harmony 鸿蒙Checkbox

2022-08-09
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Checkbox

The <Checkbox> component is used to enable or disable an option.

NOTE

This component is supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Not supported

APIs

Checkbox(options?: {name?: string, group?: string })

Since API version 9, this API is supported in ArkTS widgets.

Parameters

Name	Type	Mandatory	Description
name	string	No	Name of the check box.
group	string	No	Group name of the check box. NOTE If not used with the <CheckboxGroup> component, this parameter is invalid.

Attributes

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

Name	Type	Description
select	boolean	Whether the check box is selected. Default value: false Since API version 9, this API is supported in ArkTS widgets. Since API version 10, this attribute supports $$ for two-way binding of variables.
selectedColor	ResourceColor	Color of the check box when it is selected. Since API version 9, this API is supported in ArkTS widgets.
unselectedColor¹⁰⁺	ResourceColor	Border color of the check box when it is not selected.
mark¹⁰⁺	MarkStyle	Internal icon style of the check box.

Events

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

Name	Description
onChange(callback: (value: boolean) => void)	Triggered when the selected status of the check box changes. - The value true means that the check box is selected. - The value false means that the check box is not selected. Since API version 9, this API is supported in ArkTS widgets.

MarkStyle¹⁰⁺

Name	Type	Mandatory	Default Value	Description
strokeColor	ResourceColor	No	Color.White	Color of the internal mark.
size	number \|string	No	-	Size of the internal mark, in vp. The default size is the same as the width of the check box. This parameter cannot be set in percentage. If it is set to an invalid value, the default value is used.
strokeWidth	number \|string	No	2	Stroke width of the internal mark, in vp. This parameter cannot be set in percentage. If it is set to an invalid value, the default value is used.

Example

Example 1

// xxx.ets
@Entry
@Component
struct CheckboxExample {

  build() {
    Row() {
      Checkbox({name: 'checkbox1',  group: 'checkboxGroup'})
        .select(true)
        .selectedColor(0xed6f21)
        .onChange((value: boolean) => {
          console.info('Checkbox1 change is'+ value)
        })
      Checkbox({name: 'checkbox2',  group: 'checkboxGroup'})
        .select(false)
        .selectedColor(0x39a2db)
        .onChange((value: boolean) => {
          console.info('Checkbox2 change is'+ value)
        })
    }
  }
}

Example 2

// xxx.ets
@Entry
@Component
struct Index {

  build() {
    Row() {
      Column() {
        Flex({ justifyContent: FlexAlign.Center, alignItems: ItemAlign.Center }) {
          Checkbox({ name: 'checkbox1', group: 'checkboxGroup' })
            .selectedColor(0x39a2db)
            .onChange((value: boolean) => {
              console.info('Checkbox1 change is'+ value)
            })
            .mark({
              strokeColor:Color.Black,
              size: 50,
              strokeWidth: 5
            })
            .unselectedColor(Color.Red)
            .width(30)
            .height(30)
          Text('Checkbox1').fontSize(20)
        }
        Flex({ justifyContent: FlexAlign.Center, alignItems: ItemAlign.Center }) {
          Checkbox({ name: 'checkbox2', group: 'checkboxGroup' })
            .selectedColor(0x39a2db)
            .onChange((value: boolean) => {
              console.info('Checkbox2 change is' + value)
            })
            .width(30)
            .height(30)
          Text('Checkbox2').fontSize(20)
        }
      }
      .width('100%')
    }
    .height('100%')
  }
}