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API

    
      interface OnChanges {}

A callback method that is invoked immediately after the default change detector has checked data-bound properties if at least one has changed, and before the view and content children are checked.

@paramchanges{ [propName: string]: SimpleChange<any>; }

The changed properties.

@returnsvoid

The following snippet shows how a component can implement this interface to define an on-changes handler for an input property. While you should prefer computed and effect when working with signal-based inputs, the ngOnChanges method does include value changes for signal-based inputs.

@Component({ ... })
export class UserProfile implements OnChanges {
  userId = input<number>(0);
  ngOnChanges(changes: SimpleChanges<UserProfile>) {
    // changes.userId contains the old and new value.
  }
}

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