in some content type form I added a checkbox. When this checkbox is checked I want to remove some of the submitted data.
To do so I created a custom module (my_module.module):
function my_module_form_alter(&$form, &$form_state) {
// ...
$form['#submit'][] = 'my_module_form_alter_submit';
}
function my_module_form_alter_submit($form_id, $form_values) {
drupal_set_message(t('Submit Function Executed!'));
}
How can I tell this module to refer only to the form of a certain containt type? And how can I remove data when it is submitted?