yeah it seems ‘this part’ is not finished ??
Well you can do that (but it’s baaaad and harcoding) :
go wp-include/media.php line 1380 insert something like that:
// make a select if is a taxonomy
if ($field['taxonomy'] == 1){
$terms = get_terms('YOUR_TAXONOMY', 'orderby=name&hide_empty=0');
$item .= "<select class='select-".$term->slug."' id='$id_attr' name='$name' $readonly required>";
$selected = 'selected';
$item .= '<option value="" '. $selected.'>Choose...</strong></option>';
foreach ($terms as $term) {
$selected = ($term->slug == $field['value'] ) ? 'selected':'';
$item .= '<option value="'. $term->slug .'" '. $selected.'>' . $term->name . '</option>';
}
$item .= "</select>";
But the cleanest way is to change the text field with jQuery in your theme or plugin – because here you will loose code after an update of WP…
