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I’m developing an OAuth authentication flow purely in JavaScript and I want to show the user the “grant access” window in a popup, but it gets blocked.
How can I prevent pop up windows created by either window.open or window.showModalDialog from being blocked by the different browsers’ pop-up blockers?
The general rule is that popup blockers will engage if
window.openor similar is invoked from javascript that is not invoked by direct user action. That is, you can callwindow.openin response to a button click without getting hit by the popup blocker, but if you put the same code in a timer event it will be blocked. Depth of call chain is also a factor – some older browsers only look at the immediate caller, newer browsers can backtrack a little to see if the caller’s caller was a mouse click etc. Keep it as shallow as you can to avoid the popup blockers.