How to add extra arguments/parameters to ajax callback function?

Question

I am using drupal 7. I need to add extra arguments to my ajax callback function. I have five fieldsets in my form, and in all of them same there are same elements, just their IDs are different. For example; group-1, group-2... I need to include that 1,2,3.. part in the callback function as arguments. Otherwise, it will be too complicated to build a logic to predict which fieldset element need to change.

For example, is such a an implementation possible?

function mymodule_form($form, $form_state) {
    $group = 1;

    // Some form elements...

    $form['button'] = array(
        '#type' => 'button',
        '#ajax' => array(
            'callback' => 'my_callback_function',
            'wrapper' => 'my_target_area',
            'arguments' => array($group1, ...) // Is such a thing possible or another way? 
        ),
    );
}

function my_callback_function($args, $form, $form_state) {
    $arguments = $args;
    return $form['my_target_area'];
}

This question as already been asked here. But I those answers don't fit my needs mentioned above. Thank you.

Answer 1

Drupal doesn't have a mechanism to do that, no. As mentioned in the post you linked to, there's no need to pass that data to Javascript and then back to PHP though - just keep it in the form:

function mymodule_form($form, $form_state) {
  $form['button'] = array(
    '#type' => 'button',
    '#ajax' => array(
      'callback' => 'my_callback_function',
      'wrapper' => 'my_target_area',
    ),
  );

  $form['#foo'] = array($group1, ...);

}

function my_callback_function($form, $form_state) {
  $arguments = $form['#foo'];
  return $form['my_target_area'];
}

Answer 2

For pass data to ajaxCallback, this is how i do :

$form['repas'][$i]['detail']['midi']['mois_midi_'.$i] = [
              '#type' => 'select',
              '#title' => $this->t('Mois'),
              '#data'=>$i,
              '#options'=>array(
                  ''=>'Tous',
                  '01'=>'Janvier',
                  '02'=>'Février',
                  '03'=>'Mars',
                  '04'=>'Avril',
                  '05'=>'Mai',
                  '06'=>'Juin',
                  '07'=>'Juillet',
                  '08'=>'Aout',
                  '09'=>'Septembre',
                  '10'=>'Octobre',
                  '11'=>'Novembre',
                  '12'=>'Décembre',

              ),
              '#ajax'   => [
                  'event' => 'change',
                  'effet'=>'fade',
                  'wrapper'=>'legumes'.$i,
                  'method'=>'replace',
                  'callback' => array($this,'changeLegumeCallback'),
              ],
              '#default_value'=>$mois,
          ];

i add a custom attributes to my array : #data

Then in the callback :

public function changeLegumeCallback(array &$form, FormStateInterface $form_state){
    echo $form_state->getTriggeringElement()['#data'];
    exit();

}

You ll get your dynamic value from the trigger Element.

Answer 3

$form["action"] = [
  "#type" => "button",
  "#value" => "Retirer",
  "#arg" => $id,
  "#attributes" => ["class" => ["button button--small"]],
  "#ajax" => [
    "callback" => [$this,"remove_chiffre_item"],
    "event" => "click",   
    "progress" => [],
  ],
];

public function remove_chiffre_item(array &$form, FormStateInterface $form_state) {

  $element= $form_state->getTriggeringElement()["#arg"]; // $form["action"]["#arg"]
  drupal_set_message($element);
  return $form;
}

Answer 4

an other solution (I had to loop on inputs) :

$form['propositions_fieldset'][$i]['add_date_de_pose'] = array(
'#type' => 'submit',
'#value' => t('Ajouter une date de pose'),
'#submit' => array('ajax_date_de_pose_add_more_add_one'),
'#name'=>$i,
  '#ajax' => array(
      'callback' => 'ajax_date_de_pose_add_more_callback',
      'wrapper' => 'date-de-pose-fieldset-wrapper-'.$i,
     ),
);

You just have to add your argument with #name => $i

And get it back into the callback function with :

$i = $form_state['clicked_button']['#name'];


function ajax_date_de_pose_add_more_callback($form, $form_state) {
    $i = $form_state['clicked_button']['#name'];
    return $form['propositions_fieldset'][$i]['dates_de_pose_fieldset'];
}

I hope it helps