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import {Injectable, EventEmitter} from 'angular2/core'; | |
@Injectable() | |
export class EmitterService { | |
private static _emitters: { [ID: string]: EventEmitter<any> } = {}; | |
static get(ID: string): EventEmitter<any> { | |
if (!this._emitters[ID]) | |
this._emitters[ID] = new EventEmitter(); | |
return this._emitters[ID]; | |
} | |
} |
import {Component, Input, OnChanges} from 'angular2/core'; | |
import {EmitterService} from './emitter.service'; | |
@Component({ selector: 'dispatcher', template: '' }) | |
class DispatcherComponent implements OnChanges { | |
@Input() id: string; | |
private value = "dispatcher component value"; | |
doStuff() { | |
EmitterService.get(this.id).emit(value); | |
} | |
} | |
@Component({ selector: 'listener', template: '' }) | |
class ListenerComponent implements OnChanges { | |
@Input() id: string; | |
ngOnChanges() { | |
EmitterService.get(this.id).subscribe(value => console.log(value)); | |
} | |
} | |
@Component({ | |
providers: [EmitterService], | |
selector: 'host', | |
template: ` | |
<dispatcher [id]="host_id"></dispatcher> | |
<listener [id]="host_id"></listener> | |
` | |
}) | |
export class HostComponent { | |
public host_id: "HOST_COMPONENT"; | |
constructor(private _emitterService: EmitterService) {} | |
} |
Thanks a lot, it helped me create a module level messaging service.
I get the following error but when i console.log('this.id'), this prints the value of host_id in both child components.
error_handler.js:48 EXCEPTION: Cannot read property 'emit' of undefinedErrorHandler.handleError @ error_handler.js:48next @ application_ref.js:298schedulerFn @ async.js:89SafeSubscriber.__tryOrUnsub @ Subscriber.js:223SafeSubscriber.next @ Subscriber.js:172Subscriber._next @ Subscriber.js:125Subscriber.next @ Subscriber.js:89Subject.next @ Subject.js:55EventEmitter.emit @ async.js:81NgZone.triggerError @ ng_zone.js:280onHandleError @ ng_zone.js:259ZoneDelegate.handleError @ zone.js:236Zone.runTask @ zone.js:157ZoneTask.invoke @ zone.js:335
error_handler.js:53 ORIGINAL STACKTRACE:ErrorHandler.handleError @ error_handler.js:53next @ application_ref.js:298schedulerFn @ async.js:89SafeSubscriber.__tryOrUnsub @ Subscriber.js:223SafeSubscriber.next @ Subscriber.js:172Subscriber._next @ Subscriber.js:125Subscriber.next @ Subscriber.js:89Subject.next @ Subject.js:55EventEmitter.emit @ async.js:81NgZone.triggerError @ ng_zone.js:280onHandleError @ ng_zone.js:259ZoneDelegate.handleError @ zone.js:236Zone.runTask @ zone.js:157ZoneTask.invoke @ zone.js:335
error_handler.js:54 TypeError: Cannot read property 'emit' of undefined
at SafeSubscriber._next (grid.component.ts:13)
at SafeSubscriber.__tryOrUnsub (Subscriber.js:223)
at SafeSubscriber.next (Subscriber.js:172)
at Subscriber._next (Subscriber.js:125)
at Subscriber.next (Subscriber.js:89)
at MapSubscriber._next (map.js:83)
at MapSubscriber.Subscriber.next (Subscriber.js:89)
at XMLHttpRequest.onLoad (xhr_backend.js:82)
at ZoneDelegate.invokeTask (zone.js:265)
at Object.onInvokeTask (ng_zone.js:229)ErrorHandler.handleError @ error_handler.js:54next @ application_ref.js:298schedulerFn @ async.js:89SafeSubscriber.__tryOrUnsub @ Subscriber.js:223SafeSubscriber.next @ Subscriber.js:172Subscriber._next @ Subscriber.js:125Subscriber.next @ Subscriber.js:89Subject.next @ Subject.js:55EventEmitter.emit @ async.js:81NgZone.triggerError @ ng_zone.js:280onHandleError @ ng_zone.js:259ZoneDelegate.handleError @ zone.js:236Zone.runTask @ zone.js:157ZoneTask.invoke @ zone.js:335
grid.component.ts:13 Uncaught TypeError: Cannot read property 'emit' of undefined(…)
Thank you for sharing 👍
Helped me to do my task.
thanks
Really helped me out, thank you.
thank you for the code
Thanks for sharing, it helps a lot !
Hello mate, thanks for sharing! I am trying to call a function of a component from a sibling component. Any idea on how to do it? Thanks in advance!
Thanks! really helpful.
Q - those the components must be siblings? As I see the can be totally foreign components that only share the service.
Or I just got it wrong?
nice one .. thanks
EventEmitter is not meant to be used inside a service. They should be used only for emitting custom events inside components. You can use RxJS BehaviorSubject instead!
This very nice example, for communication between cross components.
I am facing below issues. Please help me.
Created one parent component and name is product component. inside product component i have two child component and these child components are siblings.
1, product info and
2, product details.
I am looping these siblings product from parent component.
In side product info component i have one button as a show details. When i click on show detail button needs to display in product detail component.
for acheving this i used event emmiter service.
When i subscribing event emitters service in product details component it's looping
I am facing below issues. Please help me.
Created one parent component and name is book-list component.and another one component is created if i click book-list component book title how to come book-details in book-details page
Geat!! thanks a lot.. this gist help me!