Formularios de inscripción y RSVP para eventos en tu propio sitio

<form id="rsvp" action="https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx" method="post">
  <label for="name">Name</label>
  <input id="name" name="name" autocomplete="name" required maxlength="120">
  <label for="email">Email</label>
  <input id="email" name="email" type="email" autocomplete="email" required>
  <fieldset>
    <legend>Can you make it?</legend>
    <label><input type="radio" name="attending" value="yes" required> Yes</label>
    <label><input type="radio" name="attending" value="no"> No</label>
  </fieldset>
  <div id="if-going">
    <label for="guests">Guests you're bringing</label>
    <input id="guests" name="guests" type="number" min="0" max="3" step="1" value="0">
    <label for="dietary">Dietary needs</label>
    <select id="dietary" name="dietary">
      <option value="none">None</option>
      <option value="vegetarian">Vegetarian</option>
      <option value="vegan">Vegan</option>
      <option value="gluten_free">Gluten free</option>
      <option value="other">Other, tell us below</option>
    </select>
    <label for="access_needs">Access needs or anything else</label>
    <textarea id="access_needs" name="access_needs" rows="3" maxlength="1000"></textarea>
  </div>
  <input type="hidden" name="_redirect" value="https://example.com/meetup/registered">
  <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden>
  <button type="submit">Send RSVP</button>
</form>
<script>
  const rsvp = document.getElementById("rsvp");
  const extra = document.getElementById("if-going");
  rsvp.addEventListener("change", () => {
    const no = rsvp.elements.attending.value === "no";
    extra.hidden = no;
    if (no) rsvp.elements.guests.value = "0";
  });
</script>

"use server";

import { headers } from "next/headers";

export interface RsvpState {
  status: "idle" | "going" | "declined" | "error";
  message: string;
}

export async function sendRsvp(_previous: RsvpState, formData: FormData): Promise<RsvpState> {
  const attending = formData.get("attending") === "no" ? "no" : "yes";
  const origin = (await headers()).get("origin");
  const response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
    method: "POST",
    headers: {
      Accept: "application/json",
      "Content-Type": "application/json",
      Authorization: `Bearer ${process.env.IKIFORM_SECRET_KEY}`,
      ...(origin ? { Origin: origin } : {}),
    },
    body: JSON.stringify({
      name: String(formData.get("name") ?? "").trim(),
      email: String(formData.get("email") ?? "").trim(),
      attending,
      guests: attending === "yes" ? Number(formData.get("guests") || 0) : 0,
      dietary: String(formData.get("dietary") ?? "none"),
      access_needs: String(formData.get("access_needs") ?? ""),
      _gotcha: String(formData.get("_gotcha") ?? ""),
    }),
  });
  const result = await response.json().catch(() => null);
  if (result?.ok) {
    return attending === "yes"
      ? { status: "going", message: "You're registered. See you on 14 March at 6:30 pm." }
      : { status: "declined", message: "Thanks for letting us know. We'll miss you." };
  }
  const fields: Record<string, string[]> = result?.error?.fields ?? {};
  const [field, problems] = Object.entries(fields)[0] ?? [];
  return {
    status: "error",
    message: field ? `${field}: ${problems?.[0]}` : (result?.error?.message ?? "Couldn't save your RSVP. Try again."),
  };
}

"use client";

import { useActionState, useState } from "react";
import { type RsvpState, sendRsvp } from "./actions";

const initial: RsvpState = { status: "idle", message: "" };

export function RsvpForm() {
  const [state, action, pending] = useActionState(sendRsvp, initial);
  const [attending, setAttending] = useState("yes");

  if (state.status === "going" || state.status === "declined") return <p role="status">{state.message}</p>;

