src/app/common-components/multiselect-dropdown/clickOutside.ts

/**
******************************************************************************
* Copyright © 2017-2018 PTA GmbH.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* 
*     http://www.eclipse.org/legal/epl-v10.html
* 
******************************************************************************
*/
import {Directive, ElementRef, Output, EventEmitter, HostListener} from '@angular/core';

@Directive({
    selector: '[clickOutside]'
})
export class ClickOutsideDirective {
    constructor(private _elementRef: ElementRef) {
    }

    @Output()
    public clickOutside = new EventEmitter<MouseEvent>();

    @HostListener('document:click', ['$event', '$event.target'])
    public onClick(event: MouseEvent, targetElement: HTMLElement): void {
        if (!targetElement) {
            return;
        }

        const clickedInside = this._elementRef.nativeElement.contains(targetElement);
        if (!clickedInside) {
            this.clickOutside.emit(event);
        }
    }
}