# Interface (FocusQuery)
<!--Kit: Camera Kit-->
<!--Subsystem: Multimedia-->
<!--Owner: @qano-->
<!--SE: @leo_ysl-->
<!--TSE: @xchaosioda-->

> **NOTE**
>
> - The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.
> - This interface was first introduced in API version 12. In this version, a compatibility change was made that preserved the initial version information of inner elements. As a result, you might see outer element's @since version number being higher than that of the inner elements. However, this discrepancy does not affect the functionality of the interface.

FocusQuery provides APIs to check whether a focus mode is supported.

## Modules to Import

```ts
import { camera } from '@kit.CameraKit';
```

## isFocusModeSupported<sup>11+</sup>

isFocusModeSupported(afMode: FocusMode): boolean

Checks whether a focus mode is supported.

**Atomic service API**: This API can be used in atomic services since API version 19.

**System capability**: SystemCapability.Multimedia.Camera.Core

**Parameters**

| Name     | Type                    | Mandatory| Description                             |
| -------- | ----------------------- | ---- | -------------------------------- |
| afMode   | [FocusMode](arkts-apis-camera-e.md#focusmode) | Yes  | Focus mode. If the input parameter is null or undefined, it is treated as 0 and manual focus is used.                   |

**Return value**

| Type       | Description                         |
| ---------- | ----------------------------- |
| boolean    | Check result for the support of the focus mode. **true** if supported, **false** otherwise. If the operation fails, an error code defined in [CameraErrorCode](arkts-apis-camera-e.md#cameraerrorcode) is returned.|

**Error codes**

For details about the error codes, see [Camera Error Codes](errorcode-camera.md).

| ID        | Error Message       |
| --------------- | --------------- |
| 7400103                |  Session not config, only throw in session usage.          |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

function isFocusModeSupported(photoSession: camera.PhotoSession): boolean {
  let status: boolean = false;
  try {
    status = photoSession.isFocusModeSupported(camera.FocusMode.FOCUS_MODE_AUTO);
  } catch (error) {
    // If the operation fails, error.code is returned and processed.
    let err = error as BusinessError;
    console.error(`The isFocusModeSupported call failed. error code: ${err.code}`);
  }
  return status;
}
```