如何添加子下拉菜单

Question

我在HTML一个初学者，需要从你们

一些帮助，我想补充子下拉菜单，在教程下拉菜单中，我有三个主要的下拉菜单，分别是：HTML5，CSS ，JQuery的

现在我想显示两个子菜单即：在HTML 5下拉菜单下载和视频

<div class="collapse navbar-collapse navbar-right navbar-main-collapse"> 
<ul class="nav navbar-nav"> 
    <li class="active"><a href="#intro">Home</a></li> 
    <li><a href="#about">About</a></li> 
    <li><a href="#service">Service</a></li> 
    <li><a href="#contact">Contact</a></li> 
    <li class="dropdown"> 
    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Tutorials<b class="caret"></b></a> 
    <ul class="dropdown-menu"> 
    <li><a href="#">HTML 5</a></li> 
     <!-- here i would like to show two sub dropdown menus, first Downlo ads and second Videos --> 
    <li><a href="#">CSS</a></li> 
    <li><a href="#">JQuery</a></li> 
    </ul> 
</li> 
</ul> 
</div> 

Answer 1

你将不得不使用与SelectedIndexChanged事件另一个下拉时触发第二dropdownlist.Something像这样：

<asp:DropDownList ID="DropDownList1" runat="server" onselectedindexchanged="DropDownList1_SelectedIndexChanged" Width="224px" 
    AutoPostBack="True" AppendDataBoundItems="true"> 
<asp:DropDownList ID="DropDownList2" runat="server" 
    onselectedindexchanged="DropDownList2_SelectedIndexChanged"> 
</asp:DropDownList> 


protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) 
{ 
//Load DropDownList2 

} 

由于您还没有发布您的代码，couldnt帮助你更多。