Textarea

TSX
"use client";

import { useId } from "react";

import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const sizes = [
  {
    key: "compact",
    size: "Compact",
    label: "Commit summary",
    placeholder: "fix(billing): round prorated seat charges to the cent",
    className: "min-h-10 rounded-md px-2 py-1 md:text-xs",
  },
  {
    key: "default",
    size: "Default",
    label: "Release note",
    placeholder: "Invoices now show prorated seat charges line by line.",
    className: "",
  },
  {
    key: "spacious",
    size: "Spacious",
    label: "Incident summary",
    placeholder:
      "Between 14:02 and 14:37 UTC, 3% of invoice exports failed because the PDF worker ran out of memory.",
    className: "min-h-28 rounded-xl px-3.5 py-3 md:text-base",
  },
] as const;

export default function Textarea01() {
  const id = useId();

  return (
    <div className="flex w-full max-w-md flex-col gap-6">
      {sizes.map((item) => {
        const inputId = `${id}-${item.key}`;
        return (
          <div key={item.key} className="flex flex-col gap-2">
            <div className="flex items-baseline justify-between gap-3">
              <Label htmlFor={inputId}>{item.label}</Label>
              <span className="text-xs text-muted-foreground">{item.size}</span>
            </div>
            <Textarea
              id={inputId}
              placeholder={item.placeholder}
              className={item.className}
            />
          </div>
        );
      })}
    </div>
  );
}

TSX
"use client";

import { useId, useState } from "react";

import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";

const surfaces = {
  outline: {
    label: "Outline",
    hint: "Default border. Use on plain page backgrounds.",
    className: "",
  },
  filled: {
    label: "Filled",
    hint: "Tinted fill, no border. Reads well inside dense forms.",
    className:
      "border-transparent bg-muted focus-visible:bg-background dark:bg-muted dark:focus-visible:bg-input/30",
  },
  ghost: {
    label: "Ghost",
    hint: "Invisible until hovered or focused. Good for inline editing.",
    className:
      "border-transparent px-2 hover:bg-muted/60 focus-visible:bg-background dark:bg-transparent dark:focus-visible:bg-input/30",
  },
} as const;

type Surface = keyof typeof surfaces;

export default function Textarea02() {
  const id = useId();
  const [surface, setSurface] = useState<Surface>("filled");
  const current = surfaces[surface];

  return (
    <div className="flex w-full max-w-md flex-col gap-4">
      <ToggleGroup
        variant="outline"
        size="sm"
        spacing={0}
        aria-label="Textarea surface style"
        value={[surface]}
        onValueChange={(value) => {
          const next = value[0] as Surface | undefined;
          if (next) setSurface(next);
        }}
      >
        {(Object.keys(surfaces) as Surface[]).map((key) => (
          <ToggleGroupItem key={key} value={key} className="px-3">
            {surfaces[key].label}
          </ToggleGroupItem>
        ))}
      </ToggleGroup>
      <div className="flex flex-col gap-2">
        <Label htmlFor={`${id}-notes`}>Account notes</Label>
        <Textarea
          id={`${id}-notes`}
          aria-describedby={`${id}-hint`}
          defaultValue={
            "Acme Corp, 42 seats on Team\n- Wants SSO before the October renewal\n- Finance contact is Priya Shah, invoices by PO only"
          }
          className={current.className}
        />
        <p id={`${id}-hint`} className="text-xs text-muted-foreground">
          {current.hint}
        </p>
      </div>
    </div>
  );
}

TSX
"use client";

import { CheckIcon, CopyIcon, LockIcon } from "lucide-react";
import { useEffect, useId, useRef, useState } from "react";

import {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupText,
} from "@/components/ui/input-group";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const recoveryCodes = [
  "7KQ2-M9XD",
  "PL4H-83ZR",
  "W2NC-6TFJ",
  "BY8V-Q5LA",
  "3RDG-H7KE",
  "N6XU-2CPW",
].join("\n");

export default function Textarea03() {
  const id = useId();
  const [copied, setCopied] = useState(false);
  const timer = useRef<ReturnType<typeof setTimeout> | null>(null);

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

  function handleCopy() {
    navigator.clipboard?.writeText(recoveryCodes).catch(() => {});
    setCopied(true);
    if (timer.current) clearTimeout(timer.current);
    timer.current = setTimeout(() => setCopied(false), 2000);
  }

  return (
    <div className="flex w-full max-w-xs flex-col gap-2">
      <Label htmlFor={`${id}-codes`}>Recovery codes</Label>
      <InputGroup className="bg-muted/40 dark:bg-muted/30">
        <InputGroupAddon align="block-start" className="border-b">
          <InputGroupText className="text-xs">
            <LockIcon aria-hidden="true" className="size-3.5" />
            Read-only
          </InputGroupText>
          <InputGroupButton
            size="xs"
            className="ml-auto"
            onClick={handleCopy}
            aria-label={copied ? "Recovery codes copied" : "Copy recovery codes"}
          >
            {copied ? (
              <CheckIcon aria-hidden="true" className="text-success" />
            ) : (
              <CopyIcon aria-hidden="true" />
            )}
            {copied ? "Copied" : "Copy"}
          </InputGroupButton>
        </InputGroupAddon>
        <Textarea
          data-slot="input-group-control"
          id={`${id}-codes`}
          readOnly
          rows={6}
          value={recoveryCodes}
          aria-describedby={`${id}-hint`}
          className="flex-1 cursor-default resize-none rounded-none border-0 bg-transparent px-3 py-3 shadow-none focus-visible:ring-0 dark:bg-transparent font-mono text-sm leading-6 tracking-wider tabular-nums"
        />
      </InputGroup>
      <p id={`${id}-hint`} className="text-xs text-muted-foreground">
        Each code signs you in once if you lose your authenticator. Store them
        somewhere safe.
      </p>
    </div>
  );
}

TSX
"use client";

