三级联动

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我是靠谱客的博主复杂帽子，最近开发中收集的这篇文章主要介绍三级联动，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

js代码

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 = [
[
{ parentKey: 7, key: 26, name: "智慧大厦" }],
[{ parentKey: 26, key: 27, name: "9F" },
{ parentKey: 26, key: 28, name: "12F" },
{ parentKey: 26, key: 29, name: "15F" },

{ parentKey: 26, key: 30, name: "11F" }
]，
[{ parentKey:29, key: 31, name: "1501F" },
{ parentKey: 29, key: 32, name: "1502F" },
{ parentKey: 29, key: 33, name: "1503F" },

{ parentKey: 29, key: 34, name: "1504F" }
]

]
data.objectMultiShow = data.objectMultiArray.map((item, index) => {
if (index > 0) {
item = item.filter(i => i.parentKey === data.objectMultiArray[index - 1][0].key)
}
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.parentKey === data.objectMultiShow[i][data.multiIndex[i]].key)
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);
}
})

wxml代码：

<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">楼<span>*</span></view>
</view>
<view class="weui-cell__bd">
<picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange" value="{{multiIndex}}" range="{{multiArray}}">
<view class="weui-input">选择：{{multiArray[0][multiIndex[0]]}}{{multiArray[1][multiIndex[1]]}}{{multiArray[2][multiIndex[2]]}}</view>
</picker>
</view>
</view>
</view>
</form>
</view>