AJAX user registration demo

Source: Internet
Author: User
Tags mysql tutorial php tutorial strlen
The code is as follows: Copy code
<! Doctype html public "-// w3c // dtd html 4.0 // en"
Http://www.w3.org/tr/rec-html140/strict.dtd>
<Html>
<Head>
<Meta http-equiv = "content-type" content = "text/html; charset = gb2312">
<Title> ajax user registration demo </title>
<Script language = "webpage effect" type = "text/webpage effect">
<! --
// Create a function
Function createxmlhttp ()
{
Var request;
Var browser = navigator. appname;
// If ie is used, the xmlhttp object is used.
If (browser = "microsoft internet explorer ")
  {
Var arrversions = ["microsoft. xmlhttp", "msxml2.xmlhttp. 4.0 ",
"Msxml2.xmlhttp. 3.0", "msxml2.xmlhttp", "msxml2.xmlhttp. 5.0"];
For (var I = 0; I <arrversions. length; I ++)
    {
Try
      {
// Locate a supported version and create an xmlhttp object
Request = new activexobject (arrversions [I]);
Return request;
      }
Catch (exception)
      {
// Ignore and continue
      }
    }
  }
Else
  {
// Otherwise, an xmlhttprequest object is returned.
Request = new xmlhttprequest ();
If (request. overridemimetype)
    {
Request. overridemimetype ('text/XML ');
}
Return request;
  }  
}
// Global xmlhttp object instance variable
Var http = createxmlhttp ();
// Send the request
Function chkuser ()
{
Var url = "check. php Tutorial"; // request "checkusername" servlet
Var name = document. getelementbyid ("username"). value;
Url + = ("? Username = "+ escape (name) +" & oprate = chkuser ");
Http. open ("get", url, true );
Http. onreadystatechange = processhttpresponse;
Http. send (null );
Return;
}
// Process the response
Function processhttpresponse ()
{
If (http. readystate = 4)
  {
If (http. status = 200)
    {
Var xmldocument = http. responsexml;
If (http. responsetext! = "This user name is valid and can be used! ")
      {
// Dynamic display of returned information
Document. getelementbyid ("showstr"). style. display = "";
Document. getelementbyid ("username"). style. background = "# ff0000 ";
Document. getelementbyid ("showstr"). innertext = http. responsetext;
}
Else
      {
Document. getelementbyid ("username"). style. background = "# ffffff ";
Document. getelementbyid ("showstr"). style. display = "";
Document. getelementbyid ("showstr"). innertext = http. responsetext;
}
    }
Else
    {
Alert ("the page you requested has an exception, which may affect your browsing of this page! ");
Alert (http. status );
    }
  }
}
// Check the input password
Function chkpassword ()
{
Var m = document. form1;
If (m. password. value. length> 20 | m. password. value. length <6)
  {
Document. getelementbyid ("passwordstr"). style. display = "";
Document. getelementbyid ("password"). style. background = "# ff0000 ";
Document. getelementbyid ("passwordstr"). innertext = "Sorry, the password must be a letter, number, or underline. The length is 6 ~ 20! ";
   }
Else
   {
Document. getelementbyid ("password"). style. background = "# ffffff ";
Document. getelementbyid ("passwordstr"). style. display = "none ";
   }
}
// Verify that the two passwords are consistent
Function chkconfirmpassword ()
{
Var m = document. form1;
If (m. password. value! = M. confirmpassword. value)
{
Document. getelementbyid ("confirmpasswordstr"). style. display = "";
Document. getelementbyid ("confirmpassword"). style. background = "# ff0000 ";
Document. getelementbyid ("confirmpasswordstr"). innertext = "Sorry, the password is inconsistent with the repeated password! ";
}
Else
{
Document. getelementbyid ("confirmpassword"). style. background = "# ffffff ";
Document. getelementbyid ("confirmpasswordstr"). style. display = "none ";
}
}
// Verify whether the email is valid
Function chkemail ()
{
Var m = document. form1;
Var email = m. email. value;
// Regular expression
Var regex =/^ ([A-Za-z0-9 _-]) + @ ([A-Za-z0-9 _-]) + (. [A-Za-z0-9 _-]) + /;
Var flag = regex. test (email );
If (! Flag)
{
Document. getelementbyid ("emailstr"). style. display = "";
Document. getelementbyid ("email"). style. background = "# ff0000 ";
Document. getelementbyid ("emailstr"). innertext = "Sorry, invalid email address! ";
}
Else
{
Document. getelementbyid ("email"). style. background = "# ffffff ";
Document. getelementbyid ("emailstr"). style. display = "none ";
}
  
