目前学习小程序更多的是看看能否二次封装其它组件,利于以后能快速开发各种小程序应用。目前发现picker的selector模式只有一级下拉,那么我们是否可以通过3个picker来实现三级联动模板的形式来引入其它页面中呢?答案是肯定可以的。那么我的思路是这样的:
1、使用template模板语法进行封装,数据从页面传入
2、根据picker组件的语法,range只能是一组中文地区数组,但是我们需要每个地区的唯一码来触发下一级联动数据。这样,我的做法是通过一个对象里面的两组数据分表存储中文名和唯一码的两个对象数组。格式【province:{code:['110000', '220000'...], name: ['北京市', '天津市'...]}】,这个格式是固定的,需要服务端配合返回
3、通过picker的bindchange事件来获取下一级的数据,每个方法都写入函数中在暴露出来供页面调用
然后讲下我demo的目录结构:
common
-net.js//wx.request请求接口二次整合
-cityTemplate.js//三级联动方法
page
-demo
-demo.js
-demo.wxml
template
-cityTemplate.wxml
app.js
app.json
app.wxss
然后,使用phpstudy搭建了简单的服务端供测试。不要问我服务端的为啥是这样的,我也不懂,刚入门我只要数据...
当然你可以省掉这一步,将数据直接固定在demo.js里面进行测试...
代码如下:【服务端的返回数据格式是遵循了下面的retArr的规范的】
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<?php
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header("Content-type: text/html; charset=utf-8");
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$type=$_REQUEST["type"];//获取省市区的标志
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$fcode=$_GET["fcode"];
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$retArr=[
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"status"=>true,
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"data"=>[],
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"msg"=>""
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];
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if($type!="province" && $type!="city" && $type!="county"){
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$retArr["status"]=false;
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$retArr["msg"]="获取地区类型错误,请检查";
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echo json_encode($retArr);
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exit;
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}
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function getProvince(){
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$province=[];
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$code=["110000", "350000", "710000"];
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$province["code"]=$code;
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$name=["北京市", "福建省", "台湾省"];
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$province["name"]=$name;
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$fcode=["0", "0", "0"];
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$province["fcode"]=$fcode;
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return $province;
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}
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function getCity($P_fcode){
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$city=[];
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$code=[];
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$name=[];
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$fcode=[];
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if($P_fcode=="110000"){
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$code=["110100"];
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$name=["北京市"];
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$fcode=$P_fcode;
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}
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if($P_fcode=="350000"){
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$code=["350100", "350200", "350300", "350400", "350500", "350600", "350700", "350800", "350900"];
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$name=["福州市", "厦门市", "莆田市", "三明市", "泉州市", "漳州市", "南平市", "龙岩市", "宁德市"];
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$fcode=$P_fcode;
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}
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if($P_fcode=="710000"){
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}
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$city=["code"=>$code, "name"=>$name, "fcode"=>$fcode];
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return $city;
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}
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function getCounty($P_fcode){
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$county=[];
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$code=[];
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$name=[];
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$fcode=[];
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if($P_fcode=="110100"){
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$code=["110101", "110102", "110103", "110104", "110105", "110106", "110107"];
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$name=["东城区", "西城区", "崇文区", "宣武区", "朝阳区", "丰台区", "石景山区"];
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$fcode=$P_fcode;
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}
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if($P_fcode=="350100"){
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$code=["350102", "350103", "350104"];
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$name=["鼓楼区", "台江区", "苍山区"];
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$fcode=$P_fcode;
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}
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if($P_fcode=="350200"){
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$code=["350203", "350205", "350206"];
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$name=["思明区", "海沧区", "湖里区"];
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$fcode=$P_fcode;
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}
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$county=["code"=>$code, "name"=>$name, "fcode"=>$fcode];
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return $county;
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}
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//var_dump($province);
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if($type=="province"){
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$province=getProvince();
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$retArr["data"]=$province;
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}else if($type=="city"){
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$city=getCity($fcode);
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$retArr["data"]=$city;
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}else if($type="county"){
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$county=getCounty($fcode);
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$retArr["data"]=$county;
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}
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echo json_encode($retArr);
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?>
接下来是cityTemplate.wxml:
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<template name="city">
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<view class="areas">
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<view class="province">
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<picker bindchange="provincePickerChange" value="{{provinceIndex}}" range="{{province.name}}" data-city-url="{{cityUrl}}">
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<text class="select-item">{{province.name[provinceIndex]}}</text>
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</picker>
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</view>
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<view class="city">
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<block wx:if="{{!city.name.length}}"> --二级市区-- </block>
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<block wx:if="{{city.name.length>0}}">
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<picker bindchange="cityPickerChange" value="{{cityIndex}}" range="{{city.name}}" data-county-url="{{countyUrl}}">
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<text class="select-item">{{city.name[cityIndex]}}</text>
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</picker>
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</block>
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</view>
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<view class="county">
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<block wx:if="{{!county.name.length}}"> --三级地区-- </block>
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<block wx:if="{{county.name.length>0}}">
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<picker bindchange="countyPickerChange" value="{{countyIndex}}" range="{{county.name}}">
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<text class="select-item">{{county.name[countyIndex]}}</text>
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</picker>
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</block>
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</view>
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</view>
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</template>
cityTemplate.js
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/**
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* 获取三级联动的三个函数
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* that: 注册页面的this实例 必填
