Displaying error messages below the field

Your if statement is wrong see the CodeIgniter Users Guide - Input Library

PHP Code:

$this->input->is_ajax_request(); 


Also if you read the CodeIgniter Users Guide on the Form_validation Library you can place the error code below any field or at the top.

Yes there is 

PHP Code:

echo form_error(''); 


function to do so but it work only we have normal POST type submit. please go through again my post you'll understand what exactly i want.