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I have made a wordpress plugin following standard wordpress tutorials. This plugin add a file upload to the comment form by using simply this function:

add_action( 'comment_form_logged_in_after', array(&$this, 'add_to_comment_form') );

. But when I activate some themes it won't show on the comment form.

Any Help how to make it show on comment form?

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Are those themes using comments_template rather than comment_form to display the form? – mrwweb May 25 '12 at 19:40
Sorry I am new to wordpress I don't know exactly how to find it, but it has inside a comments.php file. – albanx May 25 '12 at 19:50
I see a comments_template() inside single.php – albanx May 25 '12 at 19:59
I think it is using comment_form because I see it in the comments.php: <?php do_action('comment_form', $post->ID); ?> – albanx May 25 '12 at 20:10
What software do you use to edit your code? It should be able to perform a global search in all your theme files... – brasofilo May 25 '12 at 20:17

comment_form_logged_in_after action hook was added to WordPress When comment_form() was introduced at version 3.0.

So the themes where your plugin doesn't work are probably outdated themes that don't use comment_form.

share|improve this answer
this is wordpress 3.2 – albanx May 25 '12 at 19:51
It's not about the version of WordPress, it's about the function the theme uses to display the comment form. The old way didn't use the action that you're hooking to. – mrwweb May 25 '12 at 20:52
Mrwweb is correct and as i posted the themes are out dated not the WordPress version. – Bainternet May 25 '12 at 22:34

I solved by adding these actions to comments.php of the theme:

<?php if ( is_user_logged_in() ) : ?>
//...................theme code
<?php do_action( 'comment_form_logged_in_after', $comment_author, $user_identity );  ?>


do_action( 'comment_form_after_fields' ); 

Hope this help someone and also for theme makers

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