On 3 avr, 00:43, Vitali Lovich <[email protected]> wrote:
> Here's the problem: This is the way you normally popup a confirmation
> dialog.
...when the user navigates *away* from your app, not *within* your app
(which doesn't involve "unloading" the page, as GWT apps are "one-page
apps")
> The problem, if I'm not mistaken (I haven't looked into history in a while),
> is that history is done through a hidden iframe,
Only for IE, on other browsers it just sets $wnd.location.hash (modulo
some tweaks/hacks to workaround a few bugs here and there)
> thus when the user hits
> back, it's quite possible that the window close event won't get generated
> (the browser will simply load the iframe).
When navigation *within* your app, the HTML page isn't "unloaded", so
I can assure you that the "window close" event (actually
onbeforeunload and onunload at the javascript level) won't be called
(except in some rare cases in IE, after you typed a new history token
in the location bar, AFAICT)
> Try & see if it works. If it doesn't, then you'll have to actually extend
> the GWT code itself (History.java) to add this feature. Shouldn't be too
> difficult.
Oh yes it'll be. It wouldn't be hard adding a confirm dialog before
newItem(), back() or forward() is actually called (but you coul just
do that from your code, eventually wrapping History methods within
your own history class); but when reacting to changes in response to
the browser's back/forward buttons/menu items, the token will already
have changed and you won't know whether it was because of a "back",
"forward" or "typed into location bar" (or "from a bookmark") action,
so you could eventually prompt the user, but you won't know for sure
what to do next (forward() ? back() ? and you cannot "explore" the
history to see what URL would get before/next)
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