Cordova backbutton preventDefault is not working - angularjs

Question

I have application which is done using ionicframework and cordova. In my app i have requirement that if user pressed back button then i need to ignore it. But only after user pressed it third time it should close app.
Previously project was done using phonegap and jquery and same code works. I did small workaround when i am throwing an exception then it app was not closed when it should not.
document.addEventListener("backbutton", function (e) {
if (new Date() - firstDateClick > 1000) {
firstDateClick = new Date();
totalClicks = 1;
} else {
totalClicks++;
if (totalClicks >= 3) {
var answer = confirm('Are You Sure You Want Exit');
if (answer) {
var service = angular.injector(['ng', 'starter.services']).get('DanceService');
service.logEvent("exit")
.then(function () {
alert('exit1')
if (navigator.app) {
navigator.app.exitApp();
}
else if (navigator.device) {
navigator.device.exitApp();
}
})
} else {
totalClicks = 1;
}
}
}
throw "ignore"
});
But i dont like idea to throw exception.

Answer 1

i made two times control before log out from the app. So the user can press one time and a toast will appear with the text "press again to exit" and the second press -> log out.
This is my service:
var deregisterFunction = null;
return {
disableBack: disableBack,
registerAction: registerAction,
goHome: goHome,
goBack: goBack,
deregisterAction: deregisterAction,
closeApp: closeApp
};
function disableBack() {
deregisterFunction = angular.copy($ionicPlatform.registerBackButtonAction(null, 101));
}
function registerAction(cb, priority) {
deregisterFunction = angular.copy($ionicPlatform.registerBackButtonAction(cb, priority));
}
function deregisterAction() {
if (deregisterFunction) {
deregisterFunction();
}
goBack();//default behaviour
}
function goHome() {
deregisterFunction = angular.copy($ionicPlatform.registerBackButtonAction(function() {
$state.go('app.home');
}, 101));
}
function goBack() {
deregisterFunction = angular.copy($ionicPlatform.registerBackButtonAction(function() {
$ionicHistory.goBack();
}, 101));
}
function closeApp() {
deregisterFunction = angular.copy($ionicPlatform.registerBackButtonAction(function() {
ionic.Platform.exitApp();
}, 101));
}
And this my utils service:
var service = {
logoutToast: logoutToast,
resetToastCount: resetToastCount
};
var toastCount = 0;
return service;
function resetToastCount() {
toastCount = 0;
}
function logoutToast() {
switch (toastCount) {
case 0:
$cordovaToast.show('Press again to log out', 'short', 'bottom');
toastCount++;
break;
case 1:
toastCount = 0;
//logout
break;
default:
$cordovaToast.show('Error', 'short', 'bottom');
}
}
}
}());
So in my controller i have this for register the action of my service:
$scope.$on('$ionicView.afterEnter', backButtonService.registerAction(utils.logoutToast, 101));
This for reset the count where i want:
$scope.$on('$ionicView.afterEnter', utils.resetToastCount());
And this for deregister my action when i navigate:
$scope.$on('$stateChangeStart', backButtonService.deregisterAction);
Hope this will helps you :)

Answer 2

Disable back button on Ionic/Cordova
$ionicPlatform.registerBackButtonAction(null, 101);