iBest-UI@HarmonyOS

Appearance

Cascader 级联选择器 ​

介绍 ​

级联选择框，用于多层级数据的选择，典型场景为省市区选择。

引入 ​

ts
import { IBestCascader, IBestCascaderOption } from "@ibestservices/ibest-ui";

代码演示 ​

基础用法 ​

基础用法

点我查看代码
ts
import { IBestCell } from "@ibestservices/ibest-ui";
@Entry
@Component
struct DemoPage {
  @State visible: boolean = false
  @State fieldValue: string = '请选择地区'
	@State selectValue: string[] = []
  @State data: IBestCascaderOption[] = [
    {
      text: "江苏省",
      value: "320000",
      children: [
        {
          text: "南京市",
          value: "320100",
          children: [
            {
              text: "秦淮区",
              value: "320104"
            },
            {
              text: "雨花台区",
              value: "320114"
            }
          ]
        },
        {
          text: "苏州市",
          value: "320500",
          children: [
            {
              text: "姑苏区",
              value: "320508"
            },
            {
              text: "昆山市",
              value: "320583"
            }
          ]
        }
      ]
    },
    {
      text: "安徽省",
      value: "340000",
      children: [
        {
          text: "合肥市",
          value: "340100",
          children: [
            {
              text: "蜀山区",
              value: "340104"
            },
            {
              text: "合肥高新技术产业开发区",
              value: "340171"
            }
          ]
        },
        {
          text: "黄山市",
          value: "341000",
          children: [
            {
              text: "屯溪区",
              value: "341002"
            },
            {
              text: "黄山区",
              value: "341003"
            }
          ]
        }
      ]
    }
  ]
  build() {
    Column(){
      IBestCell({
        title: '地区',
        value: this.value,
        isLink: true,
        onClickCell: () => {
          this.visible = true
        }
      })
      IBestCascader({
        visible: $visible,
        options: this.data,
        value: $selectValue,
        itemHeight: 100,
        onConfirm: (value: IBestCascaderOption[]) => {
          this.fieldValue = value.map(item => item.text).join(',')
        }
      })
    }
  }
}

自定义选中颜色 ​

自定义选中颜色

点我查看代码
ts
import { IBestCell } from "@ibestservices/ibest-ui";
@Entry
@Component
struct DemoPage {
  @State visible: boolean = false
  @State fieldValue: string = '江苏省,南京市,雨花台区'
	@State selectValue: string[] = ["320000", "320100", "320114"]
  @State data: IBestCascaderOption[] = [
    {
      text: "江苏省",
      value: "320000",
      children: [
        {
          text: "南京市",
          value: "320100",
          children: [
            {
              text: "秦淮区",
              value: "320104"
            },
            {
              text: "雨花台区",
              value: "320114"
            }
          ]
        },
        {
          text: "苏州市",
          value: "320500",
          children: [
            {
              text: "姑苏区",
              value: "320508"
            },
            {
              text: "昆山市",
              value: "320583"
            }
          ]
        }
      ]
    },
    {
      text: "安徽省",
      value: "340000",
      children: [
        {
          text: "合肥市",
          value: "340100",
          children: [
            {
              text: "蜀山区",
              value: "340104"
            },
            {
              text: "合肥高新技术产业开发区",
              value: "340171"
            }
          ]
        },
        {
          text: "黄山市",
          value: "341000",
          children: [
            {
              text: "屯溪区",
              value: "341002"
            },
            {
              text: "黄山区",
              value: "341003"
            }
          ]
        }
      ]
    }
  ]
  build() {
    Column(){
      IBestCell({
        title: '地区',
        value: this.value,
        isLink: true,
        hasBorder: false,
        onClickCell: () => {
          this.visible = true
        }
      })
      IBestCascader({
        visible: $visible,
        options: this.data,
        value: $selectValue,
        activeColor: '#ee0a24',
        onConfirm: (value: IBestCascaderOption[]) => {
          this.fieldValue = value.map(item => item.text).join(',')
        }
      })
    }
  }
}

异步加载选项 ​

异步加载选项

TIP

通过 lazy 属性可开启异步加载, 通过传入 lazyLoad 函数可实现获取异步数据, 共三个参数:

