Add content type to body class

Question

I want to add a body class for the content type of each node. Drupal already provides this, but it isn't always consistent between the Node view, the Node/Add view and the Node/Edit view. This makes theming difficult.

Here is my code in template.php

function MYTHEME_preprocess_html(&$variables) {

    // Add Content type name to classes
    $content_type = $variables['page']['content']['system_main']['type']['#value'];
    $content_type_class = 'content-type-'.drupal_html_class($content_type);
    $variables['classes_array'][] = $content_type_class;

}

It works but I get this error message:

Notice: Undefined index: type in wintheme_preprocess_html()

On Stack Exchange, it says the best approach is to use Isset().

If I do this, the error message goes away, but so does the class.

How can I keep my class working without the error message.

Answer 1

The problem is you're trying to use the same system_main content type variable that's not always defined. Try this instead:

$node = menu_get_object();
$type = isset($node->type) ? $node->type : 'none';
$type = ($type == 'none' && arg(0) == 'node' && arg(1) == 'add') ? arg(2) : $type;
$content_type_class = 'content-type-'.$type;
$variables['classes_array'][] = $content_type_class;

That should give you a $classes_array var with either "content-type-TYPE" or "content-type-none" for pages that aren't associated with nodes.

Answer 2

Here's the solution for your problem.

@Shawn Conn : menu_get_object is return none on index/home page because menu_get_object work as route page requests to code based on URLs. See : function menu_get_object

So finally:

Put below code line into your template.php file in before closing bracket of wintheme_preprocess_html.

//Get current exist nodes content type and append into array
$nodType = node_type_get_types();
if(is_array($nodType)) {
   foreach ($nodType as $types) {
      $vars['classes_array'][] = "content-type-".strtolower(drupal_clean_css_identifier($types->type));
   }
}

Hope this would solve your problem. Further, if you have used theme like Bootstrap, Omega, etc. then we need to work out differently.

Let me know if you face any query/concern regarding this.

Thanks!