Form

TSX
"use client";

import * as React from "react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";

export default function Form01() {
  const [signedInAs, setSignedInAs] = React.useState<string | null>(null);

  return (
    <div className="w-full max-w-sm">
      <Form
        aria-labelledby="form-01-title"
        onFormSubmit={(values) => setSignedInAs(String(values.email))}
      >
        <div className="grid gap-1">
          <h2 id="form-01-title" className="text-lg font-semibold">
            Sign in to Ledgerly
          </h2>
          <p className="text-sm text-muted-foreground">
            Use the email your workspace admin invited.
          </p>
        </div>
        <FieldGroup className="gap-4">
          <Field name="email">
            <FieldLabel>Work email</FieldLabel>
            <Input
              required
              type="email"
              autoComplete="email"
              placeholder="dana@northwind.io"
            />
            <FieldError match="valueMissing">
              Enter the email you use for work.
            </FieldError>
            <FieldError match="typeMismatch">
              That doesn&apos;t look like an email address.
            </FieldError>
          </Field>
          <Field name="password">
            <div className="flex items-center justify-between gap-2">
              <FieldLabel>Password</FieldLabel>
              <a
                href="#reset-password"
                className="rounded-sm text-sm text-muted-foreground underline-offset-4 outline-none hover:text-foreground hover:underline focus-visible:ring-3 focus-visible:ring-ring/50"
              >
                Forgot password?
              </a>
            </div>
            <Input
              required
              type="password"
              minLength={8}
              autoComplete="current-password"
            />
            <FieldDescription>At least 8 characters.</FieldDescription>
            <FieldError match="valueMissing">Enter your password.</FieldError>
            <FieldError match="tooShort">
              Passwords are at least 8 characters long.
            </FieldError>
          </Field>
        </FieldGroup>
        <Button type="submit" className="w-full">
          Sign in
        </Button>
        <p
          role="status"
          className="min-h-5 text-center text-sm text-muted-foreground"
        >
          {signedInAs ? `Signed in as ${signedInAs}` : null}
        </p>
      </Form>
    </div>
  );
}

TSX
"use client";

import * as React from "react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";

type Mode = "onSubmit" | "onBlur" | "onChange";

const modes: { value: Mode; label: string; hint: string }[] = [
  {
    value: "onSubmit",
    label: "On submit",
    hint: "Errors appear after the first submit, then update as you type.",
  },
  {
    value: "onBlur",
    label: "On blur",
    hint: "Each field checks itself when you leave it.",
  },
  {
    value: "onChange",
    label: "On change",
    hint: "Fields check on every keystroke, debounced by 300 ms.",
  },
];

function validateHandle(value: unknown) {
  const handle = String(value ?? "");
  if (handle.length < 3) return "Use at least 3 characters.";
  if (!/^[a-z0-9_]+$/.test(handle)) {
    return "Only lowercase letters, numbers and underscores.";
  }
  return null;
}

export default function Form02() {
  const [mode, setMode] = React.useState<Mode>("onSubmit");
  const [claimed, setClaimed] = React.useState<string | null>(null);
  const active = modes.find((item) => item.value === mode) ?? modes[0];

  return (
    <div className="grid w-full max-w-sm gap-5">
      <div className="grid gap-2">
        <span id="form-02-mode" className="text-sm font-medium">
          Validate
        </span>
        <ToggleGroup
          aria-labelledby="form-02-mode"
          variant="outline"
          size="sm"
          spacing={0}
          value={[mode]}
          onValueChange={(value) => {
            const next = value[0] as Mode | undefined;
            if (next) {
              setMode(next);
              setClaimed(null);
            }
          }}
          className="w-full"
        >
          {modes.map((item) => (
            <ToggleGroupItem
              key={item.value}
              value={item.value}
              className="flex-1"
            >
              {item.label}
            </ToggleGroupItem>
          ))}
        </ToggleGroup>
        <p className="text-sm text-muted-foreground">{active.hint}</p>
      </div>
      <Form
        key={mode}
        validationMode={mode}
        aria-label="Claim your handle"
        className="rounded-xl border border-border bg-card p-5"
        onFormSubmit={(values) => setClaimed(String(values.handle))}
      >
        <FieldGroup className="gap-4">
          <Field
            name="handle"
            validate={validateHandle}
            validationDebounceTime={mode === "onChange" ? 300 : 0}
          >
            <FieldLabel>Handle</FieldLabel>
            <Input
              autoComplete="off"
              spellCheck={false}
              placeholder="dana_builds"
            />
            <FieldDescription>Your public profile address.</FieldDescription>
            <FieldError />
          </Field>
          <Field name="email">
            <FieldLabel>Email</FieldLabel>
            <Input
              required
              type="email"
              autoComplete="email"
              placeholder="dana@northwind.io"
            />
            <FieldError match="valueMissing">
              We need an email to confirm the handle.
            </FieldError>
            <FieldError match="typeMismatch">
              Enter an address like name@company.com.
            </FieldError>
          </Field>
        </FieldGroup>
        <Button type="submit">Claim handle</Button>
        <p role="status" className="min-h-5 text-sm text-muted-foreground">
          {claimed ? (
            <>
              <span className="font-medium text-foreground">@{claimed}</span>{" "}
              is yours.
            </>
          ) : null}
        </p>
      </Form>
    </div>
  );
}

TSX
"use client";

import * as React from "react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";

type Errors = Record<string, string | string[]>;

const takenUsernames = ["admin", "support", "dana"];
const breachedPasswords = ["password123", "qwerty2024", "letmein!"];

