Field

TSX
"use client";

import { useState } from "react";

import { Field, FieldDescription, FieldLabel } from "@/components/ui/field";
import { Input } from "@/components/ui/input";

const MAX_LENGTH = 40;

export default function Field01() {
  const [value, setValue] = useState("Northwind Studio");
  const remaining = MAX_LENGTH - value.length;

  return (
    <div className="w-full max-w-sm">
      <Field name="workspaceName">
        <div className="flex items-baseline justify-between gap-3">
          <FieldLabel>Workspace name</FieldLabel>
          <span className="text-xs text-muted-foreground">Optional</span>
        </div>
        <Input
          value={value}
          maxLength={MAX_LENGTH}
          placeholder="Acme Inc."
          onChange={(event) => setValue(event.target.value)}
        />
        <div className="flex items-start justify-between gap-3">
          <FieldDescription>
            Shown on invoices and in the sidebar switcher.
          </FieldDescription>
          <span
            aria-live="polite"
            className="shrink-0 text-xs text-muted-foreground tabular-nums"
          >
            {remaining} left
          </span>
        </div>
      </Field>
    </div>
  );
}

TSX
"use client";

import { useState } from "react";
import { CheckIcon } from "lucide-react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldGroup,
  FieldLabel,
  FieldSeparator,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";

// Fixed label column once the group is wide enough; stacked below that.
const labelColumn = "@md/field-group:flex-[0_0_11rem]";
const controlColumn = "@md/field-group:flex-1";

export default function Field02() {
  const [saved, setSaved] = useState(false);

  return (
    <form
      className="w-full max-w-2xl"
      onSubmit={(event) => {
        event.preventDefault();
        setSaved(true);
      }}
      onChange={() => setSaved(false)}
      onReset={() => setSaved(false)}
    >
      <FieldGroup>
        <Field name="fullName" orientation="responsive">
          <FieldContent className={labelColumn}>
            <FieldLabel>Full name</FieldLabel>
            <FieldDescription>As it appears on your ID.</FieldDescription>
          </FieldContent>
          <Input
            className={controlColumn}
            defaultValue="Priya Raman"
            autoComplete="name"
          />
        </Field>
        <FieldSeparator />
        <Field name="workEmail" orientation="responsive">
          <FieldContent className={labelColumn}>
            <FieldLabel>Work email</FieldLabel>
            <FieldDescription>Where approvals are sent.</FieldDescription>
          </FieldContent>
          <Input
            className={controlColumn}
            type="email"
            defaultValue="priya@lumen.dev"
            autoComplete="email"
          />
        </Field>
        <FieldSeparator />
        <Field name="bio" orientation="responsive">
          <FieldContent className={labelColumn}>
            <FieldLabel>Bio</FieldLabel>
            <FieldDescription>A line or two for your profile.</FieldDescription>
          </FieldContent>
          <Textarea
            className={controlColumn}
            defaultValue="Platform engineer. I keep the build green and the on-call rotation quiet."
          />
        </Field>
        <div className="flex flex-wrap items-center justify-end gap-2">
          {saved ? (
            <p
              role="status"
              className="mr-auto flex items-center gap-1.5 text-sm text-muted-foreground"
            >
              <CheckIcon aria-hidden="true" className="size-4 text-success" />
              Profile saved
            </p>
          ) : null}
          <Button type="reset" variant="ghost">
            Reset
          </Button>
          <Button type="submit">Save profile</Button>
        </div>
      </FieldGroup>
    </form>
  );
}

TSX
"use client";

import { CircleAlertIcon, CircleCheckIcon, LockIcon } from "lucide-react";

import {
  Field,
  FieldDescription,
  FieldError,
  FieldLabel,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import {
  InputGroup,
  InputGroupAddon,
  InputGroupInput,
} from "@/components/ui/input-group";

export default function Field03() {
  return (
    <div className="grid w-full max-w-2xl gap-x-6 gap-y-7 sm:grid-cols-2">
      <Field name="teamName">
        <FieldLabel>Team name</FieldLabel>
        <Input placeholder="Growth squad" />
        <FieldDescription>Ready for input.</FieldDescription>
      </Field>

      <Field name="accountId">
        <FieldLabel>Account ID</FieldLabel>
        <InputGroup className="bg-muted/50 dark:bg-muted/30">
          <InputGroupInput readOnly defaultValue="acct_9F2kQ71xLm" />
          <InputGroupAddon align="inline-end">
            <LockIcon aria-hidden="true" />
          </InputGroupAddon>
        </InputGroup>
        <FieldDescription>
          Read-only. You can select and copy it.
        </FieldDescription>
      </Field>

      <Field name="billingEmail" disabled>
        <FieldLabel>Billing email</FieldLabel>
        <Input type="email" defaultValue="finance@orbital.io" />
        <FieldDescription>
          Managed by your organization's admin.
        </FieldDescription>
      </Field>

      <Field name="subdomain" invalid>
        <FieldLabel>Subdomain</FieldLabel>
        <InputGroup>
          <InputGroupInput defaultValue="orbital app" />
          <InputGroupAddon align="inline-end">
            <CircleAlertIcon aria-hidden="true" className="text-destructive" />
          </InputGroupAddon>
        </InputGroup>
        <FieldError>
          Use lowercase letters, numbers, and hyphens only.
        </FieldError>
      </Field>

      <Field name="vatNumber" className="sm:col-span-2">
        <FieldLabel>VAT number</FieldLabel>
        <InputGroup className="border-success/60 has-[[data-slot=input-group-control]:focus-visible]:border-success has-[[data-slot=input-group-control]:focus-visible]:ring-success/25">
          <InputGroupInput defaultValue="DE 811 907 980" />
          <InputGroupAddon align="inline-end">
            <CircleCheckIcon aria-hidden="true" className="text-success" />
          </InputGroupAddon>
        </InputGroup>
        <FieldDescription>
          <span className="font-medium text-success">Verified.</span> Matches
          the EU VIES registry for Orbital GmbH.
        </FieldDescription>
      </Field>
    </div>
  );
}

