Is it possible to access the scope when the Angular-UI-Router is exited?

Question

Is it possible to access the scope when the Angular-UI-Router is exited?

I'm searching for a potential solution:

$stateProvider.state('user', angularAMD.route({
        url: '/user/:id',
        templateUrl: 'views/user.html',
        controllerUrl: 'views/user',
        controller: 'UserCtrl',
        onExit: function () {
            alert ("leaving user");
           // trigger scope function saveCurrentStateData();

        }
    }));

saveCurrentStateData() allows me to save some scope data (such as $scope.my.data) using a REST-Service defined at the backend.

EDIT: Is there an alternative to using $scope.$on ('destroy',..? Perhaps utilizing the resolve property of ui-router? Why am I unable to use onExit, and why is it included here?

angularjs angular-ui-router state exit enter

Answer 1

Answer №1

You can monitor the $destroy $scope event within your controller to perform necessary cleanup tasks.

var UserCtrl = function ($scope) {
    $scope.$on('$destroy', function() {
        // Add code here for cleanup or call a separate function
    });
};

If you're curious about when the controller gets initialized and destroyed in the context of ui-router, you can refer to this Stack Overflow question.

EDIT 1: To access your $state parameters, you can listen for the $stateChangeStart or $stateChangeSuccess events and retrieve the desired parameter like this:

$rootScope.$on('$stateChangeStart', function(event, toState, toParams, fromState,fromParams) {
            if(fromState.name == 'yourstate'){
                // Access the parameter here
                console.log(fromParams.stateid);
            }
        });

EDIT 2: The reason why you cannot use onExit is because it's called after the state has already changed. However, in the upcoming major version (1.0), there will be an injectable service named $transition$ that allows you to access the state parameters. You can find more information about this enhancement here.

Answer 2

You can monitor the $destroy $scope event within your controller to perform necessary cleanup tasks.

var UserCtrl = function ($scope) {
    $scope.$on('$destroy', function() {
        // Add code here for cleanup or call a separate function
    });
};

If you're curious about when the controller gets initialized and destroyed in the context of ui-router, you can refer to this Stack Overflow question.

EDIT 1: To access your $state parameters, you can listen for the $stateChangeStart or $stateChangeSuccess events and retrieve the desired parameter like this:

$rootScope.$on('$stateChangeStart', function(event, toState, toParams, fromState,fromParams) {
            if(fromState.name == 'yourstate'){
                // Access the parameter here
                console.log(fromParams.stateid);
            }
        });

EDIT 2: The reason why you cannot use onExit is because it's called after the state has already changed. However, in the upcoming major version (1.0), there will be an injectable service named $transition$ that allows you to access the state parameters. You can find more information about this enhancement here.

Answer 3

Answer №2

One way to ensure proper cleanup of your controller is by utilizing the $destroy event in the controller lifecycle.

// Add this code to your controller
$scope.$on('$destroy', function onControllerDestroy() {
  // Perform any necessary actions before the controller is destroyed
  $scope.saveCurrentStateData();
})

If you want to learn more about the lifecycle of an AngularJS Controller, check out this post: Understanding the Lifecycle of an AngularJS Controller

Answer 4

One way to ensure proper cleanup of your controller is by utilizing the $destroy event in the controller lifecycle.

// Add this code to your controller
$scope.$on('$destroy', function onControllerDestroy() {
  // Perform any necessary actions before the controller is destroyed
  $scope.saveCurrentStateData();
})

If you want to learn more about the lifecycle of an AngularJS Controller, check out this post: Understanding the Lifecycle of an AngularJS Controller

Answer 5

Answer №3

Hey, did you know that you can leverage the power of ui-router by using this specific event?

$scope.$on('$stateChangeStart', stateChangeStart(event, toState, toParams, fromState) {
// Feel free to write your custom code here;
});

If you prefer, you can also utilize another useful event like this:

$scope.$on('$stateChangeSuccess', stateChangeSuccess(event, toState, toParams, fromState) {
// Don't forget to insert your own code in this block as well;
});

I wish you all the best!

Answer 6

Hey, did you know that you can leverage the power of ui-router by using this specific event?

$scope.$on('$stateChangeStart', stateChangeStart(event, toState, toParams, fromState) {
// Feel free to write your custom code here;
});

If you prefer, you can also utilize another useful event like this:

$scope.$on('$stateChangeSuccess', stateChangeSuccess(event, toState, toParams, fromState) {
// Don't forget to insert your own code in this block as well;
});

I wish you all the best!

