harmony 鸿蒙Counter

2022-08-09
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Counter

The <Counter> component provides an operation to increase or decrease the number.

NOTE

This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Supported

APIs

Counter()

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

Attributes

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

Name	Type	Description
enableInc¹⁰⁺	boolean	Whether the plus button is enabled. Default value: true
enableDec¹⁰⁺	boolean	Whether the minus button is enabled. Default value: true

Events

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

Name	Description
onInc(event: () => void)	Invoked when the number of monitored objects is increased. Since API version 9, this API is supported in ArkTS widgets.
onDec(event: () => void)	Invoked when the number of monitored objects is decreased. Since API version 9, this API is supported in ArkTS widgets.

Example

// xxx.ets
@Entry
@Component
struct CounterExample {
  @State value: number = 0

  build() {
    Column() {
      Counter() {
        Text(this.value.toString())
      }.margin(100)
      .onInc(() => {
        this.value++
      })
      .onDec(() => {
        this.value--
      })
    }.width("100%")
  }
}

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