Works with any backend npm install Zero dependencies
onFileAdded Callback

Fires when a file passes validation and is added to the queue.

(function() {
    var logEl = document.getElementById('log');
    function log(m) { var d = document.createElement('div'); d.className='pkg-log-entry'; d.textContent=m; logEl.appendChild(d); logEl.scrollTop=logEl.scrollHeight; }
    new MultipleUpload('#demo', {
        uploadUrl: '/api/upload',
        multiple: true,
        autoUpload: false,
        onFileAdded: function(task, uploader) {
            log('Added: ' + task.fileName + ' (' + MultipleUpload.formatSize(task.fileSize) + ') - Queue: ' + uploader.tasks.length);
        }
    });
})();