Updating classes dynamically in Angular 2+ to trigger change detection and ensure a seamless user experience

Essentially, I am attempting to initiate a change detection loop by using renderer.removeStyle and renderer.addStyle. The style being added is a CSS animation. However, when the style is removed and re-added within the same change detection loop, Angular fails to detect the change (for the same animation name).

Additional Information

Suppose I have a button event

(click)="addAnimation('animation1')"
that should add an existing animation and introduce a new animation named animation1, animation2 .... Naturally, the following code will not suffice:

  addAnimation(animationName: string): void {
    this.renderer.removeStyle(this.animate.nativeElement, 'animation');
    // setTimeout(() => {
      this.renderer.setStyle(this.animate.nativeElement, 'animation', animationName)
    // }, 0);
  }

as simply removing and adding a style under Angular's radar will not trigger any changes.

One workaround would be to include a timeout (similar to the commented code above), but this method presents unwanted side effects and appears somewhat convoluted.

I had hoped to resolve this issue by inserting something like this.appRef.tick(); in between to compel Angular to initiate another change detection loop.

Unfortunately, this approach does not work. What am I overlooking? Do you have any suggestions on how to tackle this correctly? Thank you!

Answer №1

Here is a different approach to tackle this issue.

clicked = false;
onMouseClick(){
    clicked = true;
}

<div [ngClass]="{'newCSSClass': clicked}">

Answer №2

One effective approach could involve utilizing the CSS animation lifecycle events like animationend, which are compatible with Angular versions 5 and above.

Incorporating a function such as checkAnimateChange() can help control the activation of new animations or determine when no additional animations should occur, enabling the creation of dynamic animation sequences using the [ngClass] directive.

<div [ngClass]="{'animate1': animate1Flag, 'animate2':animate2Flag ... }" (animationend)="checkAnimateChange()">

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