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

import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const MIN_LENGTH = 30;

export default function Textarea04() {
  const id = useId();
  const [value, setValue] = useState("Upgraded by mistake");
  const [touched, setTouched] = useState(true);

  const length = value.trim().length;
  const isValid = length >= MIN_LENGTH;
  const showError = touched && !isValid;
  const showSuccess = touched && isValid;

  return (
    <form
      className="flex w-full max-w-sm flex-col gap-2"
      noValidate
      onSubmit={(event) => {
        event.preventDefault();
        setTouched(true);
      }}
    >
      <Label htmlFor={`${id}-reason`}>Reason for refund</Label>
      <Textarea
        id={`${id}-reason`}
        value={value}
        required
        minLength={MIN_LENGTH}
        aria-invalid={showError || undefined}
        aria-describedby={`${id}-status`}
        onChange={(event) => setValue(event.target.value)}
        onBlur={() => setTouched(true)}
        className={
          showSuccess
            ? "border-success focus-visible:border-success focus-visible:ring-success/25"
            : undefined
        }
      />
      <p
        id={`${id}-status`}
        aria-live="polite"
        className={
          showError
            ? "flex items-start gap-1.5 text-sm text-destructive"
            : showSuccess
              ? "flex items-start gap-1.5 text-sm text-success"
              : "text-sm text-muted-foreground"
        }
      >
        {showError ? (
          <>
            <CircleAlertIcon aria-hidden="true" className="mt-0.5 size-4 shrink-0" />
            Add {MIN_LENGTH - length} more characters so billing can locate the
            charge. Include the date and last four card digits.
          </>
        ) : showSuccess ? (
          <>
            <CircleCheckIcon aria-hidden="true" className="mt-0.5 size-4 shrink-0" />
            Looks good. Billing replies within one business day.
          </>
        ) : (
          `At least ${MIN_LENGTH} characters.`
        )}
      </p>
      <Button type="submit" className="mt-2 self-end">
        Request refund
      </Button>
    </form>
  );
}

TSX
"use client";

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

import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const LIMIT = 160;
const INITIAL_TEMPLATE =
  "Hi {first_name}, reminder: your cleaning at Brightside Dental is Tue, Oct 14 at 9:30 AM. Reply C to confirm or R to reschedule.";

export default function Textarea05() {
  const id = useId();
  const [message, setMessage] = useState(INITIAL_TEMPLATE);
  const [savedMessage, setSavedMessage] = useState(INITIAL_TEMPLATE);

  const count = message.length;
  const remaining = LIMIT - count;
  const ratio = Math.min(count / LIMIT, 1);
  const over = remaining < 0;
  const near = !over && remaining <= 20;
  const dirty = message !== savedMessage;

  const barColor = over ? "bg-destructive" : near ? "bg-warning" : "bg-primary";
  const countColor = over
    ? "text-destructive"
    : near
      ? "text-warning"
      : "text-muted-foreground";

  return (
    <div className="flex w-full max-w-sm flex-col gap-2">
      <div className="flex items-baseline justify-between gap-3">
        <Label htmlFor={`${id}-sms`}>Reminder text</Label>
        <span
          id={`${id}-count`}
          aria-live="polite"
          className={`text-xs tabular-nums transition-colors ${countColor}`}
        >
          {over
            ? `${-remaining} over, splits into 2 texts`
            : `${remaining} left in 1 text`}
        </span>
      </div>
      <div className="flex flex-col overflow-hidden rounded-lg">
        <Textarea
          id={`${id}-sms`}
          value={message}
          rows={4}
          aria-invalid={over || undefined}
          aria-describedby={`${id}-count`}
          onChange={(event) => setMessage(event.target.value)}
          className="resize-none rounded-b-none"
        />
        <div aria-hidden="true" className="h-1 w-full bg-muted">
          <div
            className={`h-full origin-left transition-[transform,background-color] duration-300 ease-out motion-reduce:transition-none ${barColor}`}
            style={{ transform: `scaleX(${ratio})` }}
          />
        </div>
      </div>
      <div className="flex items-center justify-between gap-3">
        <p className="text-xs text-muted-foreground">
          Sent by SMS 24 hours before each appointment.
        </p>
        <Button
          size="sm"
          className="shrink-0"
          disabled={over || !dirty}
          onClick={() => setSavedMessage(message)}
        >
          {dirty ? null : <CheckIcon aria-hidden="true" />}
          {dirty ? "Save template" : "Saved"}
        </Button>
      </div>
    </div>
  );
}

TSX
"use client";

import { CloudCheckIcon } from "lucide-react";
import { useEffect, useId, useRef, useState } from "react";

import { Label } from "@/components/ui/label";
import { Spinner } from "@/components/ui/spinner";
import { Textarea } from "@/components/ui/textarea";

const WORDS_PER_MINUTE = 200;

const initialDraft = `This week we shipped usage-based billing to the first 40 workspaces. Invoices now itemize API calls per project, and nobody has opened a billing ticket about it yet.

Next week: move the remaining Team plans over and retire the old seat calculator.`;

type SaveState = "saved" | "saving";

function countWords(text: string) {
  return text.trim() ? text.trim().split(/\s+/).length : 0;
}

export default function Textarea06() {
  const id = useId();
  const [draft, setDraft] = useState(initialDraft);
  const [saveState, setSaveState] = useState<SaveState>("saved");
  const [savedAt, setSavedAt] = useState("9:41 AM");
  const timer = useRef<ReturnType<typeof setTimeout> | null>(null);

