[whatwg] Onpopstate is Flawed

Jonas Sicking jonas at sicking.cc
Mon Jan 31 18:32:33 PST 2011

On Thu, Dec 23, 2010 at 6:18 PM, Henry Chan
<henry.fai.hang.chan at gmail.com> wrote:
> It fixes the bit where back/forward before onload doesn't fire onpopstate.
> But no, it still doesn't let us detect inital onpopstate.  And back/forward
> buttons don't work properly until onload.  A workaround would be to assign
> the handlers to the <a> tags at onload but again that's not feasible for my
> site.  I need it domready.
> Please make onpopstate fire as early as possible in the navigation sequence.
>  And drop the pending state object.  I need exactly each firing.  Not just
> the last one.

Would the following behavior solve your issue:

If pushState or replaceState is called before the initial popstate,
simply don't fire the after-onload-popstate.

If the back button is pressed (or history.back() is called) after a
pushState/replaceState, but before onload, fire a popstate for the
newly transitioned to state. Still leave the after-onload-popstate

I.e. if the webpage calls pushState or replaceState before onload
fires, then it is deemed that the page has transitioned to the new
state and no after-onload-popstate is needed.

This behavior makes the most sense to me and allows the page to start
handling state transitions before the page finishes loading.

/ Jonas

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