系列鸿蒙 HarmonyOS 6.1 新特性实战 · 第 38 篇Select下拉选择器和 TextPicker滚筒选择器是两种互补的选择组件Select 适合选项多、界面紧凑的场景TextPicker 适合连续值或较少选项的滚动选择。本篇还演示了用两个 Select 联动实现省市级联的实用模式。运行效果初始状态展示 Select 下拉和 TextPicker 滚筒点击城市 Select 展开下拉列表一、Select 下拉选择器private cities: SelectOption[] [ { value: 北京 }, { value: 上海 }, { value: 广州 }, { value: 深圳 }, { value: 成都 }, { value: 杭州 } ] State selectedCity: number 0 Select(this.cities) .selected(this.selectedCity) .value(this.cities[this.selectedCity].value as string) // 显示当前选中项 .font({ size: 15 }) .fontColor(#333) .selectedOptionBgColor(#e8f0ff) // 已选项背景色 .selectedOptionFontColor(#0066ff) // 已选项文字色 .onSelect((idx: number) { this.selectedCity idx })注意属性名是selectedOptionBgColor不是selectedOptionBackgroundColorselectedOptionFontColor也没有驼峰缩写问题但实测optionBgColor不存在可以在 DevEco 中.触发自动补全确认可用属性。二、TextPicker 滚筒选择器private hours: string[] [00, 06, 08, 09, 10, 12, 14, 16, 18, 20, 22, 23] State timePickerIdx: number 1 State textPickerVal: string TextPicker({ range: this.hours, selected: this.timePickerIdx }) .onChange((val: string | string[], idx: number | number[]) { if (typeof val string) { this.textPickerVal val this.timePickerIdx typeof idx number ? idx : 0 } }) Text(选中时刻 (this.textPickerVal.length 0 ? this.textPickerVal : this.hours[this.timePickerIdx]) :00) .fontSize(16).fontColor(#0066ff).fontWeight(FontWeight.Bold)回调类型注意onChange的参数类型是string | string[]联合类型单列选择时是string需要类型判断后使用。三、省市联动Select 级联用两个 Select 联动实现省市两级选择private provinces: string[] [广东省, 浙江省, 四川省] private provinceCities: string[][] [ [广州市, 深圳市, 佛山市, 东莞市], [杭州市, 宁波市, 温州市], [成都市, 绵阳市, 德阳市] ] State cascadeProvince: number 0 State cascadeCity: number 0 Row({ space: 8 }) { // 省份 Select Select(this.provinces.map((p: string): SelectOption ({ value: p }))) .selected(this.cascadeProvince) .value(this.provinces[this.cascadeProvince]) .font({ size: 14 }).layoutWeight(1) .onSelect((idx: number) { this.cascadeProvince idx this.cascadeCity 0 // 切换省份时重置城市 }) // 城市 Select根据省份动态变化 Select(this.provinceCities[this.cascadeProvince].map((c: string): SelectOption ({ value: c }))) .selected(this.cascadeCity) .value(this.provinceCities[this.cascadeProvince][this.cascadeCity]) .font({ size: 14 }).layoutWeight(1) .onSelect((idx: number) { this.cascadeCity idx }) }关键点城市 Select 的数据源this.provinceCities[this.cascadeProvince]是响应式的省份变化时自动更新城市列表。完整代码Entry Component struct Index { State selectedCity: number 0 State selectedFruit: number 0 State textPickerVal: string State timePickerIdx: number 1 State cascadeProvince: number 0 State cascadeCity: number 0 private cities: SelectOption[] [ { value: 北京 }, { value: 上海 }, { value: 广州 }, { value: 深圳 }, { value: 成都 }, { value: 杭州 } ] private fruits: SelectOption[] [ { value: 苹果 }, { value: 香蕉 }, { value: 橙子 }, { value: 葡萄 }, { value: 草莓 } ] private hours: string[] [00, 06, 08, 09, 10, 12, 14, 16, 18, 20, 22, 23] private provinces: string[] [广东省, 浙江省, 四川省] private provinceCities: string[][] [ [广州市, 深圳市, 佛山市, 东莞市], [杭州市, 宁波市, 温州市], [成都市, 绵阳市, 德阳市] ] build() { Scroll() { Column({ space: 20 }) { Text(Select 与 TextPicker 选择器) .fontSize(22).fontWeight(FontWeight.Bold).fontColor(#1a1a1a) // Select