// This code assumes each file upload has a related DOM node



// set as data.context, which is true for the UI version:



$('#fileupload').bind('fileuploadsend', function (e, data) {



    // This feature is only useful for browsers which rely on the iframe transport:



    if (data.dataType.substr(0, 6) === 'iframe') {



        // Set PHP's session.upload_progress.name value:



        var progressObj = {



            name: 'PHP_SESSION_UPLOAD_PROGRESS',



            value: (new Date()).getTime()  // pseudo unique ID



        };



        data.formData.push(progressObj);



        // Start the progress polling:



        data.context.data('interval', setInterval(function () {



            $.get('progress.php', $.param([progressObj]), function (result) {



                // Trigger a fileupload progress event,



                // using the result as progress data:



                e = $.Event( 'progress', {bubbles: false, cancelable: true});



                $.extend(e, result);



                ($('#fileupload').data('blueimp-fileupload') ||



                    $('#fileupload').data('fileupload'))._onProgress(e, data);



            }, 'json');



        }, 1000)); // poll every second



    }



}).bind('fileuploadalways', function (e, data) {



    clearInterval(data.context.data('interval'));



});