小程序开发中组件通信之自定义事件与Angular的组件交互之监听事件

小程序(使用triggerEvent实现)

【https://developers.weixin.qq.com/miniprogram/dev/framework/custom-component/events.html】

  • 监听事件
<!-- 当自定义组件触发“myevent”事件时,调用“onMyEvent”方法 -->
<component-tag-name bindmyevent="onMyEvent" />
<!-- 或者可以写成 -->
<component-tag-name bind:myevent="onMyEvent" />
Page({
  onMyEvent(e) {
    e.detail // 自定义组件触发事件时提供的detail对象
  }
})

 

  • 触发事件

自定义组件触发事件,需要使用 triggerEvent 方法,指定事件名、detail对象和事件选项:

<!-- 在自定义组件中 -->
<button bindtap="onTap">点击这个按钮将触发“myevent”事件</button>
Component({
  properties: {},
  methods: {
    onTap() {
      const myEventDetail = {} // detail对象,提供给事件监听函数
      const myEventOption = {} // 触发事件的选项
      this.triggerEvent('myevent', myEventDetail, myEventOption)
    }
  }
})

 

 Angular(使用EventEmitter实现)(父组件监听子组件的事件)

【https://angular.cn/guide/component-interaction】

import { Component, EventEmitter, Input, Output } from '@angular/core';
 
@Component({
  selector: 'app-voter',
  template: `
    <h4>{{name}}</h4>
    <button (click)="vote(true)"  [disabled]="didVote">Agree</button>
    <button (click)="vote(false)" [disabled]="didVote">Disagree</button>
  `
})
export class VoterComponent {
  @Input()  name: string;
  @Output() voted = new EventEmitter<boolean>();
  didVote = false;
 
  vote(agreed: boolean) {
    this.voted.emit(agreed);
this.didVote = true;
  }
}
import { Component }      from '@angular/core';
 
@Component({
  selector: 'app-vote-taker',
  template: `
    <h2>Should mankind colonize the Universe?</h2>
    <h3>Agree: {{agreed}}, Disagree: {{disagreed}}</h3>
    <app-voter *ngFor="let voter of voters"
      [name]="voter"
      (voted)="onVoted($event)">
    </app-voter>
  `
})
export class VoteTakerComponent {
  agreed = 0;
  disagreed = 0;
  voters = ['Mr. IQ', 'Ms. Universe', 'Bombasto'];
 
  onVoted(agreed: boolean) {
    agreed ? this.agreed++ : this.disagreed++;
  }
}

 

 

当然了,angular中还有其他办法实现组件通讯,比如使用服务等。

posted @ 2019-01-03 13:53  彩泉  阅读(721)  评论(0编辑  收藏  举报