Using the New DOM not outputting data

Using the New DOM not outputting data on the redirect page, just empty.

Old code:

on_sent_ok: “location.replace(‘/equity-release-calculations/?cli-nam=’+document.getElementById(“firstname”).value+’&age=’+document.getElementById(“age”).value+’&prop-val=’+document.getElementById(“propertyvalue”).value);”

DOM created in Functions.php:

* DOM event method for passing demo CF7 data */

add_action( ‘wp_footer’, ‘mycustom_wp_footer’ );

function mycustom_wp_footer() {
?>
<script type=”text/javascript”>
document.addEventListener( ‘wpcf7mailsent’, function( event ) {
location.replace(‘/equity-release-calculations/?cli-nam=’+document.getElementById(“firstname”).value+’&age=’+document.getElementById(“age”).value+’&prop-val=’+document.getElementById(“propertyvalue”).value);
}, false );
</script>
<?php
}

Help would be apprieciated
Regards
A