Integrating Flexbox and Vertical Scroll in a Full-Height Layout

When working with full-height applications, combining flexbox and a vertical scrollbar can be a common requirement. However, it can pose challenges due to the interactive nature of flexbox layouts.

Traditional Flexbox Approach (Old Properties)

Flexbox layouts using the old syntax (display: box) permit full-height apps with vertical scrolling in certain browsers. This solution relies on setting flex-direction to column and using overflow-y: auto on the parent element.

Issues with Using Newer Flexbox Properties

Trying to apply the newer flexbox properties with a full-height and scrollable design introduces limitations. The workaround using height: 0px; on a wrapper element is unreliable and creates additional issues.

Solution: Setting Height for Vertical Scrolling Element

A robust solution involves setting a specific height for the element where vertical scrolling is desired. This allows the flexbox algorithm to calculate the appropriate height and render the scrollbar as needed. For instance, using the following CSS:

#container article {
    flex: 1 1 auto;
    overflow-y: auto;
    height: 0px;
}

Determining Minimum Height

If a minimum height is required, replace height: 0px; with min-height: desired value; to ensure the element displays a scrollbar even when its content does not exceed the specified minimum.

Final Example

In summary, the most effective solution to combine flexbox and vertical scrolling in a full-height layout is to set a height (or min-height) for the vertically scrollable element. This allows for optimal rendering and scrollbar behavior, resulting in a seamless user experience.