javascript - Problem in getting the parseInt(data) return NaN -

i having peculiar problem getting integer ajax response. whenever call following code, parseint(data) returns nan despite data being string.

function(data)  //return information jquery's request             {                  $('#progress_container').fadein(100);   //fade in progress bar                   $('#progress_bar').width(data +"%");    //set width of progress bar based on $status value (set @ top of page)                 $('#progress_completed').html(parseint(data) +"%"); //display % completed within progress bar             } 

from looks of line:

$('#progress_completed').html(parseint(data) +"%"); 

it seems trying insert percentage html #progress_completed element. mentioned data string, why converting integer concatenating string (the % string)?

parseint(data) + "%" 

this statement above creates string. if data string, need be:

$('#progress_completed').html(data +"%"); 

i'd suggest adding console.log(data) check value of data first sure.