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import {NavigationEnd, Router} from '@angular/router';
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import {Injectable} from '@angular/core';
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import {Subscription} from 'rxjs';
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@Injectable({
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providedIn: 'root'
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})
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export class SmoothScroll {
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private interval;
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private readonly sub;
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private lastRoute;
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constructor(private router: Router) {
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this.sub = router.events.subscribe(event => {
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if (event instanceof NavigationEnd) {
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if (this.interval) {
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clearInterval(this.interval);
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}
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const fragment = router.parseUrl(router.url).fragment;
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if (this.lastRoute !== this.getUrl(event.url)) {
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window.scrollTo({top: 0});
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}
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if (fragment) {
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let i = 0;
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this.interval = setInterval(() => {
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i++;
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const element = document.getElementById(fragment);
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if (element) {
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if (this.interval) {
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clearInterval(this.interval);
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}
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const yOffset = -100;
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let position = 0;
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let interval = setInterval(() => {
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if (position !== element.getBoundingClientRect().top) {
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position = element.getBoundingClientRect().top;
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} else {
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clearInterval(interval);
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const y = element.getBoundingClientRect().top + window.pageYOffset + yOffset;
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window.scrollTo({top: y, behavior: 'smooth'});
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}
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}, 50);
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}
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if (i > 4 && this.interval) {
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clearInterval(this.interval);
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}
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}, 100);
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} else {
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window.scrollTo({top: 0, behavior: 'smooth'});
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}
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this.lastRoute = this.getUrl(event.url);
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}
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});
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}
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private getUrl(url: string) {
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return url.split('?')[0].split('#')[0];
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}
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public clearSubscriptions() {
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if (this.sub && this.sub instanceof Subscription) {
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this.sub.unsubscribe();
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}
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if (this.interval) {
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clearInterval(this.interval);
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}
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}
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}
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