[Plugin: Taxonomy Widget] Dynamic link instead of javascipt link

/%category%/%postname%/

changed to original link code,This time category taxonomy working well but other two custom taxonomies are nor rewriting the link structure

for File format taxonomy with fileformat slug fileformat/ai/normally works well.
same problem with License taxonomy with license slug
after changing back to original link code it gives /?file_format=ai which is not rewriting to at-least /file_format/ai/

created with the help of this plugin

changing the code again works but not flexible

function get_query_var_name( $taxonomy ) {
			if ( $taxonomy === 'file_format' )
				return 'fileformat';
			if ( $taxonomy === 'category' )
				return '?cat=';
			if ( $taxonomy === 'post_tag' )
				return 'tag';
			else
				return $taxonomy;
		}

if ( this.options[this.selectedIndex].value != 0 && this.options[this.selectedIndex].value != -1 ) {
				location.href = "{$url}/" + this.name + "/" + this.options[this.selectedIndex].value;
			}