EVENT RSVP · AJAX (VANILLA JS)

Event RSVP for AJAX (vanilla JS)

Attendance confirmation with headcount and dietary needs. Free for 500 submissions per month — no backend, no SDK, no plugin.

Get free access key Copy the code

500/mo free·no card·drop-in for AJAX (vanilla JS)

form.htmlhtml25 lines

01<form action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">
03  <input type="hidden" name="subject" value="New event RSVP">
04 
05  <label for="name">Your name *</label>
06  <input id="name" type="text" name="name" placeholder="Jane Builder" required>
07  <label for="email">Email *</label>
08  <input id="email" type="email" name="email" placeholder="jane@example.com" required>
09  <label for="attending">Will you attend? *</label>
10  <select id="attending" name="attending" required>
11    <option value="">Choose…</option>
12    <option>Yes — count me in</option>
13    <option>Maybe</option>
14    <option>No, I can't make it</option>
15  </select>
16  <label for="guests">How many guests are you bringing?</label>
17  <input id="guests" type="number" name="guests" placeholder="0">
18  <label for="dietary">Dietary preferences</label>
19  <input id="dietary" type="text" name="dietary" placeholder="Vegan, gluten-free, allergies…">
20 
21  <!-- honeypot — bots fill every field -->
22  <input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">
23 
24  <button type="submit">Send</button>
25</form>

500

submissions / mo, free

fields, ready to ship

code outputs

60s

from copy to inbox

§ 00AJAX (vanilla JS) + Event RSVPplatform-specific integration guide

Why AJAX (vanilla JS) developers choose splitforms for event rsvp

The event rsvp on this page integrates with AJAX (vanilla JS)'s development workflow using the form markup in your AJAX (vanilla JS) project. Whether you're deploying to a static host or a server-rendered platform, the form posts standard <code>FormData</code> to splitforms, so your backend complexity stays at zero. AJAX (vanilla JS)'s ecosystem has strong tooling for UI, but form delivery is a separate concern that splitforms handles independently — Free includes spam filtering and a submissions dashboard; Starter adds email notifications and webhooks.

§ 00Quick answerHTML · events

Yes — this is the shortest safe path for AJAX (vanilla JS).

Use the HTML snippet on this page, keep the event rsvp fields visible in your AJAX (vanilla JS) UI, and let splitforms handle delivery, spam filtering, storage, and webhooks.

best implementation

Paste the HTML version, then replace YOUR_ACCESS_KEY.

The posted payload contains your name, email, will you attend?, how many guests are you bringing?, dietary preferences. Required fields are your name, email and will you attend?.

native ajax (vanilla js) reality

Vanilla JS / AJAX forms have been the no-framework default since jQuery's heyday.

use case fit

Eventbrite charges 3.7% + $1.79 per ticket. For a free event, fundraiser, or private gathering, the RSVP form does the same job for $0 — and lives on your own domain.

§ 01Event RSVP × AJAX (vanilla JS)why this combination, in 80 words

Built for AJAX (vanilla JS) developers who hate operating a backend.

Splitforms is the form backend for AJAX (vanilla JS) sites. One POST endpoint, no SDK, no plugin — drop the event rsvp into a page and ship.

Splitforms is the form backend for AJAX (vanilla JS) sites. One POST endpoint, spam filtering, and a real dashboard — drop-in, no server, no PHP. Free for 500 dashboard submissions per month; Starter adds email, signed webhooks, exports, and retained uploads; Pro is $5/mo for 5,000.

✦ what you get on the free plan

✓500 form submissions per month
✓2 forms on Free; unlimited forms on Pro
✓Spam protection (honeypot + classifier)
✓Webhooks: Slack, Discord, WhatsApp, custom
✓CSV export of all submissions
✓Email notifications (CC and BCC on Pro)

§ 02Copy-paste codeHTML · 25 lines

Drop into any AJAX (vanilla JS) project.

