Build a Scroll Progress Bar — Pure JavaScript |
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Learn how to build a scroll progress bar and live percentage counter in pure JavaScript — no libraries, no frameworks, just a scroll event and two lines of math that calculate exactly how far down the page the user has scrolled.
You'll build two components: a fixed progress bar at the top of the page that fills with a glowing cyan gradient, and a circular percentage readout that updates live as you scroll. The kind of UI detail that separates polished pages from amateur ones.
🔥 What You'll Learn:
Calculating scroll progress using scrollY and scrollHeight
Normalizing scroll position to a 0–100 percentage value
Updating a CSS width property live from JavaScript
Building a fixed top progress bar with a glowing gradient
Creating a glassmorphism circular progress indicator
Displaying a live percentage with Math.round()
Making both components responsive across desktop, tablet, mobile
If this series is showing you what vanilla JavaScript can actually do, drop a 👍 and subscribe — every episode is one more tool in the kit.
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