Transferring data from a child component to a parent using EventEmitter and dynamic components in Angular 6

Question

Transferring data from a child component to a parent using EventEmitter and dynamic components in Angular 6

Hey there, I am currently working on a dynamic form utilizing a dynamic component loader. The parent component structure is as follows:

<div class="item-form-block-content">
    <div class="form-block">
       <ng-template pf-host></ng-template>
    </div>
</div>

Within this structure, there are multiple child components that are placed inside the ng-template. My goal is to pass data from the child components to the parent component by utilizing an EventEmitter.

For instance, let's consider one of the child components:

<input type="text" [(ngModel)]="value" (change)="onValueChange(value)"/>

Here is the corresponding controller code:

export class childComp implements OnInit {
@Output() someVar = new EventEmitter<any>();

onValueChange(val: any) {
    this.someVar.emit(val);
}}

The question now is, how can I successfully pass the someVar variable from the child component to the parent component?

angular typescript frontend

Answer 1

Answer №1

To handle communication between child and parent components in Angular, you can register an event listener on the child component within the parent component's template.

<child (someVar)="doSomething($event)"></child>

Define the method doSomething(value: any) {} in the parent component to process the emitted values.

Technical Implementation

For a more detailed approach based on specific requirements, check out a solution proposed in this GitHub post. This method involves manually setting up event listeners in the parent component:

class ParentComponent implements AfterContentInit {

    @ContentChildren(ChildComponent)  
    List<ChildComponent> children;

    void onSomeValEvent() {
        console.log("Event received!");
    }

    ngAfterContentInit() {
        this.children.forEach((ChildComponent child) {
            child.someVal.listen((_) => onSomeValEvent());
        });
    }

}

Answer 2

To handle communication between child and parent components in Angular, you can register an event listener on the child component within the parent component's template.

<child (someVar)="doSomething($event)"></child>

Define the method doSomething(value: any) {} in the parent component to process the emitted values.

Technical Implementation

For a more detailed approach based on specific requirements, check out a solution proposed in this GitHub post. This method involves manually setting up event listeners in the parent component:

class ParentComponent implements AfterContentInit {

    @ContentChildren(ChildComponent)  
    List<ChildComponent> children;

    void onSomeValEvent() {
        console.log("Event received!");
    }

    ngAfterContentInit() {
        this.children.forEach((ChildComponent child) {
            child.someVal.listen((_) => onSomeValEvent());
        });
    }

}

Transferring data from a child component to a parent using EventEmitter and dynamic components in Angular 6

Answer №1

Technical Implementation

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