WPCF7 helper: make a checkbox label partially linking, WordPress shortcode

wpcf7-helper--link-checkbox-label.php

<?php
add_shortcode('label_link', 'label_link');
function label_link($atts, $content='') {
	$field = $text = $target = $href = false;
	extract( shortcode_atts( compact('field', 'text', 'target', 'href' ), $atts ) );

	if (!$field || !$text || !$href) {
		return false;
	}

	label_link_store($field, $text, $href, $target);
}

function label_link_store($field=null, $text=null, $href=null, $target=null) {
	static $store;
	if (!$store)
		$store = array();
	if ($field && $text && $href) {
		$store[$field] = compact('field', 'text', 'target', 'href' );
	}
	return $store;
}

add_action('wp_footer', 'label_link_script', 1000);
function label_link_script() {
	$store = label_link_store();
	if (!$store) {
		return;
	}

	?><script>
jQuery(document).ready(function(){
	var store = <?php print json_encode($store); ?> || {};
	for (var field in store) {
		var $field = jQuery("[name^='" + field + "']");
		var $label = jQuery("[for^='" + field + "']");
		if ($label.length == 0) {
			$label = $field.siblings(".wpcf7-list-item-label");
		}

		if ($label.length > 0) {
			var link = jQuery('<a/>');
			link.text(store[field].text);
			link.bind('click', function(e){e.stopPropagation();});
			link.attr('href', store[field].href);
			if (store[field].target) link.attr('target', store[field].target);
			$newLabel = jQuery('<span>' + $label.text().replace( store[field].text, link.get(0).outerHTML ) + '</span>');
			$label.empty().append( $newLabel );
		}
	}
});
</script><?php
}

Example use:
[checkbox checkbox-405 use_label_element "I accept the terms and conditions."][label_link field="checkbox-405" text="terms and conditions" href="http://some-page" target="_blank"]