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Component

Confirmation Dialog

The proceed-or-cancel pattern as `role="alertdialog"`: a focused question, the safe action focused first, and the confirming action on the trailing edge.

  • Component
  • React
  • TSX
  • Tailwind CSS
  • MIT

What it does

Capabilities

  • Role=dialog semantics
  • Focus trap
  • Focus restoration
  • Scroll lock
  • Escape to close
  • Role=alertdialog
  • Safe action focused first
  • Aria-haspopup="dialog" trigger
  • Role="dialog" panel
  • Aria-modal when modal
  • Aria-labelledby + aria-describedby wiring
  • Focus trap while modal

Preview

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Install

Add to your project

terminal
npx devsnips add React/Components/Dialogs/dialog-confirmation
registry path: React/Components/Dialogs/dialog-confirmation

Source

Implementation

code.tsx 
import {
  createContext,
  useCallback,
  useContext,
  useEffect,
  useId,
  useRef,
  useState,
} from "react";
import { createPortal } from "react-dom";
import type {
  ButtonHTMLAttributes,
  HTMLAttributes,
  KeyboardEvent as ReactKeyboardEvent,
  MouseEvent as ReactMouseEvent,
  ReactNode,
  RefObject,
} from "react";

/**
 * DevSnips React Dialog — Confirmation.
 *
 * The shared dialog core composed as a confirmation: `role="alertdialog"`,
 * a focused question with a short description, the safe action first in the
 * DOM (it receives the initial focus), and the confirming action last.
 */

function cx(...parts: Array<string | false | null | undefined>): string {
  return parts.filter(Boolean).join(" ");
}

/* ------------------------------------------------------------------------ */
/* Module-level dialog stack + scroll lock                                   */
/* ------------------------------------------------------------------------ */

/**
 * Every open dialog registers its key here; the last entry is the top-most
 * dialog. Escape handling uses the stack so only the top-most dialog closes.
 */
const openDialogKeys: string[] = [];

let scrollLockCount = 0;
let previousOverflow = "";
let previousPaddingRight = "";

function lockScroll(): void {
  scrollLockCount += 1;
  if (scrollLockCount === 1) {
    previousOverflow = document.body.style.overflow;
    previousPaddingRight = document.body.style.paddingRight;
    const scrollbarWidth = window.innerWidth - document.documentElement.clientWidth;
    if (scrollbarWidth > 0) {
      document.body.style.paddingRight = `${scrollbarWidth}px`;
    }
    document.body.style.overflow = "hidden";
  }
}

function unlockScroll(): void {
  scrollLockCount -= 1;
  if (scrollLockCount === 0) {
    document.body.style.overflow = previousOverflow;
    document.body.style.paddingRight = previousPaddingRight;
  }
}

const FOCUSABLE_SELECTOR =
  'a[href], button:not([disabled]), input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex="-1"])';

/** Focusable elements inside `root` (excludes hidden / aria-hidden nodes). */
function focusableElements(root: HTMLElement): HTMLElement[] {
  return Array.from(root.querySelectorAll<HTMLElement>(FOCUSABLE_SELECTOR)).filter(
    (el) => !el.hasAttribute("disabled") && !el.hidden && el.getAttribute("aria-hidden") !== "true",
  );
}

