【HarmonyOS】面包屑导航实现示例

import { promptAction } from '@kit.ArkUI'

class MyDataItem {
  id: number = 0
  provinceid: string = ""
  provincename: string = ""
  cityid: string = ""
  cityname: string = ""
  countyid: string = ""
  countyname: string = ""
}

// 示例数据
const transformedData: MyDataItem[] =
  [
    {
      "id": 1,
      "provinceid": "110000",
      "provincename": "北京市",
      "cityid": "110100000000",
      "cityname": "北京市",
      "countyid": "110101000000",
      "countyname": "东城区"
    },
    {
      "id": 2,
      "provinceid": "110000",
      "provincename": "北京市",
      "cityid": "110100000000",
      "cityname": "北京市",
      "countyid": "110102000000",
      "countyname": "西城区"
    },
    {
      "id": 3,
      "provinceid": "110000",
      "provincename": "北京市",
      "cityid": "110100000000",
      "cityname": "北京市",
      "countyid": "110103000000",
      "countyname": "朝阳区"
    },
    {
      "id": 4,
      "provinceid": "120000",
      "provincename": "天津市",
      "cityid": "120100000000",
      "cityname": "天津市",
      "countyid": "120101000000",
      "countyname": "和平区"
    },
    {
      "id": 5,
      "provinceid": "120000",
      "provincename": "天津市",
      "cityid": "120100000000",
      "cityname": "天津市",
      "countyid": "120102000000",
      "countyname": "河东区"
    },
    {
      "id": 6,
      "provinceid": "120000",
      "provincename": "天津市",
      "cityid": "120100000000",
      "cityname": "天津市",
      "countyid": "120103000000",
      "countyname": "河西区"
    },
    {
      "id": 7,
      "provinceid": "130000",
      "provincename": "河北省",
      "cityid": "130100000000",
      "cityname": "石家庄市",
      "countyid": "130102000000",
      "countyname": "桥西区"
    },
    {
      "id": 8,
      "provinceid": "130000",
      "provincename": "河北省",
      "cityid": "130100000000",
      "cityname": "石家庄市",
      "countyid": "130103000000",
      "countyname": "新华区"
    },
    {
      "id": 9,
      "provinceid": "130000",
      "provincename": "河北省",
      "cityid": "130100000000",
      "cityname": "石家庄市",
      "countyid": "130104000000",
      "countyname": "长安区"
    }
  ]

export class MyTabBean {
  name: string = ""
  idType: string | null = null // 'province' | 'city' | null = null
  idContent: string | null = null
  x: number = -1 //当前位置
  width: number = -1 //当前宽度



  constructor(name: string) {
    this.name = name
  }
}

@Entry
@Component
struct Page11 {
  scroller: Scroller = new Scroller()
  @State titles: MyTabBean[] = []
  scrollWidthOld: number = 0
  @State searchValue: string = "" //搜索内容
  @State errorInfo: string = "" //错误信息
  @State contentList: contentItem[] = [] //要显示的列表

  aboutToAppear(): void {
    this.getDataByIdType("全部", null, null)
  }

  build() {
    Column() {

      //tab栏
      Scroll(this.scroller) {
        Row() {
          ForEach(this.titles, (item: MyTabBean, index: number) => {
            if (index == 0) {
              Text(item.name)
                .padding({ left: '30lpx', right: '16lpx' ,top:'5lpx',bottom:'5lpx'})
                .fontColor(index == this.titles.length - 1 ? "#FF1919" : "#2E2E2E")
                .fontSize('30lpx')
                .transition(TransitionEffect.OPACITY.animation({ duration: 200 }))
                .onAreaChange((previousArea: Area, currentArea: Area) => {
                  if (item.x == -1) {
                    item.x = currentArea.position.x as number
                  }
                  if (item.width == -1) {
                    item.width = currentArea.width as number
                  }
                })
                .onClick(() => {
                  this.getDataByIdType("全部", null, null)
                })
            } else {
              Row() {
                Text(">").width('44lpx').height('44lpx')
                Text(item.name)
                  .fontColor(index == this.titles.length - 1 ? "#FF1919" : "#2E2E2E")
                  .fontSize('30lpx')
              }.padding({ right: '16lpx' ,top:'5lpx',bottom:'5lpx'})
              .transition(TransitionEffect.OPACITY.animation({ duration: 200 }))
              .onAreaChange((previousArea: Area, currentArea: Area) => {
                if (item.x == -1) {
                  item.x = currentArea.position.x as number
                }
                if (item.width == -1) {
                  item.width = currentArea.width as number
                }
              })
              .onClick(() => {
                this.getDataByIdType(item.name, item.idType, item.idContent, index)
              })
            }
          })
        }.height('95lpx')
        .onAreaChange((previousArea: Area, currentArea: Area) => {
          let scrollWidth = currentArea.width as number
          console.info(`scrollWidth:${scrollWidth}`)
          if (this.titles.length > 0 && this.scrollWidthOld != scrollWidth) {
            this.scrollWidthOld = scrollWidth
            let item = this.titles[this.titles.length-1]
            this.scroller.scrollTo({
              xOffset: (item.x - scrollWidth / 2 + item.width / 2),
              yOffset: 0,
              animation: true
            })
          }
        })
      }
      .scrollable(ScrollDirection.Horizontal)
      .scrollBar(BarState.Off)
      .borderWidth({ bottom: 1 })
      .borderColor("#e3e3e3")
      .align(Alignment.Start)
      .width('100%')


