Hi @fanta00
You need to load the fields values first and save it in Javascript variables. It should be something like this:
<script type="text/javascript">
(function($){
$( document ).ready(function() {
var fieldPage_<?php echo $page; ?> = <?php echo get_field( "text_field", $page ); ?>;
});
})(jQuery);
</script>
You can also use AJAX to load the fields. These pages should give you more idea about it: http://api.jquery.com/jquery.ajax/, https://premium.wpmudev.org/blog/using-ajax-with-wordpress/.
I hope this helps.
