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Is there a way to toggle dark mode in Bootstrap using theme variables dynamically?

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Is there a way to toggle dark mode in Bootstrap using theme variables dynamically?

Asked on Oct 24, 2025

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Yes, you can toggle dark mode in Bootstrap by dynamically changing theme variables using JavaScript. This involves switching between Bootstrap's default and dark theme CSS classes.

<!-- BEGIN COPY / PASTE -->
        <link href="https://stackpath.bootstrapcdn.com/bootstrap/5.3.0/css/bootstrap.min.css" rel="stylesheet">
        <link href="https://stackpath.bootstrapcdn.com/bootstrap/5.3.0/css/bootstrap-dark.min.css" rel="stylesheet" id="dark-theme" disabled>

        <div class="container">
            <button id="toggle-theme" class="btn btn-primary mt-3">Toggle Dark Mode</button>
        </div>

        <script>
            const toggleButton = document.getElementById('toggle-theme');
            const darkTheme = document.getElementById('dark-theme');

            toggleButton.addEventListener('click', () => {
                darkTheme.disabled = !darkTheme.disabled;
            });
        </script>
        <!-- END COPY / PASTE -->

Additional Comment:

The example uses two Bootstrap CSS files: one for the default theme and one for the dark theme.
The `dark-theme` link element is initially disabled to load the default theme.
JavaScript toggles the `disabled` attribute of the `dark-theme` link to switch themes.
Ensure both CSS files are correctly linked from a CDN or local files.

✅ Answered with Bootstrap 5 best practices.

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Is there a way to toggle dark mode in Bootstrap using theme variables dynamically?

Asked on Oct 24, 2025

Answer

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