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如何在无刷新页面的情况下实现客户端回调实例（…

2008-02-23 05:43:16来源：互联网阅读 ()

经常在网上找各种各样的资料看，来解决某一具备针对性的问题，可是最终发现还是MSDN好，可惜大部分没有汉化，而且实例型的资料并不是很多，但不管怎么说MSDN还是需要我们认真学习的！
<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="ClientCallback.aspx.cs" Inherits="ClientCallback" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<script type="text/javascript">
function LookUpStock()
{
var lb = document.forms[0].ListBox1;
var product = lb.options[lb.selectedIndex].text
CallServer(product, "");
}

function ReceiveServerData(rValue)
{
Results.innerText = rValue;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="ListBox1" Runat="server"></asp:ListBox>
<br />
<br />
<button onclick="LookUpStock()">Look Up Stock</button>
<br />
<br />
Items in stock: <span ID="Results"></span>
<br />
</div>
</form>
</body>
</html>

1 using System;
2 using System.Data;
3 using System.Configuration;
4 using System.Collections;
5 using System.Web;
6 using System.Web.Security;
7 using System.Web.UI;
8 using System.Web.UI.WebControls;
9 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11
12 public partial class ClientCallback : System.Web.UI.Page,
13 System.Web.UI.ICallbackEventHandler
14 {
15 protected System.Collections.Specialized.ListDictionary catalog;
16 protected void Page_Load(object sender, EventArgs e)
17 {
18 String cbReference =
19 Page.ClientScript.GetCallbackEventReference(this,
20 "arg", "ReceiveServerData", "context");
21 String callbackScript;
22 callbackScript = "function CallServer(arg, context)"
23 "{ " cbReference "} ;";
24 Page.ClientScript.RegisterClientScriptBlock(this.GetType(),
25 "CallServer", callbackScript, true);
26
27 catalog = new System.Collections.Specialized.ListDictionary();
28 catalog.Add("monitor", 12);
29 catalog.Add("laptop", 10);
30 catalog.Add("keyboard", 23);
31 catalog.Add("mouse", 17);
32
33 ListBox1.DataSource = catalog;
34 ListBox1.DataTextField = "key";
35 ListBox1.DataBind();
36 }
37
38 public String RaiseCallbackEvent(String eventArgument)
39 {
40 String returnValue;
41 if (catalog[eventArgument] == null)
42 {
43 returnValue = "-1";
44 }
45 else
46 {
47 returnValue = catalog[eventArgument].ToString();
48 }
49 return returnValue;
50 }
51 }