javascript - Why is parseInt not working for me? -


no matter try nan when try parse input value variable. trying make calculator determine fuel economy. 

<!doctype html> <html>     <head>         <title>fuel calculator</title>         <meta charset="utf-8">         <meta http-equiv="x-ua-compatible" content="ie=edge,chrome=1">         <meta name="description" content="demo project">         <meta name="viewport" content="width=device-width, initial-scale=1">         <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">         <link rel="stylesheet" href="style.css">         <style type="text/css"></style>     </head>     <body>         <div class="wrapper">             <h1>fuel usage</h1>             <div class="row">                 <div class="col-md-12">                          <form>                           <div class="form-group">                             <label>miles driven per year</label>                             <input type="text" class="form-control" id="mpy">                           </div>                           <div class="form-group">                             <label>mpg</label>                             <input type="text" class="form-control" id="mpg">                           </div>                            <p>gallons used: <span id="used"></span</p>                           <div class="form-group">                            </div>                 <button id="submit" type="submit" class="btn btn-default">submit</button>                          </form>                 </div>                    </div>                 </div>              </div>         </div>         <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>         <script src="main.js" type="text/javascript"></script>     </body>  </html>

js file

var mpy = parseint($('#mpy').val(), 10); var mpg = parseint($('#mpg').val(), 10); var gallonsused = mpy/mpg;  $('#submit').click(function(){       $('#used').text(gallonsused); });

since have input fields declared globally, initial value in text value empty. result of parseint give nan value.
need calculate parsed values once invoke click event.

$('#submit').click(function(e){       var mpy = parseint($('#mpy').val(), 10);     var mpg = parseint($('#mpg').val(), 10);     var gallonsused = mpy/mpg;     $('#used').text(gallonsused); });

working example : https://jsfiddle.net/dinomyte/b9bhs4s3/


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