validating username

[sudhakararaog]

my question is about validation using php. i am validating a username which a user would enter and clicks on a image to find

 

if that username is available. example if a user enters abc#123 php file is reading this value as abc ONLY which i do not

 

want instead the php file should read as abc#123. follow is the sequence of pages. please advice the solution.

 

first page = register.php here a user enters a username and clicks on an image to find out if the username is available or

 

not. using a javascript function of onclick i am reading the value entered in the form in javascript as

=============================================

var useri = document.registrationform.username

var valueofuseri = document.registrationform.username.value

 

var recui = /^\s{1,}$/g;

 

if ((useri.value==null) || (useri.value=="") || (useri.length=="") || (useri.value.search(recui))> -1)

{

alert("Please Enter a User Name")

return false

}

 

window.open("checkusernamei.php?theusernameis="+valueofuseri, "titleforavailabilityi", "width=680,  height=275, status=1,

 

scrollbars=1, resizeable=yes");

 

============================================

 

second page = checkusernamei.php = this file uses GET to read what was entered in the form.

============================================

$username = $_GET["theusernameis"];

 

if( $username == "" ||  !preg_match("/^[a-z0-9]+(?:_[a-z0-9]+)?$/i", $username) )

{

echo "username is blank or has special characters";

}

============================================

the # sign is being ignored only if the image is clicked in order to check the username, if the user enters abc#123 and

 

clicks the submit button without clicking on the checkuser image button then my php validation for username shows an error

 

message.

 

==============================================================

if( $username == "" ||  !preg_match("/^[a-z0-9]+(?:_[a-z0-9]+)?$/i", $username) )

{ echo "display error message for username"; }

==============================================================

now the problem is with clicking the image only and passing using GET method how can i fix this problem.

 

please advice.

 

thanks.

 

[BlueSkyIS]

you need to use Javascript to urlencode the username before window.open()

 

here is some info (view source to see code):

 

http://www.albionresearch.com/misc/urlencode.php