Replace YOUR_ACCESS_KEY with your splitforms key, paste into a AJAX (vanilla JS) page, and ship. No build-time integration required.

form.htmlhtml25 lines

01<form action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">
03  <input type="hidden" name="subject" value="New event RSVP">
04 
05  <label for="name">Your name *</label>
06  <input id="name" type="text" name="name" placeholder="Jane Builder" required>
07  <label for="email">Email *</label>
08  <input id="email" type="email" name="email" placeholder="jane@example.com" required>
09  <label for="attending">Will you attend? *</label>
10  <select id="attending" name="attending" required>
11    <option value="">Choose…</option>
12    <option>Yes — count me in</option>
13    <option>Maybe</option>
14    <option>No, I can't make it</option>
15  </select>
16  <label for="guests">How many guests are you bringing?</label>
17  <input id="guests" type="number" name="guests" placeholder="0">
18  <label for="dietary">Dietary preferences</label>
19  <input id="dietary" type="text" name="dietary" placeholder="Vegan, gluten-free, allergies…">
20 
21  <!-- honeypot — bots fill every field -->
22  <input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">
23 
24  <button type="submit">Send</button>
25</form>

§ 03Setup3 steps · 60 seconds · zero config

Generate, embed, receive.

Three actions stand between you and your first event rsvp submission. None of them require a backend, a database, or a CAPTCHA library.

STEP 01GENERATE

Generate a free splitforms key

Create your form

key=sk_live_••••••••

STEP 02EMBED

Paste the event rsvp into your AJAX (vanilla JS) project

Drop the form snippet into a AJAX (vanilla JS) page, component, or layout. Replace YOUR_ACCESS_KEY with the key from your dashboard. The form action is a hard-coded URL — no env vars or build-time wiring needed.

snippethtml

<form action="https://splitforms.com/api/submit" method="POST">
  …
</form>

STEP 03RECEIVE

Receive submissions

Dashboard updates live on Free. Starter adds email delivery, signed webhooks, CSV export, Slack/Discord forwarding, and BCC to your team.

inbox · 1 newjust now

FROM contact@yoursite.com

New event RSVP

Maya Iyer maya@studio71.co

Loved the demo — quick question about pricing on the 3-year plan. Are usage limits per project or account-wide?

§ 03bEvent RSVP Form (Public / Private Events)template-specific playbook

The reason this event rsvp exists.

Webhooks into Notion / Airtable / Google Sheets · auto .ics calendar invite.

why it matters

Eventbrite, Splash, and Hopin take 3-7% of every paid ticket and charge subscription fees for the white-label option. For free events (fundraisers, private parties, conferences with sponsor-only revenue, weddings), the platform fees are pure waste. The RSVP form captures attending yes/no, guest count, plus-one names, dietary restrictions, and any custom fields (workshop preference for conferences, song requests for weddings). Webhook to a Notion / Airtable / Google Sheet for the running headcount, plus an automatic confirmation email. Final headcount goes to catering 5-7 days out, same as any platform would deliver.

route the submission

Capture attendance and party

Required: attending yes/no, guest count, plus-one names if applicable. Optional: dietary restrictions, song requests, workshop preference, accessibility needs.

Update the running list

Webhook to a Notion / Airtable / Google Sheet that the host references. Each RSVP appends a row; conditional formatting highlights special diets. Real-time headcount without spreadsheet work.

Confirm via email

Auto-respond with confirmation, event details, and a calendar invite (.ics file). Most guests forget the date once they've RSVP'd — calendar adds reduce no-shows by 30-40%.

§ 03cAJAX (vanilla JS) production notesnative path · deploy · gotchas

What changes when this event rsvp lives in AJAX (vanilla JS).

These notes come from the AJAX (vanilla JS) platform registry and are rendered on this template page so crawlers see the framework-specific answer without opening a separate guide.

without splitforms

Vanilla JS / AJAX forms have been the no-framework default since jQuery's heyday. Without splitforms, the 'AJAX' part is one fetch line; the operational part is everything else: a backend route, an SMTP provider, a database for submissions, a honeypot or reCAPTCHA, a thank-you page, error handling for HTTP 4xx/5xx, retry logic. For 'JS-only on a static host' setups (Cloudflare Pages, GitHub Pages, S3), there's literally no server to run the route on — historically that meant Formspree, Formspark, Web3Forms, Basin. Splitforms is the modern entry: same shape, better free tier, better spam filtering, and signed webhooks from Starter.

deploy notes

Vanilla JS deploys to any static host — the snippet is HTML + inline <script>, no build step. CSP: if your site sets connect-src 'self', add https://splitforms.com to the directive or fetch is blocked. Browser support: native fetch is in every browser back to Edge 18 — the snippet runs without polyfills on every market-share-relevant browser. The progressive-enhancement variant (Pattern B) keeps the form working when JS fails to load — useful on flaky networks, ad-blocked clients, or for accessibility tools that disable JS.

