<input type="submit" class="form-submit" value="" name="op" id="edit-submit">

I want to alter the class from "form-submit" to "form-submitone".

How can do I do it? Where does the class "form-submit" come from?


If I were you, I would not change the class name but rather add your own class to the form element. You can do this by implementing hook_form_alter in a custom module or (in case of Drupal 7) in your theme. The code would look something like this:

function mymodule_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id = 'my_form') {
    $form['actions']['submit']['#attributes']['class'][] = 'form-submitone';

By the way, the submit button element is not necessarily $form['actions']['submit']. You will have to figure out which element is the submit button in your specific situation. You can do that by outputting the $form variable; I recommend installing the Devel module and adding dsm($form); to the function above.

  • how do you know this can give a class to the submit button.$form['actions']['submit']['#attributes']['class'][]
    – enjoylife
    May 23 '11 at 9:51
  • 2
    It's in the Forms API reference, api.drupal.org/api/drupal/…. May 23 '11 at 10:01
  • the api shows as this $form['#attributes'] = array('class' => array('search-form')); why you write as this .$form['actions']['submit']['#attributes']['class'][]. and have a []? thank you
    – enjoylife
    May 23 '11 at 10:04
  • 7
    If you would do $form['actions']['submit']['#attributes']['class'] = array('form-submitone');, you would be overriding all classes that are already set. If you would do $form['actions']['submit']['#attributes'] = array('class' => array('form-submitone'));, you would overwrite not only the existing classes, but all attributes. (PS See also my addition to the answer above.) May 23 '11 at 10:40
  • This works in Drupal 8 too. Mar 24 '20 at 10:02

this code basically user dor add your custom class on form submit button.

function subscriber_form(){
    $form['submit'] = array(
    '#type'  => 'submit',
    '#attributes'=>array('class'=> array('mybtn')),
    '#ajax' => array(
      'callback' => 'subscriber_ajax_callback',
    '#value' =>'Submit', // @FIXME doesn't render quotes properly

  • 2
    this is not correct, the "class" item in the #attributes array needs to be an array: 'class' => array("mybtn-class", "mybtn-class2")
    – DrCord
    Aug 26 '15 at 16:52
  • Although @devendra answer works, following @DrCord suggestion, it should be '#attributes' => array('class' => array('mybtn', 'mybtn-2')) Nov 25 '17 at 19:40

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