Determining the anchor in view using javascript: A guide

I've created a navigation tab with links to different sections of the page, each identified by unique ids:

<section id="1"></section>
<section id="2"></section>
<section id="3"></section>

These sections are then linked in the navigation bar like so:

<a href="#1"></a>

Now I'm looking to add custom styling to these navigation links when their corresponding section is visible in the browser viewport.

Currently, when a link is clicked, the id is added to the URL. However, I want the styling to apply even if the user hasn't clicked any links, making this solution inadequate for my needs.

Is there a CSS property that can be checked using JavaScript to determine if a specific section is in view?

I'm seeking a solution that is responsive across various screen sizes.

javascripthtmlcss

Answer №1

One potential solution is to implement a custom scrollSpy feature or something of the sort. The objective is to identify which elements are currently visible on the screen and apply corresponding classes via JavaScript.

If you prefer, this can also be accomplished without any external libraries:

  1. Monitor scroll events across the entire document
  2. Execute your calculation function (consider implementing throttling)
  3. Identify all navigation items and determine if they are within viewport range (offsetTop + height)
  4. Apply appropriate classes based on the visibility status

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