Error8: 404 With Redirect Countdown

A 404 page that does not wait for the visitor to act: a live countdown runs under the message and fires onRedirect when it reaches zero, with a cancel button that stops the timer for anyone who would rather stay.

Installation

Radix flavor

npx shadcn add "https://ui.beste.co/r/error8"

Base UI flavor

npx shadcn add "https://ui.beste.co/r-base/error8"

This installs the block to components/beste/block/error8.tsx, plus the button shadcn/ui primitive it uses for the manual and cancel actions.

Quick start

The installed file exports error8Demo alongside the block: the exact props behind the preview above. Spread it and the countdown runs immediately.

import { Error8, error8Demo } from "@/components/beste/block/error8";

export default function NotFound() {
  return <Error8 {...error8Demo} />;
}

Navigation is the caller's job, so wire onRedirect to your router:

"use client";

import { useRouter } from "next/navigation";
import { Error8 } from "@/components/beste/block/error8";

export default function NotFound() {
  const router = useRouter();

  return (
    <Error8
      code="404"
      heading="This page does not exist"
      description="We will take you somewhere useful unless you would rather stay."
      seconds={10}
      labels={{
        redirect: "Redirecting to the homepage in",
        seconds: "seconds",
        cancel: "Stay on this page",
        canceled: "Automatic redirect canceled.",
      }}
      action={{ label: "Go now", href: "/" }}
      onRedirect={() => router.push("/")}
    />
  );
}

Props

type Error8Labels = {
  redirect?: string;
  seconds?: string;
  cancel?: string;
  canceled?: string;
};

type ActionLink = {
  label: string;
  href: string;
};

Behavior notes

• The block never navigates on its own. It only calls onRedirect, so the caller decides between router.push, window.location, or nothing at all, and the preview above stays put.
• onRedirect fires exactly once. A ref guards the call, so re-renders and a handler whose identity changes cannot trigger a second redirect.
• Passing no seconds (or 0) disables the redirect entirely: the guard skips the call and the countdown never starts.
• Pressing cancel stops the timer permanently for that mount, swaps the countdown sentence for labels.canceled, and removes the cancel button, leaving only the manual action link.
• The countdown line is marked aria-live="polite", so screen readers hear the remaining time without the page stealing focus every second.