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i tried this shortcode:

[gallery class="fancybox" link="file" columns="5"]

But the class="fancybox" isn't been added to the a href tag of each image.

How can i add class="fancybox" to each a href tag??

ps: where is the source code of gallery?

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ok i am testing with add_filter('wp_get_attachment_link' but how do i make sure it only applies to the shortcode Gallery? – alex Mar 9 '12 at 11:03
Ok i added this but i like to make sure it only applies to the gallery shortcode, how do i do this? function my_get_attachment_link($html) { $postid = get_the_ID(); $html = str_replace('<a', '<a class="fancybox"', $html); return $html; } add_filter('wp_get_attachment_link', 'my_get_attachment_link', 10, 1); – alex Mar 9 '12 at 11:17
Why not change the javascript selector that fancybox works on? – sanchothefat Mar 9 '12 at 12:08
@sanchothefat is on the right track. You're looking at the problem wrong. You're increasing the overhead of processing the gallery for no good reason. – Dan Jan 31 '13 at 16:25
up vote 6 down vote accepted

You can use javascript/jquery to solve this.

When you insert a gallery in a wordpress posts, the whole gallery is wrapped by a div with id like "gallery-1" but also a class that's always "gallery". Also, every item is surrounded by two other "dl" and "dt", with class "gallery-item" and "gallery-icon" respectively.

So, you can just use jquery to match every link inside those classes, and add whatever lightbox script you want.

If it's fancybox, i think something like this should work:

jQuery(".gallery-icon a").fancybox();

You can be more specific, matching css classes .gallery .gallery-item .gallery-icon in that order and then the a (for the link).

If you want users can navigate between images as a gallery, then use:

jQuery(".gallery-icon a").fancybox().attr('rel', 'gallery');

If you want more grained control (for multiple galleries on the same page), check this response.

Or use a simple plugin that use the same approach from Viper007Bond, that does clean and nicely, but using colorbox instead.

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jQuery runs in no-conflict mode in WordPress. I changed your code accordingly. Oh, and welcome to WordPress Stack Exchange! – toscho Mar 9 '12 at 18:40
jQuery(".gallery-icon a").fancybox().attr('rel', 'wp-gallery-fancybox');

Gives all links the same rel attribute, this way the user will be able to slide between the images.

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to build on @kaiser here -

Each gallery ideally would get a unique id, but now that posts and pages can have multiple galleries, its not easy with php to give each gallery a unique rel identifier.

jQuery('.gallery').each(function (g) {
    jQuery('a', this).attr('rel', function (i, attr) {
         return attr + ' gallery-' + g;

Mind your selectors, your theme might rewrite them. This is discussed in depth on http://kaspars.net/blog/wordpress/add-rel-attribute-to-each-gallery-post

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