微信小程序 下拉菜单简单实例

/**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; } 

<dl class="menu">   <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 class="{{subMenuDisplay[idMenu]}}" animation="{{animationData[idMenu]}}">     <ul wx:for="{{menuItem.chilItem}}" wx:key="chilItem.ID" wx:for-item="chilItem" wx:for-index="idChil">      <li class="{{subMenuHighLight[idMenu][idChil]}}" bindtap="tapSubMenu" data-index="{{idMenu}}-{{idChil}}">{{chilItem.Name}}</li>     </ul>     <picker class="timePicker" mode="date" value="{{dateValue}}" bindchange="datePickerBindchange" start="1999-01-01" end="2999-12-12"> 时间：{{dateValue}}</picker>    </dd>   </block> </dl> 

//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("")   } }