harmony 鸿蒙Select

2022-08-09
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Select

The component provides a drop-down list box that allows users to select among multiple 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

Select(options: Array<SelectOption>)

SelectOption

Name	Type	Mandatory	Description
value	ResourceStr	Yes	Value of an option in the drop-down list box.
icon	ResourceStr	No	Icon of an option in the drop-down list box.

Attributes

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

Name	Type	Description
selected	number	Index of the initial selected option in the drop-down list box. The index of the first option is 0. If this attribute is not set, the default value -1 will be used, indicating that no option is selected. If this attribute is set to undefined or null, the first option is selected. Since API version 10, this attribute supports $$ for two-way binding of variables.
value	string	Text of the drop-down button. By default, it will be replaced by the content of the selected option. Since API version 10, this attribute supports $$ for two-way binding of variables.
font	Font	Text font of the drop-down button. Default value: { size: ‘16fp’, weight: FontWeight.Medium }
fontColor	ResourceColor	Text color of the drop-down button. Default value: ‘#E6FFFFFF’
selectedOptionBgColor	ResourceColor	Background color of the selected option in the drop-down list box. Default value: ‘#33007DFF’
selectedOptionFont	Font	Text font of the selected option in the drop-down list box. Default value: { size: ‘16fp’, weight: FontWeight.Regular }
selectedOptionFontColor	ResourceColor	Text color of the selected option in the drop-down list box. Default value: ‘#ff007dff’
optionBgColor	ResourceColor	Background color of an option in the drop-down list box. Default value: ‘#ffffffff’
optionFont	Font	Text font of an option in the drop-down list box. Default value: { size: ‘16fp’, weight: FontWeight.Regular }
optionFontColor	ResourceColor	Text color of an option in the drop-down list box. Default value: ‘#ff182431’
space¹⁰⁺	Length	Spacing between the text and arrow of an option. NOTE This attribute cannot be set in percentage.
arrowPosition¹⁰⁺	ArrowPosition	Alignment between the text and arrow of an option. Default value: ArrowPosition.END
menuAlign¹⁰⁺	alignType: MenuAlignType, offset?: Offset	Alignment between the drop-down button and the drop-down menu. - alignType: alignment type. Mandatory. - offset: offset of the drop-down menu relative to the drop-down button after alignment based on the specified alignment type. Default value: {dx: 0, dy: 0}

ArrowPosition¹⁰⁺

Name	Description
END¹⁰⁺	The text is in front of the arrow.
START¹⁰⁺	The arrow is in front of the text.

MenuAlignType¹⁰⁺

Name	Description
START	Aligned with the start edge in the same direction as the language in use.
CENTER	Aligned with the center.
END	Aligned with the end edge in the same direction as the language in use.

Events

Name	Description
onSelect(callback: (index: number, value?: string) => void)	Invoked when an option in the drop-down list box is selected. index: index of the selected option. value: value of the selected option.

Example

// xxx.ets
@Entry
@Component
struct SelectExample {
  @State text: string = "TTTTT"
  @State index: number = 2
  @State space: number = 8
  @State arrowPosition: ArrowPosition = ArrowPosition.END
  build() {
    Column() {
      Select([{ value: 'aaa', icon: "/common/public_icon.svg" },
        { value: 'bbb', icon: "/common/public_icon.svg" },
        { value: 'ccc', icon: "/common/public_icon.svg" },
        { value: 'ddd', icon: "/common/public_icon.svg" }])
        .selected(this.index)
        .value(this.text)
        .font({ size: 16, weight: 500 })
        .fontColor('#182431')
        .selectedOptionFont({ size: 16, weight: 400 })
        .optionFont({ size: 16, weight: 400 })
        .space(this.space)
        .arrowPosition(this.arrowPosition)
        .menuAlign(MenuAlignType.START, {dx:0, dy:0})
        .onSelect((index:number, text?: string|undefined)=>{
          console.info('Select:' + index)
          this.index = index;
          if(text){
            this.text = text;
          }
        })
    }.width('100%')
  }
}