)}`);
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## on('formUninstall')

on(type: 'formUninstall', callback: Callback&lt;string&gt;): void

Subscribes to widget uninstall events. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> Widget uninstall is different from widget removal. When an application is uninstalled, the corresponding widget is automatically uninstalled.

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| type | string | Yes  | Event type. The value **'formUninstall'** indicates a widget uninstall event.|
| callback | Callback&lt;string&gt; | Yes| Callback used to return the widget ID.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
formHost.on('formUninstall', (formId: string) => {
  console.log(`formHost on formUninstall, formId: ${formId}`);
});
```

## off('formUninstall')

off(type: 'formUninstall', callback?: Callback&lt;string&gt;): void

Unsubscribes from widget uninstall events. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> Widget uninstall is different from widget removal. When an application is uninstalled, the corresponding widget is automatically uninstalled.

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| type | string | Yes  | Event type. The value **'formUninstall'** indicates a widget uninstall event.|
| callback | Callback&lt;string&gt; | No| Callback used to return the widget ID. If it is left unspecified, it indicates the callback for all the events that have been subscribed.<br> To cancel the subscription with a given callback, this parameter must be set to the same value as **callback** in **on('formUninstall')**.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
formHost.off('formUninstall', (formId: string) => {
  console.log(`formHost on formUninstall, formId: ${formId}`);
});
```

## notifyFormsVisible

notifyFormsVisible(formIds: Array&lt;string&gt;, isVisible: boolean, callback: AsyncCallback&lt;void&gt;): void

Instructs the widgets to make themselves visible. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|
| isVisible | boolean | Yes  | Whether to make the widgets visible.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the notification is sent, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formIds: string[] = new Array('12400633174999288', '12400633174999289');
try {
  formHost.notifyFormsVisible(formIds, true, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyFormsVisible

notifyFormsVisible(formIds: Array&lt;string&gt;, isVisible: boolean): Promise&lt;void&gt;

Instructs the widgets to make themselves visible. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|
| isVisible | boolean | Yes  | Whether to make the widgets visible.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formIds: string[] = new Array('12400633174999288', '12400633174999289');
try {
  formHost.notifyFormsVisible(formIds, true).then(() => {
    console.log('formHost notifyFormsVisible success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyFormsEnableUpdate

notifyFormsEnableUpdate(formIds: Array&lt;string&gt;, isEnableUpdate: boolean, callback: AsyncCallback&lt;void&gt;): void

Instructs the widgets to enable or disable updates. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|
| isEnableUpdate | boolean | Yes  | Whether to make the widgets updatable.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the notification is sent, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formIds: string[] = new Array('12400633174999288', '12400633174999289');
try {
  formHost.notifyFormsEnableUpdate(formIds, true, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyFormsEnableUpdate

notifyFormsEnableUpdate(formIds: Array&lt;string&gt;, isEnableUpdate: boolean): Promise&lt;void&gt;

Instructs the widgets to enable or disable updates. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array&lt;string&gt; | Yes  | List of widget IDs.|
| isEnableUpdate | boolean | Yes  | Whether to make the widgets updatable.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formIds: string[] = new Array('12400633174999288', '12400633174999289');
try {
  formHost.notifyFormsEnableUpdate(formIds, true).then(() => {
    console.log('formHost notifyFormsEnableUpdate success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```
## shareForm

shareForm(formId: string, deviceId: string, callback: AsyncCallback&lt;void&gt;): void

Shares a specified widget with a remote device. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM and ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|
| deviceId | string | Yes  | Remote device ID.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the widget is shared, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formId: string = '12400633174999288';
let deviceId: string = 'EFC11C0C53628D8CC2F8CB5052477E130D075917034613B9884C55CD22B3DEF2';
try {
  formHost.shareForm(formId, deviceId, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## shareForm

shareForm(formId: string, deviceId: string): Promise&lt;void&gt;

Shares a specified widget with a remote device. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM and ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|
| deviceId | string | Yes  | Remote device ID.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16501000 | An internal functional error occurred. |
| 16501001 | The ID of the form to be operated does not exist. |
| 16501003 | The form can not be operated by the current application. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formId: string = '12400633174999288';
let deviceId: string = 'EFC11C0C53628D8CC2F8CB5052477E130D075917034613B9884C55CD22B3DEF2';
try {
  formHost.shareForm(formId, deviceId).then(() => {
    console.log('formHost shareForm success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyFormsPrivacyProtected

notifyFormsPrivacyProtected(formIds: Array\<string>, isProtected: boolean, callback: AsyncCallback\<void>): void

