I am looking for a way to edit the link that get inserted in the editor when the user choose to add a media. The goal would be to add a class with the media type (pdf) in the link.

I know how to get the mime type but I am not sure which hook to use to retrieve the link before it gets inserted. Could you point me in the right direction?



So thanks to @amritanshu and @wycks github's code, here is the solution for those in need to add a class with the media type to the attachment url before it gets inserted in the editor :

if ( ! function_exists( 'epc_add_class_pdf' ) ) :

    function epc_add_class_pdf( $html, $id ) {

        $attachment = get_post( $id );
        $mime_type = $attachment->post_mime_type;

        // I only needed PDF but you can use whatever mime_type you need
        if ( $mime_type == 'application/pdf' ) {
            $src = wp_get_attachment_url( $id );
            $html = '<a class="pdf" href="'. $src .'">'. $attachment->post_title .'</a>';

        return $html;
add_filter('media_send_to_editor', 'epc_add_class_pdf', 20, 3);

Here's a shorter way to do it (PHP 5.4+):

add_filter( 'media_send_to_editor', function( $html, $send_id, $attachment )
  $class = wp_check_filetype( $attachment['url'] )['ext'];
  return str_ireplace( '<a href', sprintf( '<a class="%s" href',$class ? $class : 'unknown' ), $html );
}, 10, 3 );

where we get the attachment's info from the third input argument.

We could also use the mime type data, from wp_check_filetype(), instead of the extension.


This is not the answer but just the hint.

media_send_to_editor should be the hook that should help you. Not sure how but came across this while searching for my problem

I would have commented but still 4 points short, so unable to comment

All the best

  • @Pipo My pleasure.. Any idea how to do that for existing media. This will only work when you add new media but not for the existing media. – terminator Jul 8 '15 at 13:22
  • I don't think this is the best answer as I don't know much about SQL but I would try to use the REPLACE function of mysql to add a class after the end of the href. Of course this is kind of a hack and will only works if you can find a similarity in the links you want to replace (for example: replacing .pdf"> by .pdf" class="your-class"> in the relevant tables). But this is just an idea... – Pipo Jul 8 '15 at 14:43

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