Ensuring Consistency of Values Between Child and Parent Components

Is there a way to ensure that the value of submitted in the child component always matches the value of submitted in the parent component? Appreciate any help!

@Component({
    selector: 'child-cmp',
    template: `
        child:{{submitted}} 
  `
})
class ChildCmp {
    @Input('submitted') submitted: boolean;

    ngOnInit() {
      this.submitted = true;
    }
}

@Component({
    selector: 'app',
    template: `
    <child-cmp [submitted]="submitted"></child-cmp>
    parent:{{submitted}} 
  `,
    directives: [ChildCmp]
})
class App {
    submitted: boolean;
}
bootstrap(App);

Answer №1

Establish bi-directional model binding:

<child-component [(completed)]="completed"></child-component>

Child Component:

@Component({
    selector: 'child-component',
    template: `
        {{completed}} <button (click)="onComplete()">Complete</button>
  `
})
class ChildComponent {
    @Input('completed') completed: boolean;
    @Output('completedChange') completedChange: EventEmitter<boolean> = new EventEmitter();

    onComplete() {
        this.completed = true;
        this.completedChange.emit(this.completed);
    }
}

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