如何在无刷新页面的情况下实现客户端回调实例

joe · 发表于 2007-2-10 19:55

经常在网上找各种各样的资料看，来解决某一具有针对性的问题，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

istBox ID=\"ListBox1\" Runat=\"server\"></asp

istBox>
   <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 }

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