When registering the onHardwareBackButton event in Ionic, the back button continues to successfully navigate to the previous page

Question

When registering the onHardwareBackButton event in Ionic, the back button continues to successfully navigate to the previous page

I recently started working with Ionic and encountered an issue with the onHardwareBackButton event. The event is functioning properly and directing me to the register function, but even after going to the register function, it still navigates back to the previous page. I have a Cordova confirm dialog box set up in the hardwarebackbutton event function so that when the user clicks cancel, they can navigate back to the previous page. However, now the popup appears simultaneously with the navigation back. I have tried various solutions like using:

e.preventDefault()

e.stopPropagation()

but unfortunately, neither of them worked for me. I also attempted to use the registerBackButtonAction event, but it doesn't deregister when I leave the page. I have been stuck on this issue for hours. Below is the code snippet I am currently using:

// Registering the event

showAlertPopup = function(){
// Show the popup
}

$scope.$on '$ionicView.enter', (event, view)->
    $ionicPlatform.registerBackButtonAction showalertPopup, 100

// Deregistering the event

$scope.$on '$ionicView.leave', (event, view)->
    $ionicPlatform.offHardwareBackButton showalertPopup

Instead of registerBackButtonAction, I have tried using onHardwareBackButton.

javascript angularjs cordova ionic-framework

Answer 1

Answer №1

To implement this functionality, you can use the registerBackButtonAction method with a priority of 100. The priorities for different back button actions are as follows:
Return to previous view = 100
Close side menu = 150
Dismiss modal = 200
Close action sheet = 300
Dismiss popup = 400
Dismiss loading overlay = 500

By setting the priority to 100, you will be overriding the default "Return to previous view" action. Remember to handle the de-registration when leaving the view:

var backbuttonRegistration = null;

$scope.$on('$ionicView.enter', function(event, viewData) {
    backbuttonRegistration = $ionicPlatform.registerBackButtonAction(function(e) {
            e.preventDefault();
            showalertPopup();
        }, 100);
});

$scope.$on('$ionicView.leave', function(event, viewData) {
    if (backbuttonRegistration)
    {
        backbuttonRegistration();
    }
});

The registerBackButtonAction method returns a function that can deregister the specific backButtonAction.

Your controller function should follow this pattern:

.controller('homeController', function($scope, $ionicPopup, $ionicPlatform) {

    function showalertPopup() {
      var alertPopup = $ionicPopup.alert({
        title: 'Don\'t eat that!',
        template: 'It might taste good'
      });
      alertPopup.then(function(res) {
        console.log('Thank you for not eating my delicious ice cream cone');
      });
    }

    var backbuttonRegistration = null;

    $scope.$on('$ionicView.enter', function(event, viewData) {
        backbuttonRegistration = $ionicPlatform.registerBackButtonAction(function(e) {
                e.preventDefault();
                showalertPopup();
            }, 100);
    });

    $scope.$on('$ionicView.leave', function(event, viewData) {
        if (backbuttonRegistration)
        {
            backbuttonRegistration();
        }
    });

});

Note: You can also set the priority of registerBackButtonAction to the highest value like 1000 for even more control over the back button behavior:

    backbuttonRegistration = $ionicPlatform.registerBackButtonAction(function(e) {
            e.preventDefault();
            showalertPopup();
        }, 1000);

Answer 2

To implement this functionality, you can use the registerBackButtonAction method with a priority of 100. The priorities for different back button actions are as follows:
Return to previous view = 100
Close side menu = 150
Dismiss modal = 200
Close action sheet = 300
Dismiss popup = 400
Dismiss loading overlay = 500

By setting the priority to 100, you will be overriding the default "Return to previous view" action. Remember to handle the de-registration when leaving the view:

var backbuttonRegistration = null;

$scope.$on('$ionicView.enter', function(event, viewData) {
    backbuttonRegistration = $ionicPlatform.registerBackButtonAction(function(e) {
            e.preventDefault();
            showalertPopup();
        }, 100);
});

$scope.$on('$ionicView.leave', function(event, viewData) {
    if (backbuttonRegistration)
    {
        backbuttonRegistration();
    }
});

The registerBackButtonAction method returns a function that can deregister the specific backButtonAction.

Your controller function should follow this pattern:

.controller('homeController', function($scope, $ionicPopup, $ionicPlatform) {

    function showalertPopup() {
      var alertPopup = $ionicPopup.alert({
        title: 'Don\'t eat that!',
        template: 'It might taste good'
      });
      alertPopup.then(function(res) {
        console.log('Thank you for not eating my delicious ice cream cone');
      });
    }

    var backbuttonRegistration = null;

    $scope.$on('$ionicView.enter', function(event, viewData) {
        backbuttonRegistration = $ionicPlatform.registerBackButtonAction(function(e) {
                e.preventDefault();
                showalertPopup();
            }, 100);
    });

    $scope.$on('$ionicView.leave', function(event, viewData) {
        if (backbuttonRegistration)
        {
            backbuttonRegistration();
        }
    });

});

Note: You can also set the priority of registerBackButtonAction to the highest value like 1000 for even more control over the back button behavior:

    backbuttonRegistration = $ionicPlatform.registerBackButtonAction(function(e) {
            e.preventDefault();
            showalertPopup();
        }, 1000);

When registering the onHardwareBackButton event in Ionic, the back button continues to successfully navigate to the previous page

Answer №1

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