HDQ Rich Custom Redirect and HDF Prefill

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// Automatically place a "Retry quiz" button to quiz results
function hd_results_after_content($quiz)
{
?>
    <p style="text-align: right;"><a href="<?php echo get_the_permalink(); ?>" id = "hdq_retry_link">Retry Quiz</a></p>
<?php
}
add_action("hdq_results_after_content", "hd_results_after_content", 10, 1);


function hdq_before_Rich($quizID)
{
?>
	<script type="text/javascript">
		/* modify these to reflect the IDs of your fields */
		const HDQ_HDF_FIELDS = [
			"hdf_text_feycq5",
			"hdf_email_2o23b5"
		];

		function hdq_custom_init_Rich() {
			const URLParams = new URLSearchParams(document.location.search);

			setTimeout(function() {
				// get data from URL
				let data = [];
				for (let i = 0; i < HDQ_HDF_FIELDS.length; i++) {
					data[HDQ_HDF_FIELDS[i]] = URLParams.get(HDQ_HDF_FIELDS[i]);
				}

				// if data exists, set the form
				for (let k in data) {
					if (data[k]) {
						document.getElementById(k).value = data[k];
					}
				}
			}, 1000); // give the form time to initialize			
		}

		function hdq_custom_submit_Rich() {
			const permalink = hdq_custom_submit_create_url(HDQ.VARS.quiz.permalink);
			document.getElementById("hdq_retry_link").setAttribute("href", permalink);

			// check the score. Only redirect is quiz score is 100%
			if (HDQ.VARS.hdq_score[0] != HDQ.VARS.hdq_score[1]) {
				HDQ.VARS.quiz.quiz_redirect_url = "";
			} else {
				const u = hdq_custom_submit_create_url(HDQ.VARS.quiz.quiz_redirect_url);
				HDQ.VARS.quiz.quiz_redirect_url = u;
			}
			return '{}'; // expects a JSON string to be returned
		}

		function hdq_custom_submit_create_url(url) {
			let u = new URL(url);
			let formData = HDF.VARS["hdf-" + hdq_srp_hdf].data;

			// create the URL paramaters
			for (let i = 0; i < HDQ_HDF_FIELDS.length; i++) {
				if (formData[HDQ_HDF_FIELDS[i]]) {
					u.searchParams.append(HDQ_HDF_FIELDS[i], formData[HDQ_HDF_FIELDS[i]].value);
				}
			}
			return u;
		}
	</script>
<?php
}
add_action('hdq_before', 'hdq_before_Rich');


// Tell HD Quiz to run custom JS functions on quiz completion
function hdq_submit_Rich($quizOptions)
{
	array_push($quizOptions->hdq_submit, "hdq_custom_submit_Rich");
	array_push($quizOptions->hdq_init, "hdq_custom_init_Rich");
	return $quizOptions;
}
add_action('hdq_submit', 'hdq_submit_Rich');