Is it possible to detect the source of a digest cycle in AngularJS?

I've found myself knee-deep in a legacy AngularJS project lately. The codebase is quite intricate and expansive, making it difficult to showcase here. However, I've come across an issue where functions triggered during digest changes are firing hundreds of times per second indefinitely, even when the page remains dormant. This realization dawned on me as I monitored the console logs closely. For instance, if I integrate a function such as:

$rootScope.$watch(function (e) {
   console.log('digest changed' );
});

and observe the console log output, 'digest changed' will flood the screen relentlessly. It's evident that this perpetual triggering of the digest cycle isn't ideal. Is there a method for pinpointing the root cause of this tumultuous cycle? I'd appreciate any guidance you can offer!

javascriptangularjsangularjs-scope

Answer №1

Although I couldn't find the answer to my question right away, I managed to resolve the issue by using a brute-force approach of systematically removing elements until the problem was resolved. Through this method, I identified that a library named infinite-scroll was the root cause of the problem.

Answer №2

Dirty checking is activated by a variety of triggers:

  1. Manually calling $digest() or $apply() on a specific $scope or $rootScope
  2. Using Angular's built-in methods like $timeout or $https (which actually utilize #1 internally)
  3. Third-party libraries that build upon #1 and #2
  4. User-triggered events such as clicks or keypresses

In most cases, I would start with #1 and consider setting breakpoints (or using logpoints) at every instance of $digest()/$apply() in your code.

If this approach doesn't yield results, I would recommend placing a logpoint directly within Angular's digest() function - this can help identify issues like infinite call queues similar to those you are experiencing.

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