Validates an input form field value against the registration form as defined in the site dashboard.
validateInput() returns {valid: true}
if the value in the specified field is valid and throws an error if it's not valid.
You may want to call validateInput() in an input element's
onCustomValidation()
to validate an input while the form is being filled out.
Note: The frontend Events APIs aren't functional when previewing a site. View a published version of a site to see their complete functionality.
Name of the input field to validate.
Field names and values for a registration form.