What causes the unusual behavior of `overflow-x: auto;` when used within a parent element with `flex-direction: row;` styling

I have gone through numerous other queries regarding horizontally scrolling tables, but none seem to address this particular problem.

When using a responsive table in the default Blazor Server template of a new project built with Bootstrap 4, the browser window remains scrollable despite implementing Bootstrap's .table-responsive, which utilizes overflow-x: auto;. This behavior persists even when the parent container has a fixed width.

Scenario Simplification

This example aims to minimize complexity by utilizing Bootstrap's core CSS feature - overflow-x: auto;. The issue might be related to the interaction between flex properties and multiple nested div elements separating the parent flex container from the overflow-x: auto; element.

To observe the mentioned behavior, access the following Codeply view, resize your browser to its smallest width, and notice how the table scrolls while the window content also scrolls:

Code Snippet

<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>LayoutTest</title>
        <base href="/">
    </head>
    <body>
        <app style="display: flex; flex-direction: row;">
            <div class="sidebar">
                <div class="top-row pl-4 navbar navbar-dark">
                    <a class="navbar-brand" href="">LayoutTest</a>
                    <button class="navbar-toggler">
                        <span class="navbar-toggler-icon"></span>
                    </button>
                </div>

                <div class="collapse">
                    <ul class="nav flex-column">
                        <li class="nav-item px-3">
                            <a href="" class="nav-link active">
                                <span class="oi oi-home" aria-hidden="true"></span> Home
                            </a>
                        </li>
                        <li class="nav-item px-3">
                            <a href="counter" class="nav-link">
                                <span class="oi oi-plus" aria-hidden="true"></span> Counter
                            </a>
                        </li>
                        <li class="nav-item px-3">
                            <a href="fetchdata" class="nav-link">
                                <span class="oi oi-list-rich" aria-hidden="true"></span> Fetch data
                            </a>
                        </li>
                    </ul>
                </div>
            </div>

            <div style="width: 500px;">
                <div style="overflow-x: auto;">
                    <table class="table">
                        <thead>
                            <tr>
                                <th scope="col">#</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                                <th scope="col">Heading</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr>
                                <th scope="row">1</th>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                            </tr>
                            <tr>
                                <th scope="row">2</th>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                            </tr>
                            <tr>
                                <th scope="row">3</th>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                                <td>Cell</td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </app>
    </body>
</html>
cssbootstrap-4flexboxoverflowblazor-server-side

Answer №1

To resolve this issue, simply apply the overflow-x property to the parent element with a flex display and set the min-width value to 0 for its child, which is one level above the element that needs to overflow.

Sample Code Link

Code Example

<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>ExampleLayout</title>
        <base href="/">
    </head>
    <body>
        <app style="display: flex; flex-direction: row; overflow-x: hidden;">
            <div class="sidebar">
                <div class="top-row pl-4 navbar navbar-dark">
                    <a class="navbar-brand" href="">ExampleLayout</a>
                    <button class="navbar-toggler">
                        <span class="navbar-toggler-icon"></span>
                    </button>
                </div>

                <div class="collapse">
                    <ul class="nav flex-column">
                        <li class="nav-item px-3">
                            <a href="" class="nav-link active">
                                <span class="oi oi-home" aria-hidden="true"></span> Home
                            </a>
                        </li>
                        <li class="nav-item px-3">
                            <a href="counter" class="nav-link">
                                <span class="oi oi-plus" aria-hidden="true"></span> Counter
                            </a>
                        </li>
                        <li class="nav-item px-3">
                            <a href="fetchdata" class="nav-link">
                                <span class="oi oi-list-rich" aria-hidden="true"></span> Fetch data
                            </a>
                        </li>
                    </ul>
                </div>
            </div>

            <div style="min-width: 0;">
                <div style="overflow-x: auto;">
                    <table class="table">
                        <thead>
                            <tr>
                                <th scope="col">#</th>
                                <th scope="col">Title</th>
                                <th scope="col">Category</th>
                                <th scope="col">Date</th>
                                <th scope="col">Status</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr>
                                <th scope="row">1</th>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                            </tr>
                            <tr>
                                <th scope="row">2</th>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                            </tr>
                            <tr>
                                <th scope="row">3</th>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                                <td>Data</td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </app>
    </body>
</html>

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