Jun 2 2011

CodeIgniter Extending Form_Validation

By Colin • CodeIgniter • 0

You can add generic validation functions to codeigniter by extending the Form_Validation. You do this by creating a file called /application/library/MY_Form_Validation.php.

If you load the Form_Validation library it will pick-up this class and use it instead. Because it extends the original class CI_Form_validation you still have access to all the normal functions.

Here is an example that adds 2 validation functions:

= $min);

		if ($out == false) {
			$this->set_message('greater_or_equal', 'The %s field must be greater or equal to the %s');
		}

		return $out;
	}

	public function less_or_equal($str, $max)
	{
		if ( ! is_numeric($str))
		{
			return FALSE;
		}

		if ( ! isset($_POST[$max]))
		{
			return FALSE;
		}

		if(! is_numeric($max)) {
			if (! is_numeric($_POST[$max])) {
				return FALSE;
			}
			else {
				$max = $_POST[$max];
			}
		}

		$out = ($str <= $min);

		if ($out == false) {
			$this->set_message('greater_or_equal', 'The %s field must be greater or equal to the %s');
		}

		return $out;
	}
}

You can use it like this:

$this->form_validation->set_rules('max', 'maximum', 'numeric|greater_or_equal[min]');