CODEWITHSUNDEEP
angular
celsomtrindade
celsomtrindade

Reputation: 4671

Angular 4 execute function from another component

I'm build a webapp using Angular4 and I'm trying to create a button to call functions on other components.

I was reading other similar questions here, but they have a scenario where the components are child or sibling components with the declaration on the html, e.g.:

<parent-component>
    <child-component></child-component>
    <sibling-component></sibling-component>
</parent-component>

However, I'm working on a different scenario, because my components are Invoked via routing and I can't make it work.

Basically I have a header on the page with some controls to execute functions, but these functions need to trigger/change data on other components loaded via the routing.

For example, I have the routing /store to show a list of stores, I also have a drawer on this page that I want to show when the user clicks on a button on the header, this is the problem, because I can't propagate the event from the HeaderComponent to the StoreComponent.

These are my files:

header.component.ts

@Component({
    selector: 'header',
    templateUrl: `
        <section class="container">
            <button (click)="clickFilter()">Open filter</button>
        </section>
    `
})

export class HeaderComponent {
    @Output() onFilter: EventEmitter = new EventEmitter();

    clickFilter():void {
        this.onFilter.emit('Register click');
    }
}

store.component.ts

@Component({
    templateUrl: 'store.html'
})

export class StoreComponent {
    onFilterClick(event) {
        console.log('Fire onFilterClick: ', event);
    }
}

// store.html
<article class="card" (onFilter)="onFilterClick($event)">
    Test
</article>

But this is not working.

Also, I don't actually need to call a function, I could just pass a boolean value, for example, to bind to a property on the StoreComponent and then toggle the div inside the html file.

Upvotes: 26

Views: 88881

Answers (2)

user3502488
user3502488

Reputation: 61

I had a similiar situation, but didn´t want to make a service for this. I managed to pass it like callback. It would be something like this:

header.component.ts

@Component({
selector: 'header',
templateUrl: `
    <section class="container">
        <button (click)="myFunction()">Open filter</button>
    </section>
`})
export class HeaderComponent {
   @Input() myFunction: Function;
}

Then just to call it passing the function and parameter

// store.html
<header [myFunction]="functionOnStore"></header>

And just declaring functionOnStore normally on store component

Upvotes: 4

Piyush Patel
Piyush Patel

Reputation: 1240

I didn't get time to test it but similar solution worked for me. the code created for your need.

Create a service like this

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';

@Injectable()
export class MessageService {
    private _listners = new Subject<any>();

    listen(): Observable<any> {
       return this._listners.asObservable();
    }

    filter(filterBy: string) {
       this._listners.next(filterBy);
    }

}

then implement in your header component like this

// header.component.ts
@Component({
    selector: 'header',
    templateUrl: `
        <section class="container">
            <button (click)="clickFilter()">Open filter</button>
        </section>
    `
 })

export class HeaderComponent {
     @Output() onFilter: EventEmitter = new EventEmitter();

     constructor(private _messageService: MessageService){}
     clickFilter():void {
         // this.onFilter.emit('Register click');
         this._messageService.filter('Register click');
     }
 }

then use in your store component like this

@Component({
    selector: 'store',
    template: `<article class="card">
                 Test
              </article>`
})

export class StoreComponent {
    constructor(private _messageService: MessageService){
        this._messageService.listen().subscribe((m:any) => {
            console.log(m);
            this.onFilterClick(m);
        })
    }

    onFilterClick(event) {
        console.log('Fire onFilterClick: ', event);
    }
 }

The concept is that you can use observable in a service and subscribe in the component where you want it (store.component) and can send event from anywhere in the app like i did in the header.component

I hope it will help you

Upvotes: 45

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