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

  function handleChange(value: string) {
    setDraft(value);
    setSaveState("saving");
    if (timer.current) clearTimeout(timer.current);
    // Debounce: save once typing pauses for 800ms.
    timer.current = setTimeout(() => {
      setSaveState("saved");
      setSavedAt(
        new Date().toLocaleTimeString("en-US", {
          hour: "numeric",
          minute: "2-digit",
        }),
      );
    }, 800);
  }

  const words = countWords(draft);
  const minutes = Math.max(1, Math.round(words / WORDS_PER_MINUTE));

  return (
    <div className="flex w-full max-w-lg flex-col gap-2">
      <div className="flex items-center justify-between gap-3">
        <Label htmlFor={`${id}-draft`}>Weekly update to #billing-team</Label>
        <p
          aria-live="polite"
          className="flex shrink-0 items-center gap-1.5 text-xs text-muted-foreground"
        >
          {saveState === "saving" ? (
            <>
              <Spinner aria-hidden="true" className="size-3.5" />
              Saving
            </>
          ) : (
            <>
              <CloudCheckIcon aria-hidden="true" className="size-3.5" />
              Saved at {savedAt}
            </>
          )}
        </p>
      </div>
      <Textarea
        id={`${id}-draft`}
        value={draft}
        onChange={(event) => handleChange(event.target.value)}
        aria-describedby={`${id}-meta`}
        placeholder="What shipped, what slipped, and what is next?"
        className="min-h-40 leading-relaxed"
      />
      <div
        id={`${id}-meta`}
        className="flex flex-wrap items-center justify-between gap-x-3 gap-y-1 text-xs text-muted-foreground"
      >
        <span className="tabular-nums">
          {words} {words === 1 ? "word" : "words"} · about {minutes} min read
        </span>
        <span>Drafts are kept for 30 days.</span>
      </div>
    </div>
  );
}

TSX
"use client";

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

import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Spinner } from "@/components/ui/spinner";
import { Textarea } from "@/components/ui/textarea";

type Status = "idle" | "sending" | "sent";

export default function Textarea07() {
  const id = useId();
  const [message, setMessage] = useState(
    "The CSV export drops the timezone from the created_at column, so our finance sheet shifts every row by two hours.",
  );
  const [status, setStatus] = useState<Status>("idle");
  const timer = useRef<ReturnType<typeof setTimeout> | null>(null);

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

  const sending = status === "sending";
  const sent = status === "sent";

  function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!message.trim()) return;
    setStatus("sending");
    timer.current = setTimeout(() => setStatus("sent"), 1600);
  }

  return (
    <form className="flex w-full max-w-sm flex-col gap-2" onSubmit={handleSubmit}>
      <Label htmlFor={`${id}-feedback`}>Report a problem</Label>
      <div className="relative">
        <Textarea
          id={`${id}-feedback`}
          value={message}
          rows={4}
          disabled={sending}
          readOnly={sent}
          aria-busy={sending || undefined}
          aria-describedby={`${id}-status`}
          onChange={(event) => setMessage(event.target.value)}
          className={
            sent
              ? "resize-none border-success/40 bg-success/5 text-muted-foreground dark:bg-success/10"
              : "resize-none"
          }
        />
        {sending ? (
          <div
            aria-hidden="true"
            className="pointer-events-none absolute inset-x-0 bottom-0 h-0.5 overflow-hidden rounded-b-lg"
          >
            <div className="h-full w-1/3 animate-pulse bg-primary motion-reduce:animate-none" />
          </div>
        ) : null}
      </div>
      <div className="flex min-h-8 items-center justify-between gap-3">
        <p
          id={`${id}-status`}
          aria-live="polite"
          className={
            sent
              ? "flex items-center gap-1.5 text-sm text-success"
              : "text-sm text-muted-foreground"
          }
        >
          {sent ? (
            <>
              <CircleCheckIcon aria-hidden="true" className="size-4" />
              Sent. Ticket 7310 is open.
            </>
          ) : sending ? (
            "Sending to support..."
          ) : (
            "Goes to support with your workspace ID."
          )}
        </p>
        {sent ? (
          <Button
            type="button"
            variant="outline"
            size="sm"
            onClick={() => {
              setMessage("");
              setStatus("idle");
            }}
          >
            New report
          </Button>
        ) : (
          <Button type="submit" size="sm" disabled={sending || !message.trim()}>
            {sending ? <Spinner aria-hidden="true" /> : null}
            {sending ? "Sending" : "Send report"}
          </Button>
        )}
      </div>
    </form>
  );
}

TSX
"use client";

import {
  AtSignIcon,
  BoldIcon,
  ItalicIcon,
  LinkIcon,
  ListIcon,
} from "lucide-react";
import { useId, useRef, useState } from "react";

import { Button } from "@/components/ui/button";
import { Textarea } from "@/components/ui/textarea";

const tools = [
  { key: "bold", label: "Bold", icon: BoldIcon },
  { key: "italic", label: "Italic", icon: ItalicIcon },
  { key: "link", label: "Insert link", icon: LinkIcon },
  { key: "list", label: "Bulleted list", icon: ListIcon },
  { key: "mention", label: "Mention a teammate", icon: AtSignIcon },
] as const;

type ToolKey = (typeof tools)[number]["key"];

// Markdown each tool writes around (or in place of) the current selection.
function format(tool: ToolKey, selected: string) {
  switch (tool) {
    case "bold":
      return { before: "**", text: selected || "bold text", after: "**" };
    case "italic":
      return { before: "_", text: selected || "italic text", after: "_" };
    case "link":
      return { before: "[", text: selected || "link text", after: "](https://)" };
    case "list":
      return { before: "- ", text: selected || "list item", after: "" };
    case "mention":
      return { before: "@", text: selected || "priya", after: " " };
  }
}

export default function Textarea08() {
  const id = useId();
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const [value, setValue] = useState("");
  const [focused, setFocused] = useState(false);
  const [notes, setNotes] = useState<string[]>([]);
  const expanded = focused || value.length > 0;

  function applyTool(tool: ToolKey) {
    const textarea = textareaRef.current;
    const start = textarea?.selectionStart ?? value.length;
    const end = textarea?.selectionEnd ?? value.length;
    const { before, text, after } = format(tool, value.slice(start, end));
    // Lists start on their own line.
    const prefix =
      tool === "list" && start > 0 && value[start - 1] !== "\n" ? "\n" : "";
    const inserted = prefix + before + text + after;
    setValue(value.slice(0, start) + inserted + value.slice(end));
    const selectionStart = start + prefix.length + before.length;
    requestAnimationFrame(() => {
      textarea?.focus();
      textarea?.setSelectionRange(selectionStart, selectionStart + text.length);
    });
  }

