Can you confirm if this code is synchronous in AngularJS?
scope.$apply(function(){
console.log('foo');
});
Can you confirm if this code is synchronous in AngularJS?
scope.$apply(function(){
console.log('foo');
});
Absolutely.
The $apply() function operates synchronously, causing the browser to block user input while JavaScript is executed on the main thread. In the case of rapid input events by the user, the browser ensures that these events are queued accordingly.
For more information, visit: https://example.com/angular-issues/1234
Absolutely, the $apply() function in AngularJS is synchronous.
However, for an asynchronous alternative, you can opt for
$applyAsync()
With
$applyAsync(), you can schedule the execution of $apply to a deferred time. The specific time frame may vary across different browsers, but it is typically around ~10 milliseconds.This feature is beneficial for queuing up numerous expressions that require evaluation in the same digest cycle.
For further information, please refer to this discussion thread.
$apply utilizes $eval method.
$eval operates synchronously.
Therefore, $apply is indeed synchronous.
If asynchronous behavior is needed, there is a $evalAsync method available.
Based on the availability of the $scope.$applyAsync() function, my conclusion is that this function operates synchronously.
Affirmative, indeed it is:
Behold, the angular source code is as follows:
$apply: function(expr) {
try {
commencePhase('$apply');
try {
return this.$eval(expr);
} finally {
eliminatePhase();
}
} catch (e) {
$exceptionHandler(e);
} finally {
try {
$rootScope.$digest();
} catch (e) {
$exceptionHandler(e);
throw e;
}
}
Furthermore, the function commencePhase:
function commencePhase(phase) {
if ($rootScope.$$phase) {
throw $rootScopeMinErr('inprog', '{0} already in progress', $rootScope.$$phase);
}
$rootScope.$$phase = phase;
}
Be alert as it may throw an exception if a $apply or $digest is currently in progress.
The applyAsync merely adds expressions to an array to be executed in the subsequent $digest cycle.
If your intention is solely to ensure no $digest is in progress, follow these steps:
$timeout(
scope.$apply(function(){
console.log('foo');
});
);
This will run after the $digest cycle
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