harmony 鸿蒙list-item-group

2022-08-09
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list-item-group

NOTE

This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

<list-item-group> is a child component of <list> and is used to group items in a list. By default, the width of <list-item-group> is equal to that of <list>.

To use this component, you must set the columns attribute of the parent component <list> to 1. Otherwise, this component is not displayed.
You can customize the width of each <list-item-group>. However, if you retain the default value stretch of align-items for the parent component <list>, the width of <list-item-group> is equal to that of <list>. To make the customized <list-item-group> width take effect, set align-items to other values rather than stretch.

Required Permissions

None

Child Components

Only the <list-item> child component is supported.

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Default Value	Mandatory	Description
type	string	default	No	Type of the list-item-group. A list supports multiple list-item-group types. The same type of list-item-groups must have the same view layout after being rendered. If the type is fixed, replace the if attribute with the show attribute to ensure that the view layout remains unchanged.

NOTE

The universal attribute id is used to identify a group. The input parameters of related functions and event information in the list also use id to uniquely identify a group.

Styles

In addition to the universal styles, the following styles are supported.

Name	Type	Default Value	Mandatory	Description
flex-direction	string	row	No	Main axis direction of the flex container, which defines how items are placed in the container. Available values are as follows: - column: Items are placed vertically from top to bottom. - row: Items are placed horizontally from left to right.
justify-content	string	flex-start	No	How items are aligned along the main axis of the flex container. Available values are as follows: - flex-start: Items are packed toward the start edge of the container along the main axis. - flex-end: Items are packed toward the end edge of the container along the main axis. - center: Items are packed toward the center of the container along the main axis. - space-between: Items are positioned with space between the rows. - space-around: Items are positioned with space before, between, and after the rows. - space-evenly⁵⁺: Items are distributed within the container along the main axis, with even space between each two.

Events

In addition to the universal events, the following events are supported.

Name	Parameter	Description
groupclick	{ groupid: string }	Triggered when a group is clicked. groupid: ID of the group that is clicked.
groupcollapse	{ groupid: string }	Triggered when a group is collapsed. groupid: ID of the group collapsed. If the parameter is not carried or groupid is left empty, all groups are collapsed.
groupexpand	{ groupid: string }	Triggered when a group is expanded. groupid: ID of the group expanded. If the parameter is not carried or groupid is left empty, all groups are expanded.

Methods

The universal methods are supported.

Example

<!-- xxx.hml -->
<div class="doc-page">
  <list style="width: 100%;" id="mylist">
    <list-item class="top-list-item" clickeffect="false">
      <div class="item-div">
        <div class="item-child">
          <button type="capsule" value="Collapse first" onclick="collapseOne"></button>
          <button type="capsule" value="Expand first" onclick="expandOne"></button>
        </div>
        <div class="item-child">
          <button type="capsule" value="Collapse all" onclick="collapseAll"></button>
          <button type="capsule" value="Expand all" onclick="expandAll"></button>
        </div>
      </div>
    </list-item>
    <list-item-group for="listgroup in list" id="{{listgroup.value}}" ongroupcollapse="collapse" ongroupexpand="expand">
      <list-item type="item" style="background-color:#FFF0F5;height:95px;">
        <div class="item-group-child">
          <text>One---{{listgroup.value}}</text>
        </div>
      </list-item>
      <list-item type="item" style="background-color: #87CEFA;height:145px;" primary="true">
        <div class="item-group-child">
          <text>Primary---{{listgroup.value}}</text>
        </div>
      </list-item>
    </list-item-group>
  </list>
</div>

/* xxx.css */
.doc-page {
  flex-direction: column;
}
.top-list-item {
  width:100%;
  background-color:#D4F2E7;
}
.item-div {
  flex-direction:column;
  align-items:center;
  justify-content:space-around;
  height:240px;
}
.item-child {
  width:100%;
  height:60px;
  justify-content:space-around;
  align-items:center;
}
.item-group-child {
  justify-content: center;
  align-items: center;
  width:100%;
}

// xxx.js
import promptAction from '@ohos.promptAction';
export default {
    data: {
        direction: 'column',
        list: [],
        listAdd: []
    },
    onInit() {
        this.list = []
        this.listAdd = []
        for (var i = 1; i <= 3; i++) {
            var dataItem = {
                value: 'GROUP' + i,
            };
            this.list.push(dataItem);
        }
    },
    collapseOne(e) {
        this.$element('mylist').collapseGroup({
            groupid: 'GROUP1'
        })
    },
    expandOne(e) {
        this.$element('mylist').expandGroup({
            groupid: 'GROUP1'
        })
    },
    collapseAll(e) {
        this.$element('mylist').collapseGroup({
            groupid: ''
        })
    },
    expandAll(e) {
        this.$element('mylist').expandGroup({
            groupid: ''
        })
    },
    collapse(e) {
        promptAction.showToast({
            message: 'Close ' + e.groupid
        })
    },
    expand(e) {
        promptAction.showToast({
            message: 'Open ' + e.groupid
        })
    }
}

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