Passing multiple callback in Code Igniter form validation rules

Question

I want to pass multiple callbacks in codeigniter form validation rules.... but only one of the callbacks work

I am using this syntax in my contoller

$this->form_validation->set_rules(           
                array(
                    'field' => 'field_name',
                    'label' => 'Field Name',
                    'rules' => 'callback_fieldcallback_1|callback_fieldcallback_2[param]',
                    'errors' => array(
                        'fieldcallback_1' => 'Error message for rule 1.',
                        'fieldcallback_2' => 'Error message for rule 2.',
                        )
                    ),
                );

and the callback functions are....

function fieldcallback_1 (){
      if(condition == TRUE){
              return TRUE;
      } else {
              return FALSE;
      }

}

function fieldcallback_2 ($param){
      if(condition == TRUE){
              return TRUE;
      } else {
              return FALSE;
      }

}

Someone please help me out with this problem.... any other solutions regarding passing multiple callbacks in form validation rules are also appreciated...

Why not call validation functions inside of another callback function? — Medet Ahmetson Atabayev
– Medet Ahmetson Atabayev, Commented Apr 29, 2016 at 13:17

DFriend · Accepted Answer · 2016-04-29 14:35:04Z

2

All validation routines must have at least one argument which is the value of the field to be validated. So, a callback that has no extra arguments should be defined like this.

function fieldcallback_1($str){
      return ($str === "someValue");
}

A callback that requires two arguments is defined like this

function fieldcallback_2 ($str, $param){
    //are they the same value?
    if($str === $param){
        return TRUE;
     } else {
         $this->form_validation->set_message('fieldcallback_2', 'Error message for rule 2.');
         //Note: `set_message()` rule name (first argument) should not include the prefix "callback_"
         return FALSE;
}

answered Apr 29, 2016 at 14:35

DFriend

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2 Comments

besrabasant Over a year ago

No, $str and $param are not the same value. I am comparing whether $str > $param.

DFriend Over a year ago

I use equality only as an example. Substitute the condition of your choice.

Medet Ahmetson Atabayev · Accepted Answer · 2016-04-29 13:24:04Z

Maybe like this?

     $this->form_validation->set_rules(           
            array(
                'field' => 'field_name',
                'label' => 'Field Name',
                'rules' => 'callback_fieldcallback_1[param]'),
     );

   // Functions for rules
   function fieldcallback_1 ($param){
       if(condition == TRUE){
               return fieldcallback_2($param);
       } else {
                $this->form_validation->set_message('callback_fieldcallback_1', 'Error message for rule 1.');

               return FALSE;
       }

 }

 function fieldcallback_2 ($param){
       if(condition == TRUE){
               return TRUE;
       } else {
                $this->form_validation->set_message('callback_fieldcallback_1', 'Error message for rule 2.');
               return FALSE;
       }

 }

Genki · Accepted Answer · 2024-11-03 07:58:30Z

Use serialize() to pass multiple parameters to the form validation callback:

public function get_form_input() {
    // assemble the parameters into an array, as many as you like
    $aryParams = ['item_1' => $value1, 'item_2' => $item2, 'item_3' => $value3];

    // serialize the array (creates a string)
    $strSerializedArray = serialize($aryParams);

    // pass the string to the callback
    $this->form_validation->set_rules('form_field_name', 'Your Message', 'callback_validate_form_data['.$strSerializedArray.']');
}

// and, the callback function:

public function _validate_form_data($form_field, $strSerializedArray) {

   // convert the string back to an array
    $aryParams = unserialize($strSerializedArray);

    // use the array elements, as needed
    $item_1 = $aryParams['item_1'];
    $item_2 = $aryParams['item_2'];
    $item_3 = $aryParams['item_3'];
}

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