harmony 鸿蒙Rating

2022-08-09
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Rating

The <Rating> component provides a rating bar.

NOTE

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

Child Components

Not supported

APIs

Rating(options?: { rating: number, indicator?: boolean })

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

Parameters

Name	Type	Mandatory	Description
rating	number	Yes	Value to rate. Default value: 0 Value range: [0, stars] A value less than 0 evaluates to the value 0. A value greater than the value of stars evaluates to the value of stars. Since API version 10, this parameter supports $$ for two-way binding of variables.
indicator	boolean	No	Whether the component is used only as an indicator and cannot be operated. Default value: false NOTE When indicator is set to true, the default component height is 12.0 vp, and the component width is calculated as follows: Height x Value of stars. When indicator is set to false, the default component height is 28.0 vp, and the component width is calculated as follows: Height x Value of stars.

Attributes

Name	Type	Description
stars	number	Total number of ratings. Default value: 5 Since API version 9, this API is supported in ArkTS widgets. NOTE A value less than or equal to 0 evaluates to the default value.
stepSize	number	Step of an operation. Default value: 0.5 Since API version 9, this API is supported in ArkTS widgets. NOTE A value less than 0.1 evaluates to the default value. Value range: [0.1, stars]
starStyle	{ backgroundUri: string, foregroundUri: string, secondaryUri?: string }	Star style. backgroundUri: image path for the unselected star. You can use the default system image or a custom image. foregroundUri: image path for the selected star. You can use the default system image or a custom image. secondaryUri: image path for the partially selected star. You can use the default system image or a custom image. Since API version 9, this API is supported in ArkTS widgets. NOTE For details about the image types supported by the startStyle attribute, see Image. Local and online images are supported, but not PixelMap and Resource objects. By default, the image is loaded in asynchronous mode. Synchronous loading is not supported. If this parameter is set to undefined or an empty string, the <Rating> component loads the default star image source.

NOTE

The drawing area of each rating image is [width/stars, height], wherein width and height indicate the width and height of the <Rating> component, respectively.

To specify the drawing area as a square, you are advised to customize the width and height in this format: [height * stars, height], width = height * stars.

Events

Name	Description
onChange(callback:(value: number) => void)	Triggered when the rating value changes. Since API version 9, this API is supported in ArkTS widgets.

Example

Example 1

// xxx.ets
@Entry
@Component
struct RatingExample {
  @State rating: number = 3.5

  build() {
    Column() {
      Column() {
        Rating({ rating: this.rating, indicator: false })
          .stars(5)
          .stepSize(0.5)
          .margin({ top: 24 })
          .onChange((value: number) => {
            this.rating = value
          })
        Text('current score is ' + this.rating)
          .fontSize(16)
          .fontColor('rgba(24,36,49,0.60)')
          .margin({ top: 16 })
      }.width(360).height(113).backgroundColor('#FFFFFF').margin({ top: 68 })

      Row() {
        Image('common/testImage.jpg')
          .width(40)
          .height(40)
          .borderRadius(20)
          .margin({ left: 24 })
        Column() {
          Text('Yue')
            .fontSize(16)
            .fontColor('#182431')
            .fontWeight(500)
          Row() {
            Rating({ rating: 3.5, indicator: false }).margin({ top: 1, right: 8 })
            Text('2021/06/02')
              .fontSize(10)
              .fontColor('#182431')
          }
        }.margin({ left: 12 }).alignItems(HorizontalAlign.Start)

        Text('1st Floor')
          .fontSize(10)
          .fontColor('#182431')
          .position({ x: 295, y: 8 })
      }.width(360).height(56).backgroundColor('#FFFFFF').margin({ top: 64 })
    }.width('100%').height('100%').backgroundColor('#F1F3F5')
  }
}

rating

Example 2

// xxx.ets
@Entry
@Component
struct RatingExample {
  @State rating: number = 3.5

  build() {
    Column() {
      Rating({ rating: this.rating, indicator: false })
        .stars(5)
        .stepSize(0.5)
        .starStyle({
          backgroundUri: '/common/imag1.png', // The common folder is at the same level as pages.
          foregroundUri: '/common/imag2.png',
          secondaryUri: '/common/imag3.png'
        })
        .margin({ top: 24 })
        .onChange((value: number) => {
          this.rating = value
        })
      Text('current score is ' + this.rating)
        .fontSize(16)
        .fontColor('rgba(24,36,49,0.60)')
        .margin({ top: 16 })
    }.width('100%').height('100%').backgroundColor('#F1F3F5')
  }
}

rating1