Creating a Dynamic Progress Bar with Scroll Events in Vanilla JavaScript

Learn how to implement a responsive and interactive `progress bar` that reflects scrolling within a specified div, rather than the entire body, using Vanilla JavaScript.
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This video is based on the question https://stackoverflow.com/q/67168440/ asked by the user 'Ghost' ( https://stackoverflow.com/u/9828581/ ) and on the answer https://stackoverflow.com/a/67169487/ provided by the user 'سعيد' ( https://stackoverflow.com/u/13999386/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Dynamic Progress Bar with Scroll Events in Vanilla JavaScript

Scrolling is a fundamental interaction on the web. It allows users to move between different sections of content in a seamless manner. However, presenting users with visual feedback during scrolling can enhance their experience significantly. In this guide, we will explore how to create a dynamic progress bar that tracks the scroll position within a specific div rather than the entire page body.

The Problem: Tracking Scroll within a Div

If you’ve ever worked with scroll events, you may have faced the challenge of making your progress bar aware not just of the overall page scroll, but of a specific section, or div. This becomes especially important when dealing with timelines or any other content that has defined boundaries.

Here’s what we want to achieve:

A progress bar that reflects the scroll position only within a designated content area.

The bar should dynamically adjust as the user scrolls, filling up only as they move through the content.

The Solution: Step-by-Step Guide

To create this progress bar, we’ll use Vanilla JavaScript. Below are the components we need to implement.

1. HTML Structure

Begin by defining the basic structure of your HTML. We need a header for the title and progress bar, and a content div that will hold all scrollable content.

[[See Video to Reveal this Text or Code Snippet]]

2. CSS Styles

Next, style the body and your progress bar. Adjust the overall layout to meet design preferences.

[[See Video to Reveal this Text or Code Snippet]]

3. JavaScript Functionality

Now, let’s write the JavaScript function to handle the scroll events and update the progress bar.

[[See Video to Reveal this Text or Code Snippet]]

4. Putting it All Together

Once you have your HTML, CSS, and JavaScript in place, load your page in a browser. As you scroll within the content div, the progress bar should increase in width, giving a clear indication of how far you are through that section.

Conclusion

With this implementation, you’ve successfully created a dynamic progress bar that enhances the user experience by providing real-time feedback based on the scroll position within a specific div. This method can be modified and enhanced for richer content interactions, so feel free to experiment further!

Final Thoughts

Incorporating interactive elements like a progress bar can significantly improve the usability of your web applications, making them more engaging and easier to navigate.

Try It Out!

Feel free to modify the example provided to include additional styling or functionality that suits your project needs. Enjoy coding!

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