Notifies that the privacy protection status of the specified widgets changes. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formIds | Array\<string\> | Yes  | ID of the widgets.|
| isProtected | boolean | Yes  | Whether privacy protection is enabled.|
| callback | AsyncCallback\<void> | Yes| Callback used to return the result. If privacy protection is set successfully, **error** is undefined; otherwise, **error** is an error object.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formIds: string[] = new Array('12400633174999288', '12400633174999289');
try {
  formHost.notifyFormsPrivacyProtected(formIds, true, (error: Base.BusinessError) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## notifyFormsPrivacyProtected

notifyFormsPrivacyProtected(formIds: Array\<string\>, isProtected: boolean): Promise\<void\>

Notifies that the privacy protection status of the specified widgets changes. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name     | Type           | Mandatory| Description                            |
| ----------- | --------------- | ---- | -------------------------------- |
| formIds     | Array\<string\> | Yes  | ID of the widgets.|
| isProtected | boolean         | Yes  | Whether privacy protection is enabled.              |

**Return value**

| Type               | Description                     |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 202 | The application is not a system application. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

```ts
import Base from '@ohos.base';

let formIds: string[] = new Array('12400633174999288', '12400633174999289');
try {
  formHost.notifyFormsPrivacyProtected(formIds, true).then(() => {
    console.log('formHost notifyFormsPrivacyProtected success');
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## acquireFormData<sup>10+</sup>

acquireFormData(formId: string, callback: AsyncCallback\<Record\<string, Object>>): void

Requests data from the widget provider. This API uses an asynchronous callback to return the result.

**Model restriction**: This API can be used only in the stage model.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name| Type   | Mandatory| Description   |
| ------ | ------ | ---- | ------- |
| formId | string | Yes  | Widget ID.|
| callback | AsyncCallback\<Record\<string, Object> | Yes  | Callback used to return the API call result and the shared data.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16500100 | Failed to obtain the configuration information. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import Base from '@ohos.base';

let formId: string = '12400633174999288';
try {
  formHost.acquireFormData(formId, (error, data) => {
    if (error) {
      console.error(`error, code: ${error.code}, message: ${error.message}`);
    } else {
      console.log(`formHost acquireFormData, data: ${JSON.stringify(data)}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## acquireFormData<sup>10+</sup>

acquireFormData(formId: string): Promise\<Record\<string, Object>>

Requests data from the widget provider. This API uses a promise to return the result.

**Model restriction**: This API can be used only in the stage model.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name     | Type           | Mandatory| Description                            |
| ----------- | --------------- | ---- | -------------------------------- |
| formId | string | Yes  | Widget ID.|

**Return value**

| Type               | Description                     |
| ------------------- | ------------------------- |
| Promise\<Record\<string, Object>>| Promise used to return the API call result and the shared data.|

**Error codes**

| Error Code ID| Error Message|
| -------- | -------- |
| 201 | Permissions denied. |
| 401 | If the input parameter is not valid parameter. |
| 16500050 | An IPC connection error happened. |
| 16500060 | A service connection error happened, please try again later. |
| 16500100 | Failed to obtain the configuration information. |
| 16501000 | An internal functional error occurred. |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

```ts
import Base from '@ohos.base';

let formId: string = '12400633174999288';
try {
  formHost.acquireFormData(formId).then((data) => {
    console.log('formHost acquireFormData success' + data);
  }).catch((error: Base.BusinessError) => {
    console.error(`error, code: ${error.code}, message: ${error.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## setRouterProxy<sup>11+</sup>

setRouterProxy(formIds: Array&lt;string&gt;, proxy: Callback&lt;Want&gt;, callback: AsyncCallback&lt;void&gt;): void

Sets a router proxy for widgets and obtains the Want information required for redirection. This API uses an asynchronous callback to return the result.

