.aspx:
%@ 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>無標題頁/title>
script type="text/javascript">
//向服務器傳遞參數(shù)
function DoSearch(){
var firstName=document.getElementById("TextBox1").value;
CallServer(firstName,"");
}
//得到服務器的數(shù)據(jù)
function ReceiveServerData(txtUserInfo){
Results.innerHTML=txtUserInfo;
}
//設置每1秒執(zhí)行一次
setInterval("DoSearch()",1000);
/script>
/head>
body>
form id="form1" runat="server">
div>
姓名:asp:TextBox ID="TextBox1" runat="server">/asp:TextBox>
br />
span id="Results" style=" width:500px;">/span>
/div>
/form>
/body>
/html>
[/code]
.aspx.cs
[code]
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
{
protected string txtUserInfo;
protected void Page_Load(object sender, EventArgs e)
{
//獲取一個對客戶端函數(shù)的引用
string cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "ReceiveServerData", "context");
//動態(tài)注冊回調(diào)函數(shù)
string callbackScript = "function CallServer(arg,context)" + "{" + cbReference + "};";
//引發(fā)callbackScript
Page.ClientScript.RegisterStartupScript(this.GetType(), "CallServer", callbackScript, true);
}
//引發(fā)Callback事件處理
public void RaiseCallbackEvent(string txtFirstName)
{
if (txtFirstName != null)
{
String connString = System.Configuration.ConfigurationManager.ConnectionStrings["sqlserver2008"].ToString();
SqlConnection conn = new SqlConnection(connString);
conn.Open();
SqlCommand comm = new SqlCommand("select * from zzx where [name]=@name", conn);
comm.Parameters.Add("@name", SqlDbType.VarChar).Value = txtFirstName;
SqlDataReader reader = comm.ExecuteReader(CommandBehavior.CloseConnection);
if (reader.Read())
{
txtUserInfo = "員工編號:" + reader["id"].ToString() + "br>";
txtUserInfo += "員工姓名:" + reader["name"].ToString() + "br>";
txtUserInfo += "地址:" + reader["address"].ToString() + "br>";
txtUserInfo += "服務器查詢時間:" + DateTime.Now.ToString();
}
else
{
if (string.IsNullOrEmpty(txtFirstName))
{
txtUserInfo = "請輸入姓名";
}
else
{
txtUserInfo = "查無此人";
}
}
comm.Dispose();
reader.Dispose();
conn.Dispose();
}
}
//得到回調(diào)的結(jié)果,返回給客戶端
public string GetCallbackResult()
{
return txtUserInfo;
}
}
簡化版(偷懶一下):
%@ 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>無標題頁/title>
script type="text/javascript">
function OnCallBack(txtUserInfo,context){
Results.innerHTML=txtUserInfo;
}
/script>
/head>
body>
form id="form1" runat="server">
div>
姓名:asp:TextBox ID="TextBox1" runat="server">/asp:TextBox>
input id="Button2" type="button" value="button"
onclick="%=Page.ClientScript.GetCallbackEventReference(this, "document.getElementById('TextBox1').value", "OnCallBack",null)%>" />
br />
span id="Results" style="pink; width: 500;">/span>
/div>
/form>
/body>
/html>
.aspx.cs
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;
using System.Text;
public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
{
protected StringBuilder txtUserInfo;
protected void Page_Load(object sender, EventArgs e)
{
}
public string GetCallbackResult()
{
return txtUserInfo.ToString();
}
public void RaiseCallbackEvent(string txtFirstName)
{
txtUserInfo = new StringBuilder();
String connString = ConfigurationManager.ConnectionStrings["sqlserver2008"].ToString();
SqlConnection conn = new SqlConnection(connString);
conn.Open();
SqlCommand comm = new SqlCommand("select * from zzx where [name]=@name", conn);
comm.Parameters.Add("@name", SqlDbType.VarChar).Value = txtFirstName;
SqlDataReader reader = comm.ExecuteReader(CommandBehavior.CloseConnection);
if (reader.Read())
{
txtUserInfo.Append("員工編號:" + reader["id"].ToString() + "br>");
txtUserInfo.Append("員工姓名:" + reader["name"].ToString() + "br>");
txtUserInfo.Append("地址:" + reader["address"].ToString() + "br>");
txtUserInfo.Append("查詢時間:" + DateTime.Now.ToString());
}
else
{
if (txtFirstName == string.Empty)
{
txtUserInfo.Append("請輸入姓名");
}
else
{
txtUserInfo.Append("查無此人");
}
reader.Dispose();
comm.Dispose();
conn.Dispose();
}
}
}
示例3:
%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
!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>無標題頁/title>
script type="text/javascript">
//客戶端執(zhí)行的方法
//下面的方法是接收并處理服務器方法返回的結(jié)果
function Success(args,context){
message.innerHTML=args;
}
//下面的方式是當接收服務器方法處理的結(jié)果發(fā)生異常時調(diào)用的方法
function Error(){
message.innerHTML="發(fā)生了異常!";
}
/script>
/head>
body>
form id="form1" runat="server">
div>
用戶名:input type="text" id="txtUserName" onblur="CallServerMethod(txtUserName.value,null)" />
span id="message">/span>
br />
密碼:input type="password" size="10" maxlength="20" id="txtPwd" />
/div>
/form>
/body>
/html>
[code]
public partial class Default3 : System.Web.UI.Page,ICallbackEventHandler //實現(xiàn)ICallbackEventHandler接口
{
String result = String.Empty;
protected void Page_Load(object sender, EventArgs e)
{
//獲取當前頁的ClientScriptManager的引用
ClientScriptManager csm = Page.ClientScript;
/*獲取回調(diào)的引用.會在客戶端生成WebForm_DoCallback方法,
* 調(diào)用它來達到異步調(diào)用.這個方法是微軟寫的方法,會被發(fā)送
到客戶端*/
/*注意這里的"Success"和Error兩個字符串分別是客戶端代碼中
*定義的兩個javascript函數(shù)*/
//下面的方法最后一個參數(shù)的意義:true表示執(zhí)行異步回調(diào),false標志執(zhí)行同步回調(diào)
String reference = csm.GetCallbackEventReference(this, "args", "Success", "", "Error", true);
String callbackScript = "function CallServerMethod(args,context){\n"+
reference+";\n }";
//向當前頁面注冊javascript腳本代碼
csm.RegisterClientScriptBlock(this.GetType(), "CallServerMethod",callbackScript,true);
}
#region ICallbackEventHandler 成員
/// summary>
/// 返回回調(diào)方法執(zhí)行結(jié)果的方法
/// /summary>
public string GetCallbackResult()
{
return result;
}
/// summary>
/// 在服務器端運行回調(diào)方法
/// /summary>
public void RaiseCallbackEvent(string eventArgument)
{
if (eventArgument.ToLower().IndexOf("admin")!=-1)
{
result =eventArgument+ "不能作為用戶注冊.";
}
else
{
result = eventArgument + "可以注冊.";
}
}
#endregion
}
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