微信小程序下拉框组件使用方法

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>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>三、性别选择<picker bindchange="bindViewEvent" data-model="component" data-method="bindSelect" data-name="index" value='{{index}}' range="{{gender}}"><view>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);}相关js类//component.jsconst 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.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; } /* * 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;以上就是微信小程序下拉框组件使用方法的详细内容，更多请关注小潘博客其它相关文章！