xref: /docs/en/application-dev/ui/ui-js-components-switch.md

# <switch> Development


The **<switch>** component is used to switch between the on and off states. For details, see [switch](../reference/arkui-js/js-components-basic-switch.md).


## Creating a <switch> Component

Create a **<switch>** component in the .hml file under **pages/index**.


```html
<div class="container">
    <switch></switch>
</div>
```


```css
/* xxx.css */
.container {
  flex-direction: column;
  background-color: #F1F3F5;
}
```

![en-us_image_0000001231843096](figures/en-us_image_0000001231843096.png)


## Adding Attributes and Methods

Use the **textoff** and **showtext** attributes to set the status when text is selected and unselected. Set the **checked** attribute to **true** (indicating that the component is on). Add the **change** event that is triggered when the component status changes. After the event is triggered, the **switchChange** function is executed to obtain the current component status (on or off).

```html
<!-- xxx.hml -->
<div class="container">
  <switch showtext="true" texton="open" textoff="close" checked="true" @change="switchChange"></switch>
</div>
```


```
/* xxx.css */
.container {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #F1F3F5;
}
switch{
  texton-color: #002aff;
  textoff-color: silver;
  text-padding: 20px;
  font-size: 50px;
}
```


```css
// xxx.js
import prompt from '@system.prompt';
export default {
  switchChange(e){
    if(e.checked){
      prompt.showToast({
        message: "open"
      });
    }else{
      prompt.showToast({
        message: "close"
      });
    }
  }
}
```


![en-us_image_0000001276003505](figures/en-us_image_0000001276003505.gif)


> **NOTE**
>
> The text set by **texton** and **textoff** takes effect only when **showtext** is set to **true**.


## Example Scenario

Turn on the switch and the default delivery address is used. When the switch is turned off, the address selection button is displayed on the page. Clicking the button can change the delivery address.

  Implementation method: Create a **&lt;switch&gt;** component, set the **checked** attribute to **true**, and change the delivery address through data binding. Set the **display** attribute (the default value is **none**). When the switch is turned off and the **display** attribute is set to **flex**, the address module is displayed and clicking the button can change the color.

```html
<!-- xxx.hml -->
<div class="container">
  <div class="change">
    <text>Choose default address:</text>
    <switch showtext="true" texton="on" textoff="off" checked="true" @change="switchChange"></switch>
  </div>
  <div class="content">
    <text class="address"><span>Shipping address:</span><span class="textSpan">{{address}}</span></text>
  </div>
  <div class="myAddress" style="display: {{addressDisplay}};">
    <text style="font-size: 30px;margin-bottom: 50px;">Choose an address:</text>
    <text class="addressText" style="background-color: {{item == address?'#0fabe7':''}};color: {{item == address?'white':'black'}};"
    for="item in addressList"@click="changeAddress({{$idx}}})">{{item}}</text>
  </div>
</div>
```


```css
/* xxx.css */
.container {
  width: 100%;
  height: 100%;
  background-color: #F1F3F5;
  flex-direction: column;
  padding: 50px;
}
.change{
  margin-top: 20%;
  width: 100%;
  justify-content: center;
}
switch{
  texton-color: #002aff;
  textoff-color: silver;
  text-padding: 20px;
}
.content{
  width: 70%;
  text-align: center;
  flex-direction: column;
  border: 1px solid #002aff;
  margin-left: 15%;
  text-align: center;
}
.address{
  width: 100%;
  height: 100px;
  line-height: 100px;
  text-align: center;
  font-size: 28px;
  margin-bottom: 50px;
}
.textSpan{
  color: #0aa9f1;
}
.myAddress{
  flex-direction: column;
  margin-top: 50px;
}
.addressText{
  margin-left: 35%;
  width: 30%;
  height: 75px;
  text-align: center;
  color: white;
  margin-bottom: 30px;
  border-radius: 10px;
  border: 1px solid #0fabe7;
}
```


```js
// xxx.js
import prompt from '@system.prompt';
export default {
  data:{
    address: '',
    addressDisplay: 'none',
    addressList: ['family','company','commissary'],
  },
  onInit(){
    // Initialize the default address to the first one in the address list.
    this.address = this.addressList[0];
  },
  switchChange(e){
    if(e.checked){
        this.addressDisplay = "none";
    }else{
        this.addressDisplay = "flex";
    }
  },
  changeAddress(i){
    this.address= this.addressList[i];
  }
}
```

![en-us_image_0000001231843100](figures/en-us_image_0000001231843100.gif)