Possible to detect if a user has multiple tabs of your site open?

Question

I\'m just thinking about the whole site registration process.

A user goes to your site, signs up, and then you tell him you\'ve sent him an email and he needs to ve

Answer 1

You can stop the page functionality when user opened another tab or another window or even another browser

$(window).blur(function(){
    // code to stop functioning or close the page  
});