How to know if user is logged in to my SAAS from different tab

Question

I have a SAAS software with Laravel 5.2 (PHP).

Tab A - Is my SAAS website.

Tab B - Is my client website.

SAME BROWSER

My client log-in to my system on Tab A.

I want to present something on Tab B(Client website) but only if I know that he is logged-in in Tab A or have session/cookie because of the logged-in on Tab A

How can I do it / Detect it?

Answer 1

可能最好的方法是允许服务器发送 websocket 消息，通知所有其他浏览器选项卡有关登录事件的信息，例如，这可以触发页面重新加载。