javascript - How to show progress bar in percentage? -

how can show progress of upload on screen in percents? show bar starts 0% , output percentage percentcomplete variable. once upload completed see message completed in progress bar. if can provide examples appreciate that. thank you.

<div>select file upload:        <input type="file" id="fileupload" name="fileupload" onchange="fileupload()"/>     <span id="showbar"></span> </div> 

here jquery function:

function fileupload(){     var reader = new filereader();     var file = fileexist.files[0];      reader.onload = function(e) {         var text = reader.result.split(/\r\n|\n/);         var myform = new formdata(document.getelementbyid('myform'));                                 $.ajax({             /*start-progress bar code*/             xhr: function(){                 var xhr = new window.xmlhttprequest();                  xhr.upload.addeventlistener("progress", function(evt){                     if(evt.lengthcomputable){                         var percentcomplete = evt.loaded / evt.total;                         percentcomplete = parseint(percentcomplete * 100);                         console.log(percentcomplete);                          if(percentcomplete === 100){                             console.log("successfully uploaded!");                         }                     }                 },false);                 return xhr;                 },                 /*end*/                 type: 'post',                 url: 'fileupload.cfc?method=uploadfile',                 data: new formdata($('#myform')[0]),                 cache: false,                 contenttype: false,                 enctype: 'multipart/form-data',                 processdata: false,                 datatype: 'json'             }).done(function(obj){                 if(obj.status === 200){                     $('#myform')[0].reset();                 }else{                     alert('error!');                 }             }).fail(function(jqxhr, textstatus, errorthrown){                 alert(errorthrown);             })     }     reader.readastext(file, 'utf-8'); } 

have considered plupload? core example, simple textual percentage: http://www.plupload.com/examples/core