> **NOTE**
>
>- Generally, for a widget added to the home screen, in the case of router-based redirection, the widget framework checks whether the destination is proper and whether the widget has the redirection permission, and then triggers redirection accordingly. For a widget that is added to a widget host and has a router proxy configured, in the case of router-based redirection, the widget framework does not trigger redirection for the widget. Instead, it returns the **want** parameter containing the destination to the widget host. Therefore, if the widget host wants to use the Want information for redirection, it must have the application redirection permission. For details, see [UIAbilityContext.startAbility()](js-apis-inner-application-uiAbilityContext.md#uiabilitycontextstartability).
>
>- Only one router proxy can be set for a widget. If multiple proxies are set, only the last proxy takes effect.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name  | Type                     | Mandatory| Description                                                        |
| -------- | ------------------------- | ---- | ------------------------------------------------------------ |
| formIds  | Array&lt;string&gt;       | Yes  | Array of widget IDs.                                              |
| proxy    | Callback&lt;Want&gt;      | Yes  | Callback used to return the Want information required for redirection.                        |
| callback | AsyncCallback&lt;void&gt; | Yes  | Callback used to return the result. If the router proxy is set, **error** is **undefined**; otherwise, an exception is thrown.|

**Error codes**

| Error Code ID| Error Message                                                    |
| -------- | ------------------------------------------------------------ |
| 201      | Permissions denied.                                          |
| 202      | The application is not a system application.                 |
| 401      | If the input parameter is not valid parameter.               |
| 16500050 | An IPC connection error happened.                            |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred.                       |
| 16501003 | The form can not be operated by the current application.     |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import common from '@ohos.app.ability.common';
import formHost from '@ohos.app.form.formHost';
import Base from '@ohos.base';
import Want from '@ohos.app.ability.Want';

@Entry
@Component
struct CardExample {
  private context = getContext(this) as common.UIAbilityContext;
  @State formId:number = 0;
  @State fwidth:number = 420;
  @State fheight:number = 280;

  build() {
    Column() {
      FormComponent({
        id:this.formId,
        name:"widget",
        bundle:"com.example.cardprovider",
        ability:"EntryFormAbility",
        module:"entry",
        dimension:FormDimension.Dimension_2_2,
        temporary:false,
      })
        .allowUpdate(true)
        .size({width:this.fwidth,height:this.fheight})
        .visibility(Visibility.Visible)
        .onAcquired((form)=>{
          console.log(`testTag form info : ${JSON.stringify(form)}`);
          this.formId = form.id;
          try {
            let formIds: string[] = [ this.formId.toString() ];
            formHost.setRouterProxy(formIds, (want: Want) => {
              console.info(`formHost recv router event, want: ${JSON.stringify(want)}`);
              // The widget host processes the redirection.
              this.context.startAbility(want, (err: Base.BusinessError) => {
                console.info(`formHost startAbility error, code: ${err.code}, message: ${err.message}`);
              });
            }, (err: Base.BusinessError) => {
              console.error(`set router proxy error, code: ${err.code}, message: ${err.message}`);
            })
          } catch (e) {
            console.log('formHost setRouterProxy catch exception: ' + JSON.stringify(e));
          }
        })
    }
    .width('100%')
    .height('100%')
  }
}
```

## setRouterProxy<sup>11+</sup>

setRouterProxy(formIds: Array&lt;string&gt;, proxy: Callback&lt;Want&gt;): Promise&lt;void&gt;

Sets a router proxy for widgets and obtains the Want information required for redirection. This API uses a promise to return the result.

> **NOTE**
>
>- Generally, for a widget added to the home screen, in the case of router-based redirection, the widget framework checks whether the destination is proper and whether the widget has the redirection permission, and then triggers redirection accordingly. For a widget that is added to a widget host and has a router proxy configured, in the case of router-based redirection, the widget framework does not trigger redirection for the widget. Instead, it returns the **want** parameter containing the destination to the widget host. Therefore, if the widget host wants to use the Want information for redirection, it must have the application redirection permission. For details, see [UIAbilityContext.startAbility()](js-apis-inner-application-uiAbilityContext.md#uiabilitycontextstartability).
>
>- Only one router proxy can be set for a widget. If multiple proxies are set, only the last proxy takes effect.


**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name | Type                | Mandatory| Description                                |
| ------- | -------------------- | ---- | ------------------------------------ |
| formIds | Array&lt;string&gt;  | Yes  | Array of widget IDs.                      |
| proxy   | Callback&lt;Want&gt; | Yes  | Callback used to return the Want information required for redirection.|

**Return value**

| Type               | Description                     |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message                                                    |
| -------- | ------------------------------------------------------------ |
| 201      | Permissions denied.                                          |
| 202      | The application is not a system application.                 |
| 401      | If the input parameter is not valid parameter.               |
| 16500050 | An IPC connection error happened.                            |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred.                       |
| 16501003 | The form can not be operated by the current application.     |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import common from '@ohos.app.ability.common';
import formHost from '@ohos.app.form.formHost';
import Base from '@ohos.base';
import Want from '@ohos.app.ability.Want';

@Entry
@Component
struct CardExample {
  private context = getContext(this) as common.UIAbilityContext;
  @State formId:number = 0;
  @State fwidth:number = 420;
  @State fheight:number = 280;

  build() {
    Column() {
      FormComponent({
        id:this.formId,
        name:"widget",
        bundle:"com.example.cardprovider",
        ability:"EntryFormAbility",
        module:"entry",
        dimension:FormDimension.Dimension_2_2,
        temporary:false,
      })
        .allowUpdate(true)
        .size({width:this.fwidth,height:this.fheight})
        .visibility(Visibility.Visible)
        .onAcquired((form)=>{
          console.log(`testTag form info : ${JSON.stringify(form)}`);
          this.formId = form.id;
          try {
            let formIds: string[] = [ this.formId.toString() ];
            formHost.setRouterProxy(formIds, (want: Want) => {
              console.info(`formHost recv router event, want: ${JSON.stringify(want)}`);
              // The widget host processes the redirection.
              this.context.startAbility(want, (err: Base.BusinessError) => {
                console.info(`formHost startAbility error, code: ${err.code}, message: ${err.message}`);
              });
            }).then(() => {
              console.info('formHost set router proxy success');
            }).catch((err: Base.BusinessError) => {
              console.error(`set router proxy error, code: ${err.code}, message: ${err.message}`);
            })
          } catch (e) {
            console.log('formHost setRouterProxy catch exception: ' + JSON.stringify(e));
          }
        })
    }
    .width('100%')
    .height('100%')
  }
}
```

