directive click outside angular 6

问题

I upgraded my Angular from 4 to 6, and consequently had a problem with my click-off policy, it stopped working on all components.

my directive:

import { Directive, Output, EventEmitter, ElementRef, HostListener } from '@angular/core';

@Directive({
  selector: '[clickOutside]'
})
export class ClickOutsideDirective {

  constructor(private _elementRef : ElementRef) { }

  @Output()
  public clickOutside = new EventEmitter();

  @HostListener('document:click', ['$event.target'])
  public onClick(targetElement) {
      const clickedInside = this._elementRef.nativeElement.contains(targetElement);
      if (!clickedInside) {
          this.clickOutside.emit(null);
      }
  }
}

My component.html that makes use of this directive:

<div id="sidenav" *ngIf="this.opened" class="sidenav" [ngClass]="getClasses()" [ngStyle]="getStyles()" clickOutside (clickOutside)="closeOutsideSidenav()">
  <header> {{ navTitle }} </header>
  <i *ngIf="this.showCloseButton" class="iconic iconic-x-thin close-icon" (click)="closeSidenav()"></i>
  <ng-content></ng-content>
</div>
<div *ngIf="this.backdrop && this.opened" class="sidenav-backdrop"></div>

回答1:

You're referencing "this" in your template, which is not necessary. I made a working example of that directive:

https://stackblitz.com/edit/angular-piqewb

And theres no reason to have the directive on the div twice.

<div id="sidenav" *ngIf="opened" class="sidenav" [ngClass]="getClasses()" [ngStyle]="getStyles()" (clickOutside)="closeOutsideSidenav()">
    <header> {{ navTitle }} </header>
    <i *ngIf="showCloseButton" class="iconic iconic-x-thin close-icon" (click)="closeSidenav()"></i>
    <ng-content></ng-content>
</div>

<div *ngIf="backdrop && opened" class="sidenav-backdrop"></div>

回答2:

view:

<div #insideElement></div>

component:

export class SomeClass {
  @ViewChild("insideElement") insideElement;
  @HostListener('document:click', ['$event.target'])

  public onClick(targetElement) {
    const clickedInside = this.insideElement.nativeElement.contains(targetElement);
    if (!clickedInside) {
      console.log('outside clicked');
    }
  }
}

回答3:

Run the inside NgZone.

Example:

export class AppComponent {
  opened: boolean = false;

  constructor(private ngZone: NgZone) {
  }

  closeOutsideSidenav(e) {
    this.ngZone.run(() => {
      this.opened = !this.opened;
    })
  }
}

I added my code to stackblitz. https://stackblitz.com/edit/angular-gyhtym (click outside of the "Highlight Me!")

来源：https://stackoverflow.com/questions/50531212/directive-click-outside-angular-6