const TRIGGER_CLASSES =
  "inline-flex h-9 max-w-full items-center justify-center gap-2 rounded-[var(--ds-radius-sm)] border border-[var(--ds-color-border)] bg-[var(--ds-color-surface)] px-3 text-sm font-medium leading-5 text-[var(--ds-color-foreground)] shadow-[var(--ds-shadow-xs)] transition-colors duration-150 ease-out hover:bg-[var(--ds-color-surface-hover)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:pointer-events-none disabled:opacity-50 motion-reduce:transition-none";
const OVERLAY_CLASSES = "fixed inset-0 z-40 bg-[var(--ds-color-overlay)]";
const CONTENT_CLASSES =
  "fixed left-1/2 top-1/2 z-50 flex max-h-[calc(100dvh-2rem)] w-[calc(100vw-2rem)] max-w-lg -translate-x-1/2 -translate-y-1/2 flex-col overflow-hidden rounded-[var(--ds-radius-md)] border border-[var(--ds-color-border)] bg-[var(--ds-color-surface-elevated)] shadow-[var(--ds-shadow-lg)] focus:outline-none";
const HEADER_CLASSES = "flex flex-col gap-1.5 px-5 pt-5";
const TITLE_CLASSES =
  "text-lg font-semibold leading-[1.35] tracking-[-0.01em] text-[var(--ds-color-foreground)]";
const DESCRIPTION_CLASSES = "text-sm leading-5 text-[var(--ds-color-muted-foreground)]";
const FOOTER_CLASSES =
  "flex flex-col-reverse gap-2 px-5 pb-5 pt-4 sm:flex-row sm:justify-end [&>button]:w-full sm:[&>button]:w-auto";
// One class constant per close-action kind — the kinds never rely on
// conflicting-utility overrides (Tailwind resolves conflicts by stylesheet
// order, not class order, so overrides of bg-*/border-* are unreliable).
const CLOSE_VARIANT_CLASSES: Record<DialogCloseVariant, string> = {
  outline: TRIGGER_CLASSES,
  primary:
    "inline-flex h-9 max-w-full items-center justify-center gap-2 rounded-[var(--ds-radius-sm)] border border-transparent bg-[var(--ds-color-primary)] px-3 text-sm font-medium leading-5 text-[var(--ds-color-primary-foreground)] transition-colors duration-150 ease-out hover:bg-[color-mix(in_srgb,var(--ds-color-primary)_88%,#000)] active:bg-[color-mix(in_srgb,var(--ds-color-primary)_80%,#000)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:pointer-events-none disabled:opacity-50 motion-reduce:transition-none",
  destructive:
    "inline-flex h-9 max-w-full items-center justify-center gap-2 rounded-[var(--ds-radius-sm)] border border-transparent bg-[var(--ds-color-destructive)] px-3 text-sm font-medium leading-5 text-[var(--ds-color-destructive-foreground)] transition-colors duration-150 ease-out hover:bg-[color-mix(in_srgb,var(--ds-color-destructive)_88%,#000)] active:bg-[color-mix(in_srgb,var(--ds-color-destructive)_80%,#000)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:pointer-events-none disabled:opacity-50 motion-reduce:transition-none",
  ghost:
    "absolute right-3 top-3 inline-flex size-8 items-center justify-center rounded-[var(--ds-radius-sm)] text-[var(--ds-color-muted-foreground)] transition-colors duration-150 ease-out hover:bg-[var(--ds-color-surface-hover)] hover:text-[var(--ds-color-foreground)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:pointer-events-none disabled:opacity-50 motion-reduce:transition-none",
};

interface DialogContextValue {
  open: boolean;
  modal: boolean;
  contentId: string;
  titleId: string;
  descriptionId: string;
  hasTitle: boolean;
  hasDescription: boolean;
  registerTitle(): () => void;
  registerDescription(): () => void;
  rememberFocus(element: HTMLElement | null): void;
  requestOpen(next: boolean): void;
  requestClose(): void;
  triggerRef: RefObject<HTMLButtonElement>;
}

const DialogContext = createContext<DialogContextValue | null>(null);

function useDialog(component: string): DialogContextValue {
  const context = useContext(DialogContext);
  if (!context) {
    throw new Error(`<${component}> must be rendered inside <Dialog>.`);
  }
  return context;
}

