Calendly modal on all hyperlinks with a class

add_action( 'wp_print_footer_scripts', function() {

	?>
	<script type="text/javascript">

		var calendly_links = document.querySelectorAll( '.calendly' );

		for( var i = 0; i < calendly_links.length; i ++ ) {
			calendly_links[i].addEventListener( 'click', e => {

				// Stop The Link
				e.preventDefault();

				// Load Calendly JS
				var calendly_js = document.createElement( "script" );
				calendly_js.setAttribute( "type", "text/javascript" );
				calendly_js.setAttribute(
					"src", "//assets.calendly.com/assets/external/widget.js"
				);
				calendly_js.onload = function() {
					Calendly.showPopupWidget(
						"https://calendly.com/websean/meeting"
					);
				};
				document.head.appendChild( calendly_js );

				// Load Calendly CSS
				var calendly_css = document.createElement( "link" );
				calendly_css.setAttribute( "rel", "stylesheet" );
				calendly_css.setAttribute( "type", "text/css" );
				calendly_css.setAttribute(
					"href", "//assets.calendly.com/assets/external/widget.css"
				);
				document.head.appendChild( calendly_css );

			} );

		}

	</script>
	<?php

} );