Remove Subdomain From URL With JavaScript

To remove a subdomain from the current URL in the browser is easier than you think. In my situation, I need to remove the mobile subdomian so that I can set a cookie that can be used on both versions of the website domain. i.e. mobile.sample.com and www.sample.com. I could have hardcoded the domain, but when you’re working with test and dev environments, it’s better to make it dynamic. Here’s what I came up with:

var separate = window.location.split('.');
separate.shift();
var currentdomain = separate.join('.');

The .split() method separates the url into an array of substrings, using the dot as the separator. http://mobile ‘.’ sample ‘.’ com

var separate = window.location.split('.');

Use the shift() method to remove the first element in the url array. In this example, it’s ‘http://mobile’.

separate.shift();

Here, I’m setting the variable currentdomain to equal the result of re-joining the remainder of the url array elements using the .join() method.

var currentdomain = separate.join('.');

Now I can use the jQuery cookie plugin to set a cookie that can be used on both versions of the website.

$.cookie('mobile', 'true', {path: '/', domain: currentdomain});