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[英]How do I update state object when an event is emitted from an outside component using ngrx with Angular 6?
[英]In Angular 7, how do I access the component that emitted an event?
假設我有一個帶有自定義事件的組件:
child.component.html
<button (click)="buttonClicked()">Test</button>
child.component.ts
@Component({
selector: 'my-child',
templateUrl: './child.component.html'
})
export class ChildComponent {
@Output() myEvent = new EventEmitter();
public buttonClicked() {
this.myEvent.emit();
}
}
然后,我有另一個組件,其中包含第一個組件的多個實例。
parent.component.html
<my-child id="my-child-component-1" (myEvent)="myEventOccured()" />
<my-child id="my-child-component-2" (myEvent)="myEventOccured()" />
parent.component.ts
@Component({
selector: 'my-parent',
templateUrl: './parent.component.html'
})
export class ParentComponent {
public myEventOccured() {
//HERE I WANT I REFERENCE TO THE COMPONENT EMITTING THE EVENT.
}
}
在處理子組件的自定義事件的函數(myEventOccured())中,我要訪問發出該事件的組件。 我怎么做?
我在想也許應該將發射組件作為參數發送給處理事件的函數(myEventOccured()),但我不知道如何。
您可以在發出時傳遞值,並使用$event
將其收集回父$event
@Component({
selector: 'my-child',
templateUrl: './child.component.html'
})
export class ChildComponent {
@Output() myEvent = new EventEmitter<ChildComponent>(); // for better type checking
public buttonClicked() {
this.myEvent.emit(this); // emit reference to this component
}
}
<my-child id="my-child-component-1" myEvent="myEventOccured($event)" />
@Component({
selector: 'my-parent',
templateUrl: './parent.component.html'
})
export class ParentComponent {
public myEventOccured(child: ChildComponent) {
console.log(child);
}
}
但是,我不確定傳遞整個組件是否是一個好習慣。 您可以考慮只釋放父母真正需要的東西。
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