I have an AJAX form with a callback that fires some JavaScript when the form is submitted.

I need to know what has been repainted. Can I get the class / ID of the parts of the form that have been changed by submitting the form?

AJAX callback:

function _my-module_form_process_callback_js($form, &$form_state) {
  $commands = array();

  $commands[] = array (
    'command' => 'customSomething',


  Drupal.ajax.prototype.commands.customSomething = function(ajax, response, status) {



By logging ajax I can see the form ID and class. However I don't belive that the entire form is being repainted. Most of the form is unchanged, its only one fieldset that changes.

1 Answer 1


I don't know if its the best solution but this works:

  Drupal.ajax.prototype.commands.customSomething = function(form) {

    var formId = '#' + form.form.context.id;


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