/* ------------------------------------------------------------------------ */
/* Dialog (root)                                                             */
/* ------------------------------------------------------------------------ */

export interface DialogProps {
  /** Open state (controlled). */
  open?: boolean;
  /** Initial open state (uncontrolled). */
  defaultOpen?: boolean;
  /** Called whenever the dialog requests to open or close. */
  onOpenChange?: (open: boolean) => void;
  /**
   * Modal behavior (default true): overlay, scroll lock, focus trap, and
   * `aria-modal`. Set false for a non-modal floating panel (page stays
   * interactive; close on Escape or outside pointer down).
   */
  modal?: boolean;
  children?: ReactNode;
}

export function Dialog({
  open,
  defaultOpen = false,
  onOpenChange,
  modal = true,
  children,
}: DialogProps) {
  const [internalOpen, setInternalOpen] = useState(defaultOpen);
  const isControlled = open !== undefined;
  const actualOpen = isControlled ? open : internalOpen;
  const triggerRef = useRef<HTMLButtonElement>(null);
  const restoreFocusRef = useRef<HTMLElement | null>(null);
  const reactId = useId();
  const dialogKey = `ds-dialog${reactId}`;
  const contentId = `ds-dialog-content${reactId}`;
  const titleId = `ds-dialog-title${reactId}`;
  const descriptionId = `ds-dialog-description${reactId}`;
  const [hasTitle, setHasTitle] = useState(false);
  const [hasDescription, setHasDescription] = useState(false);

  const openRef = useRef(actualOpen);
  openRef.current = actualOpen;
  const requestOpen = useCallback(
    (next: boolean) => {
      // Remember the focused element at the moment the open is REQUESTED
      // (the trigger, or a row action). Capturing here — not in the open
      // effect — because mounted-child effects run before the root's, so by
      // effect time focus has already moved into the dialog.
      if (next && !openRef.current) {
        restoreFocusRef.current = document.activeElement as HTMLElement | null;
      }
      if (!isControlled) setInternalOpen(next);
      onOpenChange?.(next);
    },
    // eslint-disable-next-line react-hooks/exhaustive-deps
    [isControlled, onOpenChange],
  );
  const requestClose = useCallback(() => requestOpen(false), [requestOpen]);
  const requestCloseRef = useRef(requestClose);
  requestCloseRef.current = requestClose;

  const registerTitle = useCallback(() => {
    setHasTitle(true);
    return () => setHasTitle(false);
  }, []);
  const registerDescription = useCallback(() => {
    setHasDescription(true);
    return () => setHasDescription(false);
  }, []);

  // Fallback focus capture for opens that never pass through requestOpen
  // (e.g. a parent flipping controlled `open` directly): DialogContent calls
  // this from its open effect — the first code that moves focus — while the
  // pre-open focused element is still active.
  const rememberFocus = useCallback((element: HTMLElement | null) => {
    if (restoreFocusRef.current === null) {
      restoreFocusRef.current = element;
    }
  }, []);

  // While open: register on the dialog stack and lock body scroll (modal
  // only); on close restore focus to the trigger (or whatever was focused
  // when the dialog opened — captured in requestOpen).
  useEffect(() => {
    if (!actualOpen) return;
    openDialogKeys.push(dialogKey);
    if (modal) lockScroll();
    return () => {
      const index = openDialogKeys.indexOf(dialogKey);
      if (index !== -1) openDialogKeys.splice(index, 1);
      if (modal) unlockScroll();
      const element = restoreFocusRef.current;
      restoreFocusRef.current = null;
      if (element && element.isConnected) element.focus();
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [actualOpen, modal, dialogKey]);

  // Escape closes only the top-most open dialog (nesting-safe).
  useEffect(() => {
    if (!actualOpen) return;
    function onKeyDown(event: KeyboardEvent) {
      if (event.key === "Escape" && openDialogKeys[openDialogKeys.length - 1] === dialogKey) {
        event.preventDefault();
        requestCloseRef.current();
      }
    }
    document.addEventListener("keydown", onKeyDown);
    return () => document.removeEventListener("keydown", onKeyDown);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [actualOpen, dialogKey]);

  const value: DialogContextValue = {
    open: actualOpen,
    modal,
    contentId,
    titleId,
    descriptionId,
    hasTitle,
    hasDescription,
    registerTitle,
    registerDescription,
    rememberFocus,
    requestOpen,
    requestClose,
    triggerRef,
  };

  return <DialogContext.Provider value={value}>{children}</DialogContext.Provider>;
}

export default Dialog;