## clearRouterProxy<sup>11+</sup>

clearRouterProxy(formIds:Array&lt;string&gt;, callback: AsyncCallback&lt;void&gt;): void

Clears the router proxy set for widgets. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name  | Type                     | Mandatory| Description                                                        |
| -------- | ------------------------- | ---- | ------------------------------------------------------------ |
| formIds  | Array&lt;string&gt;;      | Yes  | Array of widget IDs.                                              |
| callback | AsyncCallback&lt;void&gt; | Yes  | Callback used to return the result. If the router proxy is cleared, **error** is **undefined**; otherwise, an exception is thrown.|

**Error codes**

| Error Code ID| Error Message                                                    |
| -------- | ------------------------------------------------------------ |
| 201      | Permissions denied.                                          |
| 202      | The application is not a system application.                 |
| 401      | If the input parameter is not valid parameter.               |
| 16500050 | An IPC connection error happened.                            |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred.                       |
| 16501003 | The form can not be operated by the current application.     |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formHost from '@ohos.app.form.formHost';
import Base from '@ohos.base';
import Want from '@ohos.app.ability.Want';

try {
  let formIds: string[] = [ '12400633174999288' ];
  formHost.clearRouterProxy(formIds, (err: Base.BusinessError) => {
    if (err) {
        console.error(`formHost clear router proxy error, code: ${err.code}, message: ${err.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## clearRouterProxy<sup>11+</sup>

clearRouterProxy(formIds:Array&lt;string&gt;): Promise&lt;void&gt;

Clears the router proxy set for widgets. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name | Type               | Mandatory| Description          |
| ------- | ------------------- | ---- | -------------- |
| formIds | Array&lt;string&gt; | Yes  | Array of widget IDs.|

