script.js

function check(form) {
    if (form.userid.value == 'admin' && form.pwd.value == 'admin') {
        window.open('/serverIndex');
    } else {
        alert('Error Password or Username');
    }
}

function sub(obj) {
    var fileName = obj.value.split('\\\\');
    document.getElementById('file-input').innerHTML = '   ' + fileName[fileName.length - 1];
};

$('form').submit(function(e) {
    e.preventDefault();
    var form = $('#upload_form')[0];
    var data = new FormData(form);
    $.ajax({
        url: '/update',
        type: 'POST',
        data: data,
        contentType: false,
        processData: false,
        xhr: function() {
            var xhr = new window.XMLHttpRequest();
            xhr.upload.addEventListener('progress', function(evt) {
                if (evt.lengthComputable) {
                    var per = evt.loaded / evt.total;
                    $('#prg').html('progress: ' + Math.round(per * 100) + '%');
                    $('#bar').css('width', Math.round(per * 100) + '%');
                }
            }, false);
            return xhr;
        },
        success: function(d, s) {
            console.log('success!');
        },
        error: function(a, b, c) {}
    });
});