How can I add a button to quicktags-toolbar?

Question

I would like to add a button to this toolbar, right of "fullscreen":

The button should add this: „“

If text is selected, it should get around the text, like this: „selected text“

How can I add such a button to the ed_toolbar (class: quicktags-toolbar)?

Answer 1

Try adding the following code in your function.php

add_action( 'admin_footer-post-new.php', 'wpse_64665_add_quick_tag' );
add_action( 'admin_footer-post.php',     'wpse_64665_add_quick_tag' );
function wpse_64665_add_quick_tag() { ?>
    <script type="text/javascript">
        edButtons[edButtons.length] = new edButton( '„“', '„“', '„', '“', '' );
    </script><?php
}