here is working code, copy from my project
var btnfile = $("#btn_file"); var uploader = new ss.SimpleUpload({ button: btnfile, url: uploadUrl, name: 'uploadfile', allowedExtensions: ['jpg', 'jpeg', 'png', 'gif', 'mp4', 'pdf', 'doc', 'docx', 'zip'], responseType: 'json', maxSize: 2048, multiple: true, multipleSelect: true, autoSubmit: true, onSizeError: function () { this.removeCurrent(); alert("Size Error, 2Mb MAX"); }, onSubmit: function () { //this.removeCurrent(); }, onComplete: function (filename, response) { console.log('onComplete，' + filename); if (!response) { alert('upload failed'); return false; } alert('Upload OK'); //do something }, onError: function (filename, errorType, status, statusText, response, uploadBtn, fileSize) { alert(filename + '/' + errorType + '/' + status + '/' + statusText + '/' + response + '/' + uploadBtn + '/' + fileSize); } });