微信小程序 下拉菜单简单实例
wcss
/**DropDownMenu**/ /*总菜单容器*/ .menu { display: block; height: 28px; position: relative; } /*一级菜单*/ .menu dt { font-size: 15px; float: left; /*hack*/ width: 33%; height: 38px; border-right: 1px solid #d2d2d2; border-bottom: 1px solid #d2d2d2; text-align: center; background-color: #f4f4f4; color: #5a5a5a; line-height: 38px; z-index: 2; } /*二级菜单外部容器样式*/ .menu dd { position: absolute; width: 100%; margin-top: 40px; left: 0; z-index: -99; } /*二级菜单普通样式*/ .menu li { font-size: 14px; line-height: 34px; color: #575757; height: 34px; display: block; padding-left: 8px; background-color: #fff; border-bottom: 1px solid #dbdbdb; } /*二级菜单高亮样式*/ .menu li.highlight { background-color: #f4f4f4; color: #48c23d; } /* 显示与隐藏 */ .show { /*display: block;*/ visibility: visible; } .hidden { /*display: none;*/ visibility: hidden; }
wxml
<dl> <block wx:for="{{reportData}}" wx:key="idMenu" wx:for-item="menuItem" wx:for-index="idMenu"> <dt data-index="{{idMenu}}" bindtap="tapMainMenu">{{menuItem.reportType}}</dt> <dd animation="{{animationData[idMenu]}}"> <ul wx:for="{{menuItem.chilItem}}" wx:key="chilItem.ID" wx:for-item="chilItem" wx:for-index="idChil"> <li bindtap="tapSubMenu" data-index="{{idMenu}}-{{idChil}}">{{chilItem.Name}}</li> </ul> <picker mode="date" value="{{dateValue}}" bindchange="datePickerBindchange" start="1999-01-01" end="2999-12-12"> 时间：{{dateValue}}</picker> </dd> </block> </dl>
js
//数据源 var ReportDataSync = [ { reportType: "日报1", chilItem: [ { ID: 1, Name: "日报1", ReportUrl: "DailyReport.aspx", Type: 1 }, { ID: 2, Name: "日报2", ReportUrl: "DailyReport.aspx", Type: 1 }, { ID: 3, Name: "日报3", ReportUrl: "DailyReport.aspx", Type: 1 }] }, { reportType: "目录2", chilItem: [ { ID: 1, Name: "目录1", ReportUrl: "DailyReport.aspx", Type: 2 }, { ID: 2, Name: "目录2", ReportUrl: "DailyReport.aspx", Type: 2 }, { ID: 3, Name: "目录3", ReportUrl: "DailyReport.aspx", Type: 2 }, { ID: 4, Name: "目录4", ReportUrl: "DailyReport.aspx", Type: 2 }] }, { reportType: "月报3", chilItem: [ { ID: 1, Name: "月报1", ReportUrl: "DailyReport.aspx", Type: 1 }, { ID: 2, Name: "月报2", ReportUrl: "DailyReport.aspx", Type: 2 }] } ] //定义字段 var initSubMenuDisplay = [] var initSubMenuHighLight = [] var initAnimationData = [] /// 初始化DropDownMenu loadDropDownMenu() that.setData({ reportData: ReportDataSync,//菜单数据 subMenuDisplay: initSubMenuDisplay, //一级 subMenuHighLight: initSubMenuHighLight, //二级 animationData: initAnimationData //动画 }) //一级菜单点击 tapMainMenu: function (e) { //获取当前一级菜单标识 var index = parseInt(e.currentTarget.dataset.index); //改变显示状态 for (var i = 0; i < initSubMenuDisplay.length; i++) { if (i == index) { if (this.data.subMenuDisplay[index] == "show") { initSubMenuDisplay[index] = 'hidden' } else { initSubMenuDisplay[index] = 'show' } } else { initSubMenuDisplay[i] = 'hidden' } } this.setData({ subMenuDisplay: initSubMenuDisplay }) this.animation(index) }, //二级菜单点击 tapSubMenu: function (e) { //隐藏所有一级菜单 //this.setData({ //subMenuDisplay: initSubMenuDisplay() //}); // 当前二级菜单的标识 var indexArray = e.currentTarget.dataset.index.split('-'); // 删除所在二级菜单样式 for (var i = 0; i < initSubMenuHighLight.length; i++) { if (indexArray[0] == i) { for (var j = 0; j < initSubMenuHighLight[i].length; j++) { initSubMenuHighLight[i][j] = ''; } } } //给当前二级菜单添加样式 initSubMenuHighLight[indexArray[0]][indexArray[1]] = 'highlight'; //刷新样式 this.setData({ subMenuHighLight: initSubMenuHighLight }); // 设置动画 this.animation(indexArray[0]); }, //菜单动画 animation: function (index) { // 定义一个动画 var animation = wx.createAnimation({ duration: 400, timingFunction: 'linear', }) // 是显示还是隐藏 var flag = this.data.subMenuDisplay[index] == 'show' ? 1 : -1; // 使之Y轴平移 animation.translateY(flag * ((initSubMenuHighLight[index].length + 1) * 38)).step(); // 导出到数据，绑定给view属性 var animationStr = animation.export(); // 原来的数据 var animationData = this.data.animationData; animationData[index] = animationStr; this.setData({ animationData: animationData }); } /// <summary> /// 初始化DropDownMenu /// 1.一级目录 initSubMenuDisplay ：['hidden'] /// 2.二级目录 initSubMenuHighLight ：[['',''],['','','','']]] /// </summary> function loadDropDownMenu() { for (var i = 0; i < ReportDataSync.length; i++) { //一级目录 initSubMenuDisplay.push('hidden') //二级目录 var report = [] for (var j = 0; j < ReportDataSync[i].chilItem.length; j++) { report.push(['']) } initSubMenuHighLight.push(report) //动画 initAnimationData.push("") } }