harmony 鸿蒙TextPicker

2022-08-09
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TextPicker

The <TextPicker> component allows users to scroll to select text.

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

TextPicker(options?: {range: string[]|string[][]|Resource|TextPickerRangeContent[]|TextCascadePickerRangeContent[], selected?: number, value?: string})

Creates a text picker based on the selection range specified by range.

Parameters

Name	Type	Mandatory	Description
range	string[] \|string[][]¹⁰⁺ \|Resource \| TextPickerRangeContent[]¹⁰⁺ \|TextCascadePickerRangeContent[]¹⁰⁺	Yes	Data selection range of the picker. This parameter cannot be set to an empty array. If set to an empty array, it will not be displayed. If it is dynamically changed to an empty array, the current value remains displayed. NOTE For a single-column picker, use a value of the string[], Resource, or TextPickerRangeContent[] type. For a multi-column picker, use a value of the string[] type. For a multi-column linked picker, use a value of the TextCascadePickerRangeContent[] type. The Resource type supports only strarray.json.
selected	number \|number[]¹⁰⁺	No	Index of the default item in the range. Default value: 0 NOTE For a single-column picker, use a value of the number type. For a multi-column (linked) picker, use a value of the number[] type. Since API version 10, this parameter supports $$ for two-way binding of variables.
value	string \|string[]¹⁰⁺	No	Value of the default item in the range. The priority of this parameter is lower than that of selected. Default value: value of the first item NOTE This parameter works only when the picker contains text only. For a single-column picker, use a value of the string type. For a multi-column (linked) picker, use a value of the string[] type. Since API version 10, this parameter supports $$ for two-way binding of variables.

TextPickerRangeContent¹⁰⁺

Name	Type	Mandatory	Description
icon	string \|Resource	Yes	Image resource.
text	string \|Resource	No	Text information.

TextCascadePickerRangeContent¹⁰⁺

Name	Type	Mandatory	Description
text	string \|Resource	Yes	Text information.
children	TextCascadePickerRangeContent[]	No	Linkage data.

Attributes

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

Name	Type	Description
defaultPickerItemHeight	number \|string	Height of each item in the picker.
disappearTextStyle¹⁰⁺	PickerTextStyle	Font color, font size, and font width for the top and bottom items. Default value: { color: ‘#ff182431’, font: { size: ‘14fp’, weight: FontWeight.Regular } }
textStyle¹⁰⁺	PickerTextStyle	Font color, font size, and font width of all items except the top, bottom, and selected items. Default value: { color: ‘#ff182431’, font: { size: ‘16fp’, weight: FontWeight.Regular } }
selectedTextStyle¹⁰⁺	PickerTextStyle	Font color, font size, and font width of the selected item. Default value: { color: ‘#ff007dff’, font: { size: ‘20vp’, weight: FontWeight.Medium } }
selectedIndex¹⁰⁺	number \|number[]	Index of the default selected item in the array. Its priority is higher than that of the selected value in options. NOTE For a single-column picker, use a value of the number type. For a multi-column (linked) picker, use a value of the number[] type.
canLoop¹⁰⁺	boolean	Whether to support scroll looping. The value true means to support scroll looping, and false means the opposite. Default value: true

Events

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

Name	Description
onAccept(callback: (value: string, index: number) => void)^(deprecated)	Triggered when the OK button in the dialog box is clicked. - value: value of the selected item. - index: index of the selected item. This API is deprecated since API version 10. NOTE This event can be triggered only in the text picker dialog box.
onCancel(callback: () => void)^(deprecated)	Triggered when the Cancel button in the dialog box is clicked. This API is deprecated since API version 10. NOTE This event can be triggered only in the text picker dialog box.
onChange(callback: (value: string \|string[]¹⁰⁺, index: number \|number[]¹⁰⁺) => void)	Triggered when an item in the picker is selected. - value: value of the selected item. (For a multi-column picker, value is of the array type.) - index: index of the selected item. (For a multi-column picker, index is of the array type.) NOTE When the picker contains text only or both text and imagery, value indicates the text value of the selected item. When the picker contains imagery only, value is empty.

Example

// xxx.ets
class bottom {
  bottom:number = 50
}
let bott:bottom = new bottom()
@Entry
@Component
struct TextPickerExample {
  private select: number = 1
  private apfruits: string[] = ['apple1', 'apple2', 'apple3', 'apple4']
  private orfruits: string[] = ['orange1', 'orange2', 'orange3', 'orange4']
  private pefruits: string[] = ['peach1', 'peach2', 'peach3', 'peach4']
  private multi: string[][] = [this.apfruits, this.orfruits, this.pefruits]
  private cascade: TextCascadePickerRangeContent[] = [
    {
      text: 'Category 1',
      children: [{ text: 'China', children: [{ text: 'Beijing' }, { text: 'Shanghai' }, { text: 'Chongqing' }] },
        { text: 'Japan', children: [{ text: 'Tokyo' }, { text: 'Hokkaido' }, { text: 'Osaka' }] }]
    },
    {
      text: 'Europe',
      children: [{ text: 'Germany', children: [{ text: 'Berlin' }, { text: 'Munich' }, { text: 'Nuremberg' }] },
        { text: 'France', children: [{ text: 'Paris' }, { text: 'Lille' }, { text: 'Orleans' }] }]
    },
    {
      text: 'Africa',
      children: [{ text: 'Egypt', children: [{ text: 'Cairo' }, { text: 'Damietta' }, { text: 'Girga' }] },
        { text: 'Algeria', children: [{ text: 'Alger' }, { text: 'Oran' }, { text: 'Adrar' }] }]
    }
  ]

  build() {
    Column() {

      TextPicker({ range: this.apfruits, selected: this.select })
        .onChange((value: string|string[], index: number|number[]) => {
          console.info('Picker item changed, value: ' + value + ', index: ' + index)
        }).margin(bott)

      TextPicker({ range: this.multi })
        .onChange((value: string|string[], index: number|number[]) => {
          console.info('TextPicker multi-column: onChange' + JSON.stringify(value) + ',' + 'index:' + JSON.stringify(index))
        }).margin(bott)

      TextPicker({ range: this.cascade })
        .onChange((value: string|string[], index: number|number[]) => {
          console.info('TextPicker multi-column linkage: onChange' + JSON.stringify(value) + ',' + 'index:' + JSON.stringify(index))
        })
    }
  }
}

textpicker

// xxx.ets
@Entry
@Component
struct TextPickerExample {
  private select: number = 1
  private fruits: string[] = ['apple1', 'orange2', 'peach3', 'grape4']

  build() {
    Column() {
      TextPicker({ range: this.fruits, selected: this.select })
        .onChange((value: string|string[], index: number|number[]) => {
          console.info('Picker item changed, value: ' + value + ', index: ' + index)
        })
        .disappearTextStyle({color: Color.Red, font: {size: 15, weight: FontWeight.Lighter}})
        .textStyle({color: Color.Black, font: {size: 20, weight: FontWeight.Normal}})
        .selectedTextStyle({color: Color.Blue, font: {size: 30, weight: FontWeight.Bolder}})
    }.width('100%').height('100%')
  }
}

textpicker