// Stands in for the response of a sign-up endpoint. A real server returns the
// same shape: messages keyed by field name, one string or a list per field.
function checkOnServer(values: Record<string, unknown>): Errors {
  const username = String(values.username ?? "").toLowerCase();
  const password = String(values.password ?? "");
  const errors: Errors = {};

  if (takenUsernames.includes(username)) {
    errors.username = `“${username}” is taken. Try ${username}-studio.`;
  }

  const passwordIssues: string[] = [];
  if (password.length < 12) passwordIssues.push("Use at least 12 characters.");
  if (!/\d/.test(password)) passwordIssues.push("Add at least one number.");
  if (breachedPasswords.includes(password.toLowerCase())) {
    passwordIssues.push("This password appeared in a known data breach.");
  }
  if (username && password.toLowerCase().includes(username)) {
    passwordIssues.push("Don't include your username.");
  }
  if (passwordIssues.length) errors.password = passwordIssues;

  return errors;
}

export default function Form03() {
  const [errors, setErrors] = React.useState<Errors>({});
  const [created, setCreated] = React.useState<string | null>(null);

  return (
    <div className="w-full max-w-sm">
      <Form
        aria-label="Create account"
        errors={errors}
        onFormSubmit={(values) => {
          const next = checkOnServer(values);
          setErrors(next);
          setCreated(
            Object.keys(next).length ? null : String(values.username ?? ""),
          );
        }}
      >
        <FieldGroup className="gap-4">
          <Field name="username">
            <FieldLabel>Username</FieldLabel>
            <Input defaultValue="admin" autoComplete="username" />
            <FieldError />
          </Field>
          <Field name="password">
            <FieldLabel>Password</FieldLabel>
            <Input
              type="password"
              defaultValue="password123"
              autoComplete="new-password"
            />
            <FieldDescription>
              Checked by the server when you submit.
            </FieldDescription>
            <FieldError className="[&_ul]:ml-4 [&_ul]:flex [&_ul]:list-disc [&_ul]:flex-col [&_ul]:gap-1" />
          </Field>
        </FieldGroup>
        <Button type="submit">Create account</Button>
        <p role="status" className="min-h-5 text-sm text-muted-foreground">
          {created ? `Account created for ${created}.` : null}
        </p>
      </Form>
    </div>
  );
}

TSX
"use client";

import * as React from "react";
import { CircleAlertIcon, CircleCheckIcon } from "lucide-react";

import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { Spinner } from "@/components/ui/spinner";

type Status = "idle" | "submitting" | "error" | "success";

export default function Form04() {
  const [status, setStatus] = React.useState<Status>("idle");
  const [email, setEmail] = React.useState("");
  const attempts = React.useRef(0);
  const timer = React.useRef<ReturnType<typeof setTimeout> | null>(null);

  React.useEffect(
    () => () => {
      if (timer.current) clearTimeout(timer.current);
    },
    [],
  );

  const submitting = status === "submitting";

  if (status === "success") {
    return (
      <div
        role="status"
        className="flex w-full max-w-sm animate-in flex-col items-center gap-3 rounded-xl border border-border bg-card p-6 text-center duration-300 fade-in-0 zoom-in-95 motion-reduce:animate-none"
      >
        <span className="flex size-10 items-center justify-center rounded-full bg-success/10">
          <CircleCheckIcon aria-hidden="true" className="size-5 text-success" />
        </span>
        <div className="grid gap-1">
          <h2 className="font-semibold">Check your inbox</h2>
          <p className="text-sm text-balance text-muted-foreground">
            We sent a confirmation link to{" "}
            <span className="font-medium text-foreground">{email}</span>. It
            expires in 24 hours.
          </p>
        </div>
        <Button
          variant="outline"
          size="sm"
          onClick={() => {
            attempts.current = 0;
            setEmail("");
            setStatus("idle");
          }}
        >
          Use a different email
        </Button>
      </div>
    );
  }

  return (
    <div className="w-full max-w-sm rounded-xl border border-border bg-card p-5">
      <Form
        aria-labelledby="form-04-title"
        aria-busy={submitting}
        onFormSubmit={(values) => {
          setEmail(String(values.email));
          setStatus("submitting");
          attempts.current += 1;
          // The first attempt fails so every state of the form is visible.
          const fails = attempts.current === 1;
          timer.current = setTimeout(() => {
            setStatus(fails ? "error" : "success");
          }, 1200);
        }}
      >
        <div className="grid gap-1">
          <h2 id="form-04-title" className="font-semibold">
            Get the release notes
          </h2>
          <p className="text-sm text-muted-foreground">
            One email per release. Unsubscribe anytime.
          </p>
        </div>
        {status === "error" ? (
          <Alert variant="destructive" className="animate-in fade-in-0 motion-reduce:animate-none">
            <CircleAlertIcon aria-hidden="true" />
            <AlertTitle>We couldn&apos;t reach the server</AlertTitle>
            <AlertDescription>
              Your details are still here. Check your connection and try again.
            </AlertDescription>
          </Alert>
        ) : null}
        <FieldGroup className="gap-4">
          <Field name="email" disabled={submitting}>
            <FieldLabel>Email</FieldLabel>
            <Input
              required
              type="email"
              autoComplete="email"
              placeholder="dana@northwind.io"
            />
            <FieldDescription>
              We&apos;ll send a link to confirm it&apos;s you.
            </FieldDescription>
            <FieldError match="valueMissing">
              Enter an email to subscribe.
            </FieldError>
            <FieldError match="typeMismatch">
              Enter an address like name@company.com.
            </FieldError>
          </Field>
        </FieldGroup>
        <Button type="submit" disabled={submitting}>
          {submitting ? (
            <>
              <Spinner aria-hidden="true" role="presentation" />
              Subscribing…
            </>
          ) : status === "error" ? (
            "Try again"
          ) : (
            "Subscribe"
          )}
        </Button>
        <span role="status" className="sr-only">
          {submitting ? "Subscribing" : ""}
        </span>
      </Form>
    </div>
  );
}

