小程序picker多列选择器：四级联动

效果图

直接上代码：

wxml文件

<!--多列选择器-->
<picker mode="multiSelector" bindchange="multiChange" bindcolumnchange="columnChange" value="{{multiIndex}}" range="{{multiArray}}" range-key="label">
      <view class="picker">
		{{multiArray[0][multiIndex[0]].label}}，
		{{multiArray[0][multiIndex[0]].children[multiIndex[1]].label}}，
		{{multiArray[0][multiIndex[0]].children[multiIndex[1]].children[multiIndex[2]].label}}，
		{{multiArray[0][multiIndex[0]].children[multiIndex[1]].children[multiIndex[2]].children[multiIndex[3]].label}}，
      </view>
</picker>

js文件

// pages/multiPicker/multiPicker.js
Page({

	/**
	 * 页面的初始数据
	 */
	data: {
		// 模拟的数据
		multiData: [{
				"label": "河南省",
				"value": 1,
				"children": [{
						"label": "郑州市",
						"value": 1,
						"children": [{
								"label": "金水区",
								"value": 1,
								"children": [{
										"label": "金水路",
										"value": 1
									},
									{
										"label": "民航路",
										"value": 2
									}
								]
							},
							{
								"label": "郑东新区",
								"value": 2,
								"children": [{
									"label": "高铁东站",
									"value": 3
								}]
							},
							{
								"label": "高新区",
								"value": 3,
								"children": [{
										"label": "西四环",
										"value": 4
									},
									{
										"label": "高新路",
										"value": 5
									}
								]
							}
						]
					},
					{
						"label": "新乡市",
						"value": 1,
						"children": [{
							"label": "红旗区",
							"value": 1,
							"children": [{
									"label": "荣校东路",
									"value": 1
								},
								{
									"label": "人民路",
									"value": 2
								}
							]
						}, ]
					},
				],
			},
			{
				"label": "北京市",
				"value": 1,
				"children": [{
					"label": "北京市",
					"value": 1,
					"children": [{
							"label": "西城区",
							"value": 1,
							"children": [{
									"label": "西单",
									"value": 1
								},
								{
									"label": "西单四十条",
									"value": 1
								},
							]
						},
						{
							"label": "东城区",
							"value": 2,
							"children": [{
									"label": "东单",
									"value": 3
								},
								{
									"label": "东单四十条",
									"value": 1
								},
							]
						},
					]
				}, ],
			}
		],
		multiIndex: [0, 0, 0, 0],
	},

	/**
	 * 生命周期函数--监听页面加载
	 */
	onLoad: function (options) {

	},

	/**
	 * 生命周期函数--监听页面初次渲染完成
	 */
	onReady: function () {
		var _this = this;
		console.log(_this.data.multiData);
		var multiData = _this.data.multiData;
		var multiIndex = _this.data.multiIndex;

		// 初始化多列数据
		_this.setData({
			multiArray: [
				multiData,
				multiData[0].children,
				multiData[0].children[0].children,
				multiData[0].children[0].children[0].children
			],
		})
		// console.log(_this.data.multiArray);
	},

	/**
	 * 生命周期函数--监听页面显示
	 */
	onShow: function () {

	},

	/**
	 * 多列选择器：
	 */
	// 获取多列的索引
	multiChange: function (e) {
		// console.log(e);
		var _this = this;
		var multiIndex = e.detail.value;
		console.log(multiIndex);

		_this.setData({
			multiIndex: multiIndex,
		})

	},

	// 选择列
	columnChange: function (e) {
		// console.log(e);
		var _this = this;
		var multiData = _this.data.multiData;
		var multiIndex = _this.data.multiIndex;
		var columnIndex = e.detail.column;
		var columnValue = e.detail.value;

		multiIndex[columnIndex] = columnValue;

		_this.setData({
			multiArray: [
				multiData,
				multiData[multiIndex[0]].children,
				multiData[multiIndex[0]].children[multiIndex[1]].children,
				multiData[multiIndex[0]].children[multiIndex[1]].children[multiIndex[2]].children
			],
		})
	},


})

懒人专用：
链接在此