Parses current URL and uses the query parameters to replace them on an existing URL

parseUrlParams.js

/**
 * Parses current URL and uses the query parameters to
 * replace them on an existing URL of a CTA in the document.
 *
 * For example,
 * Current URL is: http://localhost:8000/?foobar=fromQuery#
 * <a
 * href="#"
 * data-url="http://foobar.com/?foobar=foobarValue&regulator=regulatorValue"
 * onclick="parseUrlAndInjectToCtaUrl(event)">Register here</a>
 *
 * Browser will redirect to http://foobar.com/?foobar=fromQuery&regulator=regulatorValue
 *
 * @param e
 */
function parseUrlAndInjectToCtaUrl(e) {
	let el = e.target
	let urlToParse = el.getAttribute('data-url')
	const targetUrl = new URL(urlToParse)

	let currentUrl = new URL(document.location.href)
	targetUrl.searchParams.forEach((value, key) => {
		let currentValue = currentUrl.searchParams.get(key)
		if (!currentValue) {
			return;
		}
		targetUrl.searchParams.set(key, currentValue)
	})

	window.location.href = targetUrl.toString()
}