TSX
"use client";

import * as React from "react";
import { LockIcon, PencilIcon } from "lucide-react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";

type Contact = {
  name: string;
  relationship: string;
  phone: string;
  email: string;
};

const initialContact: Contact = {
  name: "Rosa Delgado",
  relationship: "Partner",
  phone: "+1 415 555 0132",
  email: "rosa.delgado@fastmail.com",
};

const fields: {
  name: keyof Contact;
  label: string;
  type?: string;
  autoComplete: string;
  required?: boolean;
}[] = [
  { name: "name", label: "Full name", autoComplete: "off", required: true },
  { name: "relationship", label: "Relationship", autoComplete: "off" },
  {
    name: "phone",
    label: "Phone",
    type: "tel",
    autoComplete: "off",
    required: true,
  },
  { name: "email", label: "Email", type: "email", autoComplete: "off" },
];

export default function Form05() {
  const [contact, setContact] = React.useState(initialContact);
  const [editing, setEditing] = React.useState(false);
  const [version, setVersion] = React.useState(0);
  const firstInput = React.useRef<HTMLInputElement>(null);
  const editButton = React.useRef<HTMLButtonElement>(null);
  const hasEdited = React.useRef(false);

  // Move focus into the form when editing starts and back to the Edit button
  // when it ends, so keyboard users never land on a removed element.
  React.useEffect(() => {
    if (editing) {
      hasEdited.current = true;
      firstInput.current?.focus();
    } else if (hasEdited.current) {
      editButton.current?.focus();
    }
  }, [editing]);

  function cancel() {
    // Remount the fields so they pick up the last saved values again.
    setVersion((current) => current + 1);
    setEditing(false);
  }

  return (
    <div className="w-full max-w-lg rounded-xl border border-border bg-card">
      <div className="flex items-start justify-between gap-3 border-b border-border p-5">
        <div className="grid gap-1">
          <h2 id="form-05-title" className="font-semibold">
            Emergency contact
          </h2>
          <p className="text-sm text-muted-foreground">
            Who we call if something happens at work. Visible to HR only.
          </p>
        </div>
        {editing ? null : (
          <Button
            ref={editButton}
            variant="outline"
            size="sm"
            onClick={() => setEditing(true)}
          >
            <PencilIcon aria-hidden="true" data-icon="inline-start" />
            Edit
          </Button>
        )}
      </div>
      <Form
        key={version}
        aria-labelledby="form-05-title"
        className="gap-5 p-5"
        onKeyDown={(event) => {
          if (event.key === "Escape" && editing) cancel();
        }}
        onFormSubmit={(values) => {
          setContact(values as Contact);
          // Remount so the read-only fields take the saved values as defaults.
          setVersion((current) => current + 1);
          setEditing(false);
        }}
      >
        <FieldGroup className="grid gap-4 sm:grid-cols-2">
          {fields.map((field, index) => (
            <Field key={field.name} name={field.name}>
              <FieldLabel>{field.label}</FieldLabel>
              <Input
                ref={index === 0 ? firstInput : undefined}
                type={field.type}
                required={field.required}
                readOnly={!editing}
                autoComplete={field.autoComplete}
                defaultValue={contact[field.name]}
                className="read-only:cursor-default read-only:border-transparent read-only:bg-muted/60 read-only:px-2.5 read-only:focus-visible:border-ring dark:read-only:bg-muted/40"
              />
              <FieldError match="valueMissing">
                {field.label} is required.
              </FieldError>
              <FieldError match="typeMismatch">
                Enter an address like name@company.com.
              </FieldError>
            </Field>
          ))}
        </FieldGroup>
        {editing ? (
          <div className="flex flex-col-reverse gap-2 sm:flex-row sm:justify-end">
            <Button type="button" variant="ghost" onClick={cancel}>
              Cancel
            </Button>
            <Button type="submit">Save contact</Button>
          </div>
        ) : (
          <p className="flex items-center gap-1.5 text-xs text-muted-foreground">
            <LockIcon aria-hidden="true" className="size-3.5" />
            Read-only. Select Edit to change these details.
          </p>
        )}
      </Form>
    </div>
  );
}

TSX
"use client";

import * as React from "react";
import { CircleAlertIcon, CircleCheckIcon } from "lucide-react";

import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
import { Button } from "@/components/ui/button";
import {
  Field,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";

type FieldName = "fullName" | "street" | "city" | "postcode" | "phone";

const fields: {
  name: FieldName;
  label: string;
  autoComplete: string;
  type?: string;
  span?: boolean;
}[] = [
  { name: "fullName", label: "Full name", autoComplete: "name", span: true },
  {
    name: "street",
    label: "Street address",
    autoComplete: "street-address",
    span: true,
  },
  { name: "city", label: "City", autoComplete: "address-level2" },
  { name: "postcode", label: "Postcode", autoComplete: "postal-code" },
  { name: "phone", label: "Phone", autoComplete: "tel", type: "tel", span: true },
];

function validate(values: Record<string, unknown>) {
  const value = (name: FieldName) => String(values[name] ?? "").trim();
  const errors: Partial<Record<FieldName, string>> = {};
  if (!value("fullName")) errors.fullName = "Enter the recipient's full name.";
  if (!value("street")) errors.street = "Enter a street and house number.";
  if (!value("city")) errors.city = "Enter a town or city.";
  if (!/^[A-Z0-9 ]{3,10}$/i.test(value("postcode"))) {
    errors.postcode = "Enter a postcode, like SW1A 1AA.";
  }
  if (value("phone").replace(/\D/g, "").length < 7) {
    errors.phone = "Enter a phone number the courier can call.";
  }
  return errors;
}

export default function Form06() {
  const idPrefix = React.useId();
  const [errors, setErrors] = React.useState<Partial<Record<FieldName, string>>>(
    {},
  );
  const [confirmed, setConfirmed] = React.useState(false);
  const entries = fields.filter((field) => errors[field.name]);

  function clear(name: FieldName) {
    setConfirmed(false);
    if (!errors[name]) return;
    setErrors((current) => {
      const next = { ...current };
      delete next[name];
      return next;
    });
  }