  return (
    <form action={action}>
      <label htmlFor="name">Name</label>
      <input id="name" name="name" autoComplete="name" required maxLength={120} />
      <label htmlFor="email">Email</label>
      <input id="email" name="email" type="email" autoComplete="email" required />
      <fieldset>
        <legend>Can you make it?</legend>
        <label>
          <input type="radio" name="attending" value="yes" defaultChecked onChange={() => setAttending("yes")} /> Yes
        </label>
        <label>
          <input type="radio" name="attending" value="no" onChange={() => setAttending("no")} /> No
        </label>
      </fieldset>
      {attending === "yes" ? (
        <>
          <label htmlFor="guests">Guests you're bringing</label>
          <input id="guests" name="guests" type="number" min={0} max={3} step={1} defaultValue={0} />
          <label htmlFor="dietary">Dietary needs</label>
          <select id="dietary" name="dietary" defaultValue="none">
            <option value="none">None</option>
            <option value="vegetarian">Vegetarian</option>
            <option value="vegan">Vegan</option>
            <option value="gluten_free">Gluten free</option>
            <option value="other">Other, tell us below</option>
          </select>
          <label htmlFor="access_needs">Access needs or anything else</label>
          <textarea id="access_needs" name="access_needs" rows={3} maxLength={1000} />
        </>
      ) : null}
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {state.status === "error" ? <p role="alert">{state.message}</p> : null}
      <button disabled={pending}>{pending ? "Sending" : "Send RSVP"}</button>
    </form>
  );
}

import { ActionError, defineAction } from "astro:actions";
import { getSecret } from "astro:env/server";
import { z } from "astro/zod";

export const server = {
  rsvp: defineAction({
    accept: "form",
    input: z.object({
      name: z.string().trim().min(1).max(120),
      email: z.email(),
      attending: z.enum(["yes", "no"]),
      guests: z.coerce.number().int().min(0).max(3).default(0),
      dietary: z.enum(["none", "vegetarian", "vegan", "gluten_free", "other"]).default("none"),
      access_needs: z.string().max(1000).default(""),
      _gotcha: z.string().nullish(),
    }),
    handler: async (input, context) => {
      const origin = context.request.headers.get("origin");
      const body = { ...input, guests: input.attending === "yes" ? input.guests : 0 };
      const response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
        method: "POST",
        headers: {
          Accept: "application/json",
          "Content-Type": "application/json",
          Authorization: `Bearer ${getSecret("IKIFORM_SECRET_KEY")}`,
          ...(origin ? { Origin: origin } : {}),
        },
        body: JSON.stringify(body),
      });
      const result = await response.json();
      if (!result.ok) throw new ActionError({ code: "BAD_REQUEST", message: result.error.message });
      return { attending: input.attending };
    },
  }),
};

---
import { actions, isInputError } from "astro:actions";

export const prerender = false;

const result = Astro.getActionResult(actions.rsvp);
const fieldErrors = result?.error && isInputError(result.error) ? result.error.fields : {};
---

{result?.data ? (
  <p role="status">{result.data.attending === "yes" ? "You're registered. See you on 14 March at 6:30 pm." : "Thanks for letting us know. We'll miss you."}</p>
) : (
  <form method="POST" action={actions.rsvp}>
    <label for="name">Name</label>
    <input id="name" name="name" autocomplete="name" required maxlength="120" />
    <label for="email">Email</label>
    <input id="email" name="email" type="email" autocomplete="email" required />
    <fieldset>
      <legend>Can you make it?</legend>
      <label><input type="radio" name="attending" value="yes" checked /> Yes</label>
      <label><input type="radio" name="attending" value="no" /> No</label>
    </fieldset>
    <label for="guests">Guests you're bringing</label>
    <input id="guests" name="guests" type="number" min="0" max="3" step="1" value="0" />
    {fieldErrors.guests && <p role="alert">{fieldErrors.guests.join(" ")}</p>}
    <label for="dietary">Dietary needs</label>
    <select id="dietary" name="dietary">
      <option value="none">None</option>
      <option value="vegetarian">Vegetarian</option>
      <option value="vegan">Vegan</option>
      <option value="gluten_free">Gluten free</option>
      <option value="other">Other, tell us below</option>
    </select>
    <label for="access_needs">Access needs or anything else</label>
    <textarea id="access_needs" name="access_needs" rows="3" maxlength="1000"></textarea>
    <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    {result?.error && !isInputError(result.error) && <p role="alert">{result.error.message}</p>}
    <button>Send RSVP</button>
  </form>
)}

import { createFileRoute } from "@tanstack/react-router";
import { createServerFn, useServerFn } from "@tanstack/react-start";
import { getRequestHeader } from "@tanstack/react-start/server";
import { type FormEvent, useState } from "react";

