[移动开发]微信小程序二级联动 学校学院 picke

我的需求是一级部门（学校或者学院）跟二级部门（学校或者学院的部门）的联动。

json的数据结构是：

?[
? ? ? [{id: "1", name: "部门00A"}, {id: "2", name: "部门00B"}],

? ? ?[{id: "4", name: "保定党校", parentId: "1"}, {id: "5", name: "唐山党校", parentId: "1"},{id: "6", name: "石家庄党校", parentId: "1"},{id: "7", name: "湖北党校", parentId: "2"},{id: "8", name: "湖南党校", parentId: "2"},{id: "9", name: "海南党校", parentId: "2"}]

]

?

wxml代码：

<view class="reg-item" wx:if="{{reg == false}}">
            <picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange" value="{{multiIndex}}" range="{{multiArray}}" range-key="name">
                <view wx:if="{{index == 0}}" class="reg-input-p reg-picker">
                    请选择所属部门
                </view>
                <view wx:else class="reg-input reg-picker">
                    {{multiArray[0][multiIndex[0]].name}} {{multiArray[1][multiIndex[1]].name}}
                </view>
            </picker>
        </view>

?js代码是：

var app = getApp();

Page({
    data: {
        objectMultiArray:[], 
        multiArray: [],      
        multiIndex: [0,0],
    },
    onLoad: function () {
        this.getDepartment();
    },



    //获取json数据并给默认值
    getDepartment() {
        var that = this
        app.util.request({
            url: 'entry/wxapp/getdepartments',
            method: 'POST',
            success: function (result) {
                that.setData({
                    objectMultiArray: result.data.data 
                });


                //把接受的数据根据一级的默认第一个组成二级部门默认数组

                that.data.multiArray[0] = that.data.objectMultiArray[0];
                var i = 0,arr = [];
                that.data.objectMultiArray[1].forEach(function(item){
                    
                    if(that.data.objectMultiArray[0][0].id == item.parentId){
                        arr[i] = item;
                        i++;
                    }
                })
                that.data.multiArray[1] = arr;
                that.setData({
                    multiArray: that.data.multiArray
                });

            }
        })
    },


    bindMultiPickerChange(e) {
        console.log('picker发送选择改变，携带值为', e)
        var that = this
        that.setData({
            multiIndex: e.detail.value,
        })
    },

    //picker 选择联动事件
    bindMultiPickerColumnChange: function (e) {
        console.log('修改的列为', e.detail.column, '，值为', e.detail.value);
        let objectMultiShow = [];
        var that = this;
        var data = {
            multiArray: this.data.multiArray,
            multiIndex: this.data.multiIndex
          };

        data.multiIndex[e.detail.column] = e.detail.value;
        //一级赋值
        data.multiArray[0] = that.data.objectMultiArray[0];
        //判断是否是操作一级
        if(e.detail.column === 0){
            var i = 0,arr = [];
            //根据一级的id把二级循环赋值
            that.data.objectMultiArray[1].forEach(function(item){   
                if(that.data.objectMultiArray[0][e.detail.value].id == item.parentId){
                    arr[i] = item;
                    i++;
                }
            })
            data.multiArray[1] = arr;
            //重新渲染数据
            this.setData(data);
        }
        
        
    },


});

效果图

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