Netlify Forms の上限：100 件を超えると何が起きるか、そして抜け出し方

"use client";

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

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

export function ContactForm() {
  const [state, setState] = useState<"idle" | "sending" | "sent">("idle");
  const [error, setError] = useState("");

  async function onSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    setState("sending");
    setError("");
    try {
      const response = await fetch(ENDPOINT, {
        method: "POST",
        headers: { Accept: "application/json" },
        body: new FormData(event.currentTarget),
      });
      const result = await response.json();
      if (result.ok) return setState("sent");
      setError(result.error.fields?.message?.[0] ?? result.error.fields?.email?.[0] ?? result.error.message);
    } catch {
      setError("Couldn't send. Check your connection and try again.");
    }
    setState("idle");
  }

  if (state === "sent") return <p role="status">Thanks. We read every message and reply within a day.</p>;

  return (
    <form action={ENDPOINT} method="post" onSubmit={onSubmit}>
      <input name="bot-field" type="text" tabIndex={-1} autoComplete="off" hidden />
      <label htmlFor="email">Email</label>
      <input id="email" name="email" type="email" required />
      <label htmlFor="topic">Topic</label>
      <select id="topic" name="topic" defaultValue="question">
        <option value="question">A question</option>
        <option value="bug">Something is broken</option>
        <option value="work">Working together</option>
      </select>
      <label htmlFor="message">Message</label>
      <textarea id="message" name="message" required />
      {error ? <p role="alert">{error}</p> : null}
      <button disabled={state === "sending"}>{state === "sending" ? "Sending" : "Send"}</button>
    </form>
  );
}

---
const endpoint = "https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx";
const thanksUrl = new URL("/thanks", Astro.site).href;
---

<form method="post" action={endpoint}>
  <input name="bot-field" type="text" tabindex="-1" autocomplete="off" hidden />
  <label for="email">Email</label>
  <input id="email" name="email" type="email" required />
  <label for="topic">Topic</label>
  <select id="topic" name="topic">
    <option value="question">A question</option>
    <option value="bug">Something is broken</option>
    <option value="work">Working together</option>
  </select>
  <label for="message">Message</label>
  <textarea id="message" name="message" required></textarea>
  <input type="hidden" name="_redirect" value={thanksUrl} />
  <button>Send</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 sendMessage = createServerFn({ method: "POST" })
  .validator((data: unknown) => {
    if (!(data instanceof FormData)) throw new Error("Expected form data");
    return {
      email: String(data.get("email") ?? "").trim(),
      topic: String(data.get("topic") ?? "question"),
      message: String(data.get("message") ?? "").trim(),
      "bot-field": String(data.get("bot-field") ?? ""),
    };
  })
  .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();
    return result.ok ? { sent: true, error: "" } : { sent: false, error: String(result.error.message) };
  });

export const Route = createFileRoute("/contact")({ component: Contact });

function Contact() {
  const send = useServerFn(sendMessage);
  const [state, setState] = useState({ sent: false, error: "" });
  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 {
      setState({ sent: false, error: "Couldn't send. Try again." });
    } finally {
      setPending(false);
    }
  }

  if (state.sent) return <p role="status">Thanks. We read every message and reply within a day.</p>;

  return (
    <form method="post" onSubmit={onSubmit}>
      <input name="bot-field" type="text" tabIndex={-1} autoComplete="off" hidden />
      <label htmlFor="email">Email</label>
      <input id="email" name="email" type="email" required />
      <label htmlFor="topic">Topic</label>
      <select id="topic" name="topic" defaultValue="question">
        <option value="question">A question</option>
        <option value="bug">Something is broken</option>
        <option value="work">Working together</option>
      </select>
      <label htmlFor="message">Message</label>
      <textarea id="message" name="message" required />
      {state.error ? <p role="alert">{state.error}</p> : null}
      <button disabled={pending}>{pending ? "Sending" : "Send"}</button>
    </form>
  );
}

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

export async function action({ request }: Route.ActionArgs) {
  const form = await request.formData();
  const origin = request.headers.get("origin");
  const response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
    method: "POST",
    headers: {
      Accept: "application/json",
      Authorization: `Bearer ${process.env.IKIFORM_SECRET_KEY}`,
      ...(origin ? { Origin: origin } : {}),
    },
    body: form,
  });
  const result = await response.json();
  if (result.ok) return { sent: true, error: "" };
  return data({ sent: false, error: String(result.error.message) }, { status: response.status });
}

export default function Contact({ actionData }: Route.ComponentProps) {
  const sending = useNavigation().state === "submitting";
  if (actionData?.sent) return <p role="status">Thanks. We read every message and reply within a day.</p>;

  return (
    <Form method="post">
      <input name="bot-field" type="text" tabIndex={-1} autoComplete="off" hidden />
      <label htmlFor="email">Email</label>
      <input id="email" name="email" type="email" required />
      <label htmlFor="topic">Topic</label>
      <select id="topic" name="topic" defaultValue="question">
        <option value="question">A question</option>
        <option value="bug">Something is broken</option>
        <option value="work">Working together</option>
      </select>
      <label htmlFor="message">Message</label>
      <textarea id="message" name="message" required />
      {actionData?.error ? <p role="alert">{actionData.error}</p> : null}
      <button disabled={sending}>{sending ? "Sending" : "Send"}</button>
    </Form>
  );
}