Answer 7

Answer №4

It seems like you might not be interested in the reason anymore since there is already an accepted answer. However, I encountered a similar issue recently and stumbled upon this question. In my opinion, none of the previous answers addressed the exact problem, so allow me to provide my own explanation. Without the full code provided in your question, I can only speculate that the exit event did not occur at all.

According to this article, when a state is active, all its ancestor states are implicitly active as well, but the exit event does not occur if you navigate to a descendant state. This behavior might explain why you're not seeing the expected results.

I created a plnkr example to demonstrate this concept more clearly. Hopefully, it will help clarify any confusion.

<!DOCTYPE html>
<html ng-app="demo">
  <head>
    <meta charset="utf-8" />
    <title>Demo</title>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.6/angular.min.js"></script>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/1.0.3/angular-ui-router.min.js"></script>
    <script>
      let app = angular.module('demo', ['ui.router']);
    
      app.config(['$urlRouterProvider', '$stateProvider', function ($up, $sp) {
        $sp.state(state1);
        $sp.state('state1.state2', state2);
        $sp.state('state1.state3',state3);
        $up.otherwise('/');
      }]);
      
      let state1 = {
        name: 'state1',
        url: '/',
        controller: function () {},
        template: `<p>I am state1</p>
        <div ui-view="state2view">
          <a ui-sref="state1.state2"> Jump to state1.state2</a>
        </div>
        <div ui-view="state3view">
          <a ui-sref="state1.state3"> Jump to state1.state3</a>
        </div>`,
        onExit: function(){alert('Goodbye state1')}
      };
      
      let state2 = {
        name: 'state1.state2',
        views: {
          state2view: {
            controller: function () {},
            template: 'I am state1.state2'
          }
        },
        onExit: function(){alert('Goodbye state1.state2')}
      };
      
      let state3 = {
        name: 'state1.state3',
        views: {
          state3view: {
            controller: function () {},
            template: 'I am state1.state3'
          }
        },
        onExit: function(){alert('Goodbye state1.state3')}
      };
    </script>
  </head>

  <body>
    <ui-view></ui-view>
  </body>
</html>

Answer 8

It seems like you might not be interested in the reason anymore since there is already an accepted answer. However, I encountered a similar issue recently and stumbled upon this question. In my opinion, none of the previous answers addressed the exact problem, so allow me to provide my own explanation. Without the full code provided in your question, I can only speculate that the exit event did not occur at all.

According to this article, when a state is active, all its ancestor states are implicitly active as well, but the exit event does not occur if you navigate to a descendant state. This behavior might explain why you're not seeing the expected results.

I created a plnkr example to demonstrate this concept more clearly. Hopefully, it will help clarify any confusion.

<!DOCTYPE html>
<html ng-app="demo">
  <head>
    <meta charset="utf-8" />
    <title>Demo</title>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.6/angular.min.js"></script>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/1.0.3/angular-ui-router.min.js"></script>
    <script>
      let app = angular.module('demo', ['ui.router']);
    
      app.config(['$urlRouterProvider', '$stateProvider', function ($up, $sp) {
        $sp.state(state1);
        $sp.state('state1.state2', state2);
        $sp.state('state1.state3',state3);
        $up.otherwise('/');
      }]);
      
      let state1 = {
        name: 'state1',
        url: '/',
        controller: function () {},
        template: `<p>I am state1</p>
        <div ui-view="state2view">
          <a ui-sref="state1.state2"> Jump to state1.state2</a>
        </div>
        <div ui-view="state3view">
          <a ui-sref="state1.state3"> Jump to state1.state3</a>
        </div>`,
        onExit: function(){alert('Goodbye state1')}
      };
      
      let state2 = {
        name: 'state1.state2',
        views: {
          state2view: {
            controller: function () {},
            template: 'I am state1.state2'
          }
        },
        onExit: function(){alert('Goodbye state1.state2')}
      };
      
      let state3 = {
        name: 'state1.state3',
        views: {
          state3view: {
            controller: function () {},
            template: 'I am state1.state3'
          }
        },
        onExit: function(){alert('Goodbye state1.state3')}
      };
    </script>
  </head>

  <body>
    <ui-view></ui-view>
  </body>
</html>

Is it possible to access the scope when the Angular-UI-Router is exited?

Answer №1

Answer №2

Answer №3

Answer №4

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