微信小程序 picker 组件 mode=date 是三级联动的，但是无法自定义。
picker-view 组件可以同时选择多项，但是不能做到联动，所以就想着要不采用3个 picker组件组合联动试试。反正刚开始学，就来练练手，卷起袖子撸起来 >>>
// test.wxml
<view class="container">
<view class="item">
<text class="item-name">地址</text>
<text class="item-content">{{province}} {{city}} {{area}}</text>
<image class="arrow_left" src="../../images/play.png"></image>
</view>
<view style="display:flex;">
<picker-view indicator-style="height: 50px;" style="width: 100%;height: 150px;text-align: center" value="{{value}}" bindchange="changeProvince">
<picker-view-column>
<view wx:for="{{provinces}}" wx:key="*this" style="line-height: 50px">{{item}}</view>
</picker-view-column>
</picker-view>
<picker-view indicator-style="height: 50px;" style="width: 100%;height: 150px;text-align: center" value="{{value}}" bindchange="changeCity">
<picker-view-column>
<view wx:for="{{citys}}" wx:key="*this" style="line-height: 50px">{{item}}</view>
</picker-view-column>
</picker-view>
<picker-view indicator-style="height: 50px;" style="width: 100%;height: 150px;text-align: center" value="{{value}}" bindchange="changeArea">
<picker-view-column>
<view wx:for="{{areas}}" wx:key="*this" style="line-height: 50px">{{item}}</view>
</picker-view-column>
</picker-view>
</view>
</view>
//test.js 截取了部分省市区数据
const placeArray = [
{
"name": "北京",
"city": [{
"name": "北京",
"area": ["东城区", "西城区", "崇文区", "宣武区", "朝阳区", "丰台区", "石景山区", "海淀区", "门头沟区", "房山区", "通州区", "顺义区", "昌平区", "大兴区", "平谷区", "怀柔区", "密云县", "延庆县"]
}]
},
{
"name": "天津",
"city": [{
"name": "天津",
"area": ["和平区", "河东区", "河西区", "南开区", "河北区", "红桥区", "塘沽区", "汉沽区", "大港区", "东丽区", "西青区", "津南区", "北辰区", "武清区", "宝坻区", "宁河县", "静海县", "蓟 县"]
}]
},
{
"name": "河北",
"city": [
{
"name": "石家庄",
"area": ["长安区", "桥东区", "桥西区", "新华区", "郊 区", "井陉矿区", "井陉县", "正定县", "栾城县", "行唐县", "灵寿县", "高邑县", "深泽县", "赞皇县", "无极县", "平山县", "元氏县", "赵 县", "辛集市", "藁", "晋州市", "新乐市", "鹿泉市"]
},
{
"name": "唐山",
"area": ["路南区", "路北区", "古冶区", "开平区", "新 区", "丰润县", "滦 县", "滦南县", "乐亭县", "迁西县", "玉田县", "唐海县", "遵化市", "丰南市", "迁安市"]
},
{
"name": "秦皇岛",
"area": ["海港区", "山海关区", "北戴河区", "青龙满族自治县", "昌黎县", "抚宁县", "卢龙县"]
},
{
"name": "邯郸",
"area": ["邯山区", "丛台区", "复兴区", "峰峰矿区", "邯郸县", "临漳县", "成安县", "大名县", "涉 县", "磁 县", "肥乡县", "永年县", "邱 县", "鸡泽县", "广平县", "馆陶县", "魏 县", "曲周县", "武安市"]
},
{
"name": "邢台",
"area": ["桥东区", "桥西区", "邢台县", "临城县", "内丘县", "柏乡县", "隆尧县", "任 县", "南和县", "宁晋县", "巨鹿县", "新河县", "广宗县", "平乡县", "威 县", "清河县", "临西县", "南宫市", "沙河市"]
},
{
"name": "保定",
"area": ["新市区", "北市区", "南市区", "满城县", "清苑县", "涞水县", "阜平县", "徐水县", "定兴县", "唐 县", "高阳县", "容城县", "涞源县", "望都县", "安新县", "易 县", "曲阳县", "蠡 县", "顺平县", "博野", "雄县", "涿州市", "定州市", "安国市", "高碑店市"]
},
{
"name": "张家口",
"area": ["桥东区", "桥西区", "宣化区", "下花园区", "宣化县", "张北县", "康保县", "沽源县", "尚义县", "蔚 县", "阳原县", "怀安县", "万全县", "怀来县", "涿鹿县", "赤城县", "崇礼县"]
},
{
"name": "承德",
"area": ["双桥区", "双滦区", "鹰手营子矿区", "承德县", "兴隆县", "平泉县", "滦平县", "隆化县", "丰宁满族自治县", "宽城满族自治县", "围场满族蒙古族自治县"]
},
{
"name": "沧州",
"area": ["新华区", "运河区", "沧 县", "青 县", "东光县", "海兴县", "盐山县", "肃宁县", "南皮县", "吴桥县", "献 县", "孟村回族自治县", "泊头市", "任丘市", "黄骅市", "河间市"]
},
{
"name": "廊坊",
"area": ["安次区", "固安县", "永清县", "香河县", "大城县", "文安县", "大厂回族自治县", "霸州市", "三河市"]
},
{
"name": "衡水",
"area": ["桃城区", "枣强县", "武邑县", "武强县", "饶阳县", "安平县", "故城县", "景 县", "阜城县", "冀州市", "深州市"]
}
]
}];
var provinces = [];
var citys = [];
var areas = [];
function getProvinces(){
for (let i = 0; i < placeArray.length; i++) {
provinces.push(placeArray[i].name)
}
console.log(provinces)
}
function getCitys(n){
citys = [];
const theCitys = placeArray[n].city;
for (let i = 0; i < theCitys.length; i++) {
citys.push(theCitys[i].name)
}
console.log(citys)
}
function getAreas(m,n){
areas = [];
if(placeArray[m].city[n]){ //province修改，city.length会逐个变化，若变化后比变化前小，会报错
const theAreas = placeArray[m].city[n].area;
for (let i = 0; i < theAreas.length; i++) {
areas.push(theAreas[i])
}
console.log(areas)
}
}
//初始化
getProvinces()
getCitys(0)
getAreas(0,0)
Page({
data:{
provinces: provinces,
province: provinces[0] || "",
pIndex: 0,
citys: citys || [],
city: citys[0] || "",
cIndex: 0,
areas: areas || [],
area: areas[0] || "",
aIndex: 0
},
changeProvince: function(e){
const val = e.detail.value
getCitys(val) //联动
getAreas(val,0) //联动
this.setData({
province: provinces[val],
pIndex: val,
citys: citys,
city: citys[0],
cIndex: 0,
areas: areas,
area: areas[0],
aIndex: 0
})
},
changeCity: function(e){
const val = e.detail.value
getAreas(this.data.pIndex,val) //联动
this.setData({
city: citys[val],
cIndex: val,
areas: areas,
area: areas[0],
aIndex: 0
})
},
changeArea: function(e){
const val = e.detail.value
this.setData({
area: areas[val],
aIndex: val
})
}
})
效果如图：
省市区三级联动.gif
总结：凑合能用吧，欢迎板砖。缺点是，省市改变后，后面的数据不会滚动到最顶端来。暂时还不知道怎么搞，如果您有相应的解决办法，还请给我留言，3Q _
自己找到了新的更简单高效的解决方法：微信小程序：省市区三级联动（升级版）
