<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<link rel="stylesheet" href="https://ssl.gstatic.com/docs/script/css/add-ons.css">
<style>
form { margin: 40px auto; }
input { display:inline-block; margin: 20px; }
</style>
<script>
function uploadFile() {
document.getElementById('uploadFile').value = "Uploading File..";
google.script.run
.withSuccessHandler(fileUploaded)
.uploadFiles(document.getElementById("labnol"));
return false;
}
function fileUploaded(status) {
document.getElementById('labnol').style.display = 'none';
document.getElementById('output').innerHTML = status;
}
</script>
<form id="labnol">