TSX
"use client";

import { useId, useState } from "react";
import { CpuIcon, type LucideIcon, ServerIcon, ZapIcon } from "lucide-react";

import { Field, FieldDescription, FieldLabel } from "@/components/ui/field";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";

const machines: {
  value: string;
  title: string;
  description: string;
  price: string;
  icon: LucideIcon;
}[] = [
  {
    value: "shared",
    title: "Shared CPU",
    description: "1 vCPU, 1 GB RAM. Previews and side projects.",
    price: "$5/mo",
    icon: CpuIcon,
  },
  {
    value: "dedicated",
    title: "Dedicated CPU",
    description: "4 vCPU, 8 GB RAM. Steady production traffic.",
    price: "$48/mo",
    icon: ServerIcon,
  },
  {
    value: "performance",
    title: "Performance",
    description: "16 vCPU, 32 GB RAM. Builds, queues, and search.",
    price: "$190/mo",
    icon: ZapIcon,
  },
];

export default function Field04() {
  const id = useId();
  const [machine, setMachine] = useState("dedicated");

  return (
    <Field name="machineSize" className="w-full max-w-md">
      <FieldLabel>Machine size</FieldLabel>
      <FieldDescription>
        Resize at any time. Billing is prorated by the minute.
      </FieldDescription>
      <RadioGroup
        value={machine}
        onValueChange={(value) => setMachine(value as string)}
        className="mt-1 gap-2.5"
      >
        {machines.map((option) => (
          // biome-ignore lint/a11y/noLabelWithoutControl: RadioGroupItem renders the radio control inside this label.
          <label
            key={option.value}
            className="group/choice flex cursor-pointer items-center gap-3 rounded-lg border border-border p-3 transition-colors hover:bg-muted/50 has-data-checked:border-primary/30 has-data-checked:bg-primary/5 has-[:focus-visible]:border-ring has-[:focus-visible]:ring-3 has-[:focus-visible]:ring-ring/50 dark:has-data-checked:border-primary/20 dark:has-data-checked:bg-primary/10"
          >
            <span className="flex size-9 shrink-0 items-center justify-center rounded-lg border border-border bg-muted text-muted-foreground transition-colors group-has-data-checked/choice:border-transparent group-has-data-checked/choice:bg-primary group-has-data-checked/choice:text-primary-foreground">
              <option.icon aria-hidden="true" className="size-4" />
            </span>
            <span className="flex min-w-0 flex-1 flex-col gap-0.5">
              <span
                id={`${id}-${option.value}-title`}
                className="text-sm font-medium text-foreground"
              >
                {option.title}
              </span>
              <span
                id={`${id}-${option.value}-description`}
                className="text-xs text-muted-foreground"
              >
                {option.description}
              </span>
            </span>
            <span className="shrink-0 text-sm font-medium tabular-nums text-foreground">
              {option.price}
            </span>
            <RadioGroupItem
              value={option.value}
              aria-labelledby={`${id}-${option.value}-title`}
              aria-describedby={`${id}-${option.value}-description`}
            />
          </label>
        ))}
      </RadioGroup>
    </Field>
  );
}

TSX
"use client";

import { useState } from "react";

import { Badge } from "@/components/ui/badge";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldLabel,
  FieldLegend,
  FieldSet,
} from "@/components/ui/field";

const LIMIT = 3;

const widgets = [
  { id: "revenue", label: "Net revenue", hint: "Daily, in USD" },
  { id: "activeUsers", label: "Active users", hint: "Rolling 7 days" },
  { id: "churn", label: "Churn rate", hint: "Monthly cohort" },
  { id: "supportQueue", label: "Support queue", hint: "Open tickets" },
  { id: "deploys", label: "Deploy frequency", hint: "Per service" },
  { id: "errorBudget", label: "Error budget", hint: "SLO remaining" },
];

export default function Field05() {
  const [selected, setSelected] = useState<string[]>(["revenue", "churn"]);
  const atLimit = selected.length >= LIMIT;

  const toggle = (id: string, checked: boolean) => {
    setSelected((current) =>
      checked ? [...current, id] : current.filter((item) => item !== id),
    );
  };

  return (
    <FieldSet className="w-full max-w-md gap-3">
      <div className="flex items-start justify-between gap-3">
        <div className="flex flex-col gap-1">
          <FieldLegend variant="label" className="mb-0">
            Pinned widgets
          </FieldLegend>
          <p className="text-sm text-muted-foreground">
            Choose up to {LIMIT} for the top of your dashboard.
          </p>
        </div>
        <Badge
          variant={atLimit ? "default" : "secondary"}
          className="tabular-nums"
          aria-live="polite"
        >
          {selected.length}/{LIMIT}
        </Badge>
      </div>
      <div className="grid gap-2 sm:grid-cols-2">
        {widgets.map((widget) => {
          const checked = selected.includes(widget.id);
          return (
            <Field
              key={widget.id}
              name={widget.id}
              orientation="horizontal"
              disabled={atLimit && !checked}
              className="rounded-lg border border-border px-3 py-2.5 transition-colors has-data-checked:border-primary/30 has-data-checked:bg-primary/5 data-disabled:bg-muted/40 dark:has-data-checked:bg-primary/10"
            >
              <Checkbox
                checked={checked}
                onCheckedChange={(value) => toggle(widget.id, value)}
              />
              <FieldContent>
                <FieldLabel>{widget.label}</FieldLabel>
                <FieldDescription className="text-xs">
                  {widget.hint}
                </FieldDescription>
              </FieldContent>
            </Field>
          );
        })}
      </div>
    </FieldSet>
  );
}

TSX
"use client";

