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| // Validate if Google ReCaptcha library is loaded on window scope | |
| export function isReCaptchaReady () { | |
| return typeof window !== 'undefined' | |
| && typeof window.grecaptcha !== 'undefined' | |
| && typeof window.grecaptcha.render === 'function'; | |
| } | |
| // Dinamically inject a `script` tag and load Google ReCaptcha library | |
| export function injectRecaptchaScript() { | |
| const id = 'g-recaptcha-container'; | |
| const existing = document.getElementById(id); | |
| if (!existing) { | |
| const script = document.createElement("script"); | |
| script.id = id; | |
| script.async = true; | |
| script.defer = true; | |
| script.src = 'https://www.google.com/recaptcha/api.js'; | |
| document.body.appendChild(script); | |
| } | |
| } |
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| import React, { useState, useEffect } from 'react' | |
| import { useInterval } from './useInterval'; | |
| import { injectRecaptchaScript, isReCaptchaReady } from './g-recaptcha'; | |
| import './styles.css'; | |
| /** | |
| * Simple auto-loadable Google ReCaptcha component | |
| * | |
| * @param {object} component properties | |
| */ | |
| export function ReCaptcha({ sitekey, onVerify }){ | |
| const [ready, setReady] = useState(false); | |
| // Set interval to check Google ReCaptcha readiness status | |
| useInterval(addReCaptcha, ready ? null : 1000); | |
| useEffect(() => { | |
| // Set local function to global scope per Google Recaptcha requirements; | |
| window.onCaptchaCallback = onCaptchaCallback; | |
| // Unset when component unmounts | |
| return () => window.onCaptchaCallback = undefined; | |
| }, [ready]); | |
| // Dinamically Inject Google ReCaptcha script tag | |
| function addReCaptcha() { | |
| if (!isReCaptchaReady()) { | |
| injectRecaptchaScript(); | |
| } else { | |
| setReady(true); | |
| } | |
| } | |
| function onCaptchaCallback(response) { | |
| if (typeof onVerify === 'function') { | |
| onVerify(!!response); | |
| } | |
| } | |
| return ( | |
| <div | |
| className="g-recaptcha" | |
| data-sitekey={sitekey} | |
| data-callback="onCaptchaCallback" | |
| /> | |
| ); | |
| }; |
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| // Custom CSS | |
| .g-recaptcha > div { | |
| margin: 0 auto; | |
| } |
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| import { useEffect, useRef } from 'react'; | |
| // SetInterval workaround with Hooks by Dan Abramov: | |
| // https://overreacted.io/making-setinterval-declarative-with-react-hooks/ | |
| export function useInterval(callback, delay) { | |
| const savedCallback = useRef(); | |
| // Remember the latest callback. | |
| useEffect(() => { | |
| savedCallback.current = callback; | |
| }, [callback]); | |
| // Set up the interval. | |
| useEffect(() => { | |
| function tick() { | |
| savedCallback.current(); | |
| } | |
| if (delay !== null) { | |
| let id = setInterval(tick, delay); | |
| return () => clearInterval(id); | |
| } | |
| }, [delay]); | |
| } |
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