Mailchimp の埋め込みを使わないニュースレター登録フォーム

<form id="newsletter" action="https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx" method="post">
  <label for="nl-email">Email</label>
  <input id="nl-email" name="email" type="email" required autocomplete="email" placeholder="you@example.com" />

  <label for="nl-name">First name (optional)</label>
  <input id="nl-name" name="first_name" type="text" maxlength="80" autocomplete="given-name" />

  <label>
    <input name="consent" type="checkbox" value="true" required />
    Email me the newsletter. I can unsubscribe at any time.
  </label>

  <input type="hidden" name="source" value="footer" />
  <input type="hidden" name="_redirect" value="https://example.com/subscribed" />
  <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />

  <button>Subscribe</button>
  <p id="nl-status" role="status" hidden></p>
</form>

const form = document.querySelector("#newsletter");
const status = document.querySelector("#nl-status");
const button = form.querySelector("button");

form.addEventListener("submit", async (event) => {
  event.preventDefault();
  const body = new FormData(form);
  button.disabled = true;
  status.hidden = false;
  status.textContent = "Subscribing";
  try {
    const response = await fetch(form.action, { method: "POST", headers: { Accept: "application/json" }, body });
    const result = await response.json();
    if (result.ok) {
      form.replaceChildren(status);
      status.textContent = "Almost done. Open the email we sent you and confirm your address.";
      return;
    }
    const fields = result.error.fields ?? {};
    status.textContent = fields.email?.[0] ?? fields.consent?.[0] ?? result.error.message;
  } catch {
    status.textContent = "Couldn't reach the server. Try again.";
  }
  button.disabled = false;
});

"use server";

import { headers } from "next/headers";

export interface SignupState {
  done: boolean;
  errors: { email?: string; consent?: string; form?: string };
  email: string;
}

export async function subscribe(_previous: SignupState, formData: FormData): Promise<SignupState> {
  const email = String(formData.get("email") ?? "").trim();
  const consent = formData.get("consent") === "true";
  if (!consent) return { done: false, errors: { consent: "Tick the box so we know you want the emails." }, email };

  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: (await headers()).get("origin") ?? "",
    },
    body: JSON.stringify({
      email,
      first_name: String(formData.get("first_name") ?? "").trim() || undefined,
      consent,
      source: String(formData.get("source") ?? "footer"),
      _gotcha: String(formData.get("_gotcha") ?? ""),
    }),
  });
  const result = await response.json().catch(() => null);
  if (result?.ok) return { done: true, errors: {}, email };
  const fields = result?.error?.fields ?? {};
  return {
    done: false,
    errors: {
      email: fields.email?.[0],
      consent: fields.consent?.[0],
      form: fields.email || fields.consent ? undefined : (result?.error?.message ?? "Couldn't subscribe. Try again."),
    },
    email,
  };
}

"use client";

import { useActionState } from "react";
import { type SignupState, subscribe } from "./actions";

const initial: SignupState = { done: false, errors: {}, email: "" };

export function NewsletterForm({ source = "footer" }: { source?: string }) {
  const [state, action, pending] = useActionState(subscribe, initial);

  if (state.done) return <p role="status">Almost done. Open the email we sent you and confirm your address.</p>;

  return (
    <form action={action} noValidate>
      <label htmlFor="nl-email">Email</label>
      <input
        id="nl-email"
        name="email"
        type="email"
        required
        autoComplete="email"
        defaultValue={state.email}
        aria-invalid={Boolean(state.errors.email)}
        aria-describedby="nl-email-error"
      />
      <p id="nl-email-error">{state.errors.email}</p>
      <label htmlFor="nl-name">First name (optional)</label>
      <input id="nl-name" name="first_name" type="text" maxLength={80} autoComplete="given-name" />
      <label>
        <input name="consent" type="checkbox" value="true" aria-describedby="nl-consent-error" />
        Email me the newsletter. I can unsubscribe at any time.
      </label>
      <p id="nl-consent-error">{state.errors.consent}</p>
      <input type="hidden" name="source" value={source} />
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {state.errors.form ? <p role="alert">{state.errors.form}</p> : null}
      <button disabled={pending}>{pending ? "Subscribing" : "Subscribe"}</button>
    </form>
  );
}

