焦点事件


焦点事件

icon-note.gif 说明: 从API Version 8开始支持。后续版本如有新增内容,则采用上角标单独标记该内容的起始版本。

权限列表

事件

名称 支持冒泡 功能描述
onFocus(callback: () => void) 当前组件获取焦点时触发的回调。
onBlur(callback:() => void) 当前组件失去焦点时触发的回调。

icon-note.gif 说明: 支持焦点事件的组件:Button、Text、Image、List、Grid。

示例

@Entry
@Component
struct FocusEventExample {
  @State textOne: string = ''
  @State textTwo: string = ''
  @State textThree: string = ''
  @State oneButtonColor: string = '#FF0000'
  @State twoButtonColor: string = '#87CEFA'
  @State threeButtonColor: string = '#90EE90'

  build() {
    Column({ space:20 }){
      Button(this.textOne)
        .backgroundColor(this.oneButtonColor)
        .width(260).height(70).fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.textOne = 'First Button onFocus'
          this.oneButtonColor = '#AFEEEE'
        })
        .onBlur(() => {
          this.textOne = 'First Button onBlur'
          this.oneButtonColor = '#FFC0CB'
        })
      Button(this.textTwo)
        .backgroundColor(this.twoButtonColor)
        .width(260).height(70).fontColor(Color.Black)
        .focusable(true)
      Button(this.textThree)
        .backgroundColor(this.threeButtonColor)
        .width(260).height(70).fontColor(Color.Black)
        .focusable(true)
        .onFocus(() => {
          this.textThree = 'Third Button onFocus'
          this.threeButtonColor = '#AFEEEE'
        })
        .onBlur(() => {
          this.textThree = 'Third Button onBlur'
          this.threeButtonColor = '#FFC0CB'
        })
    }.width('100%').margin({ top:20 })
  }
}
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