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PhoneGap List Scroll Freeze

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  • PhoneGap List Scroll Freeze

    Hi Everyone,

    Wondering if anyone else has encountered this before I delve in further myself.

    Building a PhoneGap application and for the most part everything works fine but occasionally the ability to scroll on lists or panels "freezes". You can switch between panels, activate visible buttons (even log out) but on every panel you can't scroll beyond what is visible. So its like the scroll is completely frozen. The only way to recover is reboot the phone or close the app.

    This glitch is more likely if you refresh a panel card and as its refreshing you tap the screen or scroll up or down ( as an actual user might do while they are waiting for it to refresh).

    Anyone else encounter this?

    Thanks,

    Scott

  • #2
    Re: PhoneGap List Scroll Freeze

    Yes I have - its the Elephant in the Room with AA and Mobile - The issue is worse if you are persisting data to the device in local storage, the timing of coming from a panel say editing data then returning to the list panel just as the refresh occurs - it's all over.. - it's my biggest concern with my clients.
    Insanity: doing the same thing over and over again and expecting different results.
    Albert Einstein, (attributed)
    US (German-born) physicist (1879 - 1955)

    Comment


    • #3
      Re: PhoneGap List Scroll Freeze

      Hi Pete,

      Any workarounds you have come up with?

      Scott

      Comment


      • #4
        Re: PhoneGap List Scroll Freeze

        Well as I said Local storage is one hurdle, the other is anything that should appear in the header say search etc. is better in a silent panel and set as injectable contaner, then place them in the header and header data of the list layout, that's worked for me a few times - also if you are submitting the lists detail view - then returning to the list in another Panel, then ad a set time out after the save before the list appears.

        setTimeout(function() { },1000);
        Insanity: doing the same thing over and over again and expecting different results.
        Albert Einstein, (attributed)
        US (German-born) physicist (1879 - 1955)

        Comment


        • #5
          Re: PhoneGap List Scroll Freeze

          Hi Pete,

          Being doing some more playing around and here is another solution to add to the tool kit. The issue seems to occur a lot when you refresh a list and the "old" list is still visible or becomes visible before the new list data is rendered. If the user scrolls on the old data, when the new list is rendered it freezes (likely because on the phone the position of the finger and where it is vs. the expected row of the new list don't line up).

          Anyway, when you do a refresh or navigate back to a panel card, use this javascript statement first:

          {dialog.object}._listRemoveAllRows('YourListName');

          It wipes out the list so the user is presented with a blank screen and can't scroll. Only the new rows will be shown when rendered. Seems to cut down on the freezes.

          Cheers,

          Scott

          Comment


          • #6
            Re: PhoneGap List Scroll Freeze

            Hmm thanks - makes sense, anything to reduce the chances of freezing, I can tell you it does not take long before the client starts to crack it. It's a no no..
            Insanity: doing the same thing over and over again and expecting different results.
            Albert Einstein, (attributed)
            US (German-born) physicist (1879 - 1955)

            Comment

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