const sendRsvp = createServerFn({ method: "POST" })
  .validator((data: unknown) => {
    if (!(data instanceof FormData)) throw new Error("Expected form data");
    const attending = data.get("attending") === "no" ? "no" : "yes";
    const guests = attending === "yes" ? Number(data.get("guests") || 0) : 0;
    if (!Number.isInteger(guests) || guests < 0 || guests > 3) throw new Error("Bring up to 3 guests.");
    return {
      name: String(data.get("name") ?? "").trim(),
      email: String(data.get("email") ?? "").trim(),
      attending,
      guests,
      dietary: String(data.get("dietary") ?? "none"),
      access_needs: String(data.get("access_needs") ?? ""),
      _gotcha: String(data.get("_gotcha") ?? ""),
    };
  })
  .handler(async ({ data }) => {
    const origin = getRequestHeader("origin");
    const response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
      method: "POST",
      headers: {
        Accept: "application/json",
        "Content-Type": "application/json",
        Authorization: `Bearer ${process.env.IKIFORM_SECRET_KEY}`,
        ...(origin ? { Origin: origin } : {}),
      },
      body: JSON.stringify(data),
    });
    const result = await response.json();
    if (!result.ok) return { done: false, message: String(result.error.message) };
    return { done: true, message: data.attending === "yes" ? "You're registered. See you on 14 March at 6:30 pm." : "Thanks for letting us know. We'll miss you." };
  });

export const Route = createFileRoute("/rsvp")({ component: Rsvp });

function Rsvp() {
  const send = useServerFn(sendRsvp);
  const [attending, setAttending] = useState("yes");
  const [state, setState] = useState({ done: false, message: "" });
  const [pending, setPending] = useState(false);

  async function onSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    setPending(true);
    try {
      setState(await send({ data: new FormData(event.currentTarget) }));
    } catch (error) {
      setState({ done: false, message: error instanceof Error ? error.message : "Couldn't save your RSVP." });
    } finally {
      setPending(false);
    }
  }

  if (state.done) return <p role="status">{state.message}</p>;

  return (
    <form method="post" onSubmit={onSubmit}>
      <label htmlFor="name">Name</label>
      <input id="name" name="name" autoComplete="name" required maxLength={120} />
      <label htmlFor="email">Email</label>
      <input id="email" name="email" type="email" autoComplete="email" required />
      <fieldset>
        <legend>Can you make it?</legend>
        <label>
          <input type="radio" name="attending" value="yes" defaultChecked onChange={() => setAttending("yes")} /> Yes
        </label>
        <label>
          <input type="radio" name="attending" value="no" onChange={() => setAttending("no")} /> No
        </label>
      </fieldset>
      {attending === "yes" ? (
        <>
          <label htmlFor="guests">Guests you're bringing</label>
          <input id="guests" name="guests" type="number" min={0} max={3} step={1} defaultValue={0} />
          <label htmlFor="dietary">Dietary needs</label>
          <select id="dietary" name="dietary" defaultValue="none">
            <option value="none">None</option>
            <option value="vegetarian">Vegetarian</option>
            <option value="vegan">Vegan</option>
            <option value="gluten_free">Gluten free</option>
            <option value="other">Other, tell us below</option>
          </select>
          <label htmlFor="access_needs">Access needs or anything else</label>
          <textarea id="access_needs" name="access_needs" rows={3} maxLength={1000} />
        </>
      ) : null}
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {state.message ? <p role="alert">{state.message}</p> : null}
      <button disabled={pending}>{pending ? "Sending" : "Send RSVP"}</button>
    </form>
  );
}

import { data, Form, useNavigation } from "react-router";
import type { Route } from "./+types/rsvp";

export async function action({ request }: Route.ActionArgs) {
  const form = await request.formData();
  const attending = form.get("attending") === "no" ? "no" : "yes";
  const origin = request.headers.get("origin");
  const response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
    method: "POST",
    headers: {
      Accept: "application/json",
      "Content-Type": "application/json",
      Authorization: `Bearer ${process.env.IKIFORM_SECRET_KEY}`,
      ...(origin ? { Origin: origin } : {}),
    },
    body: JSON.stringify({
      name: String(form.get("name") ?? "").trim(),
      email: String(form.get("email") ?? "").trim(),
      attending,
      guests: attending === "yes" ? Number(form.get("guests") || 0) : 0,
      dietary: String(form.get("dietary") ?? "none"),
      access_needs: String(form.get("access_needs") ?? ""),
      _gotcha: String(form.get("_gotcha") ?? ""),
    }),
  });
  const result = await response.json();
  if (result.ok) return { attending, error: "" };
  const fields: Record<string, string[]> = result.error.fields ?? {};
  const first = Object.values(fields)[0]?.[0];
  return data({ attending: null, error: String(first ?? result.error.message) }, { status: response.status });
}

