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Discover how to create a `scrollable div` within a flexbox layout, ensuring a smooth responsive design for your sidebar elements.
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Make a Div Scrollable Inside Flexbox: A Complete Guide to Dynamic Resizing

When developing modern web applications, creating an intuitive and user-friendly interface is crucial. This often involves incorporating sidebars with flexible panels that can adapt to varying screen sizes. A common requirement is to make one panel scrollable while keeping another panel fixed in size. If you've ever tried to implement this feature, you might have encountered the problem of bottom panels being pushed down when resizing. In this guide, we will explore how to create a sidebar with a scrollable div inside a flexbox layout.

The Problem: Dynamic Resizing of Panels

Imagine you have a sidebar with two panels:

The Top Panel: It should resize dynamically.

The Bottom Panel: It should maintain a fixed height regardless of the sidebar’s total height.

When the total height of the sidebar is smaller than the combined height of both panels, the top panel should shrink, allowing scrolling for any overflowing content. This behavior mimics the sidebar in applications like Visual Studio Code which dynamically adjusts panels as the window size changes.

The Solution: Implementing Scrollable Functionality

To achieve the desired functionality where the top panel becomes scrollable, we will utilize the overflow-y CSS property along with some structural changes in our HTML and CSS.

Step 1: Basic Structure

Our HTML structure will look like this:

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

Step 2: CSS Styles

Next, we will add styling to achieve the scrolling effect. The key properties to focus on are:

overflow-y: auto for the top panel

A fixed height for the bottom panel

Here’s how the CSS will look:

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

Step 3: JavaScript Content Duplication

To demonstrate the scrollable behavior, you might want to populate the top panel with several items dynamically. Here’s a quick JavaScript snippet to clone list items:

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

Full Picture: Putting It All Together

With the established structure and styles, you now have a responsive sidebar where the top panel will shrink and become scrollable as needed. You can adjust the height of the bottom panel to suit your design preferences, ensuring the top panel responds appropriately to window resizing.

Conclusion

Creating a scrollable div inside a flexbox layout not only enhances user experience but also optimizes the space utilized on the application interface. By understanding the flexbox properties and leveraging CSS solutions like overflow-y, you can effectively manage the dynamic behavior of your panels.

By implementing these tips, you can emulate the behavior seen in applications like VS Code, offering seamless navigation within your web applications. Happy coding!