CodeIgniter Registration Form Part 5

Part 5 of a series of tutorials on how to create a user registration form in CodeIgniter. This particular video covers form validation callback functions, where, in this case, we are checking to make sure that the username the user has chosen doesn't already exist in the database.

More CodeIgniter tutorials, all in one place, at http://www.simplycodeigniter.com.

Category:

Education

Tags:

• codeigniter
• registration form
• form validation
• callback functions

[ldexterldesign]

'username_not_exists' - pahaha.

Alasdair I think I love you.

[Verbloten]

@ldexterldesign ok? I love you too?

[mystiknrg]

is there a rule to achieve the behaviour opposite to "match"...for example suppose you dont want a username to be the same as your password (for security reasons), hence you would need an validation error to be thrown if both values equal.

Is there a built in rule for that or would I have to write my own callback?

THanks.

[Verbloten]

@mystiknrg You could create a custom rule or just do the following: In system/language/english (or as appropriate) /form_validation_lang.php add: $lang['not_matches']= "The %s field can not match the %s field."; In system/libraries/form_validati­on.php add: function not_matches($str, $field) { if ( ! isset($_POST[$field])) { return TRUE; } $field = $_POST[$field]; return ($str == $field) ? FALSE : TRUE; }

[Verbloten]

@Verbloten

somewhere near function matches.

Then in your form rules simply say not_matches[username] for the password field

[drago8701]

@nalixl

$result = $this->db->query($query, $username);

return ($result->num_rows() > 0) ? true : false;

[nalixl]

Why work with if .. else .. statements in check_exists_username? Something like this seems more logical to me:

[code]

function check_exists_username($usernam­e){ $query_str = "blah"; $result = blah; if ($result->num_rows() == 0) return true; return false;

}

[/code]

[OldviSinger]

Nicely done!

[mystiknrg]

@Verbloten Oh wow..i didnt know it was that easy to extend the functionality of CI

Thanks alot for your quick response!

[Mike01010011]

Another excellent video. I learned a hell of a lot. Thanks very much!