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* p_url: 一级省份url 必填
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* p_data:一级省份参数 选填
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*/
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var net = require( "net" );//引入request方法
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var g_url, g_datd, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, g_method;
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function initCityFun( that, p_url, p_data ) {
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//获取一级省份数据
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console.log(p_url+JSON.stringify(p_data));
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g_cbSuccess = function( res ) {
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that.setData( {
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'city.province': res
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});
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};
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net.r( p_url, p_data, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, g_method );
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//点击一级picker触发事件并获取市区方法
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var changeProvince = function( e ) {
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that.setData( {
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'city.city': {},
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'city.county': {},
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'city.provinceIndex': e.detail.value,
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'city.cityIndex': 0,
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'city.countyIndex': 0
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});
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var _fcode = that.data.city.province.code[ e.detail.value ];
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if( !_fcode ) {
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_fcode = 0;
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}
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var _cityUrl = e.target.dataset.cityUrl;
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g_url = _cityUrl + _fcode;
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console.log("province:"+g_url);
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g_cbSuccess = function( res ) {
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console.log(res);
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that.setData( {
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'city.city': res
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});
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}
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net.r( g_url, g_datd, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, g_method );
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};
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that[ "provincePickerChange" ] = changeProvince;
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//点击二级picker触发事件并获取地区方法
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var changeCity = function( e ) {
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that.setData( {
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'city.county': {},
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'city.cityIndex': e.detail.value,
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'city.countyIndex': 0
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});
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var _fcode = that.data.city.city.code[ e.detail.value ];
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if( !_fcode ) {
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_fcode = 0;
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}
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var _countyUrl = e.target.dataset.countyUrl;
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g_url = _countyUrl + _fcode;
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g_cbSuccess = function( res ) {
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that.setData( {
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'city.county': res
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});
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};
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net.r( g_url, g_datd, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, g_method );
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};
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that[ "cityPickerChange" ] = changeCity;
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//点击三级picker触发事件
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var changeCounty = function( e ) {
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that.setData( {
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'city.countyIndex': e.detail.value
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});
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};
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that["countyPickerChange"]=changeCounty;
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}
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function getProvinceFun(that, p_url, p_data){
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g_cbSuccess = function( res ) {
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that.setData( {
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'city.province': res
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});
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};
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net.r( p_url, p_data, g_cbSuccess, g_cbSuccessErr, g_cbFail, g_cbComplete, g_header, g_method );
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}
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module.exports={
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initCityFun: initCityFun,
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getProvinceFun: getProvinceFun
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}
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<style type="text/css">
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p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Times; color: #999999; -webkit-text-stroke: #999999}
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span.s1 {font-kerning: none}
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</style>
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<p class="p1"><span class="s1"><font color="#000000">顺道net.js方法:</font></span></p><p class="p1"><span class="s1">
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</span></p>
核心代码就是上面这三个文件,接下来是demo文件做测试:
demo.wxml:
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<import src="../../template/cityTemplate.wxml"/>
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<template is="city" data="{{...city}}" />
demo.js:
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var city = require( '../../common/cityTemplate' );
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Page( {
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data: {
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},
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onLoad: function( options ) {
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var _that = this;
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//创建三级联动数据对象 ---- 这个city对象是固定的,只有请求的url是根据各自的服务端地址来更改的
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_that.setData( {
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city: {
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province: {},//格式province:{code: ["11000", "12000"], name: ["北京市", "上海市"]},只能固定是name和code,因为模板需要根据这俩参数显示
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city: {},
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county: {},
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provinceIndex: 0,
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cityIndex: 0,
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countyIndex: 0,
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cityUrl: "http://localhost:8282/phpserver/areas.php?type=city&fcode=",//type表示获取地区 fcode是一级code码,到时具体根据后端请求参数修改
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countyUrl: "http://localhost:8282/phpserver/areas.php?type=county&fcode="
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}
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})
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var _url = "http://localhost:8282/phpserver/areas.php";
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var _data = { 'type': 'province', 'fcode': '0' };
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city.initCityFun( _that, _url, _data );
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}
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})
这里存在一个bug,开启下拉刷新和picker组件的下拉会重叠了,不知道是开发工具原因,还是还为修改的bug。。。只能等微信方面更新消息给反馈了
今天更新的0.10.102700这个版本后,发现使用text组件触发不了picker组件了,经过一番测试后需把picker组件内的text标签换成view标签才能正常执行业务。
以上实例的cityTemplate.wxml文件里面text标签请自行更换成view标签。在进行测试~ |