Angular - Tips for effectively positioning a fixed navbar while scrolling to sections sharing the same ID

In my Angular project, I've set up different sections on a page, each with its own unique ID. There's also a fixed-position navbar for easy navigation between these sections. My main objective is to ensure that when a user clicks on a menu item (like Section2), the navbar aligns properly as depicted in the linked image.

https://i.sstatic.net/7tRfNGeK.png

To demonstrate the issue, I've prepared a StackBlitz demo. However, due to a compilation error, I had to comment out the line

<!-- <app-nav></app-nav> -->
in the StackBlitz demo:

Stackblitz Demo

Although I couldn't resolve the compilation error, my primary concern lies in correctly positioning the navbar so it functions seamlessly while scrolling to various sections.

app.routes.ts

export const routes: Routes = [
  { path: 'section-1', component: Section1Component },
  { path: 'section-2', component: Section2Component },
  { path: 'section-3', component: Section3Component },
  { path: 'section-4', component: Section4Component },
  { path: '**', redirectTo: '' },
];

main.ts

<div class="container">
  <!-- <app-nav></app-nav> -->
  <app-section1></app-section1>
  <app-section2></app-section2>
  <app-section3></app-section3>
  <app-section4></app-section4>
</div>

nav.component.ts

export class NavComponent {
  constructor(private viewportScroller: ViewportScroller) {}

  public scrollToSection(sectionId: string): void {
    this.viewportScroller.scrollToAnchor(sectionId);
  }
}

Answer №1

To improve the scrolling functionality, it is recommended to calculate the position for placing the selected section after the navbar instead of directly scrolling to the element by ID.

Keep in mind that there is a limitation with this approach when reaching the end of the page as certain sections like <app-section-3> and <app-section-4> may not be able to pin after the navbar (You can view the StackBlitz link and open the Preview in a new tab for full screen).

public scrollToSection(sectionId: string): void {
  const element = document.getElementById(sectionId)!;
  const navElement = document.getElementsByTagName('nav')[0]!;

  const navHeight = navElement.offsetHeight;

  const targetPosition = element.getBoundingClientRect().top + window.scrollY;

  this.viewportScroller.scrollToPosition([0, targetPosition - navHeight]);    
}

Alternatively, you can explore the use of scrollTo which offers similar functionality along with scroll animation capabilities.

window.scrollTo({
 left: 0,
 top: targetPosition - navHeight,
 behavior: 'smooth'
});

Check out the Demo on StackBlitz

Answer №2

Consider placing the navigation bar at the end of your content, outside of the main container for a cleaner layout:

<div class="container">
    <app-section1></app-section1>
    <app-section2></app-section2>
    <app-section3></app-section3>
    <app-section4></app-section4>
</div>
<app-nav></app-nav>

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