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

export const server = {
  subscribe: defineAction({
    accept: "form",
    input: z.object({
      email: z.email(),
      first_name: z.string().max(80).nullish(),
      consent: z.boolean(),
      source: z.string().default("footer"),
      _gotcha: z.string().nullish(),
    }),
    handler: async (input, context) => {
      const origin = context.request.headers.get("origin");
      if (!input.consent) {
        throw new ActionError({ code: "BAD_REQUEST", message: "Tick the box so we know you want the emails." });
      }
      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({ ...input, first_name: input.first_name ?? undefined }),
      });
      const result = await response.json();
      if (!result.ok) {
        throw new ActionError({
          code: "BAD_REQUEST",
          message: result.error.fields?.email?.[0] ?? result.error.message,
        });
      }
      return { subscribed: true };
    },
  }),
};

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

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

{result?.data?.subscribed ? (
  <p role="status">Almost done. Open the email we sent you and confirm your address.</p>
) : (
  <form method="POST" action={actions.subscribe}>
    <label for="nl-email">Email</label>
    <input id="nl-email" name="email" type="email" required autocomplete="email" />
    {fields.email && <p>Enter a valid email address.</p>}
    <label for="nl-name">First name (optional)</label>
    <input id="nl-name" name="first_name" type="text" maxlength="80" />
    <label>
      <input name="consent" type="checkbox" required />
      Email me the newsletter. I can unsubscribe at any time.
    </label>
    <input type="hidden" name="source" value="footer" />
    <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    {result?.error && !isInputError(result.error) && <p role="alert">{result.error.message}</p>}
    <button>Subscribe</button>
  </form>
)}

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

type Errors = { email?: string; consent?: string; form?: string };

const subscribe = createServerFn({ method: "POST" })
  .validator((data: unknown) => {
    if (!(data instanceof FormData)) throw new Error("Expected form data");
    return {
      email: String(data.get("email") ?? "").trim(),
      first_name: String(data.get("first_name") ?? "").trim() || undefined,
      consent: data.get("consent") === "true",
      source: String(data.get("source") ?? "footer"),
      _gotcha: String(data.get("_gotcha") ?? ""),
    };
  })
  .handler(async ({ data }): Promise<{ ok: boolean; errors: Errors }> => {
    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 { ok: true, errors: {} };
    const fields = result.error.fields ?? {};
    return {
      ok: false,
      errors: { email: fields.email?.[0], consent: fields.consent?.[0], form: result.error.message },
    };
  });

export function NewsletterForm() {
  const send = useServerFn(subscribe);
  const [done, setDone] = useState(false);
  const [errors, setErrors] = useState<Errors>({});
  const [pending, setPending] = useState(false);

  async function onSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    setPending(true);
    try {
      const result = await send({ data: new FormData(event.currentTarget) });
      setDone(result.ok);
      setErrors(result.errors);
    } catch {
      setErrors({ form: "Couldn't subscribe. Try again." });
    } finally {
      setPending(false);
    }
  }

  if (done) return <p role="status">Almost done. Open the email we sent you and confirm your address.</p>;

  return (
    <form method="post" onSubmit={onSubmit}>
      <label htmlFor="nl-email">Email</label>
      <input id="nl-email" name="email" type="email" required autoComplete="email" />
      {errors.email ? <p>{errors.email}</p> : null}
      <label htmlFor="nl-name">First name (optional)</label>
      <input id="nl-name" name="first_name" type="text" maxLength={80} />
      <label>
        <input name="consent" type="checkbox" value="true" required />
        Email me the newsletter. I can unsubscribe at any time.
      </label>
      {errors.consent ? <p>{errors.consent}</p> : null}
      <input type="hidden" name="source" value="footer" />
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {errors.form && !errors.email && !errors.consent ? <p role="alert">{errors.form}</p> : null}
      <button disabled={pending}>{pending ? "Subscribing" : "Subscribe"}</button>
    </form>
  );
}

import { data } from "react-router";
import type { Route } from "./+types/newsletter";

export async function action({ request }: Route.ActionArgs) {
  const formData = await request.formData();
  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: request.headers.get("origin") ?? "",
    },
    body: JSON.stringify({
      email: String(formData.get("email") ?? "").trim(),
      first_name: String(formData.get("first_name") ?? "").trim() || undefined,
      consent: formData.get("consent") === "true",
      source: String(formData.get("source") ?? "footer"),
      _gotcha: String(formData.get("_gotcha") ?? ""),
    }),
  });
  const result = await response.json();
  if (result.ok) return { ok: true as const };
  return data(
    { ok: false as const, fields: (result.error.fields ?? {}) as Record<string, string[]>, message: String(result.error.message) },
    { status: response.status },
  );
}

import { type RouteConfig, index, route } from "@react-router/dev/routes";

export default [index("routes/home.tsx"), route("newsletter", "routes/newsletter.tsx")] satisfies RouteConfig;