export default function Rsvp({ actionData }: Route.ComponentProps) {
  const sending = useNavigation().state === "submitting";
  if (actionData?.attending === "yes") return <p role="status">You're registered. See you on 14 March at 6:30 pm.</p>;
  if (actionData?.attending === "no") return <p role="status">Thanks for letting us know. We'll miss you.</p>;

  return (
    <Form method="post">
      <label htmlFor="name">Name</label>
      <input id="name" name="name" autoComplete="name" required maxLength={120} />
      <label htmlFor="email">Email</label>
      <input id="email" name="email" type="email" autoComplete="email" required />
      <fieldset>
        <legend>Can you make it?</legend>
        <label><input type="radio" name="attending" value="yes" defaultChecked /> Yes</label>
        <label><input type="radio" name="attending" value="no" /> No</label>
      </fieldset>
      <label htmlFor="guests">Guests you're bringing</label>
      <input id="guests" name="guests" type="number" min={0} max={3} step={1} defaultValue={0} />
      <label htmlFor="dietary">Dietary needs</label>
      <select id="dietary" name="dietary" defaultValue="none">
        <option value="none">None</option>
        <option value="vegetarian">Vegetarian</option>
        <option value="vegan">Vegan</option>
        <option value="gluten_free">Gluten free</option>
        <option value="other">Other, tell us below</option>
      </select>
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {actionData?.error ? <p role="alert">{actionData.error}</p> : null}
      <button disabled={sending}>{sending ? "Sending" : "Send RSVP"}</button>
    </Form>
  );
}

import { fail } from "@sveltejs/kit";
import { IKIFORM_SECRET_KEY } from "$app/env/private";
import type { Actions } from "./$types";

export const actions = {
  default: async ({ request, fetch, url }) => {
    const form = await request.formData();
    const attending = form.get("attending") === "no" ? "no" : "yes";
    const guests = attending === "yes" ? Number(form.get("guests") || 0) : 0;
    const name = String(form.get("name") ?? "").trim();
    const email = String(form.get("email") ?? "").trim();
    if (!Number.isInteger(guests) || guests < 0 || guests > 3) {
      return fail(400, { name, email, message: "You can bring up to 3 guests." });
    }

    const response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
      method: "POST",
      headers: {
        Accept: "application/json",
        "Content-Type": "application/json",
        Authorization: `Bearer ${IKIFORM_SECRET_KEY}`,
        Origin: request.headers.get("origin") ?? url.origin,
      },
      body: JSON.stringify({
        name,
        email,
        attending,
        guests,
        dietary: String(form.get("dietary") ?? "none"),
        access_needs: String(form.get("access_needs") ?? ""),
        _gotcha: String(form.get("_gotcha") ?? ""),
      }),
    });
    const result = await response.json();
    if (!result.ok) return fail(response.status, { name, email, message: String(result.error.message) });
    return { attending };
  },
} satisfies Actions;

<script lang="ts">
  import { enhance } from "$app/forms";
  import type { PageProps } from "./$types";

  let { form }: PageProps = $props();
  let attending = $state("yes");
</script>

{#if form?.attending === "yes"}
  <p role="status">You're registered. See you on 14 March at 6:30 pm.</p>
{:else if form?.attending === "no"}
  <p role="status">Thanks for letting us know. We'll miss you.</p>
{:else}
  <form method="POST" use:enhance>
    <label for="name">Name</label>
    <input id="name" name="name" autocomplete="name" required maxlength="120" value={form?.name ?? ""} />
    <label for="email">Email</label>
    <input id="email" name="email" type="email" autocomplete="email" required value={form?.email ?? ""} />
    <fieldset>
      <legend>Can you make it?</legend>
      <label><input type="radio" name="attending" value="yes" bind:group={attending} /> Yes</label>
      <label><input type="radio" name="attending" value="no" bind:group={attending} /> No</label>
    </fieldset>
    {#if attending === "yes"}
      <label for="guests">Guests you're bringing</label>
      <input id="guests" name="guests" type="number" min="0" max="3" step="1" value="0" />
      <label for="dietary">Dietary needs</label>
      <select id="dietary" name="dietary">
        <option value="none">None</option>
        <option value="vegetarian">Vegetarian</option>
        <option value="vegan">Vegan</option>
        <option value="gluten_free">Gluten free</option>
        <option value="other">Other, tell us below</option>
      </select>
    {/if}
    <label for="access_needs">Access needs or anything else</label>
    <textarea id="access_needs" name="access_needs" rows="3" maxlength="1000"></textarea>
    <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    {#if form?.message}<p role="alert">{form.message}</p>{/if}
    <button>Send RSVP</button>
  </form>
{/if}

