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the condition is:

there's a wordpress site that has 8 categories, and each category has sub-category, and each subcategory has several posts (and still will be updating/counting) :

  • Category A - 8 subcat
  • Category B - 5 subcat
  • Category C - 4 subcat
  • Category D - 3 subcat
  • Category E - 2 subcat
  • Category F - 1 subcat
  • Category G - 5 subcat
  • Category H - 4 subcat

The body_class() function is already exist in header, and I want to make

  • Each category has different background image and custom header (ex: instead of Browsing the "xx" Category text- i'll be using custom words/image)
  • For each single post page belong to certain category, the style is inherit. (i dont know how to explain that on english - but what I want to achieve is: A single post that belong to category A have the same style with Category A archive pages.

I did add:

    .category-A 
    { /* css here */ }

    .category-B
    { /* css here */ }

    etc

but for each single page, the styling did not work..

and to tweak single page that belong to category who- I don't know the code.

So... there's pretty much the rough description of my problem, though. Please help :(

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2 Answers 2

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Category archive pages can be styled using the body class as per your example - WordPress does this out of the box. But for single pages, you need to add this to functions.php: 

function add_category_name($classes = '') {
   if(is_single()) {
      $category = get_the_category();
      $classes[] = 'category-'.$category[0]->slug; 
   }
   return $classes;
}
add_filter('body_class','add_category_name');

This will add the body class to the single post, and you can style it with CSS. In order to change the header text, you'll need to use a conditional statement in your archive page template. 

if (in_category('this')) { 
    echo 'this';
} elseif (in_category('that')) { 
    echo 'that';
} else { }
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  • Yes but doesn't work on the home page archive.
    – Brad Dalton
    Dec 30, 2021 at 13:34
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From what I understand you would like to add a class based on the current category to the <body> of posts and category archives.

There is example code on the body_class codex page which achieve this:

To add a category class to single post pageviews and template files, add the following to the functions.php.

// add category nicenames in body and post class
function category_id_class($classes) {
    global $post;
    foreach((get_the_category($post->ID)) as $category)
        $classes[] = $category->category_nicename;
    return $classes;
}
add_filter('post_class', 'category_id_class');
add_filter('body_class', 'category_id_class');
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