New hook for adding content after each comment

[lancewillett]

Similar to #18561 (which is for a new "after post" hook) add a hook that fires after each comment output with wp_list_comments.

[codeclarified]

Added a hook to class-wp-walker.php - due to the callback functions on comments this was the only reliable location I could find to add such a hook without worrying about it being dropped due to a custom callback, and still keeping a nested reply from duplicating the content after the levels start closing

[chriscct7]

Thanks @mikehansenme

[DrewAPicture]

@MikeHansenMe We'll need a hook doc to go with the action proposed in 23634.2.diff​.

[MikeHansenMe]

Completely forgot about that.. my bad. I will get it added. Thanks @DrewAPicture.

[MikeHansenMe]

with Docs

[DrewAPicture]

Thanks @MikeHansenMe, I'll take a look.

[DrewAPicture]

I'm not sure about the placement of the hook. In comment:1 @codeclarified mentioned that it was the only reliable place to put it, and if that's the case, then this really doesn't fire after a comment has been displayed.

[lukecavanagh]

Okay if you apply the patch from @MikeHansenMe and add a echo "Hello Name";. It will just echo out on the parent itself rather then displaying on the child. So it seems like adding in a after_element action into class-wp-walker.php woukld make more sense. So that it could be used for menus and comments etc. Thoughts?

[keesiemeijer]

after_comment filter

[keesiemeijer]

As a proof of concept patch 23634.4.patch​ doesn't add the hook inside the WP_WALKER class. It does add a method start_el_after that the child classes can use to add content after the element. Because this method is called right after the start_el method you can insert content before the end tag (and child elements if they exist).

<ol class="comment-list">
	<li id="comment-1" class="comment">
			<article id="div-comment-31" class="comment-body"> ... </article>

			<!-- Comment after is inserted here. -->

			<ol class="children"> ... </ol><!-- #child elements-## -->
	</li><!-- #comment-## -->
</ol>

I've added the start_el_after method to the Walker_Comment class with a filter to add content. Now you can use the filter like this:

add_filter( 'after_comment', 'add_content_after_comment', 10, 3 );

function add_content_after_comment( $comment, $depth, $args ) {
        return $comment . '<p>Inserted content after comment.</p>';
}

An alternative is to ditch the extra method (in WP_WALKER) and add the filter directly in the start_el method of the Walker_Comment class.