/* ------------------------------------------------------------------------ */
/* DialogTrigger                                                             */
/* ------------------------------------------------------------------------ */

export interface DialogTriggerProps extends ButtonHTMLAttributes<HTMLButtonElement> {
  children?: ReactNode;
}

export function DialogTrigger({ children, className, onClick, ...rest }: DialogTriggerProps) {
  const context = useDialog("DialogTrigger");

  function handleClick(event: ReactMouseEvent<HTMLButtonElement>) {
    onClick?.(event);
    if (event.defaultPrevented) return;
    if (context.open) {
      context.requestClose();
    } else {
      context.requestOpen(true);
    }
  }

  return (
    <button
      type="button"
      ref={context.triggerRef}
      aria-haspopup="dialog"
      aria-expanded={context.open}
      aria-controls={context.contentId}
      onClick={handleClick}
      className={cx(TRIGGER_CLASSES, className)}
      {...rest}
    >
      {children}
    </button>
  );
}

/* ------------------------------------------------------------------------ */
/* DialogContent (portal to document.body)                                   */
/* ------------------------------------------------------------------------ */

export interface DialogContentProps extends HTMLAttributes<HTMLDivElement> {
  children?: ReactNode;
}

export function DialogContent({ children, className, onKeyDown, ...rest }: DialogContentProps) {
  const context = useDialog("DialogContent");
  const contentRef = useRef<HTMLDivElement>(null);
  const open = context.open;

  // Move focus into the dialog on open: the first focusable element, or the
  // dialog container itself when it has no focusable children. This effect
  // is the first code that moves focus (child effects run before the root's
  // open effect), so it also captures the pre-open focused element for
  // externally-controlled opens that never passed through requestOpen.
  useEffect(() => {
    if (!open) return;
    const node = contentRef.current;
    if (!node) return;
    context.rememberFocus(document.activeElement as HTMLElement | null);
    const items = focusableElements(node);
    (items[0] ?? node).focus();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [open]);

  // Non-modal mode: an outside pointer down closes the dialog (modal closes
  // via its overlay instead).
  useEffect(() => {
    if (!open || context.modal) return;
    function onPointerDown(event: PointerEvent) {
      const node = contentRef.current;
      const target = event.target as Node;
      const trigger = context.triggerRef.current;
      if (node && !node.contains(target) && !(trigger && trigger.contains(target))) {
        context.requestClose();
      }
    }
    document.addEventListener("pointerdown", onPointerDown);
    return () => document.removeEventListener("pointerdown", onPointerDown);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [open, context.modal]);

  // Focus trap (modal only): wrap Tab / Shift+Tab at the first / last
  // focusable element. Skipped while focus lives inside a NESTED dialog —
  // the nested dialog traps its own keys.
  function handleKeyDown(event: ReactKeyboardEvent<HTMLDivElement>) {
    onKeyDown?.(event);
    if (event.defaultPrevented || event.key !== "Tab" || !context.modal) return;
    const node = contentRef.current;
    if (!node || !node.contains(document.activeElement)) return;
    const items = focusableElements(node);
    if (items.length === 0) {
      event.preventDefault();
      node.focus();
      return;
    }
    const first = items[0];
    const last = items[items.length - 1];
    if (event.shiftKey && document.activeElement === first) {
      event.preventDefault();
      last.focus();
    } else if (!event.shiftKey && document.activeElement === last) {
      event.preventDefault();
      first.focus();
    }
  }

  if (!open) return null;
  if (typeof document === "undefined") return null;

  return createPortal(
    <>
      {context.modal ? (
        <div
          aria-hidden="true"
          data-ds-dialog-overlay=""
          className={OVERLAY_CLASSES}
          // Canceling pointerdown suppresses the compatibility mousedown, so
          // the browser's default "focus the clicked surface" behavior never
          // steals focus from the trigger the close is about to restore.
          onPointerDown={(event) => {
            event.preventDefault();
            context.requestClose();
          }}
        />
      ) : null}
      <div
        ref={contentRef}
        id={context.contentId}
        role="dialog"
        aria-modal={context.modal ? true : undefined}
        aria-labelledby={context.hasTitle ? context.titleId : undefined}
        aria-describedby={context.hasDescription ? context.descriptionId : undefined}
        tabIndex={-1}
        onKeyDown={handleKeyDown}
        className={cx(CONTENT_CLASSES, className)}
        {...rest}
      >
        {children}
      </div>
    </>,
    document.body,
  );
}

