Get root domain from location.host
javascript, string-parsing
Solution
Given the extremely low likelihood that our domain would ever change from anything other than .com, let alone to a SLD, I coded something like this in.
var temp = location.host.split('.').reverse();
var root_domain = '.' + temp[1] + '.' + temp[0];
The overhead and maintenance of maintaining a TLD or SLD list and comparing against it is not worth the trade off for us.
Problem
There are a lot of SO questions that seem to address variations of this question. But they tend to be complex regex answers and I am hoping I can find something simpler. Given location.host values of ``` foo.mysite.com app.foo.mysite.com mysite.com ``` How can I get the root domain `mysite.com`? I could do something like finding the second to last `.`, but this seems ugly and wouldn't work for any TLD's like `.co.uk`. If jQuery has an object that contains this information I am happy to use it. My goal is to create cookies that exist across all subdomains. To do this I need to find `.mysite.com`. I'd prefer not to hardcode it.