javascript - pop on page close? -


this question has answer here:

in effort reduce shopping cart abandonment, pop window offering 5% coupon code when user goes close shopping cart page.

i've seen these, , yes can annoying, can't seem locate code doing this.

there window event called onbeforeunload. can return string in event , echo string user , prevent window closing. can like:

window.onbeforeunload = function( ) {     return 'are sure want close window?'; }

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