triming on data submitting

You are always going to have to trim data to remove whitespace in text fields (if whitespace is a problem). Even if you do it with JS browser side, you will still have to check and remove it server side too. So you are always going to need a trim function of some sort.

PHP's trim function,

Code:

trim($string);

http://php.net/manual/en/function.trim.php

Jquery's trim function

Code:

$.trim(string);

https://api.jquery.com/jQuery.trim/

Javascript trim function

Code:

string.trim()

http://www.w3schools.com/jsref/jsref_trim_string.asp

The 'trim' in the form validation is just applying the native php's trim function. You can set any php function with just one argument to a validation check in CI. https://www.codeigniter.com/user_guide/l...pping-data