ui-js-component-tabs.md

# <tabs> Development


The <tabs> component is a common UI component for navigation. It allows quick access to different functions of an app. For details, see [tabs](../reference/arkui-js/js-components-container-tabs.md).


## Creating Tabs

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


```
<!-- index.hml -->
<div class="container" >
  <tabs>
   <tab-bar>
      <text>item1</text>
      <text>item2</text>
    </tab-bar>
    <tab-content>
      <div class="text">
        <text>content1</text>
      </div>
      <div class="text">
        <text>content2</text>
      </div>
    </tab-content>
  </tabs>
</div>
```


```
/* xxx.css */
.container {
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: #F1F3F5;
}
.text{
  width: 100%;
  height: 100%;
  justify-content: center;
  align-items: center;
}
```

![en-us_image_0000001223287676](figures/en-us_image_0000001223287676.gif)


## Setting the Tabs Orientation

By default, the active tab of a &lt;tabs&gt; component is the one with the specified index. To show the &lt;tabs&gt; vertically, set the vertical attribute to true.


```
<!-- index.hml -->
<div class="container" style="background-color:#F1F3F5;">
  <tabs index="1"  vertical="true">
    <tab-bar >
      <text>item1</text>
      <text style="margin-top: 50px;">item2</text>
    </tab-bar>
    <tab-content>
      <div>
        <image src="common/images/bg-tv.jpg" style="object-fit: contain;"> </image>
      </div>
      <div>
        <image src="common/images/img1.jpg" style="object-fit: contain;"> </image>
      </div>
    </tab-content>
  </tabs>
</div>
```

![en-us_image_0000001222967756](figures/en-us_image_0000001222967756.gif)

Set the mode attribute to enable the child components of the <tab-bar> to be evenly distributed. Set the scrollable attribute to disable scrolling of the <tab-content>.


```
<!-- index.hml -->
<div class="container" style="background-color:#F1F3F5;">
  <tabs style="margin-top: 30px;">
    <tab-bar mode="fixed">
      <text>item1</text>
      <text>item2</text>
    </tab-bar>
    <tab-content scrollable="false">
      <div>
        <image src="common/images/bg-tv.jpg" style="object-fit: contain;"> </image>
      </div>
      <div>
        <image src="common/images/img2.jpg" style="object-fit: contain;"> </image>
      </div>
    </tab-content>
  </tabs>
</div>
```

![en-us_image_0000001267647857](figures/en-us_image_0000001267647857.gif)


## Setting the Style

  Set the background color, border, and tab-content layout of the &lt;tabs&gt; component.

```
<!-- index.hml -->
<div class="container">
  <tabs class="tabs">
    <tab-bar class="tabBar">
      <text class="tabBarItem">item1</text>
      <text class="tabBarItem">item2</text>
    </tab-bar>
    <tab-content class="tabContent">
      <div class="tabContent">
        <text>content1</text>
      </div>
      <div class="tabContent" >
        <text>content2</text>
      </div>
    </tab-content>
  </tabs>
</div>
```


```
/* xxx.css */
.container {
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
 background-color:#F1F3F5;
}
.tabs{
  margin-top: 20px;
 border: 1px solid #2262ef;
  width: 99%;
  padding: 10px;
}
.tabBar{
  width: 100%;
  border: 1px solid #78abec;
}
.tabContent{
  width: 100%;
  margin-top: 10px;
  height: 300px;
  color: blue;   
  justify-content: center;  align-items: center;
}
```

![en-us_image_0000001267767857](figures/en-us_image_0000001267767857.gif)


## Displaying the Tab Index

Add the change event for the &lt;tabs&gt; component to display the index of the current tab after tab switching.


```
<!-- index.hml -->
<div class="container" style="background-color:#F1F3F5;">
  <tabs class="tabs" onchange="tabChange">
    <tab-bar class="tabBar">
      <text class="tabBarItem">item1</text>
      <text class="tabBarItem">item2</text>
    </tab-bar>
    <tab-content class="tabContent">
      <div>
        <image src="common/images/bg-tv.jpg" style="object-fit: contain;"> </image>
      </div>
      <div>
        <image src="common/images/img1.jpg" style="object-fit: contain;"> </image>
      </div>
    </tab-content>
  </tabs>
</div>
```


```
/* index.js */
import prompt from '@system.prompt';
export default {
  tabChange(e){
    prompt.showToast({
      message: "Tab index: " + e.index
    })
  }
}
```

![en-us_image_0000001222807772](figures/en-us_image_0000001222807772.gif)


> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**:
> - A &lt;tabs&gt; can wrap at most one [<tab-bar>](../reference/arkui-js/js-components-container-tab-bar.md) and at most one [<tab-content>](../reference/arkui-js/js-components-container-tab-content.md).


## Example Scenario

In this example, you can switch between tabs and the active tab has the title text in red with an underline below.

Use the &lt;tabs&gt;, <tab-bar>, and <tab-content> components to implement tab switching. Then define the arrays and attributes. Add the change event to change the attribute values in the arrays so that the active tab has a different font color and an underline.


```
<!-- index.hml -->
<div class="container">
  <tabs onchange="changeTabactive">
    <tab-content>
      <div class="item-container" for="datas.list">
        <div if="{{$item.title=='List1'?true:false}}">
          <image src="common/images/bg-tv.jpg" style="object-fit: contain;"> </image>
        </div>
        <div if="{{$item.title=='List2'?true:false}}">
          <image src="common/images/img1.jpg" style="object-fit: none;"> </image>
        </div>
        <div if="{{$item.title=='List3'?true:false}}">
          <image src="common/images/img2.jpg" style="object-fit: contain;"> </image>
        </div>
      </div>
    </tab-content>
    <tab-bar class="tab_bar mytabs" mode="scrollable">
      <div class="tab_item" for="datas.list">
        <text style="color: {{$item.color}};">{{$item.title}}</text>
        <div class="underline-show" if="{{$item.show}}"></div>
        <div class="underline-hide" if="{{!$item.show}}"></div>
      </div>
    </tab-bar>
  </tabs>
</div>
```


```
/* xxx.css */
.container{
background-color:#F1F3F5;
}
.tab_bar {
  width: 100%;
}
.tab_item {
  flex-direction: column;
  align-items: center;
}
.tab_item text {
  font-size: 32px;
}
.item-container {
  justify-content: center;
  flex-direction: column;
}
.underline-show {
  height: 2px;
  width: 160px;
  background-color: #FF4500;
  margin-top: 7.5px;
}
.underline-hide {
  height: 2px;
  margin-top: 7.5px;
  width: 160px;
}
```


```
/* index.js */
import prompt from '@system.prompt';
export default {
  data() {
    return {
      datas: {
        color_normal: '#878787',
        color_active: '#ff4500',
        show: true,
        list: [{
          i: 0,
          color: '#ff4500',
          show: true,
          title: 'List1'
        }, {
          i: 1,
          color: '#878787',
          show: false,
          title: 'List2'
        }, {
           i: 2,
           color: '#878787',
           show: false,
           title: 'List3'
        }]
      }
    }
  },
  changeTabactive (e) {
    for (let i = 0; i < this.datas.list.length; i++) {
      let element = this.datas.list[i];
      element.show = false;
      element.color = this.datas.color_normal;
      if (i === e.index) {
        element.show = true;
        element.color = this.datas.color_active;
      }
    }
  }
}
```

![en-us_image_0000001267607885](figures/en-us_image_0000001267607885.gif)