How to add a parameter to the URL?

Question

My current URL is: http://something.com/mobiles.php?brand=samsung

Now when a user clicks on a minimum price filter (say 300), I want my URL to become

Answer 1

use var urlString = window.location to get the url

check if the url already contains a '?' with urlString.indexOf('?'), -1 means it doesnt exist.

set window.location to redirect

this is like 101 of javascript. try some search engines!