本文實例為大家分享了微信小程序下拉框組件的使用方法，供大家參考，具體內容如下

適用場景

1、省市三級聯動
2、出生日期選擇
3、性別選擇
4、一般性的下拉選擇等

一、省市三級聯動使用

注意mode = region，以及value = “一維數組”

//.wxml<picker mode="region" bindchange="bindViewEvent" data-model="component" data-method="bindSelect" data-name="region" value="{{region}}" custom-item="{{customItem}}"><view class="picker">   當前選擇：{{region[0]}}，{{region[1]}}，{{region[2]}}</view></picker>

二、出生日期選擇

注意mode = date，以及value = “日期字符串”

<picker mode="date" value="{{date}}" start="2015-09-01" end="2017-09-01" bindchange="bindViewEvent" data-model="component" data-method="bindSelect" date-mode="date" data-name="date">  <view class="picker">  {{date}}  </view></picker>

三、性別選擇

注意，不填mode默認為selector，range=”一維數組”，value=”當前選中索引”

<picker bindchange="bindViewEvent" data-model="component" data-method="bindSelect" data-name="index" value='{{index}}' range="{{gender}}">  <view class="label-right">    {{gender[index]}}  </view></picker>

以上都需要在.js里設置相關初始變量！

//.js var app = getApp(); data: {  region:['河北','滄州','河間'],  date:'2010-10-10',  gender:['男','女'],  index:0 }, bindViewEvent:function(e){  app.process(this,e);   }

相關js類

//component.jsconst select = require('../component/select.js');const upload = require('../component/upload.js');class component{ constructor(com, that) {  this.com = com;  this.that = that; } //綁定下拉框選擇事件 bindSelect(data){  let self = this;  let mode = data.currentTarget.dataset.mode;  let name = data.currentTarget.dataset.name;  let picker = new select({   that: self.that,   mode: mode,   name: name  });  picker.change(data.detail.value); } //點擊事件，傳遞參數為e.currentTarget.dataset bindImageChoose(data){  //圖片上傳  this.uploader = new upload({   that: that,   name: data.name,   mode: data.mode,   count: data.count || 9  });  this.uploader.choose(); } bindImageDel(data){  //圖片上傳  this.uploader = new upload({   that: that,   name: data.name,   mode: data.mode,   count: data.count || 9  });  this.uploader.del(data.index); }}module.exports = component;//select.js/** 下拉框對象*/class picker{ constructor(data){  this.that = data.that;  this.name = data.name || 'date';  this.mode = data.mode || 'selector'; } show(name,data){  let view = {};  view[name] = data;  this.that.setData(view); } change(data){  let self = this;  self.show(self.name, data); }}module.exports = picker;//upload.jsclass picUploader { constructor(data) {  this.that = data.that;  this.name = data.name;  this.mode = data.mode || 1;  this.count = this.model == 1 ? 1 : data.count || 9; } /* * 選擇圖片 */ choose() {  const self = this;  wx.chooseImage({   count: (self.count - self.that.data[self.name].length),   sizeType: ['original', 'compressed'],   sourceType: ['album', 'camera'],   success: function (res) {    var tempFilePaths = res.tempFilePaths;    self.append(tempFilePaths);   }  }) } /* * 顯示圖片 */ show() {  let self = this;  let view = {};  view[self.name] = self.that.data[self.name];  self.that.setData(view); } /* * 追加圖片 */ append(data) {  const self = this;  for (let i = 0; i < data.length; i++) {   self.that.data[self.name].push(data[i]);  }  self.show(); } /* * 刪除圖片 */ del(index) {  let self = this;  self.that.data[self.name].splice(index, 1);  self.show(); }}module.exports = picUploader;