/* ------------------------------------------------------------------------ */
/* DialogHeader / DialogTitle / DialogDescription                            */
/* ------------------------------------------------------------------------ */

export interface DialogHeaderProps extends HTMLAttributes<HTMLDivElement> {
  children?: ReactNode;
}

export function DialogHeader({ className, children, ...rest }: DialogHeaderProps) {
  return (
    <div className={cx(HEADER_CLASSES, className)} {...rest}>
      {children}
    </div>
  );
}

export interface DialogTitleProps extends HTMLAttributes<HTMLHeadingElement> {
  children?: ReactNode;
}

export function DialogTitle({ className, children, ...rest }: DialogTitleProps) {
  const context = useDialog("DialogTitle");
  // Register so DialogContent can wire `aria-labelledby` — and omit it when
  // no title is rendered (content then relies on an explicit `aria-label`).
  useEffect(() => context.registerTitle(), [context]);
  return (
    <h2 id={context.titleId} className={cx(TITLE_CLASSES, className)} {...rest}>
      {children}
    </h2>
  );
}

export interface DialogDescriptionProps extends HTMLAttributes<HTMLParagraphElement> {
  children?: ReactNode;
}

export function DialogDescription({ className, children, ...rest }: DialogDescriptionProps) {
  const context = useDialog("DialogDescription");
  // Register so DialogContent can wire `aria-describedby`.
  useEffect(() => context.registerDescription(), [context]);
  return (
    <p id={context.descriptionId} className={cx(DESCRIPTION_CLASSES, className)} {...rest}>
      {children}
    </p>
  );
}

/* ------------------------------------------------------------------------ */
/* DialogFooter / DialogClose                                                */
/* ------------------------------------------------------------------------ */

export interface DialogFooterProps extends HTMLAttributes<HTMLDivElement> {
  children?: ReactNode;
}

export function DialogFooter({ className, children, ...rest }: DialogFooterProps) {
  return (
    <div className={cx(FOOTER_CLASSES, className)} {...rest}>
      {children}
    </div>
  );
}

export type DialogCloseVariant = "outline" | "primary" | "destructive" | "ghost";

export interface DialogCloseProps extends ButtonHTMLAttributes<HTMLButtonElement> {
  /**
   * `outline` (default) is the bordered footer cancel action; `primary` /
   * `destructive` are confirming actions that also close; `ghost` is the
   * icon-sized corner close button (positioned top-right of the panel —
   * give it an `aria-label`).
   */
  variant?: DialogCloseVariant;
  children?: ReactNode;
}

export function DialogClose({ children, className, onClick, variant = "outline", ...rest }: DialogCloseProps) {
  const context = useDialog("DialogClose");

  function handleClick(event: ReactMouseEvent<HTMLButtonElement>) {
    onClick?.(event);
    if (event.defaultPrevented) return;
    context.requestClose();
  }

  return (
    <button
      type="button"
      onClick={handleClick}
      className={cx(CLOSE_VARIANT_CLASSES[variant], className)}
      {...rest}
    >
      {children}
    </button>
  );
}
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devsnips://components/dialogs/dialog-confirmation
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https://devsnips.site/library/react/components/dialogs/dialog-confirmation/

Install: npx devsnips add
React/Components/Dialogs/dialog-confirmation

This is the Confirmation Dialog — The proceed-or-cancel pattern as `role="alertdialog"`: a focused question, the safe action focused first, and the confirming action on the trailing edge.

Use this DevSnips resource as the starting point for my project.
Adapt it to my project's stack and conventions, fix any issues,
and make it production-ready while preserving its intended design
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Resource URI
devsnips://components/dialogs/dialog-confirmation