  return (
    <div className="w-full max-w-md">
      <Form
        aria-labelledby={`${idPrefix}-title`}
        errors={errors}
        onFormSubmit={(values) => {
          const next = validate(values);
          setErrors(next);
          setConfirmed(Object.keys(next).length === 0);
        }}
      >
        <h2 id={`${idPrefix}-title`} className="font-semibold">
          Shipping address
        </h2>
        {entries.length > 0 ? (
          <Alert variant="destructive" role="alert">
            <CircleAlertIcon aria-hidden="true" />
            <AlertTitle>
              Fix {entries.length}{" "}
              {entries.length === 1 ? "field" : "fields"} to continue
            </AlertTitle>
            <AlertDescription>
              <ul className="grid gap-1">
                {entries.map((field) => (
                  <li key={field.name}>
                    <button
                      type="button"
                      className="rounded-sm text-left underline underline-offset-4 outline-none hover:no-underline focus-visible:ring-3 focus-visible:ring-destructive/30"
                      onClick={() =>
                        document
                          .getElementById(`${idPrefix}-${field.name}`)
                          ?.focus()
                      }
                    >
                      {errors[field.name]}
                    </button>
                  </li>
                ))}
              </ul>
            </AlertDescription>
          </Alert>
        ) : null}
        <FieldGroup className="grid grid-cols-1 gap-4 sm:grid-cols-2">
          {fields.map((field) => (
            <Field
              key={field.name}
              name={field.name}
              className={field.span ? "sm:col-span-2" : undefined}
            >
              <FieldLabel>{field.label}</FieldLabel>
              <Input
                id={`${idPrefix}-${field.name}`}
                type={field.type}
                autoComplete={field.autoComplete}
                onChange={() => clear(field.name)}
              />
              <FieldError />
            </Field>
          ))}
        </FieldGroup>
        <Button type="submit">Continue to payment</Button>
        <p
          role="status"
          className="flex min-h-5 items-center gap-1.5 text-sm text-muted-foreground"
        >
          {confirmed ? (
            <>
              <CircleCheckIcon
                aria-hidden="true"
                className="size-4 text-success"
              />
              Address saved. Delivery estimate: 2–3 business days.
            </>
          ) : null}
        </p>
      </Form>
    </div>
  );
}

TSX
"use client";

import * as React from "react";
import { ArchiveRestoreIcon, TriangleAlertIcon } from "lucide-react";

import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";

const project = "acme-marketing-site";

const losses = [
  { label: "Deployments", value: "214" },
  { label: "Custom domains", value: "3" },
  { label: "Env variables", value: "18" },
];

export default function Form07() {
  const titleId = React.useId();
  const [typed, setTyped] = React.useState("");
  const [understood, setUnderstood] = React.useState(false);
  const [deleted, setDeleted] = React.useState(false);
  const matches = typed === project;

  if (deleted) {
    return (
      <div
        role="status"
        className="flex w-full max-w-md flex-col gap-4 rounded-xl border border-border bg-card p-5"
      >
        <div className="flex flex-col gap-1">
          <h2 className="font-semibold">{project} was deleted</h2>
          <p className="text-sm text-muted-foreground">
            Its domains are released now. You can restore the project and its
            deployments until October 25.
          </p>
        </div>
        <Button
          variant="outline"
          className="self-start"
          onClick={() => {
            setTyped("");
            setUnderstood(false);
            setDeleted(false);
          }}
        >
          <ArchiveRestoreIcon aria-hidden="true" data-icon="inline-start" />
          Restore project
        </Button>
      </div>
    );
  }

  return (
    <Form
      aria-labelledby={titleId}
      validationMode="onChange"
      className="w-full max-w-md gap-5 rounded-xl border border-destructive/30 bg-card p-5"
      onFormSubmit={() => {
        if (matches && understood) setDeleted(true);
      }}
    >
      <div className="flex items-start gap-3">
        <span className="flex size-9 shrink-0 items-center justify-center rounded-lg bg-destructive/10">
          <TriangleAlertIcon
            aria-hidden="true"
            className="size-4 text-destructive"
          />
        </span>
        <div className="flex flex-col gap-1">
          <h2 id={titleId} className="font-semibold">
            Delete project
          </h2>
          <p className="text-sm text-muted-foreground">
            This removes {project} for everyone on the Acme team.
          </p>
        </div>
      </div>

      <dl className="grid grid-cols-3 divide-x divide-border rounded-lg border border-border bg-muted/40 text-center">
        {losses.map((item) => (
          <div key={item.label} className="flex flex-col gap-0.5 px-2 py-3">
            <dt className="order-2 text-xs text-muted-foreground">
              {item.label}
            </dt>
            <dd className="order-1 text-lg font-semibold tabular-nums">
              {item.value}
            </dd>
          </div>
        ))}
      </dl>

      <FieldGroup className="gap-4">
        <Field
          name="confirmName"
          validate={(value) => {
            const text = String(value ?? "");
            if (!text || text === project) return null;
            return project.startsWith(text)
              ? null
              : "The name doesn't match. Check for typos.";
          }}
        >
          <FieldLabel>
            <span>
              Type <span className="font-mono">{project}</span> to confirm
            </span>
          </FieldLabel>
          <Input
            autoComplete="off"
            spellCheck={false}
            className="font-mono"
            value={typed}
            onChange={(event) => setTyped(event.target.value)}
          />
          <FieldError />
        </Field>

        <Field orientation="horizontal">
          <Checkbox
            checked={understood}
            onCheckedChange={(checked) => setUnderstood(checked)}
          />
          <FieldContent>
            <FieldLabel>I understand every deployment goes offline now</FieldLabel>
            <FieldDescription>
              You can restore it for 30 days. After that it&apos;s erased for good.
            </FieldDescription>
          </FieldContent>
        </Field>
      </FieldGroup>

