微信小程序下拉框组件使用方法

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我是靠谱客的博主感性小猫咪，最近开发中收集的这篇文章主要介绍微信小程序下拉框组件使用方法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

这篇文章主要为大家详细介绍了微信小程序下拉框组件的使用方法，写的十分的全面细致，具有一定的参考价值，对此有需要的朋友可以参考学习下。如有不足之处，欢迎批评指正。【推荐教程：小程序开发教程】

适用场景

1、省市三级联动
2、出生日期选择
3、性别选择
4、一般性的下拉选择等

一、省市三级联动使用

注意mode = region，以及value = “一维数组”

//.wxml
<picker mode="region" bindchange="bindViewEvent" data-model="component"
data-method="bindSelect" data-name="region" value="{{region}}" custom-item="{{customItem}}">
<view class="picker">
   当前选择：{{region[0]}}，{{region[1]}}，{{region[2]}}
</view>
</picker>
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二、出生日期选择

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>
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三、性别选择

<picker bindchange="bindViewEvent" data-model="component" data-method="bindSelect" data-name="index" value='{{index}}' range="{{gender}}">
  <view class="label-right">
    {{gender[index]}}
  </view>
</picker>
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以上都需要在.js里设置相关初始变量！

var app = getApp();
 data: {
  region:['湖南','长沙','岳麓'],
  date:'2010-10-10',
  gender:['男','女'],
  index:0
 }
 bindViewEvent:function(e){
  app.process(this,e);  
 }
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相关js类

//component.js
const select = require('../component/select.js');
const upload = require('../component/upload.js');
class component{
 constructor(com, that) {
  this.com = com;
  this.that = that;
 }
 //绑定下拉框选择事件
 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);
 }
 //点击事件，传递参数为e.currentTarget.dataset
 bindImageChoose(data){
  //图片上传
  this.uploader = new upload({
   that: that,
   name: data.name,
   mode: data.mode,
   count: data.count || 9
  });
  this.uploader.choose();
 }
 bindImageDel(data){
  //图片上传
  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
/*
* 下拉框对象
*/
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.js
class 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;
 }
 /*
 * 选择图片
 */
 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);
   }
  })
 }
 /*
 * 显示图片
 */
 show() {
  let self = this;
  let view = {};
  view[self.name] = self.that.data[self.name];
  self.that.setData(view);
 }
 /*
 * 追加图片
 */
 append(data) {
  const self = this;
  for (let i = 0; i < data.length; i++) {
   self.that.data[self.name].push(data[i]);
  }
  self.show();
 }
 /*
 * 删除图片
 */
 del(index) {
  let self = this;
  self.that.data[self.name].splice(index, 1);
  self.show();
 }
}
module.exports = picUploader;
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