我想在一页上使用 ajax UpdatePanel 和 ICallbackEventHandler。每个都将处理页面的各个部分,它们与每个部分无关。
如果我删除 UpdatePanel,则 ICallbackEventHandler 正在工作。如果我删除 ICallbackEventHandler,更新面板正在工作,但它们完全不工作:(
默认.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default"
EnableEventValidation="false" %>
<!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 runat="server">
<title></title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
</head>
<body>
<script type="text/ecmascript">
function BootX() {
XUpdate();
}
function XUpdate() {
X_CallServer("", "");
}
function X_ReceiveServerData(rValue) {
$("#a").html(rValue);
}
</script>
<form id="form1" runat="server">
<div id="a">
</div>
<asp:ScriptManager runat="server" ID="ScriptManager1" />
<div>
<asp:Timer ID="Timer1" runat="server" Interval="100" OnTick="Timer1_Tick">
</asp:Timer>
<asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional">
<ContentTemplate>
<asp:DropDownList runat="server" ID="ddl">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
<script type="text/ecmascript">
BootX();
</script>
</body>
</html>
和后面的代码:
public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
{
protected void Page_Load(object sender, EventArgs e)
{
String cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "X_ReceiveServerData", "context", true);
String callbackScript = string.Format("function X_CallServer(arg, context)" + "{{ {0} ;}}", cbReference);
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "X_CallServer", callbackScript, true);
ScriptManager1.RegisterAsyncPostBackControl(Timer1);
}
private string result = "";
public void RaiseCallbackEvent(string eventArgument)
{
// pretending some time consuming work
for (int i = 0; i < 1000000; i++) for (int j = 0; j < 100; j++) ;
result = "aaaaaaaaaaaaaaaaaaaaaaaaaaaa";
}
public string GetCallbackResult()
{
return result;
}
protected void Timer1_Tick(object sender, EventArgs e)
{
UpdatePanel1.Update();
Timer1.Enabled = false;
// pretending some time consuming work
for (int i = 0; i < 1000000; i++) for (int j = 0; j < 1000; j++) ;
ddl.Items.Add("Item 1");
ddl.Items.Add("Item 2");
ddl.Items.Add("Item 3");
}
}
上面的代码只是概念。我已经在一个页面上有 5 个使用 ICallbackEventhandler 的控件,它们运行良好,现在我需要向使用 updatepanel 的页面添加一个新控件,它破坏了我所有的其他“ICallbackEventhandler”控件。