**Return value**

| Type               | Description                     |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message                                                    |
| -------- | ------------------------------------------------------------ |
| 201      | Permissions denied.                                          |
| 202      | The application is not a system application.                 |
| 401      | If the input parameter is not valid parameter.               |
| 16500050 | An IPC connection error happened.                            |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred.                       |
| 16501003 | The form can not be operated by the current application.     |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formHost from '@ohos.app.form.formHost';
import Base from '@ohos.base';
import Want from '@ohos.app.ability.Want';

try {
  let formIds: string[] = [ '12400633174999288' ];
  formHost.clearRouterProxy(formIds).then(() => {
    console.log('formHost clear rourter proxy success');
  }).catch((err: Base.BusinessError) => {
    console.error(`formHost clear router proxy error, code: ${err.code}, message: ${err.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```
## setFormsRecyclable<sup>11+</sup>

setFormsRecyclable(formIds:Array&lt;string&gt;, callback: AsyncCallback&lt;void&gt;): void

Sets widgets to be recyclable. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name  | Type                     | Mandatory| Description                                                        |
| -------- | ------------------------- | ---- | ------------------------------------------------------------ |
| formIds  | Array&lt;string&gt;;      | Yes  | Array of widget IDs.                                              |
| callback | AsyncCallback&lt;void&gt; | Yes  | Callback used to return the result. If the widgets are set to be recyclable, **error** is **undefined**; otherwise, an exception is thrown.|

**Error codes**

| Error Code ID| Error Message                                                    |
| -------- | ------------------------------------------------------------ |
| 16500050 | An IPC connection error happened.                            |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred.                       |
| 16501003 | The form can not be operated by the current application.     |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formHost from '@ohos.app.form.formHost';
import Base from '@ohos.base';
import Want from '@ohos.app.ability.Want';

try {
  let formIds: string[] = [ '12400633174999288' ];
  formHost.setFormsRecyclable(formIds, (err: Base.BusinessError) => {
    if (err) {
        console.error(`setFormsRecyclable error, code: ${err.code}, message: ${err.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

## setFormsRecyclable<sup>11+</sup>

setFormsRecyclable(formIds:Array&lt;string&gt;): Promise&lt;void&gt;

Sets widgets to be recyclable. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name | Type               | Mandatory| Description          |
| ------- | ------------------- | ---- | -------------- |
| formIds | Array&lt;string&gt; | Yes  | Array of widget IDs.|

**Return value**

| Type               | Description                     |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

| Error Code ID| Error Message                                                    |
| -------- | ------------------------------------------------------------ |
| 16500050 | An IPC connection error happened.                            |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred.                       |
| 16501003 | The form can not be operated by the current application.     |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formHost from '@ohos.app.form.formHost';
import Base from '@ohos.base';
import Want from '@ohos.app.ability.Want';

try {
  let formIds: string[] = [ '12400633174999288' ];
  formHost.setFormsRecyclable(formIds).then(() => {
    console.log('setFormsRecyclable success');
  }).catch((err: Base.BusinessError) => {
    console.error(`setFormsRecyclable error, code: ${err.code}, message: ${err.message}`);
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```
## recoverForms<sup>11+</sup>

recoverForms(formIds:Array&lt;string&gt;, callback: AsyncCallback&lt;void&gt;): void

Recovers widgets. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REQUIRE_FORM

**System capability**: SystemCapability.Ability.Form

**Parameters**

| Name  | Type                     | Mandatory| Description                                                        |
| -------- | ------------------------- | ---- | ------------------------------------------------------------ |
| formIds  | Array&lt;string&gt;;      | Yes  | Array of widget IDs.                                              |
| callback | AsyncCallback&lt;void&gt; | Yes  | Callback used to return the result. If the widgets are recovered, **error** is **undefined**; otherwise, an exception is thrown.|

**Error codes**

| Error Code ID| Error Message                                                    |
| -------- | ------------------------------------------------------------ |
| 16500050 | An IPC connection error happened.                            |
| 16500060 | A service connection error happened, please try again later. |
| 16501000 | An internal functional error occurred.                       |
| 16501003 | The form can not be operated by the current application.     |

For details about the error codes, see [Form Error Codes](../errorcodes/errorcode-form.md).

**Example**

```ts
import formHost from '@ohos.app.form.formHost';
import Base from '@ohos.base';
import Want from '@ohos.app.ability.Want';

try {
  let formIds: string[] = [ '12400633174999288' ];
  formHost.recoverForms(formIds, (err: Base.BusinessError) => {
    if (err) {
        console.error(`recoverForms error, code: ${err.code}, message: ${err.message}`);
    }
  });
} catch(error) {
  console.error(`catch error, code: ${(error as Base.BusinessError).code}, message: ${(error as Base.BusinessError).message}`);
}
```

##