  function saveNote() {
    const note = value.trim();
    if (!note) return;
    setNotes((current) => [note, ...current]);
    setValue("");
    textareaRef.current?.focus();
  }

  return (
    <div className="flex w-full min-w-0 max-w-md flex-col gap-3">
      <fieldset
        aria-label="Deal note composer"
        data-expanded={expanded || undefined}
        className="group/composer w-full min-w-0 max-w-md rounded-xl border border-input bg-card shadow-xs transition-[border-color,box-shadow] duration-200 focus-within:border-ring focus-within:ring-3 focus-within:ring-ring/50 data-expanded:shadow-md"
        onFocus={() => setFocused(true)}
        onBlur={(event) => {
          if (!event.currentTarget.contains(event.relatedTarget as Node | null)) {
            setFocused(false);
          }
        }}
      >
        <label htmlFor={`${id}-note`} className="sr-only">
          Add a note to this deal
        </label>
        <Textarea
          ref={textareaRef}
          id={`${id}-note`}
          value={value}
          onChange={(event) => setValue(event.target.value)}
          placeholder="Add a note to Acme Corp renewal..."
          className="min-h-10 resize-none rounded-xl border-0 bg-transparent px-3 py-2.5 shadow-none transition-[min-height] duration-300 ease-out group-data-expanded/composer:min-h-28 focus-visible:ring-0 motion-reduce:transition-none dark:bg-transparent"
        />
        <div className="grid grid-rows-[0fr] transition-[grid-template-rows] duration-300 ease-out group-data-expanded/composer:grid-rows-[1fr] motion-reduce:transition-none">
          <div className="overflow-hidden">
            <div
              inert={!expanded}
              className="flex items-center justify-between gap-2 border-t border-border px-2 py-2 opacity-0 transition-opacity duration-200 group-data-expanded/composer:opacity-100"
            >
              <div role="toolbar" aria-label="Formatting" className="flex items-center gap-0.5">
                {tools.map((tool) => (
                  <Button
                    key={tool.key}
                    type="button"
                    variant="ghost"
                    size="icon-sm"
                    aria-label={tool.label}
                    onClick={() => applyTool(tool.key)}
                    className="text-muted-foreground"
                  >
                    <tool.icon aria-hidden="true" />
                  </Button>
                ))}
              </div>
              <Button size="sm" disabled={!value.trim()} onClick={saveNote}>
                Save note
              </Button>
            </div>
          </div>
        </div>
      </fieldset>
      {notes.length > 0 ? (
        <ul aria-label="Saved notes" aria-live="polite" className="flex flex-col gap-2">
          {notes.map((note, index) => (
            <li
              // biome-ignore lint/suspicious/noArrayIndexKey: notes are append-only
              key={notes.length - index}
              className="rounded-lg border border-border bg-muted/40 px-3 py-2 text-sm break-words whitespace-pre-wrap"
            >
              {note}
            </li>
          ))}
        </ul>
      ) : null}
    </div>
  );
}

TSX
"use client";

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

import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const MAX_LENGTH = 180;

const addresses = [
  { name: "Maya Chen", line: "1482 Alder Street, Apt 3B, Portland, OR 97205" },
  { name: "Maya Chen (work)", line: "700 SW Main Street, Floor 4, Portland, OR 97204" },
];

const suggestions = [
  "Leave at the front door",
  "Ring the bell twice",
  "Gate code 4471",
  "Hand to the concierge",
];

export default function Textarea09() {
  const id = useId();
  const [note, setNote] = useState("");
  const [addressIndex, setAddressIndex] = useState(0);
  const address = addresses[addressIndex];

  const remaining = MAX_LENGTH - note.length;

  const addSuggestion = (text: string) => {
    setNote((current) => {
      const trimmed = current.trimEnd();
      const next = trimmed ? `${trimmed.replace(/[.,]$/, "")}. ${text}.` : `${text}.`;
      return next.slice(0, MAX_LENGTH);
    });
  };

  return (
    <section
      aria-labelledby={`${id}-heading`}
      className="flex w-full max-w-sm flex-col gap-4 rounded-xl border border-border bg-card p-4 text-card-foreground"
    >
      <div className="flex items-start gap-3">
        <span className="flex size-8 shrink-0 items-center justify-center rounded-lg bg-muted text-muted-foreground">
          <MapPinIcon aria-hidden="true" className="size-4" />
        </span>
        <div className="min-w-0 flex-1">
          <h3 id={`${id}-heading`} className="text-sm font-medium">
            Shipping to {address.name}
          </h3>
          <p aria-live="polite" className="text-sm text-muted-foreground">
            {address.line}
          </p>
        </div>
        <Button
          variant="link"
          size="sm"
          className="h-auto px-0"
          onClick={() => setAddressIndex((index) => (index + 1) % addresses.length)}
        >
          Change
        </Button>
      </div>

      <div className="flex flex-col gap-2">
        <div className="flex items-baseline justify-between gap-2">
          <Label htmlFor={`${id}-note`}>Delivery instructions</Label>
          <span className="text-xs text-muted-foreground">Optional</span>
        </div>
        <Textarea
          id={`${id}-note`}
          value={note}
          maxLength={MAX_LENGTH}
          onChange={(event) => setNote(event.target.value)}
          placeholder="Anything the courier should know to get your parcel to you?"
          aria-describedby={`${id}-count`}
          className="min-h-20 resize-none"
        />
        <fieldset className="flex min-w-0 flex-wrap gap-1.5">
          <legend className="sr-only">Quick instructions</legend>
          {suggestions.map((suggestion) => {
            const used = note.includes(suggestion);
            return (
              <Button
                key={suggestion}
                type="button"
                variant="outline"
                size="xs"
                disabled={used || remaining < suggestion.length + 2}
                onClick={() => addSuggestion(suggestion)}
                className="rounded-full"
              >
                <PlusIcon aria-hidden="true" />
                {suggestion}
              </Button>
            );
          })}
        </fieldset>
        <p
          id={`${id}-count`}
          aria-live="polite"
          className="text-xs text-muted-foreground tabular-nums"
        >
          Shared with the courier only. {remaining} characters left.
        </p>
      </div>
    </section>
  );
}