AJAX (vanilla JS) gotcha

Forgetting e.preventDefault() reloads the page

Without preventDefault, the browser does its own form submission to wherever the form's action attribute points (or the current page) AND your fetch runs. You see a flash, the page reloads, and your handler's effects are lost.

AJAX (vanilla JS) gotcha

FormData includes ALL form fields — even disabled ones get dropped

new FormData(form) skips inputs without a name attribute, skips disabled inputs, skips unchecked checkboxes/radios. If a field doesn't show up in your splitforms inbox, check whether it's disabled at submit time.

AJAX (vanilla JS) gotcha

fetch() doesn't reject on HTTP 4xx/5xx — only network errors

If splitforms returns a 401 (bad key) or 429 (rate limit), fetch resolves successfully. You have to check res.ok or data.success yourself. Wrapping in try/catch only catches network failures, not HTTP errors.

AJAX (vanilla JS) gotcha

Double-click submit fires two requests

Without disabling the button on the first click, a quick double-click sends two POSTs. Both succeed; the user sees one success message; you see two submissions. Always set button.disabled = true at the start of the handler.

PATTERN A

Pattern A — fetch + FormData + status element

Single submit listener. new FormData(form) reads inputs, append the access key, POST. Update an aria-live status <p> with the result. ~25 lines, no library. Use the same wiring for the event rsvp fields on this page.

pattern-a.htmlhtml16 lines

01<form id="cf">
02  <input name="email" type="email" required />
03  <textarea name="message" required></textarea>
04  <button type="submit">Send</button>
05  <p id="msg" aria-live="polite"></p>
06</form>
07<script>
08  document.getElementById("cf").addEventListener("submit", async (e) => {
09    e.preventDefault();
10    const fd = new FormData(e.currentTarget);
11    fd.append("access_key", "YOUR_ACCESS_KEY");
12    const r = await fetch("https://splitforms.com/api/submit", { method: "POST", body: fd });
13    const data = await r.json();
14    document.getElementById("msg").textContent = data.success ? "Thanks!" : (data.message || "Try again");
15  });
16</script>

PATTERN B

Pattern B — progressive enhancement (works without JS)

Form has a real action attribute and a redirect hidden field — works with JS disabled (browser POSTs natively, splitforms 302s). When JS is available, the listener intercepts for inline UX. Best of both worlds, no compromise. Use the same wiring for the event rsvp fields on this page.

pattern-b.htmlhtml13 lines

01<form id="cf" action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY" />
03  <input type="hidden" name="redirect"   value="/thanks.html" />
04  <input name="email" type="email" required />
05  <button type="submit">Send</button>
06</form>
07<script>
08  document.getElementById("cf").addEventListener("submit", async (e) => {
09    e.preventDefault();
10    const r = await fetch(e.target.action, { method: "POST", body: new FormData(e.target) });
11    if ((await r.json()).success) location.href = "/thanks.html";
12  });
13</script>

§ 04Field-by-field rundown5 fields · names you POST

What every field actually does.

Each field below ships in the event rsvp template — rename, remove, or add your own. Splitforms accepts any name you POST.

nameREQUIRED

TEXT

Your name

Greeting + dashboard label so submissions don't all read 'anonymous'.

placeholder · Jane Builder

emailREQUIRED

Email

Reply-to address — splitforms wires this so hitting reply goes back to the sender.

placeholder · jane@example.com

attendingREQUIRED

SELECT

Will you attend?

Dropdown — keeps responses normalised so you can filter the dashboard.

Yes — count me inMaybeNo, I can't make it

guests

NUMBER

How many guests are you bringing?

Standard input — splitforms accepts whatever you POST under this name.

placeholder · 0

dietary

TEXT

Dietary preferences

Logistics input you'd otherwise gather over email anyway.

placeholder · Vegan, gluten-free, allergies…

§ 05Event RSVP on other frameworks22 frameworks · same backend

One backend. Every framework.

The same event rsvp template works on every framework splitforms supports. Pick yours.

§ 06Questions9 answered

Event RSVP on AJAX (vanilla JS) — FAQ.

Direct answers, no marketing fluff. Missing one? Email hello@splitforms.com.

01Does this event rsvp work on AJAX (vanilla JS)?

