我有一个child-component：
import {Component, EventEmitter, OnInit, Output} from '@angular/core';
@Component({
selector: 'app-ng-content-child',
template: `<button type="button" (click)="onclick()">Click me to fire a custom event</button>`
})
export class NgContentChildComponent implements OnInit {
testData = 1;
@Output()
childEvent = new EventEmitter();
constructor() { }
ngOnInit() {}
onclick() {
this.childEvent.emit(this.testData);
}
}
还有一个parent-component
import {Component, OnInit} from '@angular/core';
@Component({
selector: 'app-ng-content-parent',
template: `<app-ng-content-child (childEvent)="onchildevent()"></app-ng-content-child>`
})
export class NgContentParentComponent implements OnInit {
constructor() { }
ngOnInit() {}
onchildevent(data) {
console.log(data);
}
}
我从子组件output到父组件。。为什么console.log那句是undefined？
另外，必须在附件组件中嵌入子组件，且在子组件上加监听器才可以在父组件中获得子组件的值妈？
