I usually override a form template this way.

 * Implementation of hook_theme().
function MODULE_theme() {
  return array(
    'user_login' => array(
      'render element' => 'form',
      'template' => 'user_login',
      'path' => drupal_get_path('module', 'MODULE').'/templates',

I create templates/user_login.tpl.php in my module folder; then, I can override the form.

I tried overriding a node comment form this way, but it didn't work: The node comment form didn't use my custom template file.

I have googled a lot, but I got nothing about overriding a node comment form template.

How can I force Drupal to use a template file for the node comment form?

2 Answers 2


In Drupal 7, and in the case of the user login form, your trick works because the form doesn't set the #theme property; in that case, Drupal will use the theme function whose machine name is equal to the form ID. (For the login for, that is user_login.)
That is not true for the comment form, for which its form build (comment_form()) sets the #theme property.

$form['#theme'] = array('comment_form__node_' . $node->type, 'comment_form');

There isn't a match between the machine name of the theme the form builder wants to use, and the comment-edit form ID; the latter is comment_node_CONTENT_TYPE_form, not comment_form__node_CONTENT_TYPE. If you were defining a comment_form theme function, that should work.

In Drupal 6, there is no #theme property for comment_form, which is the form ID of the comment edit form.

  • first, thanks your edit my question to chang some english grammar problem. My english is so terrible. I have read your reply many times. Your idea is : the form_id for node comment form , I should use comment_form ?
    – Rylyn
    Commented Aug 3, 2013 at 1:51
  • theme_comment_form() should be the theme function that Drupal would use for the comment edit form.
    – apaderno
    Commented Aug 3, 2013 at 9:05

Following code will allow you to use comment-form--node-forum.tpl.php template:

 * Implements hook_theme().
function hook_theme($existing, $type, $theme, $path) {
  return array(
    "comment_form__node_forum" => array(
      'render element' => 'form',
      'template' => "comment-form--node-forum"

Replace 'forum' to your content type.

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