Why are all my buttons triggering onSubmit? #

You may want to add a 'reset' or 'cancel' button to your form. When doing so, be wary of the type property passed to your <button/>. This can cause all buttons within your form to trigger onSubmit.

<button/> elements are automatically associated with parent <form/> elements:

If [the form property] is not specified, the <button> element will be associated to an ancestor <form> element, if one exists.

The default type property assigned to <button/> elements is submit. This causes the button to attempt to trigger their parent form's onSubmit handler, regardless of the button's own click handler. By changing type to button, your button will trigger your passed event handler instead of trying to submit the form.

For more information, refer to the MDN documentation.