CODEWITHSUNDEEP
angularjsscopedestroy
Daniel Darabos
Daniel Darabos

Reputation: 27455

How to tell if scope has been destroyed

I'm putting stuff into a queue and processing them one by one. The stuff may belong to an AngularJS scope. If the scope it belongs to has been already destroyed by the time I get to it, I want to skip processing it. (The user has navigated away from the UI that would display the result, so there is no point computing it.)

One option is this:

function enqueue(stuff, scope) {
  queue.push(stuff);
  scope.$on('$destroy', function() {
    queue.discard(stuff);
  });
}

But I feel like this is somewhat heavy-weight. It adds an event handler for each "stuff". (I would also need to remove this event handler when I dequeue the item.) I feel it would be better to check if the scope has been destroyed at the time when I dequeue an item.

function process(stuff, scope) {
  if (scope.$destroyed) { // Fictional API.
    return; // Skip processing, scope is already gone.
  } else {
    ... // Actually process "stuff".
  }
}

scope.$destroyed is made up, but I'm looking for something similar. Thanks!

Upvotes: 2

Views: 2261

Answers (1)

Akhilesh Bhatia
Akhilesh Bhatia

Reputation: 132

You can use $scope.$$destroyed flag to check if the scope is destroyed.

Upvotes: 2

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