Is Angulars detectChanges() and markForCheck() relevant for the default change detection strategy?

Question

I found in some code of my colleagues detectChanges() and markForCheck(). They are using the default change detection strategy and no NgZones. As far as I know detectChanges and markForCheck is only necessary if you use OnPush strategy or NgZones.

As far as I know these are the use cases for the methods: detectChanges => if you are using runOutsideAngular for example () or somethink like getElementById() and manipulate and element (which should be avoided in angular)

markForCheck => if an object was mutating + OnPush strategy

So is Angulars detectChanges() and markForCheck() relevant for the default change detection strategy?

user13258211 · Accepted Answer · 2021-01-29 10:57:36Z

2

Yesn't.

If you're not using ChangeDetectionStrategy.OnPush or ChangeDetectorRef, then both of the methods won't do anything.

You can however, detach the change detector, even with default change detection. in that case you can use detectChanges() to manually check the view.

3 Comments

Isaac Tack Over a year ago

they are also not detaching the change detector. They just use the default change detection strategy together with MarkForCheck or detectChanges. But I don't understand the purpose. They also don't use NgZones or any JQuery. Maybe the markForCheck() calls are necessary

user13258211 Over a year ago

@IsaacTack If there are no additional shenanagans, most likely they do nothing. I'd suggest simply asking your colleagues why they used it in the first place.

Isaac Tack Over a year ago

I think they also not so sure about that :-)

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