import { useFetcher } from "react-router";
import type { action } from "~/routes/newsletter";

export function NewsletterForm() {
  const fetcher = useFetcher<typeof action>();
  const result = fetcher.data;
  const busy = fetcher.state !== "idle";

  if (result?.ok) return <p role="status">Almost done. Open the email we sent you and confirm your address.</p>;

  return (
    <fetcher.Form method="post" action="/newsletter">
      <label htmlFor="nl-email">Email</label>
      <input id="nl-email" name="email" type="email" required autoComplete="email" />
      {result?.fields.email ? <p>{result.fields.email[0]}</p> : null}
      <label htmlFor="nl-name">First name (optional)</label>
      <input id="nl-name" name="first_name" type="text" maxLength={80} />
      <label>
        <input name="consent" type="checkbox" value="true" required />
        Email me the newsletter. I can unsubscribe at any time.
      </label>
      {result?.fields.consent ? <p>{result.fields.consent[0]}</p> : null}
      <input type="hidden" name="source" value="footer" />
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {result && !result.fields.email && !result.fields.consent ? <p role="alert">{result.message}</p> : null}
      <button disabled={busy}>{busy ? "Subscribing" : "Subscribe"}</button>
    </fetcher.Form>
  );
}

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

export const actions = {
  subscribe: async ({ request, fetch, url }) => {
    const form = await request.formData();
    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({
        email: String(form.get("email") ?? "").trim(),
        first_name: String(form.get("first_name") ?? "").trim() || undefined,
        consent: form.get("consent") === "true",
        source: String(form.get("source") ?? "footer"),
        _gotcha: String(form.get("_gotcha") ?? ""),
      }),
    });
    const result = await response.json();
    if (!result.ok) {
      const fields = result.error.fields ?? {};
      return fail(response.status, { message: String(fields.email?.[0] ?? fields.consent?.[0] ?? result.error.message) });
    }
    return { subscribed: true };
  },
} satisfies Actions;

<script lang="ts">
  import { applyAction, enhance } from "$app/forms";

  let done = $state(false);
  let message = $state("");
  let pending = $state(false);
</script>

{#if done}
  <p role="status">Almost done. Open the email we sent you and confirm your address.</p>
{:else}
  <form
    method="POST"
    action="/newsletter?/subscribe"
    use:enhance={() => {
      pending = true;
      return async ({ result }) => {
        pending = false;
        if (result.type === "success") done = true;
        else if (result.type === "failure") message = String(result.data?.message ?? "Couldn't subscribe.");
        else await applyAction(result);
      };
    }}
  >
    <label for="nl-email">Email</label>
    <input id="nl-email" name="email" type="email" required autocomplete="email" />
    <label for="nl-name">First name (optional)</label>
    <input id="nl-name" name="first_name" type="text" maxlength="80" />
    <label>
      <input name="consent" type="checkbox" value="true" required />
      Email me the newsletter. I can unsubscribe at any time.
    </label>
    <input type="hidden" name="source" value="footer" />
    <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    {#if message}
      <p role="alert">{message}</p>
    {/if}
    <button disabled={pending}>{pending ? "Subscribing" : "Subscribe"}</button>
  </form>
{/if}

interface Signup {
  email?: string;
  first_name?: string;
  consent?: boolean;
  source?: string;
  _gotcha?: string;
}

export default defineEventHandler(async (event) => {
  const body = await readBody<Signup>(event);
  const config = useRuntimeConfig(event);
  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({
      email: body.email?.trim() ?? "",
      first_name: body.first_name?.trim() || undefined,
      consent: body.consent === true,
      source: body.source ?? "footer",
      _gotcha: body._gotcha ?? "",
    }),
  });
  const result = await response.json();
  if (!result.ok) {
    throw createError({
      status: response.status,
      message: String(result.error.message),
      data: { fields: result.error.fields ?? {} },
    });
  }
  return { subscribed: true };
});

<script setup lang="ts">
const email = ref("");
const firstName = ref("");
const consent = ref(false);
const trap = ref("");
const status = ref<"idle" | "sending" | "done">("idle");
const errors = ref<Record<string, string[]>>({});
const message = ref("");

async function subscribe() {
  status.value = "sending";
  errors.value = {};
  message.value = "";
  try {
    await $fetch("/api/newsletter", {
      method: "POST",
      body: { email: email.value, first_name: firstName.value, consent: consent.value, source: "footer", _gotcha: trap.value },
    });
    status.value = "done";
  } catch (failure) {
    const data = (failure as { data?: { message?: string; data?: { fields?: Record<string, string[]> } } }).data;
    errors.value = data?.data?.fields ?? {};
    message.value = data?.message ?? "Couldn't subscribe. Try again.";
    status.value = "idle";
  }
}
</script>

