<form id="contactform" action="//ohfx.us13.list-manage.com/subscribe/post?u=5a708f75191cafb92ba257e97&amp;id=0c63dbcc52.php" name="contactform" method="post" data-scroll-reveal="enter from the bottom after 0.4s">
<div class="col-lg-4 col-md-4 col-sm-12 col-xs-12">
<input type="text" name="name" id="name" class="form-control" placeholder="NAME">
</div>
<div class="col-lg-4 col-md-4 col-sm-12 col-xs-12">
<input type="text" name="email" id="email" class="form-control" placeholder="EMAIL*">
</div>
<div class="col-lg-4 col-md-4 col-sm-12 col-xs-12">
<input type="text" name="subject" id="subject" class="form-control" placeholder="PHONE">
</div>
<div class="clearfix"></div>
<div class="text-center">
<button onclick="mySubmitFunction()" value="SEND" id="submit" class="btn btn-lg btn-contact btn-primary">SUBMIT</button>
</div>
</form> <!-- End Form -->

<script>

    function mySubmitFunction(evt){
        let form = new FormData(document.querySelector('#contactform')); //Agafa les dades de l'formulari
        var xhr = new XMLHttpRequest(); //crea un XMLHttpRequest
        xhr.open("POST","contact.php",true);    //connecta amb contact.php
        xhr.send(form); //envia les dades
        xhr.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                    console.log(this.responseText)// fes alguna cosa amb fethis.responseText;
            }
        };
        setTimeout(()=>{$('#contactform').submit()},300);


    }

</script>