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

import { Field, FieldError, FieldLabel } from "@/components/ui/field";
import {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupInput,
} from "@/components/ui/input-group";

const rules = [
  {
    id: "length",
    label: "At least 12 characters",
    test: (v: string) => v.length >= 12,
  },
  {
    id: "case",
    label: "Upper and lowercase letters",
    test: (v: string) => /[a-z]/.test(v) && /[A-Z]/.test(v),
  },
  {
    id: "number",
    label: "At least one number",
    test: (v: string) => /\d/.test(v),
  },
  {
    id: "symbol",
    label: "At least one symbol",
    test: (v: string) => /[^A-Za-z0-9]/.test(v),
  },
];

const strengthLabels = ["Too weak", "Weak", "Fair", "Good", "Strong"];

export default function Field06() {
  const [password, setPassword] = useState("");
  const [visible, setVisible] = useState(false);
  const passed = rules.filter((rule) => rule.test(password)).length;

  const barColor =
    passed === rules.length
      ? "bg-success"
      : passed >= 2
        ? "bg-warning"
        : "bg-destructive";

  return (
    <div className="w-full max-w-sm">
      <Field
        name="newPassword"
        validationMode="onBlur"
        validate={(value) =>
          rules.every((rule) => rule.test(String(value ?? "")))
            ? null
            : "Your password doesn't meet every requirement yet."
        }
      >
        <FieldLabel>New password</FieldLabel>
        <InputGroup className="has-[[data-slot=input-group-control][data-valid]]:border-success/60">
          <InputGroupInput
            type={visible ? "text" : "password"}
            value={password}
            autoComplete="new-password"
            onChange={(event) => setPassword(event.target.value)}
          />
          <InputGroupAddon align="inline-end">
            <InputGroupButton
              size="icon-xs"
              aria-label={visible ? "Hide password" : "Show password"}
              aria-pressed={visible}
              onClick={() => setVisible((current) => !current)}
            >
              {visible ? (
                <EyeOffIcon aria-hidden="true" />
              ) : (
                <EyeIcon aria-hidden="true" />
              )}
            </InputGroupButton>
          </InputGroupAddon>
        </InputGroup>

        <div className="flex items-center gap-3">
          <div className="grid flex-1 grid-cols-4 gap-1" aria-hidden="true">
            {rules.map((rule, index) => (
              <span
                key={rule.id}
                className={cn(
                  "h-1 rounded-full bg-muted transition-colors duration-300",
                  index < passed && barColor,
                )}
              />
            ))}
          </div>
          <span
            aria-live="polite"
            className="w-16 text-right text-xs font-medium text-muted-foreground"
          >
            {password ? strengthLabels[passed] : ""}
          </span>
        </div>

        <ul className="grid gap-1.5 text-sm" aria-label="Password requirements">
          {rules.map((rule) => {
            const met = rule.test(password);
            return (
              <li
                key={rule.id}
                className={cn(
                  "flex items-center gap-2 transition-colors",
                  met ? "text-foreground" : "text-muted-foreground",
                )}
              >
                <span
                  className={cn(
                    "flex size-4 items-center justify-center rounded-full border transition-all duration-200",
                    met
                      ? "scale-100 border-success bg-success text-success-foreground"
                      : "scale-90 border-border",
                  )}
                >
                  <CheckIcon
                    aria-hidden="true"
                    className={cn(
                      "size-3 transition-opacity",
                      met ? "opacity-100" : "opacity-0",
                    )}
                  />
                </span>
                {rule.label}
                <span className="sr-only">{met ? "(met)" : "(not met)"}</span>
              </li>
            );
          })}
        </ul>
        <FieldError />
      </Field>
    </div>
  );
}

TSX
"use client";

import { useEffect, useRef, useState } from "react";
import { CircleCheckIcon, CircleXIcon } from "lucide-react";

import {
  Field,
  FieldDescription,
  FieldError,
  FieldLabel,
} from "@/components/ui/field";
import {
  InputGroup,
  InputGroupAddon,
  InputGroupInput,
  InputGroupText,
} from "@/components/ui/input-group";
import { Spinner } from "@/components/ui/spinner";

type Status = "idle" | "checking" | "available" | "taken";

type FieldActions = { validate: () => void };

// Stand-in for a server lookup; swap for your own API call.
const takenHandles = ["alex", "design", "sevenui", "studio", "maria"];

function lookupHandle(handle: string) {
  return new Promise<boolean>((resolve) => {
    setTimeout(() => resolve(!takenHandles.includes(handle)), 650);
  });
}

function suggestionsFor(handle: string) {
  return [`${handle}.studio`, `${handle}hq`, `the${handle}`];
}

export default function Field07() {
  const [handle, setHandle] = useState("studio");
  const [status, setStatus] = useState<Status>("idle");
  // Starts at 1 so the prefilled handle is checked on mount.
  const [revalidate, setRevalidate] = useState(1);
  const actionsRef = useRef<FieldActions | null>(null);
  const requestRef = useRef(0);

  // Validate on mount and after a suggestion is applied programmatically.
  useEffect(() => {
    if (revalidate > 0) actionsRef.current?.validate();
  }, [revalidate]);

  const validate = async (value: unknown) => {
    const next = String(value ?? "")
      .trim()
      .toLowerCase();
    const request = ++requestRef.current;

    if (next.length < 3) {
      setStatus("idle");
      return "Handles need at least 3 characters.";
    }
    if (!/^[a-z0-9._]+$/.test(next)) {
      setStatus("idle");
      return "Use letters, numbers, dots, or underscores.";
    }

    setStatus("checking");
    const available = await lookupHandle(next);
    if (request !== requestRef.current) return null;

    setStatus(available ? "available" : "taken");
    return available ? null : `@${next} is already taken.`;
  };

  const applySuggestion = (suggestion: string) => {
    setHandle(suggestion);
    setRevalidate((count) => count + 1);
  };

  return (
    <div className="w-full max-w-sm">
      <Field
        name="handle"
        actionsRef={actionsRef}
        validationMode="onChange"
        validationDebounceTime={400}
        validate={validate}
      >
        <FieldLabel>Public handle</FieldLabel>
        <InputGroup
          className={
            status === "available"
              ? "border-success/60 has-[[data-slot=input-group-control]:focus-visible]:border-success has-[[data-slot=input-group-control]:focus-visible]:ring-success/25"
              : undefined
          }
        >
          <InputGroupAddon>
            <InputGroupText>@</InputGroupText>
          </InputGroupAddon>
          <InputGroupInput
            value={handle}
            autoComplete="off"
            spellCheck={false}
            className="pl-0.5"
            onChange={(event) => setHandle(event.target.value)}
          />
          <InputGroupAddon align="inline-end">
            {status === "checking" && (
              <Spinner aria-label="Checking availability" />
            )}
            {status === "available" && (
              <CircleCheckIcon aria-hidden="true" className="text-success" />
            )}
            {status === "taken" && (
              <CircleXIcon aria-hidden="true" className="text-destructive" />
            )}
          </InputGroupAddon>
        </InputGroup>