      //内容
      Scroll() {
        Column() {
          ForEach(this.contentList, (item: contentItem, index: number) => {
            if (index != 0) {
              Text()
                .height(1)
                .width('720lpx')
                .margin({ left: '30lpx' })
                .backgroundColor("#e3e3e3")
            }
            Row() {
              Column() {
                Text(item.name).fontSize('30lpx').fontColor("#4B4B4B")
              }.layoutWeight(1).alignItems(HorizontalAlign.Start).justifyContent(FlexAlign.Center)
            }
            .width('100%')
            .backgroundColor(Color.White)
            .padding({ top: '20lpx', bottom: '20lpx' })
            .onClick(() => {
              this.getDataByIdType(item.name, item.idType, item.idContent)
              // else{//是叶子节点了，点击需要调用加入部门接口
              //   // for(let i = 0 ;i<this.contentList.length;i++){
              //   //   this.contentList[i].isSelect = false
              //   // }
              //
              // }
            })
          })
        }
        .width('100%')
        .padding({ left: '30lpx', right: '30lpx' })
        .margin({ top: '20lpx', bottom: '20lpx' })
        .borderWidth({ top: 1, bottom: 1 })
        .borderColor("#e3e3e3")
        .backgroundColor(Color.White)
      }
      .align(Alignment.Top)
      .width('100%')
      .layoutWeight(1)
      .scrollBar(BarState.Off)
      .backgroundColor("#fafafa")
      .visibility(this.contentList.length != 0 ? Visibility.Visible : Visibility.None)

    }
    .height('100%')
    .width('100%');
  }

  // 封装一个方法来根据ID类型和具体内容返回相应的数据
  //idType: 'province' | 'city' | null
  getDataByIdType(name: string, idType: string | null, idContent: string | null, index?: number) {


    console.info(`内容填充`)

    let contentItems: contentItem[] = [];

    if (idType === null) {
      // 如果idType为空，返回所有省份的不重复数据
      const seenProvinces: object = Object();

      for (let i = 0; i < transformedData.length; i++) {
        const item = transformedData[i];
        const provinceKey = item.provincename + item.provinceid;

        if (!seenProvinces[provinceKey]) {
          seenProvinces[provinceKey] = true;
          contentItems.push({
            name: item.provincename,
            idType: 'province',
            idContent: item.provinceid
          });
        }
      }
    } else {
      // 如果idType为省份或城市，筛选出相应级别的所有数据
      for (let i = 0; i < transformedData.length; i++) {
        const item = transformedData[i];

        if (idType === 'province') {
          // 如果idType为省份，筛选出指定省份下的所有数据
          if (item.provinceid === idContent) {
            contentItems.push({
              name: item.cityname,
              idType: 'city',
              idContent: item.cityid
            });
          }
        } else if (idType === 'city') {
          // 如果idType为城市，筛选出指定城市下的所有数据
          if (item.cityid === idContent) {
            contentItems.push({
              name: item.countyname,
              idType: 'county',
              idContent: item.countyid
            });
          }
        }
      }
    }
    if(contentItems.length == 0){
      let str = ""
      for(let i = 0 ;i<transformedData.length;i++){
        if(idContent ==transformedData[i].countyid ){
          str = `省：${transformedData[i].provincename}，市：${transformedData[i].cityname}，区：${transformedData[i].countyname}`
          break;
        }
      }
      promptAction.showDialog({
        title: '当前选中的是',
        message: `${str}`,
        buttons: [
          {
            text: '我知道了',
            color: '#000000'
          }
        ],
      })
      return
    }
    this.contentList = [...contentItems]


    //标题栏填充
    console.info(`标题栏填充`)
    if (!idType) {
      console.info(`用户点了根，或者是首次启动的`)
      this.titles = [new MyTabBean(name)]
    } else {
      //清空index之后的
      console.info(`index:${index}`)
      console.info(`this.titles:${JSON.stringify(this.titles)}`)
      if (index) {
        this.titles.splice(index)
      }
      let myTabBean = new MyTabBean(name)
      myTabBean.idType = idType
      myTabBean.idContent = idContent
      this.titles.push(myTabBean)
      console.info(`this.titles:${JSON.stringify(this.titles)}`)
    }
  }
}


class contentItem {
  name: string = "";
  idType: string | null = null; //'province' | 'city' | 'county' | null
  idContent: string | null = null;
}