use localStorage across subdomains

javascript subdomain local-storage
JoJo picture JoJo · Oct 26, 2010 · Viewed 102.2k times · Source

I'm replacing cookies with localStorage on browsers that can support it (anyone but IE). The problem is site.com and www.site.com store their own separate localStorage objects. I believe www is considered a subdomain (a stupid decision if you ask me). If a user was originally on site.com and decides to type in www.site.com on her next visit, all her personal data will be inaccessible. How do I get all my "subdomains" to share the same localStorage as the main domain?

Answer

Mayank Jain picture Mayank Jain · Oct 11, 2011

This is how I use it across domains...

  • Use an iframe from your parent domain - say parent.com
  • Then on each child.com domain, just do a postMessage to your parent.com iframe
  • All you need to do is setup a protocol of how to interpret your postMessage messages to talk to the parent.com iframe.

I hope it helps :)

Related questions

Regular Expression - Extract subdomain & domain

I'm trying to form a regular expression (javascript/node.js) which will extract the sub-domain & domain part from any given URL. This is what I ended up with: [^(?:http:\/\/|www\.|https:\/\/)]([^\/]+) Right now, I'm just considering http, https for …

Read More
Get the domain name of the subdomain Javascript

How i can get the domain name example.com from the set of possible subdomains sub1.example.com sub2.example.com sub3.example.com using javascript ...?

Read More
How to get a subdomain using window.location?

If I have a hostname such as: http://sample.example.com and in Javascript I do window.location.hostname, would I get "example.com" or "sample.example.com"? If not, how would I be able to get sample.example.com?

Read More