Yes. The form is plain HTML with a single POST endpoint, so it runs on any AJAX (vanilla JS) site without server-side code, plugins, or SDKs. Drop the snippet into a AJAX (vanilla JS) page or component and submissions land in your splitforms dashboard.

02How much does the event rsvp cost on AJAX (vanilla JS)?

Free for 500 submissions per month — no credit card, no trial. Pro is $5/mo for 5,000 submissions, and there's a one-time $59 3-year plan (15,000 submissions/mo for 36 months). The same pricing applies regardless of which framework hosts the form.

03Can I customize the fields?

Yes. The template ships with sensible defaults (your name, email, will you attend?, how many guests are you bringing?…) — add, remove, or rename any of them. Splitforms accepts whatever fields you POST.

04How does spam protection work on the event rsvp?

A hidden honeypot field catches dumb bots, and a tuned classifier scores the rest. You only see real submissions in your dashboard. No CAPTCHA, no friction for human users — and it works the same on AJAX (vanilla JS) as on any other framework.

05Can I send the event rsvp submissions to Slack or Discord?

Yes. Webhooks are available on Starter and above, with auto-formatted payloads for Slack, Discord, and WhatsApp (via CallMeBot). Or send raw signed JSON to any URL — Zapier, n8n, your own server. Configure in the splitforms dashboard.

06Will it work on a static AJAX (vanilla JS) site?

Yes — the form posts directly to splitforms from the browser, so no server is involved. Works on Vercel, Netlify, GitHub Pages, Cloudflare Pages, S3, or any plain Apache host.

07Why not just use Eventbrite or Splash?

For free events, both charge subscription fees ($30-100/mo for white-label) plus per-ticket fees. The form costs $0, lives on your own domain (which matters for weddings and brand events), and the data is yours — not licensed inside their platform.

08Can I send a calendar invite (.ics) automatically?

Yes — generate an .ics file and attach to the auto-responder. Webhook to a Zapier / Make automation that crafts the .ics with event title, date, location, and notes. Most email clients render the attachment as 'add to calendar' inline.

09How do I handle plus-ones?

Add 'plus-one yes/no' and a name field that appears conditionally. For weddings, the 'plus-one allowed' is invitation-specific — capture invitation code on the form, and the webhook validates whether that invite includes a plus-one before accepting the second name.

§ 07Comparisonvs Web3Forms · vs Formspree

splitforms vs everything else.

Same drop-in API. More free submissions, Starter signed webhooks, MCP support no other backend has.

Feature	Web3Forms	Formspree	splitforms
Free monthly submissions	250	50	500
Custom fields beyond contact	Yes	Pro tier	Free
Webhooks (Slack / Discord)	Pro tier	Pro tier	Free, signed
AI / MCP submission inbox	No	No	Yes
Long-term plan (3-year flat)	—	—	$59 every 3 years

§ 08More templates for AJAX (vanilla JS)0 adjacent patterns

Ship a event rsvp on AJAX (vanilla JS) in 60 seconds.

500 submissions per month, free forever. No credit card. Copy the snippet above and paste it into your AJAX (vanilla JS) project.

Get free access key →Read the docs

founders pricing locked in · early access open

Event RSVP for AJAX (vanilla JS)

Why AJAX (vanilla JS) developers choose splitforms for event rsvp

Yes — this is the shortest safe path for AJAX (vanilla JS).

Paste the HTML version, then replace YOUR_ACCESS_KEY.

Built for AJAX (vanilla JS) developers who hate operating a backend.

Drop into any AJAX (vanilla JS) project.

Generate, embed, receive.

Generate a free splitforms key

Paste the event rsvp into your AJAX (vanilla JS) project

Receive submissions

The reason this event rsvp exists.

Capture attendance and party

Update the running list

Confirm via email

What changes when this event rsvp lives in AJAX (vanilla JS).

Forgetting e.preventDefault() reloads the page

FormData includes ALL form fields — even disabled ones get dropped

fetch() doesn't reject on HTTP 4xx/5xx — only network errors

Double-click submit fires two requests

Pattern A — fetch + FormData + status element

Pattern B — progressive enhancement (works without JS)

What every field actually does.

Your name

Email

Will you attend?

How many guests are you bringing?

Dietary preferences

One backend. Every framework.

Event RSVP on AJAX (vanilla JS) — FAQ.

splitforms vs everything else.

Other ready-to-ship AJAX (vanilla JS) forms.

Ship a event rsvp on AJAX (vanilla JS) in 60 seconds.