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Thank you for this fantastic tutorial, Nicolas Bouteille! I want a very similar functionality on a website I am working on, but I am stuck! Can you help me?

What I'm trying to achieve, is that when a visitor makes a change in one of the exposed filters the submit button's label will change to something like this: "Submit (8 results)". So what I need to get, is the number of results of the view. That's where I am now... I can't seem to execute the view in the module_form_alter function (the whole page goes blank). If I'm right the view is in the form_alter isn't executed yet, so the count of the results doesn't exist yet.

Here is my code:

function magyarkerteszek_form_alter(&$form, &$form_state, $form_id) {
    $view_name = 'termelok';
if ($form_id == 'views_exposed_form') {
        $view = $form_state['view'];
        if ($view->name == $view_name) {
            /*
             * Modifying View results
             */
            $fields = array(
                'field_ter_let_value',
                'field_id_szak_tid',
                'field_termeszt_hely_tid',
                'field_technol_gia_tid',
            );

      
            foreach ($fields as $field) {
                if (isset($form[$field])) :
                    /*
                     * Create AJAX event
                     */    
                    $form[$field]['#ajax'] = array(
                      'callback' => '_update_submit_callback',
                      'wrapper' => 'submit_wrapper',
                    );   
                endif;
            }

            $count = count($view->result);
            $form['submit']['#value'] = 'Submit (' . $count . ' results)';          
           
            $form['submit']['#prefix'] = '<div id="submit_wrapper">';
            $form['submit']['#suffix'] = '</div>';

            if(!empty($form_state['values'])) {
                $form_state['input'] = array_merge($form_state['input'], $form_state['values']);
            }
        }
    }
}

function _update_submit_callback($form, $form_state) {
    return $form['submit'];
}