一个简单页面回调的代码,照书抄的,但怎么也运行不了,错在哪里呢?

zhangns 2008-11-13 03:14:11

前台页面:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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>无标题页</title>

<script type="text/javascript">
function GetNumber()
{
UseCallback();
alert("aa");
}

function GetRandomNumberFromServer(TextBox1,context)
{
document.forms[0].TextBox1.value=TextBox1;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="Button1" type="button" value="button" onclick="GetNumber()" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</div>
</form>

</body>
</html>

后台页面:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page, System.Web.UI.ICallbackEventHandler
{
private string _callbackResult = null;

protected void Page_Load(object sender, EventArgs e)
{
string cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "GetRandomNumberFromServer", "context");
string cbScript = "function UseCallback(arg,context)" + "{" + cbReference + ";" + "}";

Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "UseCallback", cbReference, true);
}

public void RaiseCallbackEvent(string eventArg)
{
Random rnd = new Random();
_callbackResult = rnd.Next().ToString();
}

public string GetCallbackResult()
{
return _callbackResult;
}
}

运行时报错:
行:53
Char:1
错误 :"arg"未定义
代码:0

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jiezi316 2008-11-13

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用ajax.net pro吧，比这个用起来方便

andrewsway 2008-11-13

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<script language="javascript" type="text/javascript">

    <!--

    function CallServer(inputcontrol, context) {

        context.innerHTML = '<IMG SRC="images/001.gif" />';

        arg = inputcontrol.value;

        <%= ClientScript.GetCallbackEventReference(this, "arg", "ReceiveServerData", "context")%>;

    }

    function ReceiveServerData(result, context) {

        context.innerHTML = result;

    }   

    //-->

    </script>



<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

        <input id="Button1" type="button" value="button" onclick="CallServer(TextBox1, Label1);" />

        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>



    string ICallbackEventHandler.GetCallbackResult()

    {

        // throw new Exception("The method or operation is not implemented.");

        System.Threading.Thread.Sleep(1000);

        return "输入字符串：" + result;

    }



    void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)

    {

        // throw new Exception("The method or operation is not implemented.");

        result = eventArgument;

    }