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" 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"> <tr bgcolor="#a4b6d7"> <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"> <td height="22" width="50%"> <img id="img<%#Eval("BigClassID")%>" src="Image/tree_folder4.gif" width="15" height="15"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")%>'>删除一级版块</a></td> </tr> <tr bgcolor="ECF5FF" 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"> </HeaderTemplate> <ItemTemplate> <tr id="smallimg<%#Eval("BigClassID")%>" bgcolor="#E3E3E3"> <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")%>'>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" 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"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")%>'>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。