Example of submitting form and validating javascript

submit-form-validating-react-component.js

// When submitting the form we use standard jquery validation 
$form.submit(function handleSubmit(ev) {
  // call the React address component instance and ask it to validate itself and return any errors 
  const errors = addressInstance.validate();
  // if there are errors cancel the form submit
  if(errors.length > 0) {
    ev.preventDefault();
  }
....
}