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I have a custom field on a category where you can add an image. I have it as a background image to show on the category's archive page, like so:

archives.php

<body style="background:url('<?php echo z_taxonomy_image_url($cat->term_id); ?>')">

It uses the Categories Images plugin to achieve this.

Is there a way for the posts in this parent category to inherit this background image? something like $cat->parent_id?

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So example.com/category/parent and example.com/category/parent/child should have the same background? –  developdaly Dec 3 '12 at 13:50
    
Exactly yeah, I would like the /child to inherit or reuse the image which is associated with the /parent –  dodgerogers Dec 3 '12 at 13:56
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1 Answer

up vote 1 down vote accepted

You can use this function to output the parent category ID and then style off of that.

<?php
function wpse_74737_category_top_parent_id($catid) {
    while ($catid) {
        $cat = get_category($catid);
        $catid = $cat -> category_parent;
        $catParent = $cat -> cat_ID;
    }
    return $catParent;
}

And then call this in your body class: <?php echo wpse_74737_category_top_parent_id( $cat->term_id ); ?>

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Hi developdaly this seems great! I don't think im calling it correctly in the single.php file though: <body id="<?php echo z_taxonomy_image_url($catParent); ?>"> –  dodgerogers Dec 3 '12 at 14:03
1  
Use <?php echo wpse_74737_category_top_parent_id(); ?> in single.php. –  developdaly Dec 3 '12 at 14:04
    
Hmm can't get this to work, I have tried to print out the output of this fucntion but it comes up with nothing. What should this be outputting? something like domain.com/wp-content/uploads/2012/12/Virus_IQ1.jpg? –  dodgerogers Dec 3 '12 at 14:24
    
No, you should be getting the ID of the parent category. I forgot to mention that you need to provide the ID of the current category. So something like, <?php echo wpse_74737_category_top_parent_id( $cat->term_id ); ?>. –  developdaly Dec 3 '12 at 14:59
    
hey Developdaly I still need to fiddle with it but if you post the comment above as an answer ill gladly tick it. –  dodgerogers Dec 3 '12 at 15:35
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