TSX
"use client";

import { useId, useState } from "react";

import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const MAX_LENGTH = 160;
const SAVED_BIO =
  "Product designer at Northwind. Building calm tools for busy support teams. Based in Lisbon.";

export default function Textarea10() {
  const id = useId();
  const [savedBio, setSavedBio] = useState(SAVED_BIO);
  const [bio, setBio] = useState(SAVED_BIO);

  const isDirty = bio.trim() !== savedBio.trim();
  const remaining = MAX_LENGTH - bio.length;

  return (
    <form
      aria-labelledby={`${id}-heading`}
      className="w-full max-w-lg overflow-hidden rounded-xl border border-border bg-card text-card-foreground"
      onSubmit={(event) => {
        event.preventDefault();
        setSavedBio(bio.trim());
        setBio(bio.trim());
      }}
    >
      <div className="grid gap-4 p-4 sm:grid-cols-[10rem_1fr] sm:gap-6 sm:p-6">
        <div className="flex flex-col gap-1">
          <h3 id={`${id}-heading`} className="text-sm font-medium">
            Public bio
          </h3>
          <p className="text-sm text-muted-foreground">
            Shown on your profile and next to your comments.
          </p>
        </div>

        <div className="flex min-w-0 flex-col gap-3">
          <div className="flex flex-col gap-2">
            <Label htmlFor={`${id}-bio`} className="sr-only">
              Bio
            </Label>
            <Textarea
              id={`${id}-bio`}
              value={bio}
              maxLength={MAX_LENGTH}
              onChange={(event) => setBio(event.target.value)}
              aria-describedby={`${id}-count`}
              className="min-h-24"
            />
            <p
              id={`${id}-count`}
              className="text-right text-xs text-muted-foreground tabular-nums"
            >
              {remaining} / {MAX_LENGTH}
            </p>
          </div>

          <div className="flex items-start gap-3 rounded-lg bg-muted/60 p-3">
            <Avatar size="sm">
              <AvatarFallback>IR</AvatarFallback>
            </Avatar>
            <div className="min-w-0 flex-1">
              <p className="text-sm font-medium">Inês Rocha</p>
              <p className="text-sm break-words text-muted-foreground">
                {bio.trim() || "No bio yet."}
              </p>
            </div>
          </div>
        </div>
      </div>

      <div className="flex items-center justify-between gap-3 border-t border-border bg-muted/40 px-4 py-3 sm:px-6">
        <p aria-live="polite" className="text-xs text-muted-foreground">
          {isDirty ? "You have unsaved changes." : "All changes saved."}
        </p>
        <div className="flex gap-2">
          <Button
            type="button"
            variant="ghost"
            size="sm"
            disabled={!isDirty}
            onClick={() => setBio(savedBio)}
          >
            Discard
          </Button>
          <Button type="submit" size="sm" disabled={!isDirty}>
            Save
          </Button>
        </div>
      </div>
    </form>
  );
}

TSX
"use client";

import { SendIcon, ZapIcon } from "lucide-react";
import { useId, useRef, useState } from "react";

import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Kbd, KbdGroup } from "@/components/ui/kbd";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const macros = [
  {
    label: "Refund issued",
    text: "Hi Jordan, I've issued a full refund of $29.00 to your Visa ending in 4242. It usually shows up within 5 to 7 business days.",
  },
  {
    label: "Need order number",
    text: "Hi Jordan, thanks for reaching out. Could you share the order number from your confirmation email so I can look into this?",
  },
  {
    label: "Escalated",
    text: "Hi Jordan, I've passed this to our billing team and marked it urgent. You'll hear back from us within one business day.",
  },
];

type Message = { id: number; from: "customer" | "agent"; body: string };

const initialThread: Message[] = [
  {
    id: 1,
    from: "customer",
    body: "I was charged twice for my March subscription. Can you refund the duplicate payment?",
  },
];

export default function Textarea11() {
  const id = useId();
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const [thread, setThread] = useState(initialThread);
  const [reply, setReply] = useState("");

  const canSend = reply.trim().length > 0;

  const send = () => {
    if (!canSend) return;
    setThread((current) => [
      ...current,
      { id: current.length + 1, from: "agent", body: reply.trim() },
    ]);
    setReply("");
  };

  const applyMacro = (text: string) => {
    setReply(text);
    textareaRef.current?.focus();
  };

  return (
    <div className="flex w-full max-w-md flex-col overflow-hidden rounded-xl border border-border bg-card text-card-foreground">
      <div className="flex items-center justify-between gap-3 border-b border-border px-4 py-3">
        <div className="min-w-0">
          <p className="truncate text-sm font-medium">Duplicate charge on March invoice</p>
          <p className="text-xs text-muted-foreground">Ticket 4821 · Jordan Ellis</p>
        </div>
        <Badge variant="secondary">Open</Badge>
      </div>

      <ol aria-label="Conversation" className="flex flex-col gap-3 px-4 py-4">
        {thread.map((message) => (
          <li
            key={message.id}
            className={
              message.from === "agent"
                ? "flex flex-row-reverse items-end gap-2"
                : "flex items-end gap-2"
            }
          >
            <Avatar size="sm">
              <AvatarFallback>
                {message.from === "agent" ? "You" : "JE"}
              </AvatarFallback>
            </Avatar>
            <p
              className={
                message.from === "agent"
                  ? "max-w-[80%] rounded-2xl rounded-br-sm bg-primary px-3 py-2 text-sm text-primary-foreground"
                  : "max-w-[80%] rounded-2xl rounded-bl-sm bg-muted px-3 py-2 text-sm"
              }
            >
              {message.body}
            </p>
          </li>
        ))}
      </ol>

