1 |
60850
|
stefania.m
|
import {NavigationEnd, Router} from '@angular/router';
|
2 |
|
|
import {Injectable} from '@angular/core';
|
3 |
|
|
import {Subscription} from 'rxjs';
|
4 |
|
|
|
5 |
|
|
@Injectable({
|
6 |
|
|
providedIn: 'root'
|
7 |
|
|
})
|
8 |
|
|
export class SmoothScroll {
|
9 |
|
|
private interval;
|
10 |
|
|
private readonly sub;
|
11 |
|
|
private lastRoute;
|
12 |
|
|
|
13 |
|
|
constructor(private router: Router) {
|
14 |
|
|
this.sub = router.events.subscribe(event => {
|
15 |
|
|
if (event instanceof NavigationEnd) {
|
16 |
|
|
if(this.interval) {
|
17 |
|
|
clearInterval(this.interval);
|
18 |
|
|
}
|
19 |
|
|
const fragment = router.parseUrl(router.url).fragment;
|
20 |
|
|
if (fragment) {
|
21 |
|
|
let i = 0;
|
22 |
|
|
this.interval = setInterval(() => {
|
23 |
|
|
i++;
|
24 |
|
|
const element = document.getElementById(fragment);
|
25 |
|
|
if (element) {
|
26 |
|
|
if(this.interval) {
|
27 |
|
|
clearInterval(this.interval);
|
28 |
|
|
}
|
29 |
|
|
const yOffset = -100;
|
30 |
|
|
let position = 0;
|
31 |
|
|
let interval = setInterval(() => {
|
32 |
|
|
if(position !== element.getBoundingClientRect().top) {
|
33 |
|
|
position = element.getBoundingClientRect().top;
|
34 |
|
|
} else {
|
35 |
|
|
clearInterval(interval);
|
36 |
|
|
const y = element.getBoundingClientRect().top + window.pageYOffset + yOffset;
|
37 |
|
|
window.scrollTo({top: y, behavior: 'smooth'});
|
38 |
|
|
}
|
39 |
|
|
}, 50);
|
40 |
|
|
}
|
41 |
|
|
if(i > 4 && this.interval) {
|
42 |
|
|
clearInterval(this.interval);
|
43 |
|
|
}
|
44 |
|
|
}, 100);
|
45 |
|
|
} else {
|
46 |
|
|
if(this.lastRoute !== this.getUrl(event.url)) {
|
47 |
|
|
window.scrollTo({top: 0});
|
48 |
|
|
} else {
|
49 |
|
|
window.scrollTo({top: 0, behavior: "smooth"});
|
50 |
|
|
}
|
51 |
|
|
}
|
52 |
|
|
this.lastRoute = this.getUrl(event.url);
|
53 |
|
|
}
|
54 |
|
|
});
|
55 |
|
|
}
|
56 |
|
|
|
57 |
|
|
private getUrl(url: string) {
|
58 |
|
|
return url.split('?')[0].split('#')[0];
|
59 |
|
|
}
|
60 |
|
|
|
61 |
|
|
public clearSubscriptions() {
|
62 |
|
|
if(this.sub && this.sub instanceof Subscription) {
|
63 |
|
|
this.sub.unsubscribe();
|
64 |
|
|
}
|
65 |
|
|
if(this.interval) {
|
66 |
|
|
clearInterval(this.interval);
|
67 |
|
|
}
|
68 |
|
|
}
|
69 |
|
|
}
|