小程序实现多列选择器

<view class="container"> <form catchsubmit="formSubmit">  <view class="form-card">   <view class="weui-cell weui-cell_input">    <view class="weui-cell__hd">     <view class="weui-label">物种<span>*</span></view>    </view>    <view class="weui-cell__bd">     <picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange" value="{{multiIndex}}" range="{{multiArray}}">      <view class="weui-input">{{multiArray[0][multiIndex[0]]}}{{multiArray[1][multiIndex[1]]}}{{multiArray[2][multiIndex[2]]}}</view>     </picker>    </view>   </view>  </view> </form>  </view>

Page({  /**  * 页面的初始数据  */ data: {  objectMultiShow: [],  objectMultiArray: [],  multiArray: [],  multiIndex: [],  checkeIndex: [] },  /**  * 生命周期函数--监听页面加载  * objectMultiShow--匹配多列选择器渲染数据所对应的json数据（包含id，parentId，name）  * multiArray--多列选择器渲染数据  */ onLoad: function (options) {  // 初始化  let data = {   objectMultiShow: this.data.objectMultiShow,   objectMultiArray: this.data.objectMultiArray,   multiArray: this.data.multiArray,   multiIndex: this.data.multiIndex,   checkeIndex: this.data.checkeIndex  }  data.objectMultiArray = [   [{ id: 0, name: '无脊柱动物' }, { id: 1, name: '脊柱动物' }],   [    { id: 0, name: '扁性动物', parentId: 0 }, { id: 1, name: '线形动物', parentId: 0 }, { id: 2, name: '环节动物', parentId: 0 }, { id: 3, name: '软体动物', parentId: 0 }, { id: 4, name: '节肢动物', parentId: 0 },    { id: 5, name: '鱼', parentId: 1 }, { id: 6, name: '两栖动物', parentId: 1 }, { id: 7, name: '爬行动物', parentId: 1 }   ],   [    { id: 0, name: '猪肉绦虫', parentId: 0 }, { id: 1, name: '吸血虫', parentId: 0 },    { id: 2, name: '蛔虫', parentId: 1 },    { id: 3, name: '蚂蚁', parentId: 2 }, { id: 4, name: '蚂蟥', parentId: 2 },    { id: 5, name: '河蚌', parentId: 3 }, { id: 6, name: '蜗牛', parentId: 3 }, { id: 7, name: '蛞蝓', parentId: 3 },    { id: 8, name: '昆虫', parentId: 4 }, { id: 9, name: '甲壳动物', parentId: 4 }, { id: 10, name: '蛛形动物', parentId: 4 }, { id: 11, name: '多足动物', parentId: 4 },    { id: 3, name: '鲫鱼', parentId: 5 }, { id: 4, name: '带鱼', parentId: 5 },    { id: 3, name: '青蛙', parentId: 6 }, { id: 4, name: '娃娃鱼', parentId: 6 },    { id: 3, name: '蜥蜴', parentId: 7 }, { id: 4, name: '龟', parentId: 7 }, { id: 4, name: '壁虎', parentId: 7 },   ]  ]  data.objectMultiShow = data.objectMultiArray.map((item, index) => {   if (index > 0) {    item = item.filter(i => i.parentId === data.objectMultiArray[index - 1][0].id)   }   return item  })  data.multiArray = data.objectMultiShow.map(item => {   item = item.map(i => i.name)   return item  })  console.log(data.multiIndex)  // 数据更新  this.setData(data) },  bindMultiPickerChange: function (e) {  console.log('picker发送选择改变，携带值为', e.detail.value)  this.setData({   multiIndex: e.detail.value  }) }, bindMultiPickerColumnChange: function (e) {  console.log('修改的列为', e.detail.column, '，值为', e.detail.value);  // 初始化数据  var data = {   objectMultiShow: this.data.objectMultiShow,   multiArray: this.data.multiArray,   multiIndex: this.data.multiIndex  };   // 改变第i列数据之后，后几列选择第0个选项（重置）  data.multiIndex[e.detail.column] = e.detail.value;  for (let i = e.detail.column; i < data.multiIndex.length - 1; i++) {   data.multiIndex[i + 1] = 0  }   /**   * 改变第i列数据之后，后几列数据更新   * 两种写法：for 和 switch，switch为三列选择器写法，for由switch精简拓展过来，可用于多列选择器   * swich写法：如果更改的是第一列数据，第二列数据通过filter筛选（parentId = 第一列选中项id），同时更新第三列数据   *      如果更改的是第二列数据，更新第三列数据 通过filter筛选（parentId = 第二列选中项id）   */  let arry = this.data.objectMultiArray  for (let i = e.detail.column; i < data.multiIndex.length - 1; i++) {   data.objectMultiShow[i + 1] = arry[i + 1].filter(item => item.parentId === data.objectMultiShow[i][data.multiIndex[i]].id)   data.multiArray[i + 1] = data.objectMultiShow[i + 1].map(item => item.name)  }  /*switch (e.detail.column) {   case 0:    data.objectMultiShow[1] = arry[1].filter(item => item.parentId === data.objectMultiShow[0][data.multiIndex[0]].id)    data.multiArray[1] = data.objectMultiShow[1].map(item => item.name)    data.objectMultiShow[2] = arry[2].filter(item => item.parentId === data.objectMultiShow[1][data.multiIndex[1]].id)    data.multiArray[2] = data.objectMultiShow[2].map(item => item.name)    break;   case 1:    data.objectMultiShow[2] = arry[2].filter(item => item.parentId === data.objectMultiShow[1][data.multiIndex[1]].id)    data.multiArray[2] = data.objectMultiShow[2].map(item => item.name)  }*/  // 数据更新  this.setData(data); }})