        {status === "available" ? (
          <FieldDescription role="status" className="text-success">
            Good news: sevenui.dev/@{handle.trim().toLowerCase()} is yours to
            claim.
          </FieldDescription>
        ) : (
          <FieldDescription>
            {status === "checking"
              ? "Checking availability…"
              : "Your profile lives at sevenui.dev/@handle."}
          </FieldDescription>
        )}

        <FieldError />

        {status === "taken" && (
          <div className="flex flex-wrap items-center gap-1.5 text-sm animate-in fade-in-0 slide-in-from-top-1">
            <span className="text-muted-foreground">Try</span>
            {suggestionsFor(handle.trim().toLowerCase()).map((suggestion) => (
              <button
                key={suggestion}
                type="button"
                onClick={() => applySuggestion(suggestion)}
                className="rounded-md border border-border bg-muted/50 px-2 py-0.5 font-medium transition-colors outline-none hover:bg-muted focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50"
              >
                @{suggestion}
              </button>
            ))}
          </div>
        )}
      </Field>
    </div>
  );
}

TSX
"use client";

import { useState } from "react";
import { MoonIcon } from "lucide-react";

import { Checkbox } from "@/components/ui/checkbox";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldGroup,
  FieldLabel,
  FieldLegend,
  FieldSet,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { Switch } from "@/components/ui/switch";
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";

const days = [
  { value: "mon", short: "M", label: "Monday" },
  { value: "tue", short: "T", label: "Tuesday" },
  { value: "wed", short: "W", label: "Wednesday" },
  { value: "thu", short: "T", label: "Thursday" },
  { value: "fri", short: "F", label: "Friday" },
  { value: "sat", short: "S", label: "Saturday" },
  { value: "sun", short: "S", label: "Sunday" },
];

function describeDays(selected: string[]) {
  if (selected.length === 7) return "every day";
  if (selected.length === 0) return "no days";
  const weekdays = ["mon", "tue", "wed", "thu", "fri"];
  if (
    selected.length === 5 &&
    weekdays.every((day) => selected.includes(day))
  ) {
    return "weekdays";
  }
  return `${selected.length} days a week`;
}

export default function Field08() {
  const [enabled, setEnabled] = useState(true);
  const [from, setFrom] = useState("22:00");
  const [to, setTo] = useState("07:30");
  const [selectedDays, setSelectedDays] = useState<string[]>([
    "mon",
    "tue",
    "wed",
    "thu",
    "fri",
  ]);
  const [allowUrgent, setAllowUrgent] = useState(true);

  return (
    <div className="w-full max-w-md rounded-xl border border-border bg-card p-4 sm:p-5">
      <FieldGroup>
        <Field orientation="horizontal">
          <FieldContent>
            <FieldLabel>Quiet hours</FieldLabel>
            <FieldDescription>
              Pause push and desktop notifications while you're off.
            </FieldDescription>
          </FieldContent>
          <Switch
            checked={enabled}
            onCheckedChange={(checked) => setEnabled(checked)}
          />
        </Field>

        <div className="grid grid-cols-[repeat(auto-fit,minmax(7.5rem,1fr))] gap-3">
          <Field disabled={!enabled}>
            <FieldLabel>From</FieldLabel>
            <Input
              type="time"
              value={from}
              onChange={(event) => setFrom(event.target.value)}
            />
          </Field>
          <Field disabled={!enabled}>
            <FieldLabel>Until</FieldLabel>
            <Input
              type="time"
              value={to}
              onChange={(event) => setTo(event.target.value)}
            />
          </Field>
        </div>

        <FieldSet disabled={!enabled} className="disabled:opacity-50">
          <FieldLegend variant="label">Repeat on</FieldLegend>
          <ToggleGroup
            multiple
            variant="outline"
            spacing={1}
            value={selectedDays}
            onValueChange={(value) => setSelectedDays(value as string[])}
            disabled={!enabled}
            className="w-full"
          >
            {days.map((day) => (
              <ToggleGroupItem
                key={day.value}
                value={day.value}
                aria-label={day.label}
                className="min-w-0 flex-1 px-0 aria-pressed:border-primary aria-pressed:bg-primary aria-pressed:text-primary-foreground"
              >
                {day.short}
              </ToggleGroupItem>
            ))}
          </ToggleGroup>
        </FieldSet>

        <Field orientation="horizontal" disabled={!enabled}>
          <Checkbox
            checked={allowUrgent}
            onCheckedChange={(checked) => setAllowUrgent(checked)}
          />
          <FieldContent>
            <FieldLabel>Let urgent mentions through</FieldLabel>
            <FieldDescription>
              Direct messages marked urgent and on-call pages still notify you.
            </FieldDescription>
          </FieldContent>
        </Field>
      </FieldGroup>

      <p
        aria-live="polite"
        className="mt-5 flex items-start gap-2 rounded-lg bg-muted px-3 py-2.5 text-sm text-muted-foreground"
      >
        <MoonIcon aria-hidden="true" className="mt-0.5 size-4 shrink-0" />
        {enabled ? (
          <span>
            Muted{" "}
            <span className="font-medium text-foreground tabular-nums">
              {from}–{to}
            </span>
            , {describeDays(selectedDays)}.
            {allowUrgent ? " Urgent mentions still ring." : ""}
          </span>
        ) : (
          <span>Notifications arrive at any time.</span>
        )}
      </p>
    </div>
  );
}

TSX
"use client";

import { useState } from "react";
import { CreditCardIcon, LockIcon } from "lucide-react";

