功能：
Popupcontrol可以弹出任意类型的控件，不管是在服务器控件还是html控件。就是在某控件获取焦点时弹出另外一个控件，进行一些操作后，隐藏弹出的控件。
属性：
TargetControlID:需要弹出的控件的id
PopupControlID:作为弹出控件的id
Position:弹出控件的位置
OffsetX/OffsetY:弹出控件的位置与默认位置的相对坐标
实例代码：
<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> Enter date for new reminder: <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <asp:Panel ID="Panel1" runat="server"> <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:Calendar ID="Calendar1" runat="server" BackColor="White" BorderColor="#999999" CellPadding="4" DayNameFormat="Shortest" Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" Height="180px" Width="200px" OnSelectionChanged="Calendar1_SelectionChanged"> <selecteddaystyle backcolor="#666666" font-bold="True" forecolor="White" /> <selectorstyle backcolor="#CCCCCC" /> <weekenddaystyle backcolor="#FFFFCC" /> <todaydaystyle backcolor="#CCCCCC" forecolor="Black" /> <othermonthdaystyle forecolor="#808080" /> <nextprevstyle verticalalign="Bottom" /> <dayheaderstyle backcolor="#CCCCCC" font-bold="True" font-size="7pt" /> <titlestyle backcolor="#999999" bordercolor="Black" font-bold="True" /> </asp:Calendar> </ContentTemplate> </asp:UpdatePanel> </asp:Panel> <br /> <br /> Reminder message: <asp:TextBox ID="MessageTextBox" runat="server" Width="200" autocomplete="off" /><br /><br /> <asp:Panel ID="Panel2" runat="server" CssClass="popupControl"> <div style="border: 1px outset white; 100px"> <asp:UpdatePanel runat="server" ID="up2"> <ContentTemplate> <asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged"> <asp:ListItem Text="Walk dog" /> <asp:ListItem Text="Feed dog" /> <asp:ListItem Text="Feed cat" /> <asp:ListItem Text="Feed fish" /> <asp:ListItem Text="Cancel" Value="" /> </asp:RadioButtonList> </ContentTemplate> </asp:UpdatePanel> </div> </asp:Panel> <ajaxToolkit:PopupControlExtender ID="PopupControlExtender2" runat="server" TargetControlID="MessageTextBox" PopupControlID="Panel2" CommitProperty="value" Position="Bottom" CommitScript="e.value += ' - do not forget!';" /> <ajaxToolkit:PopupControlExtender ID="PopupControlExtender1" runat="server" TargetControlID="TextBox1" PopupControlID="Panel1" Position="Right"> </ajaxToolkit:PopupControlExtender> </form></body></html>后台 添加点击 Calendar和RadioButtonList的OnSelectedIndexChanged事件。
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
this.TextBox1.Text = this.Calendar1.SelectedDate.ToShortDateString(); PopupControlExtender1.Commit(this.TextBox1.Text);
} protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e) { if (!string.IsNullOrEmpty(RadioButtonList1.SelectedValue))
{
// 这里需要注意，执行选择操作 PopupControlExtender2.Commit(RadioButtonList1.SelectedValue);
} else { // 取消操作 PopupControlExtender2.Cancel(); } }运行结果：
