What is the best way to make two web pages communicate between each other back and forth? I will be using HTML and Javascript. Basically I want to login on a web page and I should be able to see who has logged in from the second page. It's just a test app so just need a quick solution.
What is the best way to make two web pages communicate between each other back and forth?
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If you just wanted two pages to communicate in the same browser session on the same domain, you could use localStorage -- it's basically a key-value store with some limits on size (rough estimate 5 MB but it varies). An event is fired when you write to localStorage so you can have a listener on one page (and write to it from another page).
However, the constraint of needing to see who has logged in from a second page means JavaScript alone client-side is not going to be able to solve the problem. You'll need something on the server-side that you can poll (or use a push mechanism). You could use JavaScript there to continue to update a page with login data. But it needs to talk to the server to know who logged in.