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import {
  InputGroup,
  InputGroupAddon,
  InputGroupInput,
} from "@/components/ui/input-group";

type FieldName = "name" | "number" | "expiry" | "cvc";

function formatNumber(value: string) {
  return value
    .replace(/\D/g, "")
    .slice(0, 16)
    .replace(/(\d{4})(?=\d)/g, "$1 ");
}

function formatExpiry(value: string) {
  const digits = value.replace(/\D/g, "").slice(0, 4);
  return digits.length > 2
    ? `${digits.slice(0, 2)} / ${digits.slice(2)}`
    : digits;
}

function detectBrand(number: string) {
  const digits = number.replace(/\D/g, "");
  if (/^4/.test(digits)) return "Visa";
  if (/^(5[1-5]|2[2-7])/.test(digits)) return "Mastercard";
  if (/^3[47]/.test(digits)) return "Amex";
  return null;
}

function passesLuhn(digits: string) {
  let sum = 0;
  for (let index = 0; index < digits.length; index++) {
    let digit = Number(digits[digits.length - 1 - index]);
    if (index % 2 === 1) {
      digit *= 2;
      if (digit > 9) digit -= 9;
    }
    sum += digit;
  }
  return sum % 10 === 0;
}

function isExpired(month: number, year: number) {
  const today = new Date();
  const currentYear = today.getFullYear();
  const currentMonth = today.getMonth() + 1;
  return year < currentYear || (year === currentYear && month < currentMonth);
}

function validate(values: Record<FieldName, string>) {
  const errors: Partial<Record<FieldName, string>> = {};
  if (values.name.trim().length < 2) {
    errors.name = "Enter the name printed on the card.";
  }
  const digits = values.number.replace(/\D/g, "");
  if (digits.length < 15 || !passesLuhn(digits)) {
    errors.number = "This card number looks incomplete. Check the digits.";
  }
  const [month, year] = values.expiry.split(" / ").map(Number);
  if (!month || !year || month > 12) {
    errors.expiry = "Use MM / YY.";
  } else if (isExpired(month, 2000 + year)) {
    errors.expiry = "This card has expired.";
  }
  if (!/^\d{3,4}$/.test(values.cvc)) {
    errors.cvc = "3 or 4 digits on the back.";
  }
  return errors;
}

export default function Field09() {
  const [values, setValues] = useState<Record<FieldName, string>>({
    name: "Harper Lin",
    number: "4242 4242 4242 4242",
    expiry: "",
    cvc: "",
  });
  const [touched, setTouched] = useState<Partial<Record<FieldName, boolean>>>(
    {},
  );
  const [paid, setPaid] = useState(false);
  const errors = validate(values);
  const brand = detectBrand(values.number);

  function update(name: FieldName, value: string) {
    setValues((current) => ({ ...current, [name]: value }));
    setPaid(false);
  }

  function errorFor(name: FieldName) {
    return touched[name] ? errors[name] : undefined;
  }

  function blur(name: FieldName) {
    return () => setTouched((current) => ({ ...current, [name]: true }));
  }

  return (
    <form
      noValidate
      className="w-full max-w-sm rounded-xl border border-border bg-card p-4 sm:p-5"
      onSubmit={(event) => {
        event.preventDefault();
        setTouched({ name: true, number: true, expiry: true, cvc: true });
        if (Object.keys(errors).length === 0) setPaid(true);
      }}
    >
      <div className="mb-5 flex flex-wrap items-baseline justify-between gap-x-3 gap-y-1">
        <h3 className="font-semibold">Payment details</h3>
        <span className="text-sm text-muted-foreground">
          Pro plan ·{" "}
          <span className="font-medium text-foreground tabular-nums">
            $48.00
          </span>
          /mo
        </span>
      </div>
      <FieldGroup className="gap-4">
        <Field invalid={!!errorFor("name")}>
          <FieldLabel>Name on card</FieldLabel>
          <Input
            autoComplete="cc-name"
            value={values.name}
            onChange={(event) => update("name", event.target.value)}
            onBlur={blur("name")}
          />
          <FieldError>{errorFor("name")}</FieldError>
        </Field>
        <Field invalid={!!errorFor("number")}>
          <FieldLabel>Card number</FieldLabel>
          <InputGroup>
            <InputGroupAddon>
              {brand ? (
                <span className="rounded-sm border border-border px-1 py-0.5 text-[0.65rem] font-semibold tracking-wide text-foreground uppercase">
                  {brand}
                </span>
              ) : (
                <CreditCardIcon aria-hidden="true" />
              )}
            </InputGroupAddon>
            <InputGroupInput
              inputMode="numeric"
              autoComplete="cc-number"
              placeholder="1234 1234 1234 1234"
              className="tabular-nums max-sm:tracking-tight"
              value={values.number}
              onChange={(event) =>
                update("number", formatNumber(event.target.value))
              }
              onBlur={blur("number")}
              aria-invalid={!!errorFor("number") || undefined}
            />
          </InputGroup>
          <FieldError>{errorFor("number")}</FieldError>
        </Field>
        <div className="grid grid-cols-2 gap-3">
          <Field invalid={!!errorFor("expiry")}>
            <FieldLabel>Expiry</FieldLabel>
            <Input
              inputMode="numeric"
              autoComplete="cc-exp"
              placeholder="MM / YY"
              className="tabular-nums"
              value={values.expiry}
              onChange={(event) =>
                update("expiry", formatExpiry(event.target.value))
              }
              onBlur={blur("expiry")}
            />
            <FieldError>{errorFor("expiry")}</FieldError>
          </Field>
          <Field invalid={!!errorFor("cvc")}>
            <FieldLabel>CVC</FieldLabel>
            <Input
              inputMode="numeric"
              autoComplete="cc-csc"
              placeholder="123"
              maxLength={4}
              className="tabular-nums"
              value={values.cvc}
              onChange={(event) =>
                update("cvc", event.target.value.replace(/\D/g, ""))
              }
              onBlur={blur("cvc")}
            />
            <FieldError>{errorFor("cvc")}</FieldError>
          </Field>
        </div>
      </FieldGroup>
      <Button type="submit" className="mt-6 w-full" disabled={paid}>
        <LockIcon aria-hidden="true" data-icon="inline-start" />
        {paid ? "Payment confirmed" : "Pay $48.00"}
      </Button>
      <p className="mt-3 text-center text-xs text-muted-foreground">
        Billed monthly. Cancel anytime from Billing settings.
      </p>
    </form>
  );
}

