Bootstrap 5 Navbar Dropdown: Why Doesn't My Dropdown Collapse, and How Do I Fix It?

Bootstrap 5 Navbar Dropdown Issue: Resolving Collapse Functionality

This discussion addresses challenges encountered when attempting to create a responsive menu or dropdown button using Bootstrap 5. Despite incorporating the necessary navigation and dropdown icons, the dropdown menu remains unresponsive. Additionally, the author has encountered difficulties with other Bootstrap classes such as mr-auto and ml-auto.

The root cause of these issues lies in the transition from Bootstrap 4 to Bootstrap 5. Bootstrap 5 introduces significant changes, including the replacement of data- attributes with data-bs- attributes for all JavaScript plugins. This modification applies to various JavaScript components, including Collapse, Navbar, Carousel, Dropdown, Tabs, and Modal.

To resolve the dropdown collapse issue, the following snippet illustrates the correct syntax:

<button class="navbar-toggler" data-bs-toggle="collapse" data-bs-target="#navbar">
    <span class="navbar-toggler-icon"></span>
</button>

This ensures that the data attributes conform to Bootstrap 5 conventions.

In addition, Bootstrap 5 introduces new classes for managing horizontal alignment, such as ms-auto and me-auto, which replace the previously used ml-auto and mr-auto classes.

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