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Automatically fill in the Ajax server text box

Source: Internet
Author: User
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This increases the burden on the server. He thought about it later. I want to use ajax to achieve this effect. Code As follows:
Front-end code: Copy code The Code is 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">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> other user information is automatically filled with the user name </title>
<Script language = "JavaScript" type = "text/JavaScript" src = "ajax/jquery. js"> </SCRIPT>
<Script language = "JavaScript" type = "text/JavaScript">
// Obtain the User Name text box Value
Function writedatatext ()
{
VaR username = $ ("# txtusename"). Val ();
If (username. Length = 0)
{
Alert ("the user name entered cannot be blank ");
Return;
}
// Execute the following command to find the user information:
$. Ajax ({
Type: 'post ',
URL: 'servertextboxdata. aspx ',
Data: {Action: 'action', Username: username },
Success: writedatatextcallback
})
}
// Callback function for searching user-related information by user name
Function writedatatextcallback (r)
{
If (r = "no ")
{
Alert ("the user name entered does not exist. Enter ") again ");
}
Else
{
VaR DATA = R;
VaR array = new array ();
Array = data. Split (",");
// Assign a value to the text box
$ ("# Fullname"). Val (array [0]);
$ ("# Email"). Val (array [1]);
$ ("# Your Phone"). Val (array [2]);
$ ("# QQ"). Val (array [3]);
}
}
</SCRIPT>
</Head>
<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 phone number: <asp: textbox runat = "server" id = "your phone" 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>
</Html>

Background code: Copy code The Code is 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"];
// The Key to adding events with no focus for the server control so that the server control is not refreshed
Txtusename. Attributes. Add ("onblur", "writedatatext ()");
Txtusename. Focus ();
If (straction = "action ")
{
// Obtain the name entered by the user
String username = request ["username"];
If (! Isusername (username ))
{
Response. Clear ();
Response. contenttype = "application/text ";
Response. Write ("no ");
Response. End ();
}
Else
{
Initdata (username );
}
}
}
/// <Summary>
/// Created by Zhou Xin
/// Creation Time:
/// Method Name: initdata
/// Function: Search for user details
/// </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>
/// Created by Zhou Xin
/// Creation Time:
/// Method Name: isusername
/// Function: return the bool value to determine whether the 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:

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