Codeigniter : Validating two fields

Question

I have two numeric fields to collect data from users. Need to validate it using codeigniter form validation class.

Conditions:

First field can be zero
Second field cannot be zero
First field should not be equal to second field
Second field should be greater than first field

Currently I use

$this->form_validation->set_rules('first_field', 'First Field', 'trim|required|is_natural');

$this->form_validation->set_rules('second_field', 'Second Field', 'trim|required|is_natural_no_zero');

But, how to validate for 3rd and 4th condition mentioned above?

Thanks in advance.

Community · Accepted Answer · 2018-06-20 09:37:12Z

18

Thanks dm03514. I got it working by the below callback function.

$this->form_validation->set_rules('first_field', 'First Field', 'trim|required|is_natural');
$this->form_validation->set_rules('second_field', 'Second Field', 'trim|required|is_natural_no_zero|callback_check_equal_less['.$this->input->post('first_field').']');

and the callback function is:

function check_equal_less($second_field,$first_field)
  {
    if ($second_field <= $first_field)
      {
        $this->form_validation->set_message('check_equal_less', 'The First &amp;/or Second fields have errors.');
        return false;       
      }
      return true;
  }

Everything seems to be working fine now :)

edited Jun 20, 2018 at 9:37

CommunityBot

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answered Mar 14, 2013 at 14:51

Prashanth JC

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dm03514 · Accepted Answer · 2013-03-12 16:53:21Z

4

You can write your own validation function for 3, and 4 using callbacks

http://ellislab.com/codeigniter/user-guide/libraries/form_validation.html#callbacks

Example from doc

<?php

class Form extends CI_Controller {

    public function index()
    {
        $this->load->helper(array('form', 'url'));

        $this->load->library('form_validation');

        $this->form_validation->set_rules('username', 'Username', 'callback_username_check');
        $this->form_validation->set_rules('password', 'Password', 'required');
        $this->form_validation->set_rules('passconf', 'Password Confirmation', 'required');
        $this->form_validation->set_rules('email', 'Email', 'required|is_unique[users.email]');

        if ($this->form_validation->run() == FALSE)
        {
            $this->load->view('myform');
        }
        else
        {
            $this->load->view('formsuccess');
        }
    }

    public function username_check($str)
    {
        if ($str == 'test')
        {
            $this->form_validation->set_message('username_check', 'The %s field can not be the word "test"');
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }

}
?>

answered Mar 12, 2013 at 16:53

dm03514

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1 Comment

Prashanth JC Over a year ago

But, how to pass the other field values in the callback function?? In the CI Documentation, $str is set to 'test' in the callback function; but I need to pass the first field value to the call back function of second field.

rumman0786 · Accepted Answer · 2015-02-05 11:03:27Z

0

If you are using HMVC and the accepted solution doesn't work then add the following line after initialization in your controller

$this->form_validation->CI =& $this;

So it will be

$this->load->library('form_validation');
$this->form_validation->CI =& $this;

in your controller.

answered Feb 5, 2015 at 11:03

rumman0786

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