In my scenario, the value for a watched variable can be set in the current stack or loaded asynchronously (it is encapsulated code). Because of this, I cannot guarantee that the value was changed when the watch handler is called.
Although I have reviewed and understood this API description, I am still unsure how to resolve the issue in my code.
PS: I attempted to call $scope.$digest(), but it was already in progress with $apply.
To activate the $watch function, it is necessary to modify the content of the "Input" field. You can see a functional example in this
Snippet of code:
<input type="text" ng-model="input" />
Your watch function is triggered every time $scope.$digest gets called, which usually happens through the $apply function. The $digest cycle is initiated by various events like browser interactions (clicks, keydown), completion of $http requests, and also by $timeouts.
Consider using the $timeout service instead of the setTimeout method in this case:
$timeout(function() {
deferred.resolve('test value');
}, 0);
You can check out this example on jsfiddle to see how $scope.$apply is fired after the timeout is completed.
When async = false, the value is set immediately when the controller is loaded or when the $scope is created. This results in no change in the $scope.text during the first $digest cycle, leading to newVal being equal to oldvalue.
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