uniapp 使用uview组件实现省市区三级联动（任意三级联动）_uview 省市区

<template>
	<view class="invite">
		<u-cell  title="点击选则" isLink :value="value" @click="change()"></u-cell>
		<u-picker
			:show="show"
			ref="uPicker"
			:columns="columns"
			@confirm="confirm"
			@cancel="show=false"
			@change="changeHandler"
		></u-picker>
	</view>
</template>

<script>
// import { address } from '@/static/address.js';
export default {
	data() {
		return {
			show: false,
			columns: [],
			origiData: [{
  "code": "110000",
  "value": "北京市",
  "children": [{
    "code": "110100",
    "value": "北京市",
    "children": [{
      "code": "110101",
      "value": "东城区"
    }, {
      "code": "110102",
      "value": "西城区"
    }, {
      "code": "110105",
      "value": "朝阳区"
    }, {
      "code": "110106",
      "value": "丰台区"
    }, {
      "code": "110107",
      "value": "石景山区"
    }, {
      "code": "110108",
      "value": "海淀区"
    }, {
      "code": "110109",
      "value": "门头沟区"
    }, {
      "code": "110111",
      "value": "房山区"
    }, {
      "code": "110112",
      "value": "通州区"
    }, {
      "code": "110113",
      "value": "顺义区"
    }, {
      "code": "110114",
      "value": "昌平区"
    }, {
      "code": "110115",
      "value": "大兴区"
    }, {
      "code": "110116",
      "value": "怀柔区"
    }, {
      "code": "110117",
      "value": "平谷区"
    }, {
      "code": "110118",
      "value": "密云区"
    }, {
      "code": "110119",
      "value": "延庆区"
    }]
  }]
}, {
  "code": "120000",
  "value": "天津市",
  "children": [{
    "code": "120100",
    "value": "天津市",
    "children": [{
      "code": "120101",
      "value": "和平区"
    }, {
      "code": "120102",
      "value": "河东区"
    }, {
      "code": "120103",
      "value": "河西区"
    }, {
      "code": "120104",
      "value": "南开区"
    }, {
      "code": "120105",
      "value": "河北区"
    }, {
      "code": "120106",
      "value": "红桥区"
    }, {
      "code": "120110",
      "value": "东丽区"
    }, {
      "code": "120111",
      "value": "西青区"
    }, {
      "code": "120112",
      "value": "津南区"
    }, {
      "code": "120113",
      "value": "北辰区"
    }, {
      "code": "120114",
      "value": "武清区"
    }, {
      "code": "120115",
      "value": "宝坻区"
    }, {
      "code": "120116",
      "value": "滨海新区"
    }, {
      "code": "120117",
      "value": "宁河区"
    }, {
      "code": "120118",
      "value": "静海区"
    }, {
      "code": "120119",
      "value": "蓟州区"
    }]
  }]
}, {
  "code": "130000",
  "value": "河北省",
  "children": [{
    "code": "130100",
    "value": "石家庄市",
    "children": [{
      "code": "130102",
      "value": "长安区"
    }, {
      "code": "130104",
      "value": "桥西区"
    }, {
      "code": "130105",
      "value": "新华区"
    }, {
      "code": "130107",
      "value": "井陉矿区"
    }, {
      "code": "130108",
      "value": "裕华区"
    }, {
      "code": "130109",
      "value": "藁城区"
    }, {
      "code": "130110",
      "value": "鹿泉区"
    }, {
      "code": "130111",
      "value": "栾城区"
    }, {
      "code": "130121",
      "value": "井陉县"
    }, {
      "code": "130123",
      "value": "正定县"
    }, {
      "code": "130125",
      "value": "行唐县"
    }, {
      "code": "130126",
      "value": "灵寿县"
    }, {
      "code": "130127",
      "value": "高邑县"
    }, {
      "code": "130128",
      "value": "深泽县"
    }, {
      "code": "130129",
      "value": "赞皇县"
    }, {
      "code": "130130",
      "value": "无极县"
    }, {
      "code": "130131",
      "value": "平山县"
    }, {
      "code": "130132",
      "value": "元氏县"
    }, {
      "code": "130133",
      "value": "赵县"
    }, {
      "code": "130181",
      "value": "辛集市"
    }, {
      "code": "130183",
      "value": "晋州市"
    }, {
      "code": "130184",
      "value": "新乐市"
    }]
  }],
  }],  //获取到的原始数据
			value:"", 		     //
		};
	},
	mounted() {
		this.handelData();
	},
	methods: {
		change(){
			this.show=true;
		},
		//初始化开始数据
		handelData() {
			// console.log(this.origiData.value))
			let sheng = [];
			let shi = [];
			let qu = [];
			this.origiData.forEach(item => {
				sheng.push(item.value);
				// 设置出初始化的数据
				if (item.value == '北京市') {
					item.children.forEach(child => {
						shi.push(child.value);

						if (child.value == '北京市') {
							child.children.forEach(el => {
								qu.push(el.value);
							});
						}
					});
				}
			});
			this.columns.push(
				JSON.parse(JSON.stringify(sheng)),
				JSON.parse(JSON.stringify(shi)),
				JSON.parse(JSON.stringify(qu))
			);
		},
		changeHandler(e) {
			const {
				columnIndex,
				value,
				values, // values为当前变化列的数组内容
				index,
				// 微信小程序无法将picker实例传出来，只能通过ref操作
				picker = this.$refs.uPicker
			} = e;
			// console.log('测试数据', e);
			// 当第一列值发生变化时，变化第二列(后一列)对应的选项
			if (columnIndex === 0) {
				// console.log(value)
				// picker为选择器this实例，变化第二列对应的选项
				this.origiData.forEach(item => {
					if (value[0] == item.value) {
						let shi = [];
						let flag = item.children[0].value;
						item.children.forEach((val, ol) => {
							shi.push(val.value);
							if (shi[0] == flag) {   //设置默认开关（选择省份后设置默认城市）
								flag = '';
								let qu = [];
								val.children.forEach(vol => {
									qu.push(vol.value);
								});
								picker.setColumnValues(2, qu);
							}
						});
						picker.setColumnValues(1, shi);
					}
				});
			}
			//当第二列变化时，第三列对应变化
			if (columnIndex === 1) {
				this.origiData.forEach(item => {
					if (value[0] == item.value) {
						let shi = [];
						item.children.forEach((val, ol) => {
							shi.push(val.value);
							if (value[1] == val.value) {
								let qu = [];
								val.children.forEach(vol => {
									qu.push(vol.value);
								});
								picker.setColumnValues(2, qu);
							}
						});
					}
				});
			}
		},
		// 确认选中的数据
		confirm(e) {
			// console.log('confirm', JSON.stringify(e));
			this.value=e.value[0]+e.value[1]+e.value[2]
			this.show = false;
		}
	}
};
</script>

<style></style>

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