ui-js-building-ui-layout-external-container.md

# Adding a Container


To assemble the basic elements of a page, you need a container component. The <div>, <list>, and <tabs> components are commonly used for laying out page elements. You can use <div> as the container in a page with simple layout. <div> supports a variety of child components required to build the page.


## <List>

If you use <div> repeatedly to render a complex page, frame freezing may occur. In this case, use the <list> component instead of <div> to lay out list items, which provides a smooth list scrolling. **NOTE** that <list> supports only <list-item> as it child components. The following is an example:


```
<!-- xxx.hml -->
<list class="list">
  <list-item type="listItem" for="{{textList}}">
    <text class="desc-text">{{$item.value}}</text>
  </list-item>
</list>
```


```
/* xxx.css */
.desc-text {
  width: 683.3px;
  font-size: 35.4px;
}
```


```
// xxx.js
export default {
  data: {
    textList:  [{value: 'JS FA'}],
  },
}
```

To shorten the sample code, the list contains only one &lt;list-item&gt; component that holds only one &lt;text&gt; component. In practice, a &lt;list&gt; has multiple &lt;list-item&gt; components, and a &lt;list-item&gt; has multiple child components.


## &lt;Tabs&gt;

If your page needs to be dynamically loaded, use the &lt;tabs&gt; component. This component supports the change event, which is triggered after tab switching. A &lt;tabs&gt; component can hold only one &lt;tab-bar&gt; and one &lt;tab-content&gt;. The following is an example:


```
<!-- xxx.hml -->
<tabs>
  <tab-bar>
    <text>Home</text>
    <text>Index</text>
    <text>Detail</text>
  </tab-bar>
  <tab-content>
    <image src="{{homeImage}}"></image>
    <image src="{{indexImage}}"></image>
    <image src="{{detailImage}}"></image>
  </tab-content>
</tabs>
```


```
// xxx.js
export default {
  data: {
    homeImage: '/common/home.png',
    indexImage: '/common/index.png',
    detailImage: '/common/detail.png',
  },
}
```

The &lt;tab-content&gt; component is used to display the tab content, which vertically fills the remaining space of the &lt;tabs&gt; component by default.