Column({ space: 10 }) { Text(一、Select 下拉选择器).fontSize(15).fontWeight(FontWeight.Bold).fontColor(#333) Row({ space: 12 }) { Text(城市).fontSize(14).fontColor(#555).width(50) Select(this.cities) .selected(this.selectedCity) .value(this.cities[this.selectedCity].value as string) .font({ size: 15 }).fontColor(#333) .selectedOptionBgColor(#e8f0ff).selectedOptionFontColor(#0066ff) .onSelect((idx: number) { this.selectedCity idx }) .layoutWeight(1) } .width(100%).alignItems(VerticalAlign.Center) Text(已选${this.cities[this.selectedCity].value}) .fontSize(14).fontColor(#0066ff).fontWeight(FontWeight.Bold) } .padding(12).backgroundColor(#fff).borderRadius(8).width(100%) .border({ width: 1, color: #e0e0e0 }).alignItems(HorizontalAlign.Start) // TextPicker Column({ space: 10 }) { Text(二、TextPicker 滚筒选择器).fontSize(15).fontWeight(FontWeight.Bold).fontColor(#333) TextPicker({ range: this.hours, selected: this.timePickerIdx }) .onChange((val: string | string[], idx: number | number[]) { if (typeof val string) { this.textPickerVal val this.timePickerIdx typeof idx number ? idx : 0 } }) Text(选中时刻 (this.textPickerVal.length 0 ? this.textPickerVal : this.hours[this.timePickerIdx]) :00) .fontSize(16).fontColor(#0066ff).fontWeight(FontWeight.Bold) } .padding(12).backgroundColor(#fff).borderRadius(8).width(100%) .border({ width: 1, color: #e0e0e0 }).alignItems(HorizontalAlign.Start) // 省市联动 Column({ space: 10 }) { Text(三、省市联动Select 级联).fontSize(15).fontWeight(FontWeight.Bold).fontColor(#333) Row({ space: 8 }) { Select(this.provinces.map((p: string): SelectOption ({ value: p }))) .selected(this.cascadeProvince).value(this.provinces[this.cascadeProvince]) .font({ size: 14 }).layoutWeight(1) .onSelect((idx: number) { this.cascadeProvince idx; this.cascadeCity 0 }) Select(this.provinceCities[this.cascadeProvince].map((c: string): SelectOption ({ value: c }))) .selected(this.cascadeCity) .value(this.provinceCities[this.cascadeProvince][this.cascadeCity]) .font({ size: 14 }).layoutWeight(1) .onSelect((idx: number) { this.cascadeCity idx }) } .width(100%).alignItems(VerticalAlign.Center) Text(选中${this.provinces[this.cascadeProvince]} ${this.provinceCities[this.cascadeProvince][this.cascadeCity]}) .fontSize(14).fontColor(#0066ff).fontWeight(FontWeight.Bold) } .padding(12).backgroundColor(#fff).borderRadius(8).width(100%) .border({ width: 1, color: #e0e0e0 }).alignItems(HorizontalAlign.Start) } .padding(20).width(100%) } .width(100%).height(100%).backgroundColor(#f5f5f5) } }API 速查组件/属性说明Select(options: SelectOption[])下拉选择options 为{value: string}[].selected(idx)初始选中索引.value(显示文字)未展开时显示的文本.selectedOptionBgColor(#e8f0ff)已选项背景色.selectedOptionFontColor(#0066ff)已选项文字色.onSelect((idx: number) {})选中回调TextPicker({ range: string[], selected: idx })滚筒选择.onChange((val, idx) {})滚动变化回调val 是string | string[]小结属性名要精确selectedOptionBgColor而非selectedOptionBackgroundColor用 DevEco 自动补全确认TextPicker onChange 处理联合类型typeof val string判断后再使用级联靠响应式数据城市 Select 的 range 直接用this.provinceCities[province]省份变化自动刷新切换父级别时重置子级索引this.cascadeCity 0防止越界上一篇DatePicker / TimePicker 完全指南 | 下一篇Badge 徽标与 Chip 标签组件
