Retrieve the variable declared within the event

How can I access a variable set in an event?

Here is the code snippet:

$scope.$on('event_detail', function (event, args) {
        $scope.id = args;
        console.log($scope.id); // This prints the correct value
});
console.log($scope.id); // This returns undefined

When trying to display "$scope.id" in the console, it shows "undefined". Is there a way to access the variable outside of the $scope.$on function?

This is my broadcast function:

$scope.showDetail = function (data) {
        $rootScope.$broadcast("event_detail", data.id_case);
        $location.path("/detailcase/" + data.id_case);
    };

Answer №1

The issue lies in the fact that $scope.$on is asynchronous, meaning that when you try to access $scope.id outside of the event function, it may not have been set yet.

Therefore, it's important to perform any necessary actions inside the $on function, as this ensures that $scope.id has been properly initialized before use;

Answer №2

It seems that the issue arises from defining a delegate without any call being made yet.

$scope.$on('event_detail', function (event, args) {
        $scope.id = args;

        // This code will only work once $scope.id is populated
        console.log($scope.id); 

});

//$scope.id is not populated at this point
// It will be populated when the broadcast is called
console.log($scope.id); 

If your code resembles the following structure, then it should function correctly...

$scope.$on('event_detail', function (event, args) {
        $scope.id = args;
        console.log($scope.id); // This code works

});

$rootScope.$broadcast("event_detail", data.id_case); // Trigger the broadcast

console.log($scope.id); // It will no longer be undefined

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