      <form
        className="flex flex-col gap-2 border-t border-border bg-muted/30 p-3"
        onSubmit={(event) => {
          event.preventDefault();
          send();
        }}
      >
        <fieldset className="flex min-w-0 gap-1.5 overflow-x-auto pb-1">
          <legend className="sr-only">Saved replies</legend>
          {macros.map((macro) => (
            <Button
              key={macro.label}
              type="button"
              variant="outline"
              size="xs"
              className="shrink-0"
              onClick={() => applyMacro(macro.text)}
            >
              <ZapIcon aria-hidden="true" />
              {macro.label}
            </Button>
          ))}
        </fieldset>
        <Label htmlFor={`${id}-reply`} className="sr-only">
          Reply to Jordan
        </Label>
        <Textarea
          ref={textareaRef}
          id={`${id}-reply`}
          value={reply}
          onChange={(event) => setReply(event.target.value)}
          onKeyDown={(event) => {
            if (event.key === "Enter" && (event.metaKey || event.ctrlKey)) {
              event.preventDefault();
              send();
            }
          }}
          placeholder="Reply to Jordan…"
          aria-describedby={`${id}-hint`}
          className="max-h-40 min-h-20 bg-background dark:bg-input/30"
        />
        <div className="flex items-center justify-between gap-2">
          <p
            id={`${id}-hint`}
            className="flex items-center gap-1.5 text-xs text-muted-foreground"
          >
            <KbdGroup>
              <Kbd>Ctrl</Kbd>
              <Kbd>Enter</Kbd>
            </KbdGroup>
            to send
          </p>
          <Button type="submit" size="sm" disabled={!canSend}>
            Send reply
            <SendIcon aria-hidden="true" data-icon="inline-end" />
          </Button>
        </div>
      </form>
    </div>
  );
}

TSX
"use client";

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

import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const initialUrls = `https://app.northwind.dev/auth/callback
https://staging.northwind.dev/auth/callback
http://localhost:3000/auth/callback
http://northwind.dev/auth/callback
https://*.preview.northwind.dev/auth/callback`;

type LineIssue = { line: number; message: string };

function validate(raw: string) {
  const lines = raw.split("\n");
  const seen = new Set<string>();
  const issues: LineIssue[] = [];
  let valid = 0;

  lines.forEach((text, index) => {
    const value = text.trim();
    if (!value) return;
    const line = index + 1;
    if (value.includes("*")) {
      issues.push({ line, message: "Wildcards are not supported." });
      return;
    }
    let url: URL;
    try {
      url = new URL(value);
    } catch {
      issues.push({ line, message: "Not a valid URL." });
      return;
    }
    const isLocal = url.hostname === "localhost" || url.hostname === "127.0.0.1";
    if (url.protocol !== "https:" && !(isLocal && url.protocol === "http:")) {
      issues.push({ line, message: "Use https outside localhost." });
      return;
    }
    if (seen.has(value)) {
      issues.push({ line, message: "Duplicate of an earlier line." });
      return;
    }
    seen.add(value);
    valid += 1;
  });

  return { lineCount: lines.length, issues, valid };
}

export default function Textarea12() {
  const id = useId();
  const [urls, setUrls] = useState(initialUrls);
  const [saved, setSaved] = useState(false);

  const { lineCount, issues, valid } = validate(urls);
  const badLines = new Set(issues.map((issue) => issue.line));
  const hasIssues = issues.length > 0;

  return (
    <form
      className="flex w-full max-w-lg flex-col gap-2"
      onSubmit={(event) => {
        event.preventDefault();
        if (!hasIssues) setSaved(true);
      }}
    >
      <Label htmlFor={`${id}-urls`}>Allowed redirect URLs</Label>
      <p id={`${id}-hint`} className="text-sm text-muted-foreground">
        One URL per line. Sign-in only returns users to an exact match.
      </p>
      <div className="flex overflow-hidden rounded-lg border border-input transition-colors focus-within:border-ring focus-within:ring-3 focus-within:ring-ring/50 has-aria-invalid:border-destructive has-aria-invalid:ring-destructive/20 dark:bg-input/30">
        <div
          aria-hidden="true"
          className="shrink-0 border-r border-border bg-muted/50 py-2 font-mono text-xs leading-6 tabular-nums select-none"
        >
          {Array.from({ length: lineCount }, (_, index) => {
            const line = index + 1;
            return (
              <div
                key={line}
                className={
                  badLines.has(line)
                    ? "bg-destructive/10 px-2.5 text-right text-destructive"
                    : "px-2.5 text-right text-muted-foreground"
                }
              >
                {line}
              </div>
            );
          })}
        </div>
        <Textarea
          id={`${id}-urls`}
          value={urls}
          wrap="off"
          spellCheck={false}
          autoCapitalize="off"
          autoCorrect="off"
          aria-invalid={hasIssues || undefined}
          aria-describedby={`${id}-hint ${id}-issues`}
          onChange={(event) => {
            setUrls(event.target.value);
            setSaved(false);
          }}
          className="min-h-32 resize-none rounded-none border-0 bg-transparent font-mono text-xs leading-6 shadow-none focus-visible:ring-0 aria-invalid:ring-0 md:text-xs dark:bg-transparent"
        />
      </div>

      <div id={`${id}-issues`} aria-live="polite">
        {hasIssues ? (
          <ul className="flex flex-col gap-1 text-sm text-destructive">
            {issues.map((issue) => (
              <li key={issue.line} className="flex items-start gap-1.5">
                <CircleAlertIcon aria-hidden="true" className="mt-0.5 size-4 shrink-0" />
                <span>
                  <span className="font-medium tabular-nums">Line {issue.line}:</span>{" "}
                  {issue.message}
                </span>
              </li>
            ))}
          </ul>
        ) : (
          <p className="flex items-center gap-1.5 text-sm text-muted-foreground">
            <CircleCheckIcon aria-hidden="true" className="size-4 shrink-0 text-success" />
            {saved
              ? `Saved. ${valid} redirect ${valid === 1 ? "URL is" : "URLs are"} live.`
              : `${valid} ${valid === 1 ? "URL" : "URLs"} ready to save.`}
          </p>
        )}
      </div>

