Create custom validation callback in form_validation.php using codeingiter

Question

Hello i am trying to create a validation callback for my form to validate a field only if it is not empty. I created my validation rules into a config file named form_validation.php. Here is a part of its content :

$config=array(
  'Users_Controller/add'=>array(
        array(
            'field'=>'email',
            'label'=>'email',
            'rules'=>'callback_email'
        ),
   )
);

public function email($value){
   if( trim( strlen($value) )!==0 ){
      $this->form_validation->set_rules(
         'email',
         'email',
         'valid_email|is_unique[users.email]',
          array(
             'valid_email'=>'invalid email',
             'is_unique' => 'email already registered'
         )
      )
   }
}

In my controller,in users_Controller.php here is how i handle the form submission :

class Users_Controller  extends CI_Controller{
     public function add(){
         if($this->form_validation->run()){
              $this->User_model->save();
              $this-session->set_flashdata('success','okay');
              redirect('users/list');
         }
         else {
              $this->load->view('add')
         }
     }
}

Unfortunately, the validation does not take in account the callback validation method i added in the config file form_validation.php but if i put this callback in the controller, the validation process ignore all the others rules puted in form_validation.php

Any help ? Thanks in advance.

Please check this link :- stackoverflow.com/questions/19324420/callback-function-in- codeigniter-with-multiple-parameters-during-form-validation — Praveen Kumar
– Praveen Kumar, Commented Dec 28, 2017 at 9:12

Pradeep · Accepted Answer · 2017-12-28 09:10:00Z

1

Hope this helps you

form_validation.php

/*put callback rule in form_validation.php*/

$config=array(
   'Users_Controller/add'=>array(
    array(
        'field'=>'email',
        'label'=>'email',
        'rules'=>'callback_check_email'
    ),
  )
);

put callback method in Users_controller.php

In Users_controller.php

function check_email($value)
{
    /*check your email rule here as u want */
    /* this is just example*/ 

    $email= $this->YourModel->getemailofUser();
    if ($value == $email) {
        return TRUE;
    }
    else 
    {
        $this->form_validation->set_message('check_email', 'Your email is not a valid registered email!');
        return FALSE;
    }

}

For more : https://www.codeigniter.com/user_guide/libraries/form_validation.html#callbacks-your-own-validation-methods

answered Dec 28, 2017 at 9:10

Pradeep

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2 Comments

the smart life Over a year ago

thanks i works, but i wanted to keep the callback function in the config file. is there a way to dot that ?

Pradeep Over a year ago

i never implement that as no descriptions are given in documentation

Hasta Dhana · Accepted Answer · 2017-12-28 10:22:33Z

0

In order to call a specific validation rules group, such as Users_Controller/add, you need to pass group name to the run() method.
Users_controller.php

    ...
    public function add(){
        if($this->form_validation->run('Users_Controller/add')){
        ...
    }
    ...

And for a validation callback to work properly, you have to place the callback method within the same controller of the method that is calling the callback.

answered Dec 28, 2017 at 10:22

Hasta Dhana

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1 Comment

the smart life Over a year ago

Thanks. i finaly found the solution by adding moving my callback function to the controller.

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