Using Drupal 8 and Bootstrap sub-theme.

I see that classes are being added to my divs in the page template file using the following:

<section{{ content_attributes.addClass(content_classes) }}>

That's great. But what if I wanted to add additional classes to these div tags. How would I do that...in my .theme file somehow?



In your template file, you could find the set content_classes and add another class name to the list.

  set content_classes = [
<section{{ content_attributes.addClass(content_classes) }}>


In your .theme file

function themename_preprocess_html(&$variables) {
  $variables['content_attributes']['class'][] = 'class-name-other';

Note: This preprocess is for the html.html.twig file, you need to use the correct preprocess depending on your template file name.

If it's the node.html.twig then use function themename_preprocess_node(&$variables)

If it's the page.html.twig then use function themename_preprocess_page(&$variables)

  • In option 2, once this new class gets added in array, then we need to add that class to that particular div or element in .tpl.php Or twig file, right? This I am asking just for my understanding/knowledge. Thanks.
    – CodeNext
    Aug 22 '16 at 8:37
  • 1
    @CodeNext yes that is correct, you would do <div {{ content_attributes }}> ...... </div> or some element <p {{ content_attributes }}> ...... </p>, <body {{ content_attributes }}> ...... </body>
    – No Sssweat
    Aug 22 '16 at 8:45

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