i have no idea about plugin development so my solution is kind of an ad hoc one and i didn’t actually have to change anything in the plugin but im happy to explain what i did.
i added this to the functions.php:
function admin_register_head() {
echo “<link rel=’stylesheet’ type=’text/css’ href=’path to calendar widget style sheet’ />\n”;
echo “<script type=’text/javascript’ src=’path to calendar widget js’></script>\n”;
}
add_action(‘admin_head’, ‘admin_register_head’);
i also added this to wp-admin/admin-footer.php:
<script>$(‘:date’).dateinput({format:’yyyy-mm-dd’});</script>
it would be much better if it was all self-contained within the more-fields plugin, maybe this is something someone else who has knowledge of plugin development could do.
hopefully this solution can be of use to other people. i tested it on Safari (Mac and PC),Firefox (Mac and PC), Chrome (Mac and PC) and IE (PC).