Question

I am having a peculiar problem with getting an integer from an ajax response. Whenever I call the following code, parseInt(data) returns NaN despite data being a string.

function poll() {
    $.ajax({
      type: "GET",
      dataType: "html",
      url: 'images/normal/' + userId + '/' + saveCode + 'progress.txt',
      error: function() {poll();},
      success: function(data) {
        // Change the text
        $('#loading_text').html(data + '% complete');
        // Change the loading bar
        max = 357;
        current_percent = parseInt(data); // returns NaN
        $('loading_bar').width(Math.round(max * (current_percent / 100)));
        // Call the poll again in 2 seconds
        if (loaded != true)
            {
            setTimeout( poll, 2000);
            }
      }
    });
} 

In firebug, typeof(data) is string and data = “89” (or another number from 1-100) yet it still isn’t working. Any clues?

Answer 1

data="89"
typeof(data) //is string
typeof(+data) //is number

So you can also give it a try with Plus + sign, instead of using parseInt

A different with + sign and parseInt as far as I know is when you parse blank or whitespace strings, parseInt return NaN, and + returns 0