I am attempting to add css classes to the body depoendant on what the page contains.

I am using the following...

function myTheme_preprocess_html(&$vars){
    //code here
    $vars['classes_array'][] = 'a-new-class-for-a-node';

I cannot get this to fire or add anything to the page. It will not drupal_set_message, echo or more importantly add any classes to the body tag.

What am I doing wrong here please? I am using Drupal 6.

  • Which id the machine name of your theme? Did you clear the cache?
    – arrubiu
    Dec 5 '14 at 13:43
  • add keyword function before myTheme_preprocess_html(&$vars), ie function myTheme_preprocess_html(&$vars){...} Dec 5 '14 at 13:50
  • Thank you. I do already have function in the code. It is still not doing anything. I also have the name of my theme where it says myTheme_preprocess_html. Anything else I am missing out on here?
    – daktau
    Dec 5 '14 at 14:14
  • If you just added keyword function then you need to clear the cache Dec 5 '14 at 14:53
  • Thank you. I already always clear all caches when editing any code. Still nothing is happening. Can you suggest something that I can put in the function so that I know it is being called?
    – daktau
    Dec 5 '14 at 14:54

I might be terribly wrong here, but there appears to be no such hook for Drupal 6. If so, it will never fire.

See https://api.drupal.org/api/drupal/6/search/hook_preprocess_html.

Perhaps you're backporting a theme from D7?

  • I can also not find the preprocess html hook for Drupal 6. +1. So the correct hook to add classes to body be template_preprocess_page? Dec 6 '14 at 5:16
  • Thank you. I added some code to page.tpl.php to add the classes. I will investigate using template_preprocess_page.
    – daktau
    Dec 8 '14 at 20:25
  • J.Reynolds It seems so. @daktau As long as the code isn't anything beyond a simple if and print statements. Complex logic should go in hooks and theme functions, as you already know.
    – Plamen
    Dec 9 '14 at 15:41

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