      <div className="flex flex-col-reverse gap-2 sm:flex-row sm:justify-end">
        <Button
          type="button"
          variant="ghost"
          onClick={() => {
            setTyped("");
            setUnderstood(false);
          }}
        >
          Cancel
        </Button>
        <Button
          type="submit"
          variant="destructive"
          disabled={!matches || !understood}
        >
          Delete project
        </Button>
      </div>
    </Form>
  );
}

TSX
"use client";

import { useState } from "react";
import { EyeIcon, EyeOffIcon, ShieldCheckIcon } from "lucide-react";

import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupInput,
} from "@/components/ui/input-group";

// Stands in for the password the server has on file for this account.
const storedPassword = "correct-horse-42";
const otherSessions = 3;

function PasswordInput({
  label,
  autoComplete,
}: {
  label: string;
  autoComplete: string;
}) {
  const [visible, setVisible] = useState(false);

  return (
    <InputGroup>
      <InputGroupInput
        type={visible ? "text" : "password"}
        autoComplete={autoComplete}
        spellCheck={false}
      />
      <InputGroupAddon align="inline-end">
        <InputGroupButton
          size="icon-xs"
          aria-label={visible ? `Hide ${label}` : `Show ${label}`}
          aria-pressed={visible}
          onClick={() => setVisible((current) => !current)}
        >
          {visible ? (
            <EyeOffIcon aria-hidden="true" />
          ) : (
            <EyeIcon aria-hidden="true" />
          )}
        </InputGroupButton>
      </InputGroupAddon>
    </InputGroup>
  );
}

export default function Form08() {
  const [errors, setErrors] = useState<Record<string, string>>({});
  const [signOutOthers, setSignOutOthers] = useState(true);
  const [updatedAt, setUpdatedAt] = useState<string | null>(null);
  const [formKey, setFormKey] = useState(0);

  return (
    <div className="flex w-full max-w-md flex-col gap-3">
      {updatedAt ? (
        <div
          role="status"
          className="flex items-start gap-3 rounded-xl border border-success/30 bg-success/10 p-4 text-sm"
        >
          <ShieldCheckIcon
            aria-hidden="true"
            className="mt-0.5 size-4 shrink-0 text-success"
          />
          <p>
            Password updated at {updatedAt}.
            {signOutOthers
              ? ` ${otherSessions} other sessions were signed out.`
              : " Your other sessions stay signed in."}
          </p>
        </div>
      ) : null}

      <Form
        key={formKey}
        className="w-full gap-5 rounded-xl border border-border bg-card p-5"
        errors={errors}
        onFormSubmit={(values) => {
          if (values.currentPassword !== storedPassword) {
            setErrors({
              currentPassword:
                "That's not your current password. Try again or reset it by email.",
            });
            return;
          }
          setErrors({});
          setUpdatedAt(
            new Date().toLocaleTimeString("en-US", {
              hour: "numeric",
              minute: "2-digit",
            }),
          );
          // Remount the form to clear every field and its validation state.
          setFormKey((current) => current + 1);
        }}
      >
        <div className="flex flex-col gap-1">
          <h3 className="font-semibold">Change password</h3>
          <p className="text-sm text-muted-foreground">
            Last changed 94 days ago. New passwords need 12 characters.
          </p>
        </div>

        <FieldGroup className="gap-4">
          <Field
            name="currentPassword"
            validate={(value) =>
              String(value ?? "") ? null : "Enter your current password."
            }
          >
            <FieldLabel>Current password</FieldLabel>
            <PasswordInput
              label="current password"
              autoComplete="current-password"
            />
            <FieldDescription>
              The demo account uses{" "}
              <span className="font-mono whitespace-nowrap">{storedPassword}</span>.
            </FieldDescription>
            <FieldError />
          </Field>

          <Field
            name="newPassword"
            validate={(value, formValues) => {
              const next = String(value ?? "");
              if (next.length < 12) return "Use at least 12 characters.";
              if (next === formValues.currentPassword) {
                return "Choose a password you haven't used here before.";
              }
              return null;
            }}
          >
            <FieldLabel>New password</FieldLabel>
            <PasswordInput label="new password" autoComplete="new-password" />
            <FieldError />
          </Field>

          <Field
            name="confirmPassword"
            validate={(value, formValues) =>
              value === formValues.newPassword
                ? null
                : "Passwords don't match."
            }
          >
            <FieldLabel>Confirm new password</FieldLabel>
            <PasswordInput
              label="password confirmation"
              autoComplete="new-password"
            />
            <FieldError />
          </Field>

          <Field orientation="horizontal">
            <Checkbox
              checked={signOutOthers}
              onCheckedChange={(checked) => setSignOutOthers(checked)}
            />
            <FieldContent>
              <FieldLabel>Sign out of other devices</FieldLabel>
              <FieldDescription>
                Ends {otherSessions} active sessions on your phone, tablet, and
                work laptop.
              </FieldDescription>
            </FieldContent>
          </Field>
        </FieldGroup>

        <Button type="submit" className="sm:justify-self-end">
          Update password
        </Button>
      </Form>
    </div>
  );
}

