Ajax file submit

form_file.js

$('form').submit(function(){
        event.preventDefault();
        var fd = new FormData($('.employee-file-form')[0]);
        var btn = $(this).find('.js-upload-field-employee');
        btn.button('loading');
        $.ajax({
            url: '/api/v3/upload_field_employees/',
            type: 'POST',
            data: fd,
            cache: false,
            contentType: false,
            processData: false,
            success: function(response){console.log(reponse);},
        }).always(function() {
            btn.button('reset');
        });
})