How to make checkbox, choice and dropdown required?

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The “required” attribute for these elements is much harder to perform because of their features in html specification. Alike for other fields, you need to specify them in config.php:

Example:

required_fields = interests (Interests)

Also, you have to create hidden fields with the same names and blank values:

Example:

<input type="hidden" value="" name="interests">

<input type="checkbox" name="interests" value="Finance News">