This increases the burden on the server. Behind himself he thought it over. Want to use Ajax to achieve such an effect. The code is as follows:
Foreground code:
Copy Code code as follows:
<%@ Page language= "C #" autoeventwireup= "true" codefile= "ServerTextBoxdata.aspx.cs" inherits= "DEFAULT3"%>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<title> automatically populate user information with user name </title>
<script language= "javascript" type= "Text/javascript" src= "Ajax/jquery.js" ></script>
<script language= "javascript" type= "Text/javascript" >
Get the value of the User Name text box
function Writedatatext ()
{
var username=$ ("#Txtusename"). Val ();
if (username.length==0)
{
Alert ("The user name entered cannot be blank");
return;
}
Executing information about finding users by user name
$.ajax ({
Type: ' POST ',
URL: ' servertextboxdata.aspx ',
Data:{action: ' Action ', Username:username},
Success:writedatatextcallback
})
}
callback function to find information about a user by user name
function Writedatatextcallback (R)
{
if (r== "no")
{
Alert ("The user name entered does not exist.) Please re-enter ");
}
Else
{
var data=r;
var array=new array ();
Array=data.split (",");
Assign a value to a text box
$ ("#fullname"). Val (Array[0]);
$ ("#Email"). Val (array[1]);
$ ("#mobilphone"). Val (array[2]);
$ ("#qq"). Val (Array[3]);
}
}
</script>
<body>
<form id= "Form1" runat= "Server" >
<div align= "center" >
<table style= "text-align:center;width:800px" >
<tr style= "Background-color:yellow; width:800px ">
<TD colspan= ' 2 ' style= "Text-align:center" > <font size= "5" color= "Red" > User Details </font></td>
</tr>
<TR><TD colspan= ' 2 ' style= "Text-align:left" > User name: <asp:textbox id= "Txtusename" runat= "Server" > </asp:TextBox></td></tr>
<TR><TD style= "text-align:left;width:400px" > User full Name: <asp:textbox id= "FullName" runat= "Server" ReadOnly = "true" ></asp:textbox></td><td style= "text-align:left; width:400px > User email: <asp:textbox id= "Email" readonly= "true" runat= "Server" ></asp:TextBox></td> </tr>
<TR><TD style= "text-align:left;width:400px" > Mobile number: <asp:textbox runat= "Server" id= "Mobilphone" Readonly= "true" ></asp:textbox></td><td style= "text-align:left; width:400px ">
User qq: <asp:textbox runat= "Server" id= "QQ" readonly= "true" ></asp:TextBox></td></tr>
</table>
</div>
</form>
</body>
Background code:
Copy Code code as follows:
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;
Using System.Data.SqlClient;
public partial class Default3:System.Web.UI.Page
{
String straction = "";
protected void Page_Load (object sender, EventArgs e)
{
Straction = request["Action"];
To add an event that loses focus to a server control the key to not refreshing the server control
TXTUSENAME.ATTRIBUTES.ADD ("onblur", "Writedatatext ()");
Txtusename.focus ();
if (straction = = "Action")
{
Get the name of the user input
String username = request["username"];
if (! Isusername (username))
{
Response.Clear ();
Response.ContentType = "Application/text";
Response.Write ("no");
Response.End ();
}
Else
{
InitData (username);
}
}
}
<summary>
Create Person: Zhou Xin
Date Created: 2009-06-11
Method Name: InitData
Role: Find out more about the user
</summary>
<param name= "username" ></param>
public void InitData (string username)
{
SqlConnection mycon = new SqlConnection ();
Mycon. ConnectionString = configurationmanager.connectionstrings["Boboconn"]. ToString ();
String sql = "Select Fullname,email,mobilephone,qq from Loginuser where Username= '" +username+ "";
Mycon. Open ();
SqlCommand mycom = new SqlCommand (sql, mycon);
SqlDataReader Myda = mycom. ExecuteReader ();
while (Myda. Read ())
{
String fullname = myda["FullName"]. ToString ();
string email = myda["email"]. ToString ();
String mobilephone = myda["Mobilephone"]. ToString ();
String QQ = myda["QQ"]. ToString ();
String array = FullName + "," + Email + "," + mobilephone+ "," +QQ;
Response.Clear ();
Response.ContentType = "Application/text";
Response.Write (array);
Response.End ();
}
}
<summary>
Create Person: Zhou Xin
Date Created: 2009-06-11
Method Name: Isusername
Function: Returns a bool value to determine whether a user exists
</summary>
<param name= "username" ></param>
<returns></returns>
public bool Isusername (string username)
{
SqlConnection mycon = new SqlConnection ();
Mycon. ConnectionString = configurationmanager.connectionstrings["Boboconn"]. ToString ();
String sql = "SELECT COUNT (*) from Loginuser where username= '" + username + "'";
Mycon. Open ();
SqlCommand mycom = new SqlCommand (sql, mycon);
int n = (int) mycom. ExecuteScalar ();
Mycon. Close ();
if (n > 0)
{
return true;
}
Else
{
return false;
}
}
}
Effect: Only the User name text box is available before running
After the user enters the user name: After the mouse leaves the text box, the effect is as follows:
