Fileuploads via jquery

*.js

// Somewhere
(function ($) {
    $.fn.serializefiles = function () {
        var obj = $(this);
        /* ADD FILE TO PARAM AJAX */
        var formData = new FormData();
        $.each($(obj).find("input[type='file']"), function (i, tag) {
            $.each($(tag)[0].files, function (i, file) {
                formData.append(tag.name, file);
            });
        });
        var params = $(obj).serializeArray();
        $.each(params, function (i, val) {
            formData.append(val.name, val.value);
        });
        formData.append('ajax', true);
        return formData;
    };
})(jQuery);

// In ajax call
// Use .serializefiles() on form data usually data: $(this).serializefiles();
// Add option processData: false, to ajax call