[xenos92]

Hello, 
I want to use a custom function to control an image field.
It works if I use it in the same controller with a callback ...

Exemple in my Administration Controller :

PHP Code:

if($config_rules['images'] == true){ $this->form_validation->set_rules('images','images','callback_require_upload');}

function require_upload(){ 

           $CI = $this->CI =& get_instance(); 
           //$CI->load->model('question_model');

           $CI->form_validation->set_message('require_upload', "Vous devez uploader une image");
        return false;

    } 


It works.
The problem is that I want to put my validation rule in a Form_validation libraries like this:

PHP Code:

class MY_Form_validation extends CI_Form_validation{ 

    protected $CI;   
     
    function __construct($config = array()){
          parent::__construct($config);
     }
        

    function require_upload(){ 
        
           $CI = $this->CI =& get_instance(); 

           $CI->form_validation->set_message('require_upload', "Vous devez uploader une image");
        return false;

        
    }
} 


 And I call now this rules like this : 

PHP Code:

if($config_rules['images'] == true){ $this->form_validation->set_rules('images','images','require_upload');} 


But I don't understand why it not works ?!

[jreklund]

I don't have the time to write and give you a complete answer. But what you are looking for are this:
https://www.codeigniter.com/userguide3/l...-as-a-rule

This example uses users_model. So you will have to do similar.

[InsiteFX]

@jreklund, Is correct you can only have a callback in the controller or in the model like he stated.

I put my callbacks in the controller and then link them into my libraries.
controller/callback -> to/method in library

[dave friend]

You can extend CI_Form_validation and define new callbacks there.

Some notes about your implementation of MY_Form_validation.

You do not need to add the property $CI. The parent class CI_Form_validation already has that property and it is accessible in the extending class.
You don't need MY_Form_validation::__construct because it does not do anything besides call parent:: __construct. PHP will call the parent constructor without your help.
In the new callback you don't have to find the instance of form_validation because you're in the instance you're looking for.

All that said, your class should look like this.

PHP Code:

class MY_Form_validation extends CI_Form_validation
{
    function require_upload()
    {
        $this->set_message('require_upload', "Vous devez uploader une image");
        return false;
    }
} 


As you stated, it would be used like this

PHP Code:

if($config_rules['images'] == true){ $this->form_validation->set_rules('images','images','require_upload');} 


Not sure why you have the callback always returning false. Maybe you're not done writing it yet?

[dave friend]

Exemple in my Administration Controller :

PHP Code:

function require_upload(){ 

   $CI = $this->CI =& get_instance(); 
   //$CI->load->model('question_model');

   $CI->form_validation->set_message('require_upload', "Vous devez uploader une image");
    return false;

 } 


If that code above is a controller you don't need $CI. Use $this instead. The function get_instance() returns a reference to the controller that is running and that's where you already are. Not that it matters if you extend CI_Form_validation as I suggested. But keep it in mind for future use.