In my child component, I have a variable containing the array result of a Barcode Scanner that I need to pass to the parent page. This array needs to be sent to an API.
childComponent.ts
this.consultList;
parentComponent.ts
export class ParentComponent implements OnInit {
@Input() consultList: any[] = [];
testCall() {
console.log('Test Consult: ', this.consultList;
}
Check out this stackblitz sample project for experimenting with parent-child data communication, utilizing the @Input() and @Output() functionalities
import { Component, EventEmitter, Input, Output } from '@angular/core';
@Component({
selector: 'child',
template: `
<h1>Greetings {{ name }}! This is the child component</h1>
<button (click)="sendEventToParent()">Send information to parent</button>
`,
styles: [
`
h1 {
font-family: Lato;
}
`
]
})
export class ChildComponent {
@Input() name: string;
@Output() eventFromChild: EventEmitter<string> = new EventEmitter();
sendEventToParent(): void {
this.eventFromChild.emit('data from child');
}
}
This section presents the parent component HTML named child
<child name="{{ name }}" (eventFromChild)="onEvent($event)"></child>
<h1>This is the parent component</h1>
<p>{{dataFromChild}}</p>
The event binding code snippet appears as follows
import { Component, VERSION } from '@angular/core';
@Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
name = 'Angular ' + VERSION.major;
dataFromChild = '';
onEvent(event): void {
this.dataFromChild = event;
}
}
An abstract class is what you may be referring to. This type of class can have abstract properties and methods similar to an interface, but it is different in that it can implement methods as well. While you cannot instantiate an abstract class, you can inherit its code for reuse.
https://codesandbox.io/s/patient-breeze-h4s3t?file=/src/index.ts
abstract class Parent {
abstract someProperty: string;
someCall() {
console.log(this.someProperty);
}
}
class ChildOne extends Parent {
someProperty = "I am child one";
}
class ChildTwo extends Parent {
someProperty = "I am child two";
}
const one = new ChildOne();
const two = new ChildTwo();
one.someCall(); // "I am child one";
two.someCall(); // "I am child two";
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