為什麼我的 Bootstrap 5 導覽列下拉選單沒有折疊？

Bootstrap 5 Navbar Dropdown Issue: Collapse Not Working

In Bootstrap 5, the navbar's dropdown menu may not collapse when clicked. This issue arises due to a change in attribute naming conventions from Bootstrap 4 to Bootstrap 5.

To resolve this issue, replace the data- attributes with data-bs- accordingly:

<button>

Replace with:

<button>

Additional Considerations

Bootstrap 5 introduces several breaking changes. Notably, the ml-auto and mr-auto classes have been replaced with ms-auto and me-auto, respectively. Ensure that these classes are updated to avoid alignment issues.

Summary

To fix the navbar dropdown collapse issue in Bootstrap 5, replace data- attributes with data-bs- and align your classes according to the bootstrap 5 documentation. These changes will ensure proper functionality and visual consistency.

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