interface RsvpBody {
  name?: string;
  email?: string;
  attending?: string;
  guests?: number;
  dietary?: string;
  _gotcha?: string;
}

export default defineEventHandler(async (event) => {
  const body = await readBody<RsvpBody>(event);
  const config = useRuntimeConfig(event);
  const attending = body.attending === "no" ? "no" : "yes";
  const origin = getRequestHeader(event, "origin");

  const response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
    method: "POST",
    headers: {
      Accept: "application/json",
      "Content-Type": "application/json",
      Authorization: `Bearer ${config.ikiformSecretKey}`,
      ...(origin ? { Origin: origin } : {}),
    },
    body: JSON.stringify({
      name: body.name?.trim() ?? "",
      email: body.email?.trim() ?? "",
      attending,
      guests: attending === "yes" ? Number(body.guests ?? 0) : 0,
      dietary: body.dietary ?? "none",
      _gotcha: body._gotcha ?? "",
    }),
  });
  const result = await response.json();
  if (!result.ok) {
    throw createError({
      status: response.status,
      message: String(result.error.message),
    });
  }
  return { attending };
});

<script setup lang="ts">
const rsvp = reactive({ name: "", email: "", attending: "yes", guests: 0, dietary: "none", _gotcha: "" });
const answer = ref<"yes" | "no" | null>(null);
const error = ref("");
const sending = ref(false);

async function send() {
  sending.value = true;
  error.value = "";
  try {
    const result = await $fetch<{ attending: "yes" | "no" }>("/api/rsvp", { method: "POST", body: rsvp });
    answer.value = result.attending;
  } catch (failure) {
    error.value = (failure as { data?: { message?: string } }).data?.message ?? "Couldn't save your RSVP.";
  }
  sending.value = false;
}
</script>

<template>
  <p v-if="answer === 'yes'" role="status">You're registered. See you on 14 March at 6:30 pm.</p>
  <p v-else-if="answer === 'no'" role="status">Thanks for letting us know. We'll miss you.</p>
  <form v-else @submit.prevent="send">
    <label for="name">Name</label>
    <input id="name" v-model="rsvp.name" autocomplete="name" required maxlength="120" />
    <label for="email">Email</label>
    <input id="email" v-model="rsvp.email" type="email" autocomplete="email" required />
    <fieldset>
      <legend>Can you make it?</legend>
      <label><input v-model="rsvp.attending" type="radio" value="yes" /> Yes</label>
      <label><input v-model="rsvp.attending" type="radio" value="no" /> No</label>
    </fieldset>
    <template v-if="rsvp.attending === 'yes'">
      <label for="guests">Guests you're bringing</label>
      <input id="guests" v-model.number="rsvp.guests" type="number" min="0" max="3" step="1" />
      <label for="dietary">Dietary needs</label>
      <select id="dietary" v-model="rsvp.dietary">
        <option value="none">None</option>
        <option value="vegetarian">Vegetarian</option>
        <option value="vegan">Vegan</option>
        <option value="gluten_free">Gluten free</option>
        <option value="other">Other</option>
      </select>
    </template>
    <input v-model="rsvp._gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    <p v-if="error" role="alert">{{ error }}</p>
    <button :disabled="sending">{{ sending ? "Sending" : "Send RSVP" }}</button>
  </form>
</template>

import { type FormEvent, useState } from "react";

const ENDPOINT = "https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx";

export function RsvpForm() {
  const [attending, setAttending] = useState("yes");
  const [answer, setAnswer] = useState<"yes" | "no" | null>(null);
  const [error, setError] = useState("");
  const [sending, setSending] = useState(false);

