harmony 鸿蒙Radio

2022-08-09
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Radio

The <Radio> component allows users to select from a set of mutually exclusive options.

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

Radio(options: {value: string, group: string})

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

Parameters

Name	Type	Mandatory	Description
value	string	Yes	Value of the current radio button.
group	string	Yes	Name of the group to which the radio button belongs. Only one radio button in a given group can be selected at a time.

Attributes

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

Name	Type	Description
checked	boolean	Whether the radio button 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.
radioStyle¹⁰⁺	RadioStyle	Style of the radio button in selected or deselected state. Since API version 10, this API is supported in ArkTS widgets.

Events

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

Name	Description
onChange(callback: (isChecked: boolean) => void)	Triggered when the selected state of the radio button changes. - If isChecked is true, it indicates that the radio button changes from unselected to selected. - If isChecked is false, it indicates that the radio button changes from selected to unselected. Since API version 9, this API is supported in ArkTS widgets.

RadioStyle

Name	Type	Mandatory	Default Value	Description
checkedBackgroundColor	ResourceColor	No	#007DFF	Color of the background when the radio button is selected.
uncheckedBorderColor	ResourceColor	No	#182431	Color of the border when the radio button is deselected.
indicatorColor	ResourceColor	No	#FFFFFF	Color of the indicator when the radio button is selected.

Example

// xxx.ets
@Entry
@Component
struct RadioExample {
  build() {
    Flex({ direction: FlexDirection.Row, justifyContent: FlexAlign.Center, alignItems: ItemAlign.Center }) {
      Column() {
        Text('Radio1')
        Radio({ value: 'Radio1', group: 'radioGroup' }).checked(true)
          .radioStyle({
            checkedBackgroundColor: Color.Pink
          })
          .height(50)
          .width(50)
          .onChange((isChecked: boolean) => {
            console.log('Radio1 status is ' + isChecked)
          })
      }
      Column() {
        Text('Radio2')
        Radio({ value: 'Radio2', group: 'radioGroup' }).checked(false)
          .radioStyle({
            checkedBackgroundColor: Color.Pink
          })
          .height(50)
          .width(50)
          .onChange((isChecked: boolean) => {
            console.log('Radio2 status is ' + isChecked)
          })
      }
      Column() {
        Text('Radio3')
        Radio({ value: 'Radio3', group: 'radioGroup' }).checked(false)
          .radioStyle({
            checkedBackgroundColor: Color.Pink
          })
          .height(50)
          .width(50)
          .onChange((isChecked: boolean) => {
            console.log('Radio3 status is ' + isChecked)
          })
      }
    }.padding({ top: 30 })
  }
}

radio