Invalid / Required Checkbox

Forms 10

About

A terms-and-conditions checkbox with an inline error message that appears when the form is submitted without accepting.

Built with React and Tailwind. Copy the prompt and paste it into Claude Code, Cursor or Lovable: your agent adds Invalid / Required Checkbox to your project and fits it to your theme.

Code

How Invalid / Required Checkbox is used: the demo's code. The component's own source comes with a free account.

Usage.tsx

"use client";

import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Field,
  FieldContent,
  FieldError,
  FieldLabel,
} from "@/components/ui/checkbox-11-utils/field";
import { toast } from "sonner";
import { Toaster } from "sonner";
import { useState } from "react";

function Checkbox11Demo() {
  const [accepted, setAccepted] = useState(false);
  const [invalid, setInvalid] = useState(true);

  function onSubmit(event: React.FormEvent) {
    event.preventDefault();
    if (!accepted) {
      setInvalid(true);
      return;
    }
    setInvalid(false);
    toast.success("Terms accepted");
  }

  return (
    <form onSubmit={onSubmit} className="flex w-full max-w-sm flex-col gap-4">
      <Field orientation="horizontal" data-invalid={invalid}>
        <Checkbox
          id="checkbox-11-terms"
          aria-invalid={invalid}
          checked={accepted}
          onCheckedChange={(value) => {
            const next = value === true;
            setAccepted(next);
            if (next) setInvalid(false);
          }}
        />
        <FieldContent>
          <FieldLabel htmlFor="checkbox-11-terms">
            I agree to the terms and conditions
          </FieldLabel>
          {invalid && (
            <FieldError>You must accept the terms to continue.</FieldError>
          )}
        </FieldContent>
      </Field>
      <Button type="submit" size="sm" className="self-start">
        Continue
      </Button>
    </form>
  );
}

export default function DefaultDemo() {
  return (
    <div className="flex min-h-64 w-full items-center justify-center p-6">
      <Checkbox11Demo />
      <Toaster />
    </div>
  );
}