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Hide/show additional fields depending on whether the checkbox is checked using formstate and hook_from_alter

There is an entity form on the website. This entity form has a checkbox with the label Remind me about an event
If the checkbox is checked, I need to display two additional fields in this entity:

  1. Select list (where reminder message templates will be)
  2. Field for email (where you can enter an email where to send a reminder about the event)

This needs to be done using formstate and hook_form_alter. If I understood correctly the formstate will show me whether the checkbox is checked and hook_form_alter will add these two fields if the checkbox is checked.

Can you recommend any articles, manuals, code examples, or videos to do this task?

This article was republished from its original source.
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Hide/show additional fields depending on whether the checkbox is checked using formstate and hook_from_alter

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