Question

In WordPress I’m trying to enqueue a script for a jQuery gallery only for posts that got attachments.

I got this simple function that works for single posts:

function gotImages()
{
    $attachments = get_children( array('post_parent' => get_the_ID(), 'post_type' => 'attachment', 'post_mime_type' => 'image') );
    return ( !empty($attachments) ? true : false );
}

When I call gotImages() in functions.php it returns true for a single post with attachments but false for the home page with several posts if the first post doesn’t have attachments.

How can I modify this so it works for more than one post i.e. on the home page where I’m displaying 10 posts?

Thanks!

Answer 1

Finally worked out a rough working solution. It’s probably not the final version but here’s my solution for anyone who might be interested.

function gotImages()
{
    global $wp_query;
    $posts = $wp_query->posts;

    if ( empty( $posts ) )
    return $posts;

    $searchImages = '~<img [^>]* />~';

    foreach ($posts as $post) {
        $content = $post->post_content;
        preg_match_all( $searchImages, $content, $countImages );
        $images += count($countImages[0]);
    }
    return ( $images >= 1 ? true : false );
}

This function if put in functions.php will read through the content of the current loop and scan it for <IMG> tags. If one or more tags are found it returns true otherwise false.

Now I can use this to conditionally enqueue scripts or stylesheets depending on if a post got any images.

For example like this:

if( !is_admin() && gotImages() == true ) :
    wp_register_script('fancybox', get_stylesheet_directory_uri() . '/libs/fancybox/jquery.fancybox.pack.js', array('jquery'), false, true);
    wp_register_script('fancybox.init', get_stylesheet_directory_uri() . '/js/init/lightbox.init', array('fancybox'), false, true);

    wp_enqueue_script('fancybox');
    wp_enqueue_script('fancybox.init');
endif;

I’m not sure yet how ‘expensive’ this function is but the site I’m working on it quite small so for now it’s not a big deal of it adds a few ms to the process time.