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From "Alan Neveu (Updated) (JIRA)" <>
Subject [jira] [Updated] (CB-520) WP7 Certification and the Back Button
Date Wed, 18 Apr 2012 15:40:44 GMT


Alan Neveu updated CB-520:

    Priority: Minor  (was: Blocker)
> WP7 Certification and the Back Button
> -------------------------------------
>                 Key: CB-520
>                 URL:
>             Project: Apache Callback
>          Issue Type: Bug
>          Components: WP7
>    Affects Versions: 1.6.1
>         Environment: VS.NET 2010 and WP7.1 emulator
>            Reporter: Alan Neveu
>            Assignee: Jesse MacFadyen
>            Priority: Minor
> I tried submitting my PG 1.5 app to the Windows Marketplace and it was rejected due to
WP7's requirements for the Back Button. I upgraded to PG 1.6.1 and I am inspecting how it
works with the hardware back button.  It seems to work much better, but my app is designed
so that it has a soft back button in the app in various places, and on WP7 the user can always
tap the hardware back button.  I am trying to use and it appears
to work, but it does something slightly different than actually tapping the hardware back
button does.  I have also tried using window.history.back and that works different yet.  I
am using JQueryMobile 1.1.0 and so I wind up doing quite a lot of $.mobile.changePage calls
to #Page id's, and because I use multiple .html files I also need to do some rel="external"
links or window.location.href= calls.  I think my needs are similar or the same as those of
other WP7 developers.  Here is what currently happens with PG 1.6.1 in a simple Page1/Page2
JQueryMobile app when using the hardware back button versus using,
vs. window.history.back:
> SCENARIO #1 - using hardware BackButton only
> Page 1 links to Page 2 using $.mobile.changePage("#Page2");
> BackButton tap - goes back to Page1 but page is requested again and reloaded from scratch
which is slow and the user loses any form data they had entered.
> BackButton tap - exits app (great!)
> SCENARIO #2 - hardware BackButton and
> Page 1 links to Page 2 using $.mobile.changePage("#Page2");
>; goes back to Page1 served from cache, which is fast and
form data is preserved.
> BackButton tap: nothing happens
> BackButton tap: Page1 is reloaded from scratch
> BackButton tap: exits app
> SCENARIO #3 - hardware backButton and window.history.back
> Page 1 links to Page 2 using $.mobile.changePage("#Page2");
> window.history.back(); goes back to Page1 served from cache.
> BackButton tap: Page1 is reloaded from scratch (DOH!)
> BackButton tap: exits app
> My Observations:
> 1) The hardware back button does not use the cached page - it reloads/re-requests the
page. This is kind of a drag but I think we have to just go with this because it is the behavior
that the Marketplace testers will be expecting and validating.
> 2) window.history.back() is giving better results than, but
still not the same as the hardware back button. I think apps will fail Marketplace certification
if they use either of these approaches for soft back buttons.
> 3) When going back to an external page (as opposed to a JQueryMobile #pageID), window.history.back
works but does not seem to do anything at all.  I say window.history.back
"works" but it is still the same result as in Scenario #3 above, which is not good.
> My recommendations:
> 2) Perhaps PhoneGap can enhance the WP7 implementation of so
that it works the same as the hardware back button. It should go back a page and reload that
page, and then pressing the hardware back button on Page 1 should exit the app.
> I mark this case as "blocker" priority because it is not possible to get a WP7 app certified
for the Marketplace unless the back button works exactly the way they want it to. It seems
that for WP7 we have to design our apps so as to keep the history as small as possible so
that the number of paths through an app are minimized. We need soft "back" buttons in iOS
and BlackBerry, and they are helpful for Android and WP7, and if we can get
to behave (on WP7) identical to the hardware back button, I think we will have forever solved
the WP7 back button issue.

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