Pass data between different parts of the system

Utilizing the angular material paginator has been a great experience for me. You can check it out here: https://material.angular.io/components/paginator/examples. The paginator triggers an event which allows me to print the page size and page index. This function is implemented in what I'll refer to as Component A.

 paginate($event: PageEvent) {
    concole.log($event.pageIndex);
    console.log($event.pageSize);  
  }

In Component B, there are two variables named pIndex and pSize.

My objective is to assign these variables with values extracted from the PageEvent. However, the pageEvent occurs in Component A.

I attempted to include an event emitter in component A to broadcast the page size.

export class ComponentA {

    @Output() pageSizeEmitter = new EventEmitter<number>();

    paginate($event: PageEvent) {
      this.pageSizeEmitter.emit($event.pageSize);
      concole.log($event.pageIndex);
      console.log($event.pageSize);
    }
}

Nevertheless, in Component B, I face uncertainty on how to link it to the pSize variable.

export class ComponentB {

    pIndex: number = 0; 
    pSize: number = ?

}

Your suggestions and advice on this matter would be highly valued.

Answer №1

If you're looking to achieve this, there are multiple methods available. At your current code stage, one straightforward way is demonstrated in the Stackblitz demo:

<component-b #compB></component-b>

<component-a (pageSizeEmitter)="compB.pSize = $event"></component-a>

This approach relies on template reference variables (compB as shown above).

You can enhance the code by invoking a function and passing compB and $event as arguments, handling the rest within the TypeScript code.

However, please note that using an *ngIf on <component-b> could disrupt this solution. In such cases, it's recommended to rely more on TypeScript:

@ViewChild('compB') _compB: ComponentBComponent;

_setPageSize(pageSize: number) {this._compB.pSize = pageSize;}
<component-b #compB></component-b>

<component-a (pageSizeEmitter)="_setPageSize($event)"></component-a>

In a production environment, utilizing services or a comprehensive state management tool like ngrx would be preferable for handling such scenarios.

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