When I run cdr.detectChanges() in a nested child component (Child1) which has a parent and another nested child component (Child2), only ngDoCheck is invoked in Child2. Why doesn't it invoke DoCheck in the current component (Child1) as well? How can I determine if the current component is also being checked?
To illustrate, here is a small example: https://github.com/michalgrzegorczyk-dev/change-detection
Components involved: app-child1, app-child2
This article delves into the reasons behind this phenomenon:
Once change detection is activated for a specific view/component, it goes through a series of operations in a set order:
... 6. initiates OnInit and ngDoCheck on a child component (OnInit only triggers during the initial check)
So when you call child1.detectChanges(), Angular will execute the ngDoCheck hook on the child component, which is referred to as child2. This design allows manual control over the OnPush logic from within the ngDoCheck hook. If child2 is configured with OnPush and there are no changes in input bindings, you can still use changeDetectorRef.markForCheck() within the ngDoCheck of child2 to mark the component as needing updates. In essence, ngDoCheck signals that Angular is preparing to run a check on the child component, where part of the process involves updating input properties on child components and refreshing view bindings on the current component.
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