微信小程序 下拉菜單簡單實例

wcss 

/**DropDownMenu**/  /*總菜單容器*/  .menu {  display: block;  height: 28px;  position: relative; }  /*一級菜單*/  .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; }  /*二級菜單外部容器樣式*/  .menu dd {  position: absolute;  width: 100%;  margin-top: 40px;  left: 0;  z-index: -99; }  /*二級菜單普通樣式*/  .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; }  /*二級菜單高亮樣式*/  .menu li.highlight {  background-color: #f4f4f4;  color: #48c23d; }  /* 顯示與隱藏 */  .show {  /*display: block;*/  visibility: visible; }  .hidden {  /*display: none;*/  visibility: hidden; } 

wxml  

<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"> 時間：{{dateValue}}</picker>    </dd>   </block> </dl> 

js 

//數據源 var ReportDataSync = [   {     reportType: "日報1",     chilItem: [       { ID: 1, Name: "日報1", ReportUrl: "DailyReport.aspx", Type: 1 },       { ID: 2, Name: "日報2", ReportUrl: "DailyReport.aspx", Type: 1 },       { ID: 3, Name: "日報3", ReportUrl: "DailyReport.aspx", Type: 1 }]   },   {     reportType: "目錄2",     chilItem: [       { ID: 1, Name: "目錄1", ReportUrl: "DailyReport.aspx", Type: 2 },       { ID: 2, Name: "目錄2", ReportUrl: "DailyReport.aspx", Type: 2 },       { ID: 3, Name: "目錄3", ReportUrl: "DailyReport.aspx", Type: 2 },       { ID: 4, Name: "目錄4", ReportUrl: "DailyReport.aspx", Type: 2 }]   },   {     reportType: "月報3",     chilItem: [       { ID: 1, Name: "月報1", ReportUrl: "DailyReport.aspx", Type: 1 },       { ID: 2, Name: "月報2", ReportUrl: "DailyReport.aspx", Type: 2 }]   } ]  //定義字段 var initSubMenuDisplay = []  var initSubMenuHighLight = [] var initAnimationData = []  /// 初始化DropDownMenu loadDropDownMenu()  that.setData({   reportData: ReportDataSync,//菜單數據   subMenuDisplay: initSubMenuDisplay, //一級   subMenuHighLight: initSubMenuHighLight, //二級    animationData: initAnimationData //動畫 })    //一級菜單點擊 tapMainMenu: function (e) {   //獲取當前一級菜單標識   var index = parseInt(e.currentTarget.dataset.index);   //改變顯示狀態   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) },  //二級菜單點擊 tapSubMenu: function (e) {   //隱藏所有一級菜單   //this.setData({   //subMenuDisplay: initSubMenuDisplay()   //});   // 當前二級菜單的標識   var indexArray = e.currentTarget.dataset.index.split('-');    // 刪除所在二級菜單樣式   for (var i = 0; i < initSubMenuHighLight.length; i++) {     if (indexArray[0] == i) {       for (var j = 0; j < initSubMenuHighLight[i].length; j++) {         initSubMenuHighLight[i][j] = '';       }     }   }   //給當前二級菜單添加樣式   initSubMenuHighLight[indexArray[0]][indexArray[1]] = 'highlight';   //刷新樣式   this.setData({     subMenuHighLight: initSubMenuHighLight   });    // 設置動畫    this.animation(indexArray[0]); },  //菜單動畫 animation: function (index) {     // 定義一個動畫    var animation = wx.createAnimation({      duration: 400,     timingFunction: 'linear',   })   // 是顯示還是隱藏   var flag = this.data.subMenuDisplay[index] == 'show' ? 1 : -1;   // 使之Y軸平移   animation.translateY(flag * ((initSubMenuHighLight[index].length + 1) * 38)).step();   // 導出到數據，綁定給view屬性    var animationStr = animation.export();   // 原來的數據    var animationData = this.data.animationData;   animationData[index] = animationStr;   this.setData({     animationData: animationData   }); }   /// <summary> /// 初始化DropDownMenu /// 1.一級目錄 initSubMenuDisplay ：['hidden'] /// 2.二級目錄 initSubMenuHighLight ：[['',''],['','','','']]] /// </summary> function loadDropDownMenu() {   for (var i = 0; i < ReportDataSync.length; i++) {     //一級目錄     initSubMenuDisplay.push('hidden')     //二級目錄     var report = []     for (var j = 0; j < ReportDataSync[i].chilItem.length; j++) {       report.push([''])     }     initSubMenuHighLight.push(report)        //動畫     initAnimationData.push("")   } }