Angular4.x Event (DOM事件和自定义事件详解)

<button (click)="onClick()">Click</button>

import { Component } from '@angular/core';

@Component({
 selector: 'exe-app',
 template: `
 <div (click)="onClick()">
 <button>Click</button>
 </div>
 `
})
export class AppComponent {
 onClick() {
 console.log('Click');
 }
}

Click

import { Component } from '@angular/core';

@Component({
 selector: 'event-bubbling',
 template: `
 <div>
 <button>Click</button>
 </div>
 `
})
export class EventBubblingComponent { }

import { Component } from '@angular/core';

@Component({
 selector: 'exe-app',
 template: `
 <div>
 <event-bubbling (click)="onClick()"></event-bubbling>
 </div>
 `
})
export class AppComponent {
 onClick() {
 console.log('Click');
 }
}

import { Component, Output, EventEmitter } from '@angular/core';

@Component({
 selector: 'event-bubbling',
 template: `
 <div>
 <button (click)="onClick('Button 1')">Button 1</button>
 <button (click)="onClick('Button 2')">Button 2</button>
 </div>
 `
})
export class EventBubblingComponent {
 @Output() click = new EventEmitter();

 onClick(button: string) {
 this.click.next(button);
 }
}

import { Component } from '@angular/core';

@Component({
 selector: 'exe-app',
 template: `
 <div>
 <event-bubbling (click)="onClick($event)"></event-bubbling>
 </div>
 `
})
export class AppComponent {
 onClick(event: any) {
 console.log(event);
 }
}

Button 1 
MouseEvent {isTrusted: true, screenX: 69, screenY: 161, clientX: 43, clientY: 22…}

import { Component, Output, EventEmitter } from '@angular/core';

@Component({
 selector: 'event-bubbling',
 template: `
 <div>
 <button (click)="onClick($event, 'Button 1')">Button 1</button>
 <button (click)="onClick($event, 'Button 2')">Button 2</button>
 </div>
 `
})
export class EventBubblingComponent {
 @Output() click = new EventEmitter();

 onClick(event: Event, button: string) {
 event.stopPropagation();
 this.click.next(button);
 }
}

<a id="link" href="https://i.cnblogs.com/EditPosts.aspx?postid=7792556" rel="external nofollow" >Angular 4.x 事件冒泡</a>
<script>
 document.getElementById('link').onclick = function(ev) {
 ev.preventDefault(); // 阻止浏览器默认动作 (页面跳转)
 window.open(this.href); // 在新窗口打开页面
 };
</script>

<div>
 <button (click)="$event.stopPropagation(); doSomething()">Click me</button>
</div>

@Component({
 selector: 'exe-app',
 template: `
 <div>
 <button (click)="doSomething($event)">Click me</button>
 </div>`
})
export class AboutComponent {
 doSomething($event: Event) {
 $event.stopPropagation();
 // your logic
 }
}

<!-- the click event's propagation will be stopped -->
<a v-on:click.stop="doThis"></a>

<!-- the submit event will no longer reload the page -->
<form v-on:submit.prevent="onSubmit"></form>

<!-- the click event will be triggered at most once -->
<a v-on:click.once="doThis"></a>

<div class="parent" (click)="fromParent()">
 <button class="child" (click.stop)="fromChild()">Click me</button>
</div>

@Directive({
 selector: '[click.stop]'
})
export class StopPropagationDirective {
 @Output("click.stop") stopPropEvent = new EventEmitter();
 unsubscribe: () => void;

 constructor(
 private renderer: Renderer2, // Angular 2.x导入Renderer
 private element: ElementRef) {
 }

 ngOnInit() {
 this.unsubscribe = this.renderer.listen(
  this.element.nativeElement, 'click', event => {
  event.stopPropagation();
  this.stopPropEvent.emit(event);
  });
 }

 ngOnDestroy() {
 this.unsubscribe();
 }
}

import { Component } from '@angular/core';

@Component({
 selector: 'exe-app',
 template: `
 <div class="parent" (click)="fromParent()">
 <button class="child" (click.stop)="fromChild()">Click me</button>
 </div>
 `
})
export class AppComponent {
 fromChild() {
 console.log('I am Child');
 }

 fromParent() {
 console.log('I am Parent');
 }
}