harmony 鸿蒙Adding a Container

2022-08-09
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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 <list-item> component that holds only one <text> component. In practice, a <list> has multiple <list-item> components, and a <list-item> has multiple child components.

<Tabs>

If your page needs to be dynamically loaded, use the <tabs> component. This component supports the change event, which is triggered after tab switching. A <tabs> component can hold only one <tab-bar> and one <tab-content>. 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 <tab-content> component is used to display the tab content, which vertically fills the remaining space of the <tabs> component by default.