HowTo

Prefill a HubSpot Form in a React App

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I have a React App with a HubSpot contact form. The user must be logged into submit the form so I wanted to prefill their email address.

Fortunately, HubSpot Forms API provides a onFormReady callback!

Code Sample

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const HubSpotContactForm = () => {
  const { getClaims } = useAmplify();
  const [email, setEmail] = useState<string>('');

  useEffect(() => {
    getClaims().then((d) => setEmail(d?.email));
  }, []);

  useEffect(() => {
    if (email) {
      const script = document.createElement('script');
      script.src = 'https://js.hsforms.net/forms/v2.js';
      document.body.appendChild(script);

      script.addEventListener('load', () => {
        const hbspt = (window as any).hbspt;
        if (hbspt) {
          hbspt.forms.create({
            portalId: 'TODO',
            formId: 'TODO',
            target: '#hubspotForm',
            onFormReady: function ($form: any) {
              const emailInput = $form[0];
              emailInput.value = email;
              emailInput.dispatchEvent(new Event('input', { bubbles: true }));
            },
          });
        }
      });
    }
  }, [email]);

  return (
    <Container
      header={
        <Header
          variant="h2"
          description="Submit any questions or feedback here and we will get back to you shortly"
        >
          Contact Form
        </Header>
      }
    >
      <div id="hubspotForm"></div>
    </Container>
  );
};
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