TSX
"use client";

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

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";

const roles = [
  {
    value: "admin",
    label: "Admin",
    hint: "Manage billing, members, and every project.",
  },
  {
    value: "member",
    label: "Member",
    hint: "Create projects and deploy to preview.",
  },
  {
    value: "viewer",
    label: "Viewer",
    hint: "Read-only access to projects and logs.",
  },
];

const existingMembers = ["maya@northwind.io", "daniel@northwind.io"];
const seatLimit = 10;
const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

export default function Field10() {
  const inputId = useId();
  const [emails, setEmails] = useState<string[]>(["priya@northwind.io"]);
  const [draft, setDraft] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [role, setRole] = useState<string | null>("member");
  const [sent, setSent] = useState<number | null>(null);
  const [seatsUsed, setSeatsUsed] = useState(7);
  const seatsLeft = seatLimit - seatsUsed - emails.length;
  const roleHint = roles.find((item) => item.value === role)?.hint;

  function commit(raw: string) {
    const candidates = raw
      .split(/[\s,;]+/)
      .map((value) => value.trim().toLowerCase())
      .filter(Boolean);
    if (candidates.length === 0) return;
    const next = [...emails];
    for (const email of candidates) {
      if (!emailPattern.test(email)) {
        setError(`"${email}" isn't a valid email address.`);
        return;
      }
      if (existingMembers.includes(email)) {
        setError(`${email} is already on the team.`);
        return;
      }
      if (next.includes(email)) continue;
      if (seatLimit - seatsUsed - next.length <= 0) {
        setError("No seats left. Remove someone or upgrade your plan.");
        return;
      }
      next.push(email);
    }
    setEmails(next);
    setDraft("");
    setError(null);
    setSent(null);
  }

  return (
    <form
      className="w-full max-w-md rounded-xl border border-border bg-card p-5"
      onSubmit={(event) => {
        event.preventDefault();
        if (draft.trim()) {
          commit(draft);
          return;
        }
        if (emails.length > 0) {
          setSent(emails.length);
          setSeatsUsed((current) => current + emails.length);
          setEmails([]);
        }
      }}
    >
      <div className="mb-5 flex flex-col gap-1">
        <h3 className="font-semibold">Invite teammates</h3>
        <p className="text-sm text-muted-foreground">
          They'll get an email with a link to join Northwind.
        </p>
      </div>
      <FieldGroup className="gap-4">
        <Field invalid={error !== null}>
          <FieldLabel htmlFor={inputId}>Email addresses</FieldLabel>
          <div className="flex min-h-8 flex-wrap items-center gap-1.5 rounded-lg border border-input px-1.5 py-1 transition-colors focus-within:border-ring focus-within:ring-3 focus-within:ring-ring/50 group-data-[invalid]/field:border-destructive dark:bg-input/30">
            {emails.map((email) => (
              <span
                key={email}
                className="inline-flex h-6 max-w-full items-center gap-1 rounded-md bg-muted pr-0.5 pl-2 text-xs font-medium text-foreground"
              >
                <span className="truncate">{email}</span>
                <button
                  type="button"
                  aria-label={`Remove ${email}`}
                  onClick={() =>
                    setEmails((current) =>
                      current.filter((item) => item !== email),
                    )
                  }
                  className="grid size-5 place-items-center rounded-sm text-muted-foreground outline-none hover:bg-background hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring"
                >
                  <XIcon aria-hidden="true" className="size-3" />
                </button>
              </span>
            ))}
            <input
              id={inputId}
              type="email"
              value={draft}
              placeholder={emails.length ? "Add another" : "name@company.com"}
              onChange={(event) => {
                setDraft(event.target.value);
                if (error) setError(null);
              }}
              onKeyDown={(event) => {
                if (
                  event.key === "Enter" ||
                  event.key === "," ||
                  event.key === " "
                ) {
                  if (draft.trim()) {
                    event.preventDefault();
                    commit(draft);
                  }
                } else if (
                  event.key === "Backspace" &&
                  draft === "" &&
                  emails.length > 0
                ) {
                  setEmails((current) => current.slice(0, -1));
                }
              }}
              onBlur={() => commit(draft)}
              onPaste={(event) => {
                event.preventDefault();
                commit(`${draft} ${event.clipboardData.getData("text")}`);
              }}
              aria-invalid={error !== null || undefined}
              className="h-6 min-w-32 flex-1 bg-transparent px-1 text-sm outline-none placeholder:text-muted-foreground"
            />
          </div>
          {error ? (
            <FieldError>{error}</FieldError>
          ) : (
            <FieldDescription>
              Press Enter or comma to add. Paste a list to add several at once.
            </FieldDescription>
          )}
        </Field>
        <Field>
          <FieldLabel>Role</FieldLabel>
          <Select items={roles} value={role} onValueChange={setRole}>
            <SelectTrigger className="w-full">
              <SelectValue />
            </SelectTrigger>
            <SelectContent>
              {roles.map((item) => (
                <SelectItem key={item.value} value={item.value}>
                  {item.label}
                </SelectItem>
              ))}
            </SelectContent>
          </Select>
          <FieldDescription>{roleHint}</FieldDescription>
        </Field>
      </FieldGroup>
      <div className="mt-6 flex flex-wrap items-center justify-between gap-3 border-t border-border pt-4">
        <p aria-live="polite" className="text-sm text-muted-foreground">
          {sent !== null ? (
            <span className="text-foreground">
              {sent} {sent === 1 ? "invite" : "invites"} sent.
            </span>
          ) : (
            <>
              <span className="font-medium text-foreground tabular-nums">
                {seatsLeft}
              </span>{" "}
              of {seatLimit} seats left
            </>
          )}
        </p>
        <Button type="submit" disabled={emails.length === 0 && !draft}>
          {emails.length > 1 ? `Send ${emails.length} invites` : "Send invite"}
        </Button>
      </div>
    </form>
  );
}

