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cordova - How do I disable Android Back button on one page and change to exit button on every other page

I am developing an Android application using Phonegap that interacts with my Drupal site. I have re-assigned the Android "Back" button to prompt the user to log off from the Drupal server however, I just want it disabled on the login page (for obvious reasons). I can get it to work but only until the user logs out then once on the login page the button remains re-assigned as a logoff button. Here's the code I have so far:

   <head>
         <script>
        /* Wait until device is ready to re-assign Back button */
        document.addEventListener("deviceready", onDeviceReady, false);
        function onDeviceReady() {
            document.addEventListener("backbutton", onBackKeyPress, false);
        }
        function onBackKeyPress() {
            /* If the current page is the login page, disable the button completely (aka do nothing) */
            if ($.mobile.activePage.attr('id') == 'login_page') {
            }

            /* Else, execute log off code */
            else {
                if (confirm("Are you sure you want to logout?")) {
                    /* Here is where my AJAX code for logging off goes */
                }
                else {
                    return false;
                }
            }
        }
        </script>
</head>

The problem is that the Back button doesn't get re-assigned. I cannot figure out a way to re-run the above code when the user logs out and ends up back on the login page.

If anybody is willing to provide a solution for this I will be very grateful!

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by (71.8m points)

deviceready is important. If not used, sometimes you can get blocking Back button, sometimes not. Often in debug it works, in production no.

document.addEventListener("deviceready", onDeviceReady, false);
    function onDeviceReady() {
        document.addEventListener("backbutton", function (e) {
            e.preventDefault();
        }, false );
}

EDIT 2013-11-03 Common mistake is that development is performed on desktop and cordova script is excluded. One then forgets to include the cordova script for the mobile version.


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