AjaxDropDownExtender

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>DropDownExtender简单练习</title>
<style type="text/css">
#Panel1
{
background:#ffcc00;
font-size:12px;
padding:0px;
border:solid 1px;
}
#LinkButton1,#LinkButton2,#LinkButton3,#LinkButton4
{
color:#666;
font-size:12px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
</div>
<br />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="Label2" runat="server" Text="Label" Width="129px"></asp:Label><br />
<br />
<asp:Label ID="Label1" runat="server" Text="请选择" Width="91px"></asp:Label>
<asp:Panel ID="Panel1" runat="server" Width="85px" Style="visibility: hidden">
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="lkbtn_Click">西安</asp:LinkButton><br />
<asp:LinkButton ID="LinkButton2" runat="server" OnClick="lkbtn_Click">上海</asp:LinkButton><br />
<asp:LinkButton ID="LinkButton3" runat="server" OnClick="lkbtn_Click">深圳</asp:LinkButton><br />
<asp:LinkButton ID="LinkButton4" runat="server" OnClick="lkbtn_Click">北京</asp:LinkButton></asp:Panel>
<cc1:DropDownExtender ID="DropDownExtender1" runat="server" DropDownControlID="Panel1"
TargetControlID="Label1">
</cc1:DropDownExtender>
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
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原文地址:https://www.cnblogs.com/qq4004229/p/1994118.html