• value 为当前点击的选项值。
• level 为下一个选项的层级, 默认从0开始。
• cb 为接收异步请求结果的回调函数。

点我查看代码
ts
@Entry
@Component
struct DemoPage {
  @State visible: boolean = false
  @State fieldValue: string = '请选择地区'
	@State selectValue: string[] = []
  @State data: IBestCascaderOption[] = [
    {
      text: "江苏省",
      value: "320000"
    },
    {
      text: "安徽省",
      value: "340000"
    }
  ]
  // 定义异步加载函数
  lazyLoad(value: string | number, level: number, cb: (arr: IBestCascaderOption[]) => void){
		IBestToast.show({
			type: "loading"
		})
		setTimeout(() => {
			IBestToast.hide()
			cb(value == "320000" ? [
				{
				text: "南京市",
				value: "320100",
				isEnd: level >= 1
			},
			{
				text: "苏州市",
				value: "320500",
				isEnd: level >= 1
			}
			] : [
				{
					text: "合肥市",
					value: "340100",
					isEnd: level >= 1
				},
				{
					text: "黄山市",
					value: "341000",
					isEnd: level >= 1
				}
			])
		}, 2000)
	}
  build() {
    Column(){
      IBestCell({
        title: '地区',
        value: this.value,
        isLink: true,
        onClickCell: () => {
          this.visible = true
        }
      })
      IBestCascader({
        visible: $visible,
        options: this.data,
        value: $selectValue,
        lazy: true,
        lazyLoad: this.lazyLoad,
        onConfirm: (value: IBestCascaderOption[]) => {
          this.fieldValue = value.map(item => item.text).join(',')
        }
      })
    }
  }
}

禁用选项 ​

禁用选项

TIP

通过 disabled 属性禁用选项。

点我查看代码
ts
@Entry
@Component
struct DemoPage {
  @State visible: boolean = false
  @State fieldValue: string = '请选择地区'
  @State selectValue: string[] = []
  @State data: IBestCascaderOption[] = [
		{
			text: "江苏省",
			value: "320000",
			children: [
				{
					text: "南京市",
					value: "320100",
					children: [
						{
							text: "秦淮区",
							value: "320104"
						},
						{
							text: "雨花台区",
							value: "320114"
						}
					]
				},
				{
					text: "苏州市",
					value: "320500",
					disabled: true,
					children: [
						{
							text: "姑苏区",
							value: "320508"
						},
						{
							text: "昆山市",
							value: "320583"
						}
					]
				}
			]
		},
		{
			text: "安徽省",
			value: "340000",
			children: [
				{
					text: "合肥市",
					value: "340100",
					children: [
						{
							text: "蜀山区",
							value: "340104"
						},
						{
							text: "合肥高新技术产业开发区",
							value: "340171"
						}
					]
				},
				{
					text: "黄山市",
					value: "341000",
					disabled: true,
					children: [
						{
							text: "屯溪区",
							value: "341002"
						},
						{
							text: "黄山区",
							value: "341003"
						}
					]
				}
			]
		}
	]
  build() {
    Column(){
      IBestCell({
        title: '地区',
        value: this.value,
        isLink: true,
        onClickCell: () => {
          this.visible = true
        }
      })
      IBestCascader({
        visible: $visible,
        options: this.data,
        value: $selectValue,
        onConfirm: (value: IBestCascaderOption[]) => {
          this.fieldValue = value.map(item => item.text).join(',')
        }
      })
    }
  }
}

API ​

@Props ​

参数说明类型默认值
visible控制弹出层显隐显隐booleanfalse
value选中选项值, 支持双向绑定Array[string | number][]
title弹出层标题string请选择
options可选项数据源Array[IBestCascaderOption][]
activeColor选中项颜色string#3D8AF2
itemHeight单个选项高度,单位lpxnumber80
lazy是否开启动态加载booleanfalse
lazyLoad异步加载函数,value 为当前点击的选项值, level 为下一个选项的层级, 默认从0开始, cb 为接收结果的回调函数(value: string | number, level: number, cb: (arr: IBestCascaderOption[]) => void) => voidnull

IBestCascaderOption 数据结构 ​

参数说明类型默认值
text选项文字(必填)string''
value选项对应的值(必填)string | number''
isEnd是否是结束选项booleanfalse
disabled是否禁用单项booleanfalse
children子选项列表Array[IBestCascaderOption][]

Events ​

事件名说明回调参数
onChange选择单项后触发value: string | number, selectedOptions: IBestCascaderOption[], index: number
onConfirm全部选择完毕后触发value: IBestCascaderOption[]