  async function onSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    const body = new FormData(event.currentTarget);
    if (body.get("attending") === "no") body.set("guests", "0");
    setSending(true);
    setError("");
    try {
      const response = await fetch(ENDPOINT, { method: "POST", headers: { Accept: "application/json" }, body });
      const result = await response.json();
      if (result.ok) setAnswer(body.get("attending") === "no" ? "no" : "yes");
      else setError(result.error.fields?.guests?.[0] ?? result.error.message);
    } catch {
      setError("Couldn't reach the server. Try again.");
    }
    setSending(false);
  }

  if (answer === "yes") return <p role="status">You're registered. See you on 14 March at 6:30 pm.</p>;
  if (answer === "no") return <p role="status">Thanks for letting us know. We'll miss you.</p>;

  return (
    <form action={ENDPOINT} method="post" onSubmit={onSubmit}>
      <label htmlFor="name">Name</label>
      <input id="name" name="name" autoComplete="name" required maxLength={120} />
      <label htmlFor="email">Email</label>
      <input id="email" name="email" type="email" autoComplete="email" required />
      <fieldset>
        <legend>Can you make it?</legend>
        <label>
          <input type="radio" name="attending" value="yes" defaultChecked onChange={() => setAttending("yes")} /> Yes
        </label>
        <label>
          <input type="radio" name="attending" value="no" onChange={() => setAttending("no")} /> No
        </label>
      </fieldset>
      <div hidden={attending === "no"}>
        <label htmlFor="guests">Guests you're bringing</label>
        <input id="guests" name="guests" type="number" min={0} max={3} step={1} defaultValue={0} />
        <label htmlFor="dietary">Dietary needs</label>
        <select id="dietary" name="dietary" defaultValue="none">
          <option value="none">None</option>
          <option value="vegetarian">Vegetarian</option>
          <option value="vegan">Vegan</option>
          <option value="gluten_free">Gluten free</option>
          <option value="other">Other</option>
        </select>
      </div>
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {error ? <p role="alert">{error}</p> : null}
      <button disabled={sending}>{sending ? "Sending" : "Send RSVP"}</button>
    </form>
  );
}

<script setup lang="ts">
import { ref } from "vue";

const ENDPOINT = "https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx";
const attending = ref("yes");
const answer = ref<"yes" | "no" | null>(null);
const error = ref("");
const sending = ref(false);

async function send(event: Event) {
  const body = new FormData(event.target as HTMLFormElement);
  if (attending.value === "no") body.set("guests", "0");
  sending.value = true;
  error.value = "";
  try {
    const response = await fetch(ENDPOINT, { method: "POST", headers: { Accept: "application/json" }, body });
    const result = await response.json();
    if (result.ok) answer.value = attending.value === "no" ? "no" : "yes";
    else error.value = result.error.fields?.guests?.[0] ?? result.error.message;
  } catch {
    error.value = "Couldn't reach the server. Try again.";
  }
  sending.value = false;
}
</script>

<template>
  <p v-if="answer === 'yes'" role="status">You're registered. See you on 14 March at 6:30 pm.</p>
  <p v-else-if="answer === 'no'" role="status">Thanks for letting us know. We'll miss you.</p>
  <form v-else :action="ENDPOINT" method="post" @submit.prevent="send">
    <label for="name">Name</label>
    <input id="name" name="name" autocomplete="name" required maxlength="120" />
    <label for="email">Email</label>
    <input id="email" name="email" type="email" autocomplete="email" required />
    <fieldset>
      <legend>Can you make it?</legend>
      <label><input v-model="attending" type="radio" name="attending" value="yes" /> Yes</label>
      <label><input v-model="attending" type="radio" name="attending" value="no" /> No</label>
    </fieldset>
    <div v-show="attending === 'yes'">
      <label for="guests">Guests you're bringing</label>
      <input id="guests" name="guests" type="number" min="0" max="3" step="1" value="0" />
      <label for="dietary">Dietary needs</label>
      <select id="dietary" name="dietary">
        <option value="none">None</option>
        <option value="vegetarian">Vegetarian</option>
        <option value="vegan">Vegan</option>
        <option value="gluten_free">Gluten free</option>
        <option value="other">Other</option>
      </select>
    </div>
    <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    <p v-if="error" role="alert">{{ error }}</p>
    <button :disabled="sending">{{ sending ? "Sending" : "Send RSVP" }}</button>
  </form>
</template>