<script lang="ts">
  const ENDPOINT = "https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx";

  let sent = $state(false);
  let sending = $state(false);
  let error = $state("");

  async function send(event: SubmitEvent) {
    event.preventDefault();
    sending = true;
    error = "";
    try {
      const response = await fetch(ENDPOINT, {
        method: "POST",
        headers: { Accept: "application/json" },
        body: new FormData(event.currentTarget as HTMLFormElement),
      });
      const result = await response.json();
      if (result.ok) sent = true;
      else error = result.error.message;
    } catch {
      error = "Couldn't send. Check your connection and try again.";
    }
    sending = false;
  }
</script>

{#if sent}
  <p role="status">Thanks. We read every message and reply within a day.</p>
{:else}
  <form method="post" action={ENDPOINT} onsubmit={send}>
    <input name="bot-field" type="text" tabindex="-1" autocomplete="off" hidden />
    <label for="email">Email</label>
    <input id="email" name="email" type="email" required />
    <label for="topic">Topic</label>
    <select id="topic" name="topic">
      <option value="question">A question</option>
      <option value="bug">Something is broken</option>
      <option value="work">Working together</option>
    </select>
    <label for="message">Message</label>
    <textarea id="message" name="message" required></textarea>
    {#if error}<p role="alert">{error}</p>{/if}
    <button disabled={sending}>{sending ? "Sending" : "Send"}</button>
  </form>
{/if}

<script setup lang="ts">
const ENDPOINT = "https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx";
const sent = ref(false);
const sending = ref(false);
const error = ref("");

async function send(event: Event) {
  sending.value = true;
  error.value = "";
  try {
    await $fetch(ENDPOINT, {
      method: "POST",
      headers: { Accept: "application/json" },
      body: new FormData(event.target as HTMLFormElement),
    });
    sent.value = true;
  } catch (failure) {
    const data = (failure as { data?: { error?: { message?: string } } }).data;
    error.value = data?.error?.message ?? "Couldn't send. Check your connection and try again.";
  } finally {
    sending.value = false;
  }
}
</script>

<template>
  <p v-if="sent" role="status">Thanks. We read every message and reply within a day.</p>
  <form v-else :action="ENDPOINT" method="post" @submit.prevent="send">
    <input name="bot-field" type="text" tabindex="-1" autocomplete="off" hidden />
    <label for="email">Email</label>
    <input id="email" name="email" type="email" required />
    <label for="topic">Topic</label>
    <select id="topic" name="topic">
      <option value="question">A question</option>
      <option value="bug">Something is broken</option>
      <option value="work">Working together</option>
    </select>
    <label for="message">Message</label>
    <textarea id="message" name="message" required></textarea>
    <p v-if="error" role="alert">{{ error }}</p>
    <button :disabled="sending">{{ sending ? "Sending" : "Send" }}</button>
  </form>
</template>

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

const ENDPOINT = "https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx";
const state = ref<"idle" | "sending" | "sent">("idle");
const error = ref("");

async function send(event: Event) {
  state.value = "sending";
  error.value = "";
  try {
    const response = await fetch(ENDPOINT, {
      method: "POST",
      headers: { Accept: "application/json" },
      body: new FormData(event.target as HTMLFormElement),
    });
    const result = await response.json();
    if (result.ok) {
      state.value = "sent";
      return;
    }
    error.value = result.error.message;
  } catch {
    error.value = "Couldn't send. Check your connection and try again.";
  }
  state.value = "idle";
}
</script>

<template>
  <p v-if="state === 'sent'" role="status">Thanks. We read every message and reply within a day.</p>
  <form v-else :action="ENDPOINT" method="post" @submit.prevent="send">
    <input name="bot-field" type="text" tabindex="-1" autocomplete="off" hidden />
    <label for="email">Email</label>
    <input id="email" name="email" type="email" required />
    <label for="topic">Topic</label>
    <select id="topic" name="topic">
      <option value="question">A question</option>
      <option value="bug">Something is broken</option>
      <option value="work">Working together</option>
    </select>
    <label for="message">Message</label>
    <textarea id="message" name="message" required></textarea>
    <p v-if="error" role="alert">{{ error }}</p>
    <button :disabled="state === 'sending'">{{ state === "sending" ? "Sending" : "Send" }}</button>
  </form>
</template>