How can you best utilize changeDetection.markForCheck() in Angular to optimize performance?

During my work with an angular component that uses

changeDetection: ChangeDetectionStrategy.OnPush
, I found myself utilizing the markForCheck method. Initially, I placed it at the beginning of the function and saw positive results. However, upon reflection, I realized that it might be more effective to place it after all the function's actions are completed.

Interestingly, Angular was able to detect changes in both scenarios - whether the markForCheck was called initially or after the actions were executed.

Now, I am curious about finding the optimal way to use markForCheck efficiently. Can someone provide insight into the best practice for utilizing markForCheck?

functionName() { // It works at both places
  this.cd.markForCheck();
  //
  .... Some Code that needs markForCheck ....
  //
  this.cd.markForCheck();
}

Answer №1

It is important to remember to use this.cdr.markForCheck() after making changes to data in a component with the property changeDetection set to ChangeDetectionStrategy.OnPush.

In this scenario, if a parent component has OnPush and some subchild components also have OnPush, calling "markForCheck()" on the parent will trigger a redraw of those subchild components as well.

In my specific situation, compA contains a mat-table in its HTML template, so after updating items I make sure to call markForCheck() to redraw the mat-table.

Answer №2

To signal changes that occurred outside of the currently active change detection strategy, you can utilize the markForCheck() method in Angular.

If you are operating under the default change detection strategy, it is not essential to use markForCheck(), which could explain why the placement of this method call did not initially impact your application.

It is important to remember that markForCheck() should be invoked within a component featuring ChangeDetectionStrategy.OnPush after implementing alterations that may not trigger the OnPush change detection mechanism.

For a more comprehensive understanding, you may want to refer to this detailed explanation: Exploring the variance between markForCheck() and detectChanges()

CORRECTION: My apologies for previously stating that markForCheck() initiates the change detection process - this information was inaccurate. Credit to @Fatih Ersoy for pointing out this error.

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