TSX
"use client";

import { useId, useState } from "react";
import { PlaneIcon } from "lucide-react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
  FieldLegend,
  FieldSet,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { Switch } from "@/components/ui/switch";
import { Textarea } from "@/components/ui/textarea";

const audiences = [
  { value: "everyone", label: "Everyone who emails me" },
  { value: "internal", label: "Only people at Northwind" },
];

const defaultMessage =
  "Thanks for your message. I'm away until Monday, October 12 with limited access to email. For anything urgent, reach Daniel Park at daniel@northwind.co.";

function formatDay(value: string) {
  return new Date(`${value}T00:00:00`).toLocaleDateString("en-US", {
    weekday: "short",
    month: "short",
    day: "numeric",
  });
}

function dayCount(start: string, end: string) {
  const ms = Date.parse(`${end}T00:00:00`) - Date.parse(`${start}T00:00:00`);
  return Math.round(ms / 86_400_000) + 1;
}

export default function Form09() {
  const messageId = useId();
  const [enabled, setEnabled] = useState(true);
  const [start, setStart] = useState("2026-10-05");
  const [end, setEnd] = useState("2026-10-09");
  const [audience, setAudience] = useState("everyone");
  const [message, setMessage] = useState(defaultMessage);
  const [messageError, setMessageError] = useState(false);
  const [scheduled, setScheduled] = useState<string | null>(null);

  const validRange = Boolean(start && end) && end >= start;

  return (
    <Form
      className="w-full max-w-lg gap-5 rounded-xl border border-border bg-card p-5"
      onChange={() => setScheduled(null)}
      onFormSubmit={() => {
        if (enabled && !message.trim()) {
          setMessageError(true);
          return;
        }
        setScheduled(
          enabled
            ? `Auto-reply scheduled for ${formatDay(start)} to ${formatDay(end)}.`
            : "Auto-reply turned off.",
        );
      }}
    >
      <Field orientation="horizontal">
        <FieldContent>
          <FieldLabel className="text-base font-semibold">
            Out-of-office reply
          </FieldLabel>
          <FieldDescription>
            Answer incoming email automatically while you're away.
          </FieldDescription>
        </FieldContent>
        <Switch
          checked={enabled}
          onCheckedChange={(checked) => {
            setEnabled(checked);
            setScheduled(null);
          }}
        />
      </Field>

      {enabled ? (
        <FieldGroup className="gap-4">
          <div className="grid gap-4 sm:grid-cols-2">
            <Field name="start">
              <FieldLabel>First day away</FieldLabel>
              <Input
                required
                type="date"
                value={start}
                onChange={(event) => setStart(event.target.value)}
              />
              <FieldError />
            </Field>
            <Field
              name="end"
              validate={(value, formValues) =>
                String(value ?? "") >= String(formValues.start ?? "")
                  ? null
                  : "Pick a day on or after the first day."
              }
            >
              <FieldLabel>Last day away</FieldLabel>
              <Input
                required
                type="date"
                min={start}
                value={end}
                onChange={(event) => setEnd(event.target.value)}
              />
              <FieldError />
            </Field>
          </div>

          {validRange ? (
            <p className="flex items-center gap-2 rounded-lg bg-muted px-3 py-2 text-sm text-muted-foreground">
              <PlaneIcon aria-hidden="true" className="size-4 shrink-0" />
              <span>
                Away{" "}
                <span className="font-medium text-foreground">
                  {dayCount(start, end)}{" "}
                  {dayCount(start, end) === 1 ? "day" : "days"}
                </span>
                , back on the next working day.
              </span>
            </p>
          ) : null}

          <FieldSet>
            <FieldLegend variant="label">Send replies to</FieldLegend>
            <RadioGroup
              value={audience}
              onValueChange={(value) => setAudience(value as string)}
            >
              {audiences.map((option) => (
                <Label key={option.value} className="font-normal">
                  <RadioGroupItem value={option.value} />
                  {option.label}
                </Label>
              ))}
            </RadioGroup>
          </FieldSet>

          <Field invalid={messageError}>
            <FieldLabel htmlFor={messageId}>Message</FieldLabel>
            <Textarea
              id={messageId}
              rows={4}
              aria-invalid={messageError || undefined}
              value={message}
              onChange={(event) => {
                setMessage(event.target.value);
                setMessageError(false);
              }}
            />
            {messageError ? (
              <FieldError>Write a short message for people to read.</FieldError>
            ) : (
              <FieldDescription>
                Each sender gets this reply once per day.
              </FieldDescription>
            )}
          </Field>
        </FieldGroup>
      ) : null}

      <div className="flex flex-wrap items-center justify-end gap-3">
        {scheduled ? (
          <p role="status" className="mr-auto text-sm text-muted-foreground">
            {scheduled}
          </p>
        ) : null}
        <Button type="submit">Save</Button>
      </div>
    </Form>
  );
}

TSX
"use client";

import { useId, useState } from "react";
import { ReceiptTextIcon } from "lucide-react";

import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import {
  NativeSelect,
  NativeSelectOption,
} from "@/components/ui/native-select";

type CountryCode = "DE" | "FR" | "NL" | "US";

// Each billing country has its own tax ID name, format, and tax treatment.
const countries: Record<
  CountryCode,
  {
    label: string;
    taxLabel: string;
    placeholder: string;
    pattern: RegExp;
    hint: string;
    eu: boolean;
  }
> = {
  DE: {
    label: "Germany",
    taxLabel: "VAT number (USt-IdNr.)",
    placeholder: "DE123456789",
    pattern: /^DE\d{9}$/,
    hint: "DE followed by 9 digits.",
    eu: true,
  },
  FR: {
    label: "France",
    taxLabel: "VAT number (TVA)",
    placeholder: "FR12345678901",
    pattern: /^FR[A-Z0-9]{2}\d{9}$/,
    hint: "FR, 2 characters, then 9 digits.",
    eu: true,
  },
  NL: {
    label: "Netherlands",
    taxLabel: "VAT number (btw-id)",
    placeholder: "NL123456789B01",
    pattern: /^NL\d{9}B\d{2}$/,
    hint: "NL, 9 digits, B, then 2 digits.",
    eu: true,
  },
  US: {
    label: "United States",
    taxLabel: "EIN",
    placeholder: "12-3456789",
    pattern: /^\d{2}-\d{7}$/,
    hint: "9 digits in the format 12-3456789.",
    eu: false,
  },
};

