本文实例讲述了C#实现DataList里面嵌套DataList的折叠菜单。分享给大家供大家参考，具体如下：
点击前效果图如下：
点击后效果图如下：
具体实现代码如下：
Javascript脚本
<script type="text/javascript">function showmenu(id){smallimg = eval("smallimg"+id);img =eval("img"+id);if(smallimg.style.display =="none"){ eval("smallimg"+id+".style.display=\"\";");//全部显示img.src="Image/tree_folder3.gif";//显示为-}else{eval("smallimg"+id+".style.display=\"none\";"); //全部隐藏img.src="Image/tree_folder4.gif";//显示为+}}</script>HTML代码如下：
<body><form id="Form1" method="post" runat="server"><font face="宋体"></font><table width="679" height="100%" border="0" cellpadding="0" cellspacing="0" align="center"><tr><td align="center" valign="top"><strong>版块 设 置</strong><br /><br />管理选项：<asp:Button ID="btnAdd" runat="server"OnClick="btnAdd_Click" Text="添加一级版块"/><br /><br /><asp:DataList ID="DataList1" runat="server" CellSpacing="0" CellPadding="0" Width="679"OnItemDataBound="DataList1_ItemDataBound"><HeaderTemplate><table width="679" border="0" cellpadding="0" cellspacing="0" bgcolor="#000000" class="border"><tr bgcolor="#a4b6d7" class="title"><td height="25" align="center"><strong>版块名称</strong></td><td height="20" align="center"><strong>操作选项</strong></td></tr></HeaderTemplate><ItemTemplate><tr bgcolor="ECF5FF" class="tdbg"><td height="22" width="50%"><img id="img<%#Eval("BigClassID")%>" src="Image/tree_folder4.gif" width="15" height="15" onclick="showmenu(<%#Eval("BigClassID")%>)"><%#Eval("BigClassName")%></td><td align="center" width="50%"><a href='SmallClassAdd.aspx?BigClassID=<%#Eval("BigClassID")%>'>添加二级版块</a> | <a href='BigClassModify.aspx?BigClassID=<%#Eval("BigClassID")%>'>修改一级版块</a> | <a href='BigClassDelete.aspx?BigClassID=<%#Eval("BigClassID")%>'onclick="return confirm('确定删除吗,下级版块及相关帖子都将被删除,且不可恢复!!!')">删除一级版块</a></td></tr><tr bgcolor="ECF5FF" class="tdbg" width="100%"><td colspan="2" width="100%"><asp:DataList ID='dlstSmallClass' EnableViewState='false' runat='server'><HeaderTemplate><table width="679" border="0" cellpadding="0" cellspacing="0" bgcolor="#000000" class="border"></HeaderTemplate><ItemTemplate><tr id="smallimg<%#Eval("BigClassID")%>" style="display:none" bgcolor="#E3E3E3" class="tdbg"><td height="22" width="50%" colspan="3"> <img src="Image/tree_folder3.gif" width="15" height="15"><%#Eval("SmallClassName")%></td><td align="center" width="50%" colspan="3"> <a href='SmallClassModify.aspx?SmallClassID=<%#Eval("SmallClassID")%>'>修改二级版块</a> | <a href='SmallClassDelete.aspx?SmallClassID=<%#Eval("SmallClassID")%>'onclick="return confirm('确定删除吗,相关帖子都将被删除,且不可恢复!!!')">删除二级版块</a></td></tr></ItemTemplate><FooterTemplate></table></FooterTemplate></asp:DataList></td></tr></ItemTemplate><FooterTemplate></table></FooterTemplate></asp:DataList></td></tr></table></form></body>上面的功能有点缺陷（ques1:多行时候不能折叠，默认只折叠第一行；ques2:不支持IE），现在改善如下：
<script type="text/javascript">function showmenu(id){var smallimg = document.getElementById("smallimg"+id);var img = document.getElementById("img"+id);if(smallimg.style.display =="none"){ smallimg.style.display="";img.src="Image/tree_folder3.gif";//显示为-}else{smallimg.style.display ="none";img.src="Image/tree_folder4.gif";//显示为+}}</script><body><form id="Form1" method="post" runat="server"><font face="宋体"></font><table width="679" height="100%" border="0" cellpadding="0" cellspacing="0" align="center"><tr><td align="center" valign="top"><strong>版 块 设 置</strong><br /><br />管理选项：<asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click" Text="添加一级版块"/><br /><br /><asp:DataList ID="DataList1" runat="server" CellSpacing="0" CellPadding="0" Width="679"OnItemDataBound="DataList1_ItemDataBound"><HeaderTemplate><table width="679" border="0" cellpadding="0" cellspacing="0" bgcolor="#000000"class="border"><tr bgcolor="#a4b6d7"class="title"><td height="25" align="center"><strong>版块名称</strong></td><td height="20" align="center"><strong>操作选项</strong></td></tr></HeaderTemplate><ItemTemplate><tr bgcolor="ECF5FF"class="tdbg"><td height="22" width="50%"><img id="img<%#Eval("BigClassID")%>" src="Image/tree_folder4.gif" width="15" height="15"onclick="showmenu(<%#Eval("BigClassID")%>)"><%#Eval("BigC <td align="center" width="50%" colspan="3"> <a href='SmallClassModify.aspx?SmallClassID=<%#Eval("SmallClassID")%>'>修改二级版块</a>|<a href='SmallClassDelete.aspx?SmallClassID=<%#Eval("SmallClassID")%>'onclick="return confirm('确定删除吗,相关帖子都将被删除,且不可恢复!!!')">删除二级版块</a></td></tr></ItemTemplate><FooterTemplate></table></FooterTemplate></asp:DataList></td></tr></ItemTemplate><FooterTemplate></table></FooterTemplate></asp:DataList></td></tr></table></form></body>希望本文所述对大家C#程序设计有所帮助。
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