Taking advantage of Input decorator to access several properties in Angular 2

I am currently working on a component that is designed to receive two inputs through its selector. However, I would like to make it flexible enough to accept any number of inputs from various components. Initially, I tried using a single @Input() decorator to consume multiple properties in the component itself, but found that this approach was limiting. As a workaround, I ended up using two decorators for two input properties. While this solution works, I am wondering if there is a more efficient way to handle this scenario.

export class AsyncComponent {
     @Input() waitFor: boolean;
     @Input() message: string; // TODO: Verify if multiple inputs are needed for multiple props
 }

Update

<app-async [waitFor]="true" message="foo"><app-async>

Is there an alternative method that would allow me to use just one decorator to handle any number of input properties? If I need to pass additional properties other than waitFor and message, would I be required to create separate decorators for each?

 @Input() waitFor: boolean;
 @Input() message: string;
 @Input() someOtherProp: string;
 ....

Alternatively, is there a more streamlined approach that would enable me to utilize a single Input decorator to consume any number of properties?

Answer №1

I concur with Roman C.

My suggestion would be to pass a single object instead of an array containing all the props:

@Component({
  selector: 'app-async'
})
export class AsyncComponent {
  // Use a single object for props.
  @Input() props: { waitFor: boolean; message: string; };
}

Then, in the parent component:

@Component({
  template: '<app-async [props]="myProps"><app-async>'
})
export class ParentComponent {
  myProps = { waitFor: true, message: 'foo' };
}

Please note that interfaces specified on input properties are not strictly enforced. It is recommended to declare them nonetheless; however, JavaScript cannot check TypeScript interfaces at runtime. This advice applies to all code examples in this discussion (whether it's a single input or multiple inputs).

Answer №2

If you require multiple values, utilizing an array or similar structure is the recommended approach

export class AsyncComponent {
     @Input() props: any[];

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