74 lines
2.3 KiB
TypeScript
74 lines
2.3 KiB
TypeScript
import {ActivationStart, NavigationEnd, Router} from '@angular/router';
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import {Injectable, Type} 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 lastComponent;
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private currentComponent: string;
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constructor(private router: Router) {
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if (typeof window !== "undefined") {
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this.sub = router.events.subscribe(event => {
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if (event instanceof ActivationStart) {
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if(event.snapshot.component instanceof Type) {
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this.currentComponent = event.snapshot.component.name;
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}
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} else 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.lastComponent !== this.currentComponent) {
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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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setTimeout( () => {
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window.scrollTo({top: 0, behavior: 'smooth'});
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}, 0);
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}
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this.lastComponent = this.currentComponent;
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}
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});
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}
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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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