角度2（单击）在组件标签上

Question

I have two angular components. The first component is a list with the tag <my-list-comp></my-list-comp> . My second component is a button with the tag <my-button-comp></my-button-comp> . In the template of my list component I'm using the button component with it's tag like this:

template my-list-comp.html :

<div class="list>
    <ul><!-- some stuff --></ul>
    <my-button-comp></my-button-comp>
</div>

template my-button-comp.html :

<button routerLink="/goToOtherComponent">Click me!</button>

Now my question: Is it possible to use the (click) on the tag <my-button-comp></my-button-comp> to call a function from the controller in my-list-comp like this:

template my-list-comp.html :

<div class="list>
    <ul><!-- some stuff --></ul>
    <my-button-comp (click)="myFunction()"></my-button-comp>
</div>

controller my-list.comp.ts :

myFunction() {
    console.log('hello world');
}

I've tried it like above, but it didn't work? Is this possible? Didn't find anything about this topic.

Answer 1

You would need to use an EventEmitter and the Output decorator like so:

my-button-comp.ts

import { EventEmitter } from '@angular/core';
@Output() onBtnClick = new EventEmitter<undefined>();

my-button-comp.html

<button (click)="onBtnClick.emit()">Click me!</button>

my-list-comp.html

<div class="list>
    <ul><!-- some stuff --></ul>
    <my-button-comp (onBtnClick)="myFunction()"></my-button-comp>
</div>

Answer 2

With angular components, the (something) syntax refers to events from a child to a parent component (see here for the official docs) so what you are doing is invalid.

If you want to trigger something from a child to a parent, the correct way of doing it is to send an event from the child and have the proper listener in place in the parent component.