      <Button type="submit" className="mt-2 self-end" disabled={hasIssues || saved}>
        Save URLs
      </Button>
    </form>
  );
}

TSX
"use client";

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

import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import {
  Tabs,
  TabsContent,
  TabsList,
  TabsTrigger,
} from "@/components/ui/tabs";
import { Textarea } from "@/components/ui/textarea";

type Line = { number: number; kind: "context" | "add" | "remove"; code: string };

const diff: Line[] = [
  { number: 41, kind: "context", code: "export async function retry(fn, opts) {" },
  { number: 42, kind: "remove", code: "  const attempts = 3;" },
  { number: 42, kind: "add", code: "  const attempts = opts.attempts ?? 5;" },
  { number: 43, kind: "add", code: "  const delay = opts.delay ?? 200;" },
  { number: 44, kind: "context", code: "  for (let i = 0; i < attempts; i++) {" },
];

const markers = { context: " ", add: "+", remove: "-" } as const;

type Comment = { id: number; line: number; body: string };

export default function Textarea13() {
  const id = useId();
  const [openLine, setOpenLine] = useState<number | null>(43);
  const [draft, setDraft] = useState(
    "Should `delay` back off exponentially? A flat 200ms will hammer the API when it's already struggling.",
  );
  const [comments, setComments] = useState<Comment[]>([]);

  const submit = () => {
    if (openLine === null || !draft.trim()) return;
    setComments((current) => [
      ...current,
      { id: current.length + 1, line: openLine, body: draft.trim() },
    ]);
    setDraft("");
    setOpenLine(null);
  };

  return (
    <div className="w-full max-w-xl overflow-hidden rounded-xl border border-border bg-card text-card-foreground">
      <div className="border-b border-border bg-muted/40 px-3 py-2 font-mono text-xs text-muted-foreground">
        src/lib/retry.ts
      </div>
      <div className="font-mono text-xs">
        {diff.map((line, index) => {
          const key = `${line.kind}-${line.number}-${index}`;
          const lineComments = comments.filter(
            (comment) => line.kind !== "remove" && comment.line === line.number,
          );
          const isOpen = line.kind !== "remove" && openLine === line.number;
          return (
            <div key={key}>
              <div
                className={
                  line.kind === "add"
                    ? "group flex items-stretch bg-success/10"
                    : line.kind === "remove"
                      ? "group flex items-stretch bg-destructive/10"
                      : "group flex items-stretch"
                }
              >
                <span className="w-10 shrink-0 py-1 pr-2 text-right text-muted-foreground tabular-nums select-none">
                  {line.number}
                </span>
                <span className="w-4 shrink-0 py-1 text-muted-foreground select-none">
                  {markers[line.kind]}
                </span>
                <code className="min-w-0 flex-1 overflow-x-auto py-1 pr-2 whitespace-pre">
                  {line.code}
                </code>
                {line.kind !== "remove" ? (
                  <Button
                    variant="ghost"
                    size="icon-xs"
                    aria-label={`Comment on line ${line.number}`}
                    aria-expanded={isOpen}
                    onClick={() => setOpenLine(isOpen ? null : line.number)}
                    className="my-0.5 mr-1 sm:opacity-0 sm:group-hover:opacity-100 sm:focus-visible:opacity-100 sm:aria-expanded:opacity-100"
                  >
                    <MessageSquarePlusIcon aria-hidden="true" />
                  </Button>
                ) : null}
              </div>

              {lineComments.map((comment) => (
                <div
                  key={comment.id}
                  className="flex gap-2 border-y border-border bg-background px-3 py-3 font-sans"
                >
                  <Avatar size="sm">
                    <AvatarFallback>SK</AvatarFallback>
                  </Avatar>
                  <div className="min-w-0 text-sm">
                    <p className="font-medium">Sam Kowalski</p>
                    <p className="break-words whitespace-pre-wrap text-muted-foreground">
                      {comment.body}
                    </p>
                  </div>
                </div>
              ))}

              {isOpen ? (
                <div className="border-y border-border bg-background p-3 font-sans">
                  <Tabs defaultValue="write" className="gap-2">
                    <TabsList>
                      <TabsTrigger value="write">Write</TabsTrigger>
                      <TabsTrigger value="preview">Preview</TabsTrigger>
                    </TabsList>
                    <TabsContent value="write" className="flex flex-col gap-2">
                      <Label htmlFor={`${id}-comment`} className="sr-only">
                        Comment on line {line.number}
                      </Label>
                      <Textarea
                        id={`${id}-comment`}
                        value={draft}
                        onChange={(event) => setDraft(event.target.value)}
                        placeholder="Leave a comment. Wrap code in backticks."
                        className="min-h-20 text-sm md:text-sm"
                      />
                    </TabsContent>
                    <TabsContent value="preview">
                      <p className="min-h-20 rounded-lg border border-dashed border-border px-2.5 py-2 text-sm break-words whitespace-pre-wrap">
                        {draft.trim()
                          ? draft.split(/(`[^`]+`)/g).map((part, partIndex) =>
                              part.startsWith("`") && part.endsWith("`") ? (
                                <code
                                  // biome-ignore lint/suspicious/noArrayIndexKey: parts are positional
                                  key={partIndex}
                                  className="rounded bg-muted px-1 py-0.5 font-mono text-xs"
                                >
                                  {part.slice(1, -1)}
                                </code>
                              ) : (
                                part
                              ),
                            )
                          : "Nothing to preview."}
                      </p>
                    </TabsContent>
                  </Tabs>
                  <div className="mt-2 flex justify-end gap-2">
                    <Button
                      variant="ghost"
                      size="sm"
                      onClick={() => setOpenLine(null)}
                    >
                      Cancel
                    </Button>
                    <Button size="sm" disabled={!draft.trim()} onClick={submit}>
                      Add comment
                    </Button>
                  </div>
                </div>
              ) : null}
            </div>
          );
        })}
      </div>
    </div>
  );
}

