Intro

NextGEN Voting is a plugin for the wordpress plugin NextGEN Gallery plugin. Keeping this in mind made the task of extending easier. NextGEN Gallery hooks into wordpress functions, NextGEN Voting hooks into NextGEN Gallery.

By default, NextGEN Voting hooks into the gallery view, giving access to a function that uses the image id for lookup. The only reason we see nothing if we try to paste the same template code into a page other than the recommended “nextgen-gallery/view/gallery.php” is because that function is not given access in any other view.

How-to Add Access to Use the Function in the Image Browser Template

Open “wp-content/plugins/nextgen-gallery-voting/ngg-voting.php”,

Look for:

add_filter("ngg_show_gallery_content", "nggv_show_gallery", 10, 2);

Add After:

add_filter("ngg_show_imagebrowser_content", "nggv_show_imagebrowser", 10, 2);

Look for:

function nggv_show_gallery($out, $gid) {
	return $out.nggc_voteForm($gid, $buffer);
}

Add After:

function nggv_show_imagebrowser($out, $gid) {
	return $out.nggc_voteForm($gid, $buffer);
}

Now we have given access to the function and can paste the following code into “wp-content/plugins/nextgen-gallery/imagebrowser.php”:

<?php echo nggv_imageVoteForm($image->pid); ?>

Conclusion

I’ve tried to explain this in method in a way you can repeat an extend to suit your needs. By following the same logic and tracing the hooks, you can apply this however you might need.

You’ll want to keep “wp-content/plugins/nextgen-gallery/nggfunctions.php” open as a reference for what hooks are available. You can find hooks by searching for “apply_filters(‘”, it will be the first parameter.