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December 27, 2015 17:39
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onbeforeunload support for js navigation (via hashchange, such as backbone.history, etc)
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var cancelNavigate; | |
$(window).on("hashchange", function(ev) { | |
if(cancelNavigate) { | |
cancelNavigate = false; | |
return false; | |
} | |
if(window.onbeforeunload) { | |
var ok = confirm(window.onbeforeunload()); | |
if(ok) { | |
window.onbeforeunload = null; | |
return; | |
} else { | |
cancelNavigate = true; | |
window.location.href = ev.originalEvent.oldURL; | |
return false; | |
} | |
} | |
}); |
Thanks for this
This doesn't cover cases where window.onbeforeunload()
is defined but returns null
, meaning it should not prevent navigation. I would change line 8 to:
var msg = window.onbeforeunload();
if (!msg) return;
var ok = confirm(msg);
if (ok) {
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It does not work on IE, because it does not have the oldURL property.. for these case, you have to manually track the previous href.