<template>
  <p v-if="status === 'done'" role="status">Almost done. Open the email we sent you and confirm your address.</p>
  <form v-else @submit.prevent="subscribe">
    <label for="nl-email">Email</label>
    <input id="nl-email" v-model="email" name="email" type="email" required autocomplete="email" />
    <p v-if="errors.email">{{ errors.email[0] }}</p>
    <label for="nl-name">First name (optional)</label>
    <input id="nl-name" v-model="firstName" name="first_name" type="text" maxlength="80" />
    <label>
      <input v-model="consent" name="consent" type="checkbox" required />
      Email me the newsletter. I can unsubscribe at any time.
    </label>
    <p v-if="errors.consent">{{ errors.consent[0] }}</p>
    <input v-model="trap" name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    <p v-if="message && !errors.email && !errors.consent" role="alert">{{ message }}</p>
    <button :disabled="status === 'sending'">{{ status === "sending" ? "Subscribing" : "Subscribe" }}</button>
  </form>
</template>

import { submit } from "@ikiform/sdk";
import { type FormEvent, useState } from "react";

type FieldErrors = Record<string, string[]>;

export function NewsletterForm() {
  const [done, setDone] = useState(false);
  const [errors, setErrors] = useState<FieldErrors>({});
  const [message, setMessage] = useState("");
  const [pending, setPending] = useState(false);

  async function onSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    setPending(true);
    setErrors({});
    setMessage("");
    const result = await submit("frm_xxxxxxxxxxxxxxxx", new FormData(event.currentTarget));
    setPending(false);
    if (result.ok) {
      setDone(true);
      return;
    }
    setErrors(result.error.fields ?? {});
    setMessage(result.error.message);
  }

  if (done) return <p role="status">Almost done. Open the email we sent you and confirm your address.</p>;

  return (
    <form action="https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx" method="post" onSubmit={onSubmit}>
      <label htmlFor="nl-email">Email</label>
      <input id="nl-email" name="email" type="email" required autoComplete="email" />
      {errors.email ? <p>{errors.email[0]}</p> : null}
      <label htmlFor="nl-name">First name (optional)</label>
      <input id="nl-name" name="first_name" type="text" maxLength={80} />
      <label>
        <input name="consent" type="checkbox" value="true" required />
        Email me the newsletter. I can unsubscribe at any time.
      </label>
      {errors.consent ? <p>{errors.consent[0]}</p> : null}
      <input type="hidden" name="source" value="footer" />
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {message && !errors.email && !errors.consent ? <p role="alert">{message}</p> : null}
      <button disabled={pending}>{pending ? "Subscribing" : "Subscribe"}</button>
    </form>
  );
}

<script setup lang="ts">
import { submit } from "@ikiform/sdk";
import { ref } from "vue";

const status = ref<"idle" | "sending" | "done">("idle");
const errors = ref<Record<string, string[]>>({});
const message = ref("");

async function subscribe(event: SubmitEvent) {
  status.value = "sending";
  const result = await submit("frm_xxxxxxxxxxxxxxxx", new FormData(event.target as HTMLFormElement));
  if (result.ok) {
    status.value = "done";
    return;
  }
  errors.value = result.error.fields ?? {};
  message.value = result.error.message;
  status.value = "idle";
}
</script>

<template>
  <p v-if="status === 'done'" role="status">Almost done. Open the email we sent you and confirm your address.</p>
  <form v-else action="https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx" method="post" @submit.prevent="subscribe">
    <label for="nl-email">Email</label>
    <input id="nl-email" name="email" type="email" required autocomplete="email" />
    <p v-if="errors.email">{{ errors.email[0] }}</p>
    <label for="nl-name">First name (optional)</label>
    <input id="nl-name" name="first_name" type="text" maxlength="80" />
    <label>
      <input name="consent" type="checkbox" value="true" required />
      Email me the newsletter. I can unsubscribe at any time.
    </label>
    <p v-if="errors.consent">{{ errors.consent[0] }}</p>
    <input type="hidden" name="source" value="footer" />
    <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
    <p v-if="message && !errors.email && !errors.consent" role="alert">{{ message }}</p>
    <button :disabled="status === 'sending'">{{ status === "sending" ? "Subscribing" : "Subscribe" }}</button>
  </form>
</template>