// Stands in for the VIES registry lookup a server would run.
function lookupFails(taxId: string) {
  return /0{6}/.test(taxId);
}

export default function Form10() {
  const countryId = useId();
  const [country, setCountry] = useState<CountryCode>("DE");
  const [errors, setErrors] = useState<Record<string, string>>({});
  const [saved, setSaved] = useState<{
    company: string;
    taxId: string;
  } | null>(null);
  const config = countries[country];

  const treatment = !saved
    ? null
    : !config.eu
      ? "Sales tax is calculated from your billing address."
      : saved.taxId
        ? "Reverse charge applies. Invoices show 0% VAT."
        : "Standard VAT will be added to each invoice.";

  return (
    <Form
      className="w-full max-w-lg gap-5 rounded-xl border border-border bg-card p-5"
      errors={errors}
      onChange={() => setSaved(null)}
      onFormSubmit={(values) => {
        const taxId = String(values.taxId ?? "")
          .replace(/\s/g, "")
          .toUpperCase();
        if (taxId && config.eu && lookupFails(taxId)) {
          setErrors({
            taxId:
              "The EU VAT registry couldn't verify this number. Check it, or leave it empty to be charged VAT.",
          });
          return;
        }
        setErrors({});
        setSaved({ company: String(values.company ?? ""), taxId });
      }}
    >
      <div className="flex items-start gap-3">
        <span className="flex size-9 shrink-0 items-center justify-center rounded-lg bg-muted">
          <ReceiptTextIcon
            aria-hidden="true"
            className="size-4 text-muted-foreground"
          />
        </span>
        <div className="flex flex-col gap-1">
          <h3 className="font-semibold">Tax details</h3>
          <p className="text-sm text-muted-foreground">
            Printed on every invoice from your next billing date, October 1.
          </p>
        </div>
      </div>

      <FieldGroup className="gap-4">
        <Field name="company">
          <FieldLabel>Legal business name</FieldLabel>
          <Input
            required
            autoComplete="organization"
            defaultValue="Lindqvist Studio GmbH"
          />
          <FieldError />
        </Field>

        <div className="grid gap-4 sm:grid-cols-[minmax(0,2fr)_minmax(0,3fr)]">
          <Field>
            <FieldLabel htmlFor={countryId}>Country</FieldLabel>
            <NativeSelect
              id={countryId}
              className="w-full"
              autoComplete="country"
              value={country}
              onChange={(event) => {
                setCountry(event.target.value as CountryCode);
                setErrors({});
              }}
            >
              {(Object.keys(countries) as CountryCode[]).map((code) => (
                <NativeSelectOption key={code} value={code}>
                  {countries[code].label}
                </NativeSelectOption>
              ))}
            </NativeSelect>
          </Field>

          {/* Keyed by country so a stale format error doesn't carry over. */}
          <Field
            key={country}
            name="taxId"
            validate={(value) => {
              const taxId = String(value ?? "")
                .replace(/\s/g, "")
                .toUpperCase();
              if (!taxId) return null;
              return config.pattern.test(taxId) ? null : `Use ${config.hint}`;
            }}
          >
            <FieldLabel>
              {config.taxLabel}
              <span className="font-normal text-muted-foreground">
                Optional
              </span>
            </FieldLabel>
            <Input
              placeholder={config.placeholder}
              spellCheck={false}
              className="font-mono uppercase placeholder:font-sans placeholder:normal-case"
            />
            <FieldError />
          </Field>
        </div>

        <Field name="billingEmail">
          <FieldLabel>Invoice email</FieldLabel>
          <Input
            required
            type="email"
            autoComplete="email"
            defaultValue="finance@lindqvist.studio"
          />
          <FieldDescription>
            Receipts and payment failures go here, not to your login email.
          </FieldDescription>
          <FieldError />
        </Field>
      </FieldGroup>

      {saved ? (
        <div
          role="status"
          className="flex flex-col gap-2 rounded-lg border border-border bg-muted/50 p-3 text-sm"
        >
          <div className="flex flex-wrap items-center gap-2">
            <span className="font-medium">{saved.company}</span>
            {saved.taxId ? (
              <Badge variant="secondary" className="font-mono">
                {saved.taxId}
              </Badge>
            ) : null}
          </div>
          <p className="text-muted-foreground">{treatment}</p>
        </div>
      ) : null}

      <Button type="submit" className="sm:justify-self-end">
        Save tax details
      </Button>
    </Form>
  );
}

TSX
"use client";

import { useId, useState } from "react";
import { CalendarClockIcon, MailIcon } from "lucide-react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
  FieldLegend,
  FieldSet,
} from "@/components/ui/field";
import { Form } from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  NativeSelect,
  NativeSelectOption,
} from "@/components/ui/native-select";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";

type Frequency = "daily" | "weekly" | "monthly";

const frequencies: { value: Frequency; label: string }[] = [
  { value: "daily", label: "Daily" },
  { value: "weekly", label: "Weekly" },
  { value: "monthly", label: "Monthly" },
];

const weekdays = [
  "Sunday",
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday",
];

const formats = [
  { value: "pdf", label: "PDF summary", hint: "Charts and top-line numbers" },
  { value: "csv", label: "CSV export", hint: "Raw rows for spreadsheets" },
];

