<%@ Page Language="C#" AutoEventWireup="true" Title="DynamicPopulate Sample"%> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %> <script runat="server"> [System.Web.Services.WebMethod] [System.Web.Script.Services.ScriptMethod] public static string GetHtml(string contextKey) { // A little pause to mimic a latent call System.Threading.Thread.Sleep(250); string value = (contextKey == "U") ? DateTime.UtcNow.ToString() : String.Format("{0:" + contextKey + "}", DateTime.Now); return String.Format("<span style='font-family:courier new;font-weight:bold;'>{0}</span>", value); } </script> <!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>Dynamic Populate 2</title> </head> <body> <form id="form1" runat="server"> <ajaxToolkit:ToolkitScriptManager runat="Server" ID="ScriptManager1" /> <script type="text/javascript"> function updateDateKey(value) { var behavior = $find('dp1'); if (behavior) { behavior.populate(value); } } Sys.Application.add_load(function () { updateDateKey('G'); }); </script> <div class="demoarea"> <p> <asp:Label ID="Label1" runat="server" Text="Label" CssClass="subheading">Time at the server:</asp:Label> </p> <p>Choose a date/time format:</p> <p> <label for="r0"> <input type="radio" name="rbFormat" id="r0" value='G' onclick="updateDateKey(this.value);" checked="checked" />Normal </label> <br /> <label for="r1"> <input type="radio" name="rbFormat" id="r1" value='d' onclick="updateDateKey(this.value);" /> Short Date </label> <br /> <label for="r2"> <input type="radio" name="rbFormat" id="r2" value='D' onclick="updateDateKey(this.value);" />Long Date </label> <br /> <label for="r3"> <input type="radio" name="rbFormat" id="r3" value='U' onclick="updateDateKey(this.value);" />UTC Date/Time </label> <br /> </p> <br /> <asp:Panel ID="Panel1" runat="server" CssClass="dynamicPopulate_Normal" /> <ajaxToolkit:DynamicPopulateExtender ID="dp1" runat="server" TargetControlID="Panel1" PopulateTriggerControlID="Label1" ServiceMethod="GetHtml" /> </div> </form> </body> </html>
要特别注意添加DynamicPopulateExtender的PopulateTriggerControlID 属性。 如果没有添加PopulateTriggerControlID 属性，页面会一直报错——
Can't find control with ID ''。
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