TSX
"use client";

import { useId, useState } from "react";
import {
  BugIcon,
  CheckCircle2Icon,
  CreditCardIcon,
  KeyRoundIcon,
  LifeBuoyIcon,
} from "lucide-react";

import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
  FieldLegend,
  FieldSet,
  FieldTitle,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { Textarea } from "@/components/ui/textarea";

const topics = [
  { value: "bug", title: "Something's broken", icon: BugIcon },
  { value: "billing", title: "Billing & invoices", icon: CreditCardIcon },
  { value: "access", title: "Account access", icon: KeyRoundIcon },
  { value: "other", title: "Something else", icon: LifeBuoyIcon },
];

const maxLength = 600;
const minLength = 30;

export default function Field11() {
  const messageId = useId();
  const [topic, setTopic] = useState("bug");
  const [subject, setSubject] = useState("");
  const [message, setMessage] = useState("");
  const [attachLogs, setAttachLogs] = useState(true);
  const [submitted, setSubmitted] = useState(false);
  const [ticket, setTicket] = useState<string | null>(null);

  const subjectError =
    submitted && subject.trim().length === 0
      ? "Add a short subject so we can route your request."
      : null;
  const messageError =
    submitted && message.trim().length < minLength
      ? `Add a few more details, at least ${minLength} characters.`
      : null;

  if (ticket) {
    return (
      <div className="flex w-full max-w-md flex-col items-center gap-2 rounded-xl border border-border bg-card p-8 text-center">
        <CheckCircle2Icon aria-hidden="true" className="size-8 text-success" />
        <h3 className="font-semibold">Request {ticket} received</h3>
        <p className="text-sm text-muted-foreground">
          We reply within 4 business hours. You'll get updates at
          harper@northwind.io.
        </p>
        <Button
          variant="outline"
          size="sm"
          className="mt-2"
          onClick={() => {
            setTicket(null);
            setSubject("");
            setMessage("");
            setSubmitted(false);
          }}
        >
          Open another request
        </Button>
      </div>
    );
  }

  return (
    <form
      noValidate
      className="w-full max-w-md rounded-xl border border-border bg-card p-5"
      onSubmit={(event) => {
        event.preventDefault();
        setSubmitted(true);
        if (subject.trim() && message.trim().length >= minLength) {
          setTicket("SUP-48213");
        }
      }}
    >
      <FieldGroup className="gap-5">
        <FieldSet>
          <FieldLegend variant="label">What do you need help with?</FieldLegend>
          <RadioGroup
            value={topic}
            onValueChange={(value) => setTopic(value as string)}
            className="grid grid-cols-2 gap-2"
          >
            {topics.map((item) => (
              // biome-ignore lint/a11y/noLabelWithoutControl: the label wraps the Base UI radio control
              <label
                key={item.value}
                className="flex w-full cursor-pointer rounded-lg border border-border transition-colors hover:bg-muted/50 has-data-checked:border-primary/30 has-data-checked:bg-primary/5 has-[:focus-visible]:border-ring has-[:focus-visible]:ring-3 has-[:focus-visible]:ring-ring/50 dark:has-data-checked:border-primary/20 dark:has-data-checked:bg-primary/10"
              >
                <Field orientation="horizontal" className="items-start p-2.5">
                  <FieldContent className="gap-2">
                    <item.icon
                      aria-hidden="true"
                      className="size-4 text-muted-foreground"
                    />
                    <FieldTitle>{item.title}</FieldTitle>
                  </FieldContent>
                  <RadioGroupItem value={item.value} />
                </Field>
              </label>
            ))}
          </RadioGroup>
        </FieldSet>

        <Field invalid={subjectError !== null}>
          <FieldLabel>Subject</FieldLabel>
          <Input
            value={subject}
            placeholder={
              topic === "billing"
                ? "Charged twice for September"
                : "Deploys stuck in queue"
            }
            onChange={(event) => setSubject(event.target.value)}
          />
          <FieldError>{subjectError}</FieldError>
        </Field>

        <Field invalid={messageError !== null}>
          <div className="flex items-baseline justify-between gap-2">
            <FieldLabel htmlFor={messageId}>Details</FieldLabel>
            <span
              className="text-xs text-muted-foreground tabular-nums"
              aria-hidden="true"
            >
              {message.length}/{maxLength}
            </span>
          </div>
          <Textarea
            id={messageId}
            rows={4}
            maxLength={maxLength}
            value={message}
            aria-invalid={messageError !== null || undefined}
            placeholder="What happened, what you expected, and any steps to reproduce."
            onChange={(event) => setMessage(event.target.value)}
          />
          <FieldError>{messageError}</FieldError>
        </Field>

        <Field orientation="horizontal">
          <Checkbox
            checked={attachLogs}
            onCheckedChange={(checked) => setAttachLogs(checked)}
          />
          <FieldContent>
            <FieldLabel>Attach diagnostic logs</FieldLabel>
            <FieldDescription>
              Last 24 hours of build and runtime logs. No secrets included.
            </FieldDescription>
          </FieldContent>
        </Field>

        <Button type="submit" className="w-full">
          Send request
        </Button>
      </FieldGroup>
    </form>
  );
}

TSX
"use client";

