本文实例讲述了微信小程序实现的picker多级联动功能。分享给大家供大家参考，具体如下：
wxml部分：
<picker
mode="multiSelector"
bindchange="bindjobcatchange"
bindcolumnchange="bingjobcatcolumnchange"
value="{{multiIndex}}"
range="{{job_cat_list}}"
range-key="{{'cat_name'}}"
>
<view class="picker">
{{fenlei_title}}
</view>
</picker>
js部分：
Page({
data: {
server_url: app.globalData.URL,
fenlei_title:'分类',
job_cat_list:[],
multiIndex: [0,0,0],
filter:{
keywords:'',
job_cat_id:''
}
},
onLoad: function () {
this.jobcat();
},
jobcat: function() {
var that = this;
wx.request({
url: app.globalData.URL + "/xxx/eeee",
data: {
x: '',
y: ''
},
header: {
'content-type': 'application/json' // 默认值
},
success: function (res) {
var data = res.data.data;
that.setData({
job_cat_list: [data, data[0]['children'], data[0]['children'][0]['children']]
});
}
});
},
bindjobcatchange: function(e){
this.setData({multiIndex:e.detail.value})
},
bingjobcatcolumnchange: function(e){
var index = this.data.multiIndex;
const data = {
job_cat_list: this.data.job_cat_list,
multiIndex: this.data.multiIndex
}
this.data.multiIndex[e.detail.column] = e.detail.value;
if (e.detail.column==0){
data.job_cat_list[1] = this.data.job_cat_list[0][index[0]]['children'];
data.job_cat_list[2] = data.job_cat_list[1][index[1]]['children'];
}else if(e.detail.column===1){
data.job_cat_list[2] = data.job_cat_list[1][index[1]]['children'];
this.data.filter.job_cat_id = data.job_cat_list[2][index[2]]['cat_name'];
}else if(e.detail.column===2){
this.data.filter.job_cat_id=data.job_cat_list[2][e.detail.value]['cat_name'];
}
this.setData(data)
}
})
php后台部分：
public function jobcate(){
$zp_job_catModel = new ZpJobCat();
$job_cat = $zp_job_catModel->getcateAll();
$i=0;
$return_data = [];
foreach ($job_cat as $key=>$val){
$return_data[$i] = $val;
$return_data[$i]['children'] = [];
if (!empty($val['children'])){
$c=0;
foreach ($val['children'] as $k=>$v){
$return_data[$i]['children'][$c] = $v;
if (!empty($v['children'])){
$return_data[$i]['children'][$c]['children'] = [];
$m=0;
foreach ($v['children'] as $val2){
$return_data[$i]['children'][$c]['children'][$m] = $val2;
$m++;
}
}
$c++;
}
}
$i++;
}
$this->_success($return_data);
}
另外，本站在线工具小程序上的天气查询、车牌号归属地查询以及阴历阳历转换等工具就采用了联动查询功能，感兴趣的朋友可以扫描如下小程序码查看：
希望本文所述对大家微信小程序开发有所帮助。