前台代码：
1
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
2
3<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4<html xmlns="http://www.w3.org/1999/xhtml">
5<head runat="server">
6 <title>ICallbackEventHandler的一个例子</title>
7</head>
8<body>
9 <form id="form1" runat="server">
10 <div>
11 <asp:DropDownList ID="ddlSelect" runat="server">
12 <asp:ListItem Text="1" Value="选择的是1">1</asp:ListItem>
13 <asp:ListItem Text="2" Value="选择的是2">2</asp:ListItem>
14 <asp:ListItem Text="3" Value="选择的是3">3</asp:ListItem>
15 <asp:ListItem Text="4" Value="选择的是4">4</asp:ListItem>
16 <asp:ListItem Text="5" Value="选择的是5">5</asp:ListItem>
17 </asp:DropDownList>
18 <br />
19 <asp:TextBox ID="txtword" runat="server"></asp:TextBox><br />
20 <asp:Label ID="lblword" runat="server" Text="Label"></asp:Label>
21 </div>
22
23 <script type="text/javascript">
24
25 function SetSuppInfo()
26
{
27 var SuppID = document.getElementById('<%=ddlSelect.ClientID %>').value;
28 CSGetSuppInfo(SuppID);
29
}
30
31 function CSGetSuppInfo(SuppID)
32 {
33 args = "GetFunction^" + SuppID;
34 <%= Page.ClientScript.GetCallbackEventReference(this,"args","GetSuppInfoReturn","") %>
35 }
36
37 function GetSuppInfoReturn(result)
38 {
39 if(result != "")
40 {
41 var EmpName = document.getElementById('<%=txtword.ClientID %>');
42 EmpName.value = result;
43 var EmpTel = document.getElementById('<%=lblword.ClientID %>');
44 EmpTel.innerText = result;
45 }
46 else
47 {
48 alert("没有返回值！");
49 }
50
51 }
52
</script>
53
54 </form>
55</body>
56</html>
后台代码：<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
2
3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">4
<html xmlns="http://www.w3.org/1999/xhtml">5
<head runat="server">6
<title>ICallbackEventHandler的一个例子</title>7
</head>8
<body>9
<form id="form1" runat="server">10
<div>11
<asp:DropDownList ID="ddlSelect" runat="server">12
<asp:ListItem Text="1" Value="选择的是1">1</asp:ListItem>13
<asp:ListItem Text="2" Value="选择的是2">2</asp:ListItem>14
<asp:ListItem Text="3" Value="选择的是3">3</asp:ListItem>15
<asp:ListItem Text="4" Value="选择的是4">4</asp:ListItem>16
<asp:ListItem Text="5" Value="选择的是5">5</asp:ListItem>17
</asp:DropDownList>18
<br />19
<asp:TextBox ID="txtword" runat="server"></asp:TextBox><br />20
<asp:Label ID="lblword" runat="server" Text="Label"></asp:Label>21
</div>22
23
<script type="text/javascript">24
25
function SetSuppInfo()26
{27
var SuppID = document.getElementById('<%=ddlSelect.ClientID %>').value;28
CSGetSuppInfo(SuppID);29
}30
31
function CSGetSuppInfo(SuppID)32
{33
args = "GetFunction^" + SuppID;34
<%= Page.ClientScript.GetCallbackEventReference(this,"args","GetSuppInfoReturn","") %>35
}36
37
function GetSuppInfoReturn(result)38
{39
if(result != "")40
{41
var EmpName = document.getElementById('<%=txtword.ClientID %>');42
EmpName.value = result;43
var EmpTel = document.getElementById('<%=lblword.ClientID %>');44
EmpTel.innerText = result;45
}46
else47
{48
alert("没有返回值！");49
}50
51
}52
</script>53
54
</form>55
</body>56
</html> 1using System;
2using System.Data;
3using System.Configuration;
4using System.Web;
5using System.Web.Security;
6using System.Web.UI;
7using System.Web.UI.WebControls;
8using System.Web.UI.WebControls.WebParts;
9using System.Web.UI.HtmlControls;
10
11public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
12{
13 protected void Page_Load(object sender, EventArgs e)
14 {
15 ddlSelect.Attributes.Add("onchange", "SetSuppInfo();return false;");
16 }
17
18 public string GetFunction(string str)
19 {
20 if (str == "")
21 {
22 return "";
23 }
24 else
25 {
26 return str;
27 }
28 }
29
ICallbackEventHandler Members
53}
54
using System;2
using System.Data;3
using System.Configuration;4
using System.Web;5
using System.Web.Security;6
using System.Web.UI;7
using System.Web.UI.WebControls;8
using System.Web.UI.WebControls.WebParts;9
using System.Web.UI.HtmlControls;10
11
public partial class _Default : System.Web.UI.Page, ICallbackEventHandler12
{13
protected void Page_Load(object sender, EventArgs e)14
{15
ddlSelect.Attributes.Add("onchange", "SetSuppInfo();return false;");16
}17
18
public string GetFunction(string str)19
{20
if (str == "")21
{22
return "";23
}24
else25
{26
return str;27
}28
}29
ICallbackEventHandler Members53
}54