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

import { Button } from "@/components/ui/button";
import {
  Field,
  FieldContent,
  FieldDescription,
  FieldGroup,
  FieldLabel,
  FieldLegend,
  FieldSet,
} from "@/components/ui/field";
import {
  NumberField,
  NumberFieldDecrement,
  NumberFieldGroup,
  NumberFieldIncrement,
  NumberFieldInput,
} from "@/components/ui/number-field";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { Switch } from "@/components/ui/switch";
import { Textarea } from "@/components/ui/textarea";

const sizes = [
  { value: "xs", label: "XS", stock: 4, chest: "34–36 in" },
  { value: "s", label: "S", stock: 12, chest: "36–38 in" },
  { value: "m", label: "M", stock: 2, chest: "38–40 in" },
  { value: "l", label: "L", stock: 0, chest: "40–42 in" },
  { value: "xl", label: "XL", stock: 7, chest: "42–44 in" },
];

const unitPrice = 68;
const giftNoteLimit = 140;

export default function Field12() {
  const noteId = useId();
  const guideId = useId();
  const [showGuide, setShowGuide] = useState(false);
  const [added, setAdded] = useState<string | null>(null);
  const [size, setSize] = useState("m");
  const [quantity, setQuantity] = useState<number | null>(1);
  const [isGift, setIsGift] = useState(false);
  const [note, setNote] = useState("");
  const selected = sizes.find((item) => item.value === size);
  const maxQuantity = Math.max(selected?.stock ?? 1, 1);
  const count = Math.min(quantity ?? 1, maxQuantity);
  const total = count * unitPrice + (isGift ? 5 : 0);

  return (
    <form
      className="flex w-full max-w-sm flex-col gap-5"
      onSubmit={(event) => {
        event.preventDefault();
        setAdded(`${count} × ${selected?.label ?? ""}`);
      }}
      onChange={() => setAdded(null)}
    >
      <div className="flex gap-4">
        <img
          src="/placeholder.svg"
          alt="Merino crewneck sweater in oat"
          className="size-20 shrink-0 rounded-lg bg-muted object-cover"
        />
        <div className="flex flex-col gap-1">
          <h3 className="font-semibold">Merino crewneck</h3>
          <p className="text-sm text-muted-foreground">Oat · Midweight knit</p>
          <p className="text-sm font-medium tabular-nums">${unitPrice}.00</p>
        </div>
      </div>

      <FieldGroup className="gap-5">
        <FieldSet>
          <div className="flex items-baseline justify-between gap-2">
            <FieldLegend variant="label" className="mb-0">
              Size
            </FieldLegend>
            <button
              type="button"
              aria-expanded={showGuide}
              aria-controls={guideId}
              onClick={() => setShowGuide((current) => !current)}
              className="text-xs text-muted-foreground underline underline-offset-4 outline-none hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring"
            >
              {showGuide ? "Hide size guide" : "Size guide"}
            </button>
          </div>
          <RadioGroup
            value={size}
            onValueChange={(value) => {
              setSize(value as string);
              setAdded(null);
            }}
            className="grid grid-cols-5 gap-2"
          >
            {sizes.map((item) => (
              // biome-ignore lint/a11y/noLabelWithoutControl: the label wraps the Base UI radio control
              <label
                key={item.value}
                className="relative flex h-10 cursor-pointer items-center justify-center rounded-lg border border-input text-sm font-medium transition-colors hover:bg-muted has-data-checked:border-primary has-data-checked:bg-primary has-data-checked:text-primary-foreground has-data-disabled:cursor-not-allowed has-data-disabled:text-muted-foreground has-data-disabled:line-through has-data-disabled:hover:bg-transparent has-[:focus-visible]:ring-3 has-[:focus-visible]:ring-ring/50"
              >
                <RadioGroupItem
                  value={item.value}
                  disabled={item.stock === 0}
                  className="absolute opacity-0"
                />
                {item.label}
              </label>
            ))}
          </RadioGroup>
          {showGuide ? (
            <dl
              id={guideId}
              className="grid grid-cols-5 gap-2 rounded-lg bg-muted/50 px-2 py-2.5 text-center text-xs"
            >
              {sizes.map((item) => (
                <div key={item.value} className="flex flex-col gap-0.5">
                  <dt className="font-medium text-foreground">{item.label}</dt>
                  <dd className="text-muted-foreground tabular-nums">
                    {item.chest}
                  </dd>
                </div>
              ))}
            </dl>
          ) : null}
          <p aria-live="polite" className="text-sm text-muted-foreground">
            {selected && selected.stock <= 3
              ? `Only ${selected.stock} left in ${selected.label}. Fits true to size.`
              : "Fits true to size. Size L restocks October 6."}
          </p>
        </FieldSet>

        <Field>
          <FieldLabel>Quantity</FieldLabel>
          <NumberField
            value={count}
            onValueChange={(value) => {
              setQuantity(value);
              setAdded(null);
            }}
            min={1}
            max={maxQuantity}
            className="w-32"
          >
            <NumberFieldGroup>
              <NumberFieldDecrement />
              <NumberFieldInput />
              <NumberFieldIncrement />
            </NumberFieldGroup>
          </NumberField>
        </Field>

        <Field orientation="horizontal">
          <FieldContent>
            <FieldLabel>This is a gift</FieldLabel>
            <FieldDescription>
              Wrapped in recycled paper with a handwritten card, +$5.
            </FieldDescription>
          </FieldContent>
          <Switch
            checked={isGift}
            onCheckedChange={(checked) => {
              setIsGift(checked);
              setAdded(null);
            }}
          />
        </Field>

        {isGift ? (
          <Field>
            <FieldLabel htmlFor={noteId}>Card message</FieldLabel>
            <Textarea
              id={noteId}
              rows={3}
              maxLength={giftNoteLimit}
              value={note}
              placeholder="Happy birthday, Sam. Stay cozy this winter."
              onChange={(event) => setNote(event.target.value)}
            />
            <FieldDescription className="tabular-nums">
              {giftNoteLimit - note.length} characters left
            </FieldDescription>
          </Field>
        ) : null}
      </FieldGroup>

      <div className="flex flex-col gap-2">
        <Button type="submit" size="lg" className="w-full">
          <ShoppingBagIcon aria-hidden="true" data-icon="inline-start" />
          Add to bag · <span className="tabular-nums">${total}.00</span>
        </Button>
        <p
          role="status"
          className="flex min-h-5 items-center justify-center gap-1.5 text-sm text-muted-foreground"
        >
          {added ? (
            <>
              <CheckIcon aria-hidden="true" className="size-4 text-success" />
              Added {added} to your bag
            </>
          ) : null}
        </p>
      </div>
    </form>
  );
}