TSX
"use client";

import { CheckIcon, CircleAlertIcon, CopyIcon, PlusIcon } from "lucide-react";
import { useId, useRef, useState } from "react";

import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

const source =
  "Hi {name}, invoice {invoiceId} for {amount} is due on {dueDate}. Pay online to keep your workspace active.";

const initialTranslation =
  "Hallo {name}, die Rechnung {invoiceId} über {betrag} ist am {dueDate} fällig. Bezahle online, damit dein Workspace aktiv bleibt.";

const PLACEHOLDER_PATTERN = /\{(\w+)\}/g;

function placeholdersIn(text: string) {
  return Array.from(text.matchAll(PLACEHOLDER_PATTERN), (match) => match[1]);
}

const required = placeholdersIn(source);

export default function Textarea14() {
  const id = useId();
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const [translation, setTranslation] = useState(initialTranslation);
  const [approved, setApproved] = useState(false);

  const found = placeholdersIn(translation);
  const missing = required.filter((name) => !found.includes(name));
  const unknown = [...new Set(found.filter((name) => !required.includes(name)))];
  const hasIssues = missing.length > 0 || unknown.length > 0 || !translation.trim();
  const lengthDelta = Math.round(
    ((translation.length - source.length) / source.length) * 100,
  );

  function update(value: string) {
    setTranslation(value);
    setApproved(false);
  }

  function insertPlaceholder(name: string) {
    const textarea = textareaRef.current;
    const token = `{${name}}`;
    const start = textarea?.selectionStart ?? translation.length;
    const end = textarea?.selectionEnd ?? translation.length;
    update(translation.slice(0, start) + token + translation.slice(end));
    // Restore the caret after React commits the new value.
    requestAnimationFrame(() => {
      textarea?.focus();
      textarea?.setSelectionRange(start + token.length, start + token.length);
    });
  }

  return (
    <form
      aria-labelledby={`${id}-key`}
      className="flex w-full max-w-lg flex-col gap-4 rounded-xl border border-border bg-card p-4 text-card-foreground sm:p-5"
      onSubmit={(event) => {
        event.preventDefault();
        if (!hasIssues) setApproved(true);
      }}
    >
      <div className="flex flex-wrap items-center justify-between gap-2">
        <h3 id={`${id}-key`} className="min-w-0 truncate font-mono text-sm font-medium">
          billing.invoice.due_reminder
        </h3>
        <Badge variant="outline">English to German</Badge>
      </div>

      <div className="flex flex-col gap-1.5">
        <div className="flex items-center justify-between gap-2">
          <p className="text-xs font-medium text-muted-foreground">Source (en-US)</p>
          <Button
            type="button"
            variant="ghost"
            size="xs"
            onClick={() => update(source)}
          >
            <CopyIcon aria-hidden="true" />
            Copy source
          </Button>
        </div>
        <p className="rounded-lg bg-muted px-3 py-2 text-sm leading-relaxed">{source}</p>
      </div>

      <div className="flex flex-col gap-2">
        <Label htmlFor={`${id}-translation`}>Translation (de-DE)</Label>
        <Textarea
          ref={textareaRef}
          id={`${id}-translation`}
          lang="de"
          value={translation}
          onChange={(event) => update(event.target.value)}
          aria-invalid={hasIssues || undefined}
          aria-describedby={`${id}-check`}
          className="min-h-24 leading-relaxed"
        />
        <fieldset className="flex min-w-0 flex-wrap items-center gap-1.5">
          <legend className="sr-only">Placeholders from the source</legend>
          {required.map((name) => {
            const present = found.includes(name);
            return (
              <Button
                key={name}
                type="button"
                variant="outline"
                size="xs"
                onClick={() => insertPlaceholder(name)}
                aria-label={
                  present
                    ? `Insert {${name}} again, already used`
                    : `Insert missing {${name}}`
                }
                className={
                  present
                    ? "font-mono text-muted-foreground"
                    : "border-destructive/50 font-mono text-destructive"
                }
              >
                {present ? (
                  <CheckIcon aria-hidden="true" className="text-success" />
                ) : (
                  <PlusIcon aria-hidden="true" />
                )}
                {`{${name}}`}
              </Button>
            );
          })}
        </fieldset>
      </div>

      <div
        id={`${id}-check`}
        aria-live="polite"
        className="flex flex-col gap-1 text-sm"
      >
        {missing.length > 0 ? (
          <p className="flex items-start gap-1.5 text-destructive">
            <CircleAlertIcon aria-hidden="true" className="mt-0.5 size-4 shrink-0" />
            Missing {missing.map((name) => `{${name}}`).join(", ")}. Click a
            placeholder to insert it at the cursor.
          </p>
        ) : null}
        {unknown.length > 0 ? (
          <p className="flex items-start gap-1.5 text-destructive">
            <CircleAlertIcon aria-hidden="true" className="mt-0.5 size-4 shrink-0" />
            {unknown.map((name) => `{${name}}`).join(", ")} is not in the source.
            Placeholder names must stay in English.
          </p>
        ) : null}
        {!hasIssues ? (
          <p className="text-muted-foreground">
            {approved
              ? "Approved. Ships with the next release."
              : "All placeholders match the source."}
          </p>
        ) : null}
        <p className="text-xs text-muted-foreground tabular-nums">
          {lengthDelta > 0
            ? `${lengthDelta}% longer than the source. Check it still fits the email preview.`
            : "Same length or shorter than the source."}
        </p>
      </div>

      <Button type="submit" className="self-end" disabled={hasIssues || approved}>
        Approve translation
      </Button>
    </form>
  );
}