微信小程序中怎么实现一个picker多列选择器

微信小程序中怎么实现一个picker多列选择器，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。

一、效果图（多列）

二、普通选择器：mode = selector、多列选择器：mode = multiSelector

文档地址：微信开发文档 picker选择器

• 普通选择器：mode = selector，一维数组：array: ['美国', '中国', '巴西', '日本']

• 多列选择器：mode = multiSelector，二维数组：multiArray: [['无脊柱动物', '脊柱动物'], ['扁性动物', '线形动物', '环节动物', '软体动物', '节肢动物'], ['猪肉绦虫', '吸血虫']]

格式不对，要处理成对应数组格式，占坑图：

三、app.JSON

{  "pages": [    "pages/index/index",    "pages/logs/logs",    "pages/picker/picker"  ],  "entryPagePath": "pages/picker/picker",  "window": {    "backgroundTextStyle": "light",    "navigationBarBackgroundColor": "#fff",    "navigationBarTitleText": "Weixin",    "navigationBarTextStyle": "black"  },  "sitemapLocation": "sitemap.json",  "usinGComponents": {    "van-button": "@vant/weapp/button/index",    "van-area": "@vant/weapp/area/index"  }}

四、picker.wxml

<!--pages/picker/picker.wxml--><view>  <view class="section__title">多列选择器</view>  <picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange"    value="{{multiIndex}}" range="{{newArr}}">    <view class="picker">      当前选择： <van-button type="primary">        {{newArr[0][multiIndex[0]]}}，{{newArr[1][multiIndex[1]]}}，{{newArr[2][multiIndex[2]]}}</van-button>    </view>  </picker></view>

五、picker.js

多列选择器：mode = multiSelector

注意看数组格式：multiArray数组 有 children，要处理二维数组：

// pages/picker/picker.jsPage({    data: {    multiArray: [{        id: 1,        label: "东南",        children: [{            id: 2,            label: "上海",            children: [{                id: 3,                label: "普陀",              },              {                id: 4,                label: "黄埔",              },              {                id: 5,                label: "徐汇",              },            ],          },          {            id: 7,            label: "江苏",            children: [{                id: 8,                label: "南京",              },              {                id: 9,                label: "苏州",              },              {                id: 10,                label: "无锡",              },            ],          },          {            id: 12,            label: "浙江",            children: [{                id: 13,                label: "杭州",              },              {                id: 14,                label: "宁波",              },              {                id: 15,                label: "嘉兴",              },            ],          },        ],      },      {        id: 17,        label: "西北",        children: [{            id: 18,            label: "陕西",            children: [{                id: 19,                label: "西安",              },              {                id: 20,                label: "延安",              },            ],          },          {            id: 21,            label: "新疆维吾尔族自治区",            children: [{                id: 22,                label: "乌鲁木齐",              },              {                id: 23,                label: "克拉玛依",              },            ],          },        ],      },    ],    multiIndex: [0, 0, 0],    multiIds: [],    newArr: [],  },  bindMultiPickerChange(e) {    console.log(this.data.multiIds);  },  bindMultiPickerColumnChange(e) {    let data = {      newArr: this.data.newArr,      multiIndex: this.data.multiIndex,      multiIds: this.data.multiIds,    };    data.multiIndex[e.detail.column] = e.detail.value;    let searchColumn = () => {      let arr1 = [];      let arr2 = [];      this.data.multiArray.map((v, vk) => {        if (data.multiIndex[0] === vk) {          data.multiIds[0] = {            ...v,          };          v.children.map((c, ck) => {            arr1.push(c.label);            if (data.multiIndex[1] === ck) {              data.multiIds[1] = {                ...c,              };              c.children.map((t, vt) => {                arr2.push(t.label);                if (data.multiIndex[2] === vt) {                  data.multiIds[2] = {                    ...t,                  };                }              });            }          });        }      });      data.newArr[1] = arr1;      data.newArr[2] = arr2;    };    switch (e.detail.column) {      case 0:        // 每次切换还原初始值        data.multiIndex[1] = 0;        data.multiIndex[2] = 0;        // 执行函数处理        searchColumn();        break;      case 1:        data.multiIndex[2] = 0;        searchColumn();        break;    }    this.setData(data);  },    onLoad: function (options) {    let state = {      arr: [],      arr1: [],      arr2: [],      arr3: [],      multiIds: []    }    this.data.multiArray.map((v, vk) => {      state.arr1.push(v.label);      if (this.data.multiIndex[0] === vk) {        state.multiIds[0] = v;      }      if (state.arr2.length <= 0) {        v.children.map((c, ck) => {          state.arr2.push(c.label);          if (this.data.multiIndex[1] === ck) {            state.multiIds[1] = c;          }          if (state.arr3.length <= 0) {            c.children.map((t, tk) => {              state.arr3.push(t.label);              if (this.data.multiIndex[2] === tk) {                state.multiIds[2] = t;              }            });          }        });      }    });    state.arr[0] = state.arr1;    state.arr[1] = state.arr2;    state.arr[2] = state.arr3;    this.setData({      newArr: state.arr,      multiIds: state.multiIds,    });  },    onReady: function () {},    onShow: function () {},    onHide: function () {},    onUnload: function () {},    onPullDownRefresh: function () {},    onReachBottom: function () {},    onShareAppMessage: function () {},});

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