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I've been doing a lot of research and I've yet to work this out. Can you add in a custom option in the Attachment Display Settings (part of Insert Media dialog in post editor)?

What I'm after is the ability to add an anchor with a class around all images in posts.

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advancedcustomfields.com can do this, when you create a new field group for you extra field, choose the Attachment location and it will display the extra field in the Insert Media dialog and on the attachment edit page too –  passatgt Jan 19 at 14:09

1 Answer 1

This will add a field in the attachment edit screen for applying a class to the img tag.

function IMGattachment_fields($form_fields, $post) {
    $form_fields["imageClass"]["label"] = __("Image Class");
    $form_fields["imageClass"]["value"] = get_post_meta($post->ID, "_imageClass", true);
    return $form_fields;
}
add_filter("attachment_fields_to_edit", "IMGattachment_fields", null, 2);
function my_image_attachment_fields_save($post, $attachment) {
    if ( isset($attachment['imageClass']) )
    update_post_meta($post['ID'], '_imageClass', $attachment['imageClass']);
    return $post;
}
add_filter("attachment_fields_to_save", "my_image_attachment_fields_save", null, 2);
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