jkuchar/MultipleFileUpload

/**
 * Form submitted callback.
 * @param {DOM Element} form
 * @param {Object} e
 * @param {jQuery Element} $submitBtn
 * @returns {Boolean}
 */
function formSubmitted(form, e, $submitBtn) {

    /**
     *     COMMON CODEBASE FOR ALL INTERFACES (matter of refactoring?)
     */

    if (!$submitBtn && form['nette-submittedBy']) {
        $submitBtn = $(form['nette-submittedBy']);
    }

    // Do not upload files if
    //    a) submit button not recognized
    //    b) 'cancel' button clicked
    if (!$submitBtn || $submitBtn.attr('formnovalidate') === '') {
        return true;
    }

    var abortXhr = false;
    function preventSubmission() {
        e.preventDefault();
        e.stopImmediatePropagation();
        abortXhr = true;
    }

    /**
     *     COMMON CODEBASE FOR ALL INTERFACES END
     */


    // automatically submit form after all files have been uploaded
    if (form.finito) {
        return true;
    }

    var multipleFileUploadFields = $('div.mfuplupload[id]', form);
    var uploadersInQueue = multipleFileUploadFields.length;
    if (uploadersInQueue > 0) {
        multipleFileUploadFields.each(function() {
            var uploader = jQuery(this).pluploadQueue(),
                queueSize = uploader.files.length,
                status = uploader.total;

            // prevent form submission while files are being uploaded
            if (uploader.state === plupload.STARTED) {
                preventSubmission();
                return; // continue;
            }

            // Upload already completed (triggered manually in Queue widget prior to this form submission)
            if (uploader.state === plupload.STOPPED && status.uploaded === queueSize && status.queued === 0) {
                uploadersInQueue--;
                return; // continue;
            }

            // start upload & submit form on completion
            var uploadCompleted = function() {
                if (uploadersInQueue === 0) {
                    form.finito = true;
                    // send form using submit button so it is included in request
                    // so form['submitButtonName']->isSubmittedBy() can be used in Nette form processing
                    $submitBtn.click();
                }
            };
            preventSubmission();
            uploader.bind('UploadComplete', function(uploader, files) {
                uploadersInQueue--;
                uploadCompleted();
            });
            uploader.start();
        });
    }
    return !abortXhr;
}