// A fixed "today" keeps the preview deterministic: Friday, September 25, 2026.
const today = new Date(2026, 8, 25);
const maxRecipients = 8;
const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

function nextDelivery(frequency: Frequency, weekday: number, time: string) {
  const [hours, minutes] = time.split(":").map(Number);
  const next = new Date(today);
  if (frequency === "daily") {
    next.setDate(next.getDate() + 1);
  } else if (frequency === "weekly") {
    const offset = (weekday - next.getDay() + 7) % 7 || 7;
    next.setDate(next.getDate() + offset);
  } else {
    next.setMonth(next.getMonth() + 1, 1);
  }
  next.setHours(hours || 0, minutes || 0);
  return next.toLocaleString("en-US", {
    weekday: "long",
    month: "long",
    day: "numeric",
    hour: "numeric",
    minute: "2-digit",
  });
}

function parseRecipients(value: unknown) {
  return String(value ?? "")
    .split(",")
    .map((entry) => entry.trim())
    .filter(Boolean);
}

export default function Form11() {
  const reportId = useId();
  const weekdayId = useId();
  const [frequency, setFrequency] = useState<Frequency>("weekly");
  const [weekday, setWeekday] = useState(1);
  const [time, setTime] = useState("09:00");
  const [format, setFormat] = useState("pdf");
  const [confirmation, setConfirmation] = useState<string | null>(null);

  return (
    <Form
      className="w-full max-w-lg gap-0 overflow-hidden rounded-xl border border-border bg-card"
      onChange={() => setConfirmation(null)}
      onFormSubmit={(values) => {
        const count = parseRecipients(values.recipients).length;
        setConfirmation(
          `Scheduled. ${count} ${count === 1 ? "person gets" : "people get"} the first report ${nextDelivery(frequency, weekday, time)}.`,
        );
      }}
    >
      <div className="flex flex-col gap-1 border-b border-border p-5">
        <h3 className="font-semibold">Schedule email delivery</h3>
        <p className="text-sm text-muted-foreground">
          Send a snapshot of this dashboard to your team on a regular cadence.
        </p>
      </div>

      <FieldGroup className="gap-5 p-5">
        <Field>
          <FieldLabel htmlFor={reportId}>Report</FieldLabel>
          <NativeSelect
            id={reportId}
            className="w-full"
            defaultValue="revenue"
          >
            <NativeSelectOption value="revenue">
              Revenue overview
            </NativeSelectOption>
            <NativeSelectOption value="retention">
              Cohort retention
            </NativeSelectOption>
            <NativeSelectOption value="funnel">
              Signup funnel
            </NativeSelectOption>
          </NativeSelect>
        </Field>

        <FieldSet>
          <FieldLegend variant="label">Frequency</FieldLegend>
          <ToggleGroup
            variant="outline"
            spacing={0}
            value={[frequency]}
            onValueChange={(value) => {
              const next = (value as Frequency[])[0];
              if (next) setFrequency(next);
              setConfirmation(null);
            }}
            className="w-full"
          >
            {frequencies.map((option) => (
              <ToggleGroupItem
                key={option.value}
                value={option.value}
                className="flex-1"
              >
                {option.label}
              </ToggleGroupItem>
            ))}
          </ToggleGroup>
        </FieldSet>

        <div className="grid gap-4 sm:grid-cols-2">
          {frequency === "weekly" ? (
            <Field>
              <FieldLabel htmlFor={weekdayId}>Day</FieldLabel>
              <NativeSelect
                id={weekdayId}
                className="w-full"
                value={weekday}
                onChange={(event) => setWeekday(Number(event.target.value))}
              >
                {weekdays.map((day, index) => (
                  <NativeSelectOption key={day} value={index}>
                    {day}
                  </NativeSelectOption>
                ))}
              </NativeSelect>
            </Field>
          ) : (
            <Field>
              <FieldLabel htmlFor={weekdayId}>Day</FieldLabel>
              <Input
                id={weekdayId}
                readOnly
                value={
                  frequency === "daily" ? "Every day" : "1st of the month"
                }
                className="text-muted-foreground"
              />
            </Field>
          )}
          <Field name="deliverAt">
            <FieldLabel>Time (CET)</FieldLabel>
            <Input
              required
              type="time"
              step={900}
              value={time}
              onChange={(event) => setTime(event.target.value)}
            />
            <FieldError />
          </Field>
        </div>

        <Field
          name="recipients"
          validate={(value) => {
            const list = parseRecipients(value);
            if (list.length === 0) return "Add at least one recipient.";
            const invalid = list.find((entry) => !emailPattern.test(entry));
            if (invalid) return `"${invalid}" isn't a valid email address.`;
            if (list.length > maxRecipients) {
              return `Scheduled reports go to ${maxRecipients} people at most.`;
            }
            return null;
          }}
        >
          <FieldLabel>Recipients</FieldLabel>
          <Input
            type="text"
            inputMode="email"
            spellCheck={false}
            defaultValue="lena@acme.io, tomas@acme.io"
          />
          <FieldDescription>
            Separate addresses with commas. People outside Acme get a view-only
            link.
          </FieldDescription>
          <FieldError />
        </Field>

        <FieldSet>
          <FieldLegend variant="label">Attachment</FieldLegend>
          <RadioGroup
            value={format}
            onValueChange={(value) => setFormat(value as string)}
            className="grid-cols-1 sm:grid-cols-2"
          >
            {formats.map((option) => (
              <Label
                key={option.value}
                className="items-start rounded-lg border border-border p-3 font-normal has-data-checked:border-primary/40 has-data-checked:bg-primary/5"
              >
                <RadioGroupItem value={option.value} className="mt-0.5" />
                <span className="flex flex-col gap-0.5">
                  <span className="font-medium">{option.label}</span>
                  <span className="text-xs text-muted-foreground">
                    {option.hint}
                  </span>
                </span>
              </Label>
            ))}
          </RadioGroup>
        </FieldSet>
      </FieldGroup>

      <div className="flex flex-col gap-3 border-t border-border bg-muted/40 px-5 py-3 sm:flex-row sm:items-center">
        <p
          role="status"
          className="flex items-start gap-2 text-sm text-muted-foreground sm:mr-auto"
        >
          {confirmation ? (
            <MailIcon aria-hidden="true" className="mt-0.5 size-4 shrink-0" />
          ) : (
            <CalendarClockIcon
              aria-hidden="true"
              className="mt-0.5 size-4 shrink-0"
            />
          )}
          <span>
            {confirmation ??
              `Next: ${nextDelivery(frequency, weekday, time)}`}
          </span>
        </p>
        <Button type="submit" className="shrink-0">
          Schedule report
        </Button>
      </div>
    </Form>
  );
}