}
// Submit the check function
Function submitcheck ()
{
Var m = document. form1;
If (m. username. value. length = 0)
  {
Alert ("Sorry, the username must be an English letter, number, or underline. The username length is 5 ~ 20. ");
M. username. focus ();
Return false;
  }
If (m. password. value. length = 0)
  {
Alert ("Sorry, the password must be a letter, number, or underline. The password length is 5 ~ 20. ");
M. password. focus ();
Return false;
  }
If (m. password. value! = M. confirmpassword. value)
  {
Alert ("Sorry, the password is inconsistent with the repeated password! ");
M. confirmpassword. focus ();
Return false;
  }
If (m. email. value. length = 0)
  {
Alert ("Sorry, the email address cannot be blank !! ");
M. email. focus ();
Return false;
  }
M. submit ();
}
// -->
</Script>
<Body>
<Form name = "form1" method = "post" action = "register. php">
<H3 align = "center"> ajax user registration program <Table align = "center" width = "500" border = "1">
<Tr>
<Td> <font color = "red"> * </font> </td>
<Td width = "100"> user account: </td>
<Td> <input type = "text" name = "username" maxlength = "20" style = "background = # ffffff" onblur = "chkuser ()"> </td>
<Td> <div id = "showstr" style = "background-color: # ff9900; display: none"> </div> </td>
</Tr>
<Tr>
<Td> <font color = "red"> * </font> </td>
<Td> user password: </td>
<Td align = "left"> <input type = "password" name = "password" maxlength = "22" style = "background = # ffffff" onblur = "chkpassword () "/> </td>
<Td> <div id = "passwordstr" style = "background-color: # ff9900; display: none"> </div> </td>
</Tr>
<Tr>
<Td> <font color = "red"> * </font> </td>
<Td> Confirm password: </td>
<Td> <input type = "password" name = "confirmpassword" maxlength = "20" style = "background = # ffffff" onblur = "chkconfirmpassword () "/> </td>
<Td> <div id = "confirmpasswordstr" style = "background-color: # ff9900; display: none"> </div> </td>
</Tr>
<Tr>
<Td> <font color = "red"> * </font> </td>
<Td> email: </td>
<Td> <input type = "text" name = "email" maxlength = "100" style = "background = # ffffff" onblur = "chkemail ()"> </td>
<Td> <div id = "emailstr" style = "background-color: # ff9900; display: none"> </div> </td>
</Tr>
</Table>
<Div align = "center">
 
<Input type = "button" name = "OK" value = "OK" onclick = "submitcheck ()">
<Input type = "reset" name = "reset" value = "cancel">
</Form>
</Div>
</Body>
</Html>

Reg. php detection program

The code is as follows: Copy code

<? Php
Header ("content-type: text/html; charset = gb2312 ");
@ Mysql tutorial _ connect ('localhost', 'root', 'ebaeba ') or die ("database tutorial server connection failed ");
@ Mysql_select_db ("test") or die ("The database does not exist or is unavailable ");

 

$ Uname = $ _ get ['username'];
// Perform the following database query to check whether this user exists.
// If this user name is not found

 

$ SQL = "select * from t1 where name = '". $ uname ."'";
$ Query = mysql_query ($ SQL );
$ Row = mysql_fetch_object ($ query );

If (strlen ($ uname) <6 | strlen ($ uname)> 20)
{
$ Msg = "the user name must be 6 to 20 characters .";
}
Else
{
 
If ($ row = false)
   {
$ Msg = "this user name is valid and can be used! ";
   }
Else
   {
$ Msg = "Sorry, this user name already exists. Please register with another user name! ";
   }
}
Echo $ msg;
?>

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