ajax download file with progress bar

download_progress

				var target = "file destination";
        // check compartibility
        // reset progress bar
				$('.progress-bar').css('width', '0%').attr('aria-valuenow', 0);    
				var xhr=new XMLHttpRequest();
				xhr.overrideMimeType('application/octet-stream');
				xhr.open('GET', target, true);
				xhr.responseType='arraybuffer';
				xhr.send();
				xhr.onprogress=function(e){
					var value = e.loaded + "";
					var prog = value[0] + value[1];
					// update progress bar
					$('.progress-bar').css('width', prog+'%').attr('aria-valuenow', prog);    
				};
				xhr.onload=function(){
				  // fill progress bar
					$('.progress-bar').css('width', '100%').attr('aria-valuenow', 100);    
 					var resArray=new Uint8Array(xhr.response);
					var blob=new Blob([resArray], {type: 'application/octet-stream'});
					// add href attribute to target link
					$("#readyLink").attr("href", URL.createObjectURL(blob));
				};
			}