jQuery basic logic for a search as the user type

filterDropDown.js

function filter_users_dropdown() {

  	search = $('#from').val().toLowerCase();

		$('#users-dropdown li').each(function(index) {
			
			var value = $(this).text().toLowerCase();

			n = value.search( search );

			if(n>=0) {
			
				$(this).show();
			} else {
				$(this).hide();
			}
		});	
	}