Question

我正在寻找一个例子来解释使用事件发射的父子交互如何在angular2-rc6版本中工作（不再使用指令）。在线提供的大多数链接似乎都有指令标记功能（angular2的旧版本）。

Answer 1

上查看此链接

<强> VoterComponent

import { Component, EventEmitter, Input, Output } from '@angular/core';
@Component({
  selector: 'my-voter',
  template: `
    <h4>{{name}}</h4>
    <button (click)="vote(true)"  [disabled]="voted">Agree</button>
    <button (click)="vote(false)" [disabled]="voted">Disagree</button>
  `
})
export class VoterComponent {
  @Input()  name: string;
  @Output() onVoted = new EventEmitter<boolean>();
  voted = false;
  vote(agreed: boolean) {
    this.onVoted.emit(agreed);
    this.voted = true;
  }
}

VoteTakerComponent

import { Component }      from '@angular/core';
@Component({
  selector: 'vote-taker',
  template: `
    <h2>Should mankind colonize the Universe?</h2>
    <h3>Agree: {{agreed}}, Disagree: {{disagreed}}</h3>
    <my-voter *ngFor="let voter of voters"
      [name]="voter"
      (onVoted)="onVoted($event)">
    </my-voter>
  `
})
export class VoteTakerComponent {
  agreed = 0;
  disagreed = 0;
  voters = ['Mr. IQ', 'Ms. Universe', 'Bombasto'];
  onVoted(agreed: boolean) {
    agreed ? this.agreed++ : this.disagreed++;
  }
}

希望这会有所帮助!!

angular2 rc6事件发射器 - 父子交互示例

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