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Basic Form

Add a form to any Jekyll page or layout:
_includes/contact-form.html
<form action="https://spike.ac/api/f/YOUR_FORM_SLUG" method="POST">
  <input type="hidden" name="_next" value="{{ site.url }}/thank-you/">
  <input type="text" name="_gotcha" style="display:none">
  
  <label for="name">Name</label>
  <input type="text" id="name" name="name" required>
  
  <label for="email">Email</label>
  <input type="email" id="email" name="email" required>
  
  <label for="message">Message</label>
  <textarea id="message" name="message" required></textarea>
  
  <button type="submit">Send</button>
</form>

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Include in Page

contact.md
---
layout: page
title: Contact
---

# Contact Us

{% include contact-form.html %}

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With Config

Store your form slug in _config.yml:
_config.yml
spike_form_slug: YOUR_FORM_SLUG
_includes/contact-form.html
<form action="https://spike.ac/api/f/{{ site.spike_form_slug }}" method="POST">
  <input type="text" name="_gotcha" style="display:none">
  
  <input type="text" name="name" required>
  <input type="email" name="email" required>
  <textarea name="message" required></textarea>
  
  <button type="submit">Send</button>
</form>

​
AJAX Submission

Add JavaScript for submission without page reload: 
<form id="contact-form" action="https://spike.ac/api/f/{{ site.spike_form_slug }}" method="POST">
  <input type="text" name="_gotcha" style="display:none">
  
  <input type="email" name="email" required>
  <textarea name="message" required></textarea>
  
  <button type="submit">Send</button>
  <p id="form-status"></p>
</form>

<script>
document.getElementById('contact-form').addEventListener('submit', async function(e) {
  e.preventDefault();
  const form = this;
  const status = document.getElementById('form-status');
  
  status.textContent = 'Sending...';
  
  try {
    const res = await fetch(form.action, {
      method: 'POST',
      body: new FormData(form),
      headers: { 'Accept': 'application/json' }
    });
    
    status.textContent = res.ok ? 'Thanks!' : 'Error, try again.';
    if (res.ok) form.reset();
  } catch (err) {
    status.textContent = 'Error, try again.';
  }
});
</script>