Scroll to top of the page with click in angular 8

Question

I have angular 8 application.

And I have navigation buttons for next and previous. But so I want to archieve that you will be navigate to top of the page when next is triggerd.

So I have this:

 <h4 id="heading"  #goUp class="echeq-title">{{ currentEcheqPage.title }}</h4>

and ts file:

export class EcheqPageComponent implements OnInit, AfterViewInit {

  @Input() currentEcheqPage: EcheqPage;
  @Input() currentEcheqPager: EcheqPager;
  @ViewChild('goUp', {static: false}) contentPage: ElementRef;

  // We use template variables to query the components
  @ViewChildren('echeqElement') elementComponents: QueryList<EcheqElementComponent>;

  EcheqElement = EcheqElement;
  elementsChanged = true;
  container: HTMLElement;

  constructor( private echeqService: EcheqService ) { }

  ngOnInit() {
    // document.getElementById ('heading').scrollIntoView();
  }

  ngAfterViewInit(): void { 
    this.showUp();

  }
}

private showUp(): void {
    this.contentPage.nativeElement.scrollTo( 0, 0 );
  }

But I don't get error. But also it is not navigating to top of page. IN this case the h4 heading.

So what I have to change?

Thank you.

have you tried this ? https://stackoverflow.com/questions/44441089/angular4-scrolling-to-anchor — pbachman, May 04 '20 at 19:08
here is direct link https://stackoverflow.com/a/58684827/7302862, alternatively you can use ngx-page-scroll, i personally can recommend this library. — pbachman, May 04 '20 at 19:18

EdwinS95 · Accepted Answer · 2020-05-04T19:42:11.240

3

The document object in typescript/javascript, has a function called "scrollIntoView", which can be used to scroll to a specific element. In your case you could created a functions as seen on the snippet below:

showUp() {
    const element = document.querySelector('#goUp');
    element.scrollIntoView();
}

Hope that was helpful to you. :-)

edited May 04 '20 at 19:42

answered May 04 '20 at 19:34

EdwinS95

138
11

It's not in TypeScript only, obviously. TypeScript only provides type definitions. – Christian Vincenzo Traina May 04 '20 at 19:39
echeq-process.component.html:13 ERROR TypeError: Cannot read property 'scrollIntoView' of null at – May 04 '20 at 19:47
Try to change this:
{{ currentEcheqPage.title }}
into this:
{{ currentEcheqPage.title }}
– EdwinS95 May 04 '20 at 19:54
Just try to create a button, and add the function "showUp", to test if it works, afterwards you could add it to the angular lifecycle hooks ngAfterViewInit() or ngOnInit() – EdwinS95 May 04 '20 at 20:04
I made button: but when I press I see console.log message, but it doesnt goes up – May 04 '20 at 20:14
Have you made sure to scroll to the bottom before clicking the button? – EdwinS95 May 04 '20 at 20:52

score 3 · Answer 2 · answered May 05 '20 at 12:01

This is the solution:

  @ViewChild('goUp', { static: true }) contentPage: ElementRef;

 ngOnChanges(): void {
   this.showUp();
  }

  showUp() {
     this.contentPage.nativeElement.scrollIntoView();
  }

score 1 · Answer 3 · answered May 04 '20 at 19:37

1

If I understand you correctly, change the following section:

 private showUp(): void {
    window.scroll(0,0);
  }

answered May 04 '20 at 19:37

Alex

190
1
1
12

Okay, can you look at that https://stackblitz.com/edit/angular-scrolling-goto-top?file=app%2Fapp.component.ts the example is not mine but seems to work – Alex May 04 '20 at 19:56

Scroll to top of the page with click in angular 8

3 Answers3

{{ currentEcheqPage.title }}

{{ currentEcheqPage.title }}