javascript - Stuck at parse coordinates with button -


i'm working code of first answer from: phonegap compass , gps coordinates

i try make don't need put time lat , lon.

for i'm making button current position, , send program work. here don't know how continue, tryed dozen of times , i'm stuck because don't know lot of javascript/jquery.

any can me how need make button , send coordinates program?

here version of program:

<!doctype html> <html> <head>     <meta charset="utf-8" />     <meta name="viewport" content="width=device-width, initial-scale=1">     <title>compass test</title>      <script type="text/javascript" src="phonegap.js"></script>      <script type="text/javascript" src ="jquery-1.7.1.min.js">//</script> <!--http://code.jquery.com/jquery-1.7.1.min.js -->     <script type="text/javascript" src ="latlon.js">//</script> <!-- based on http://www.movable-type.co.uk/scripts/latlong.html -->       <style type="text/css">         #error, #results{             display: none;         }          #arrow{             position: absolute;             width: 30px;             height: 30px;             background: 50% 50% no-repeat;              background-size: 30px 30px;             background-image: url('arrow.png');             top: 0;             left: 50%;             margin: 30px 0 0 -15px;         }          #results .text{             margin-top: 100px;         }     </style>      <script type="text/javascript" >         var destinationposition;         var destinationbearing;          var positiontimerid;         var currentposition;         var prevposition;         var prevpositionerror;                var compasstimerid;         var currentheading;         var prevheading;         var prevcompasserrorcode;          $(document).on("deviceready", function() {             minpositionaccuracy = 50; // minimum accuracy in metres accept reliable position             minupdatedistance = 1; // minimum number of metres move before updating distance destination              $targetlat = $('#target-lat');             $targetlon = $('#target-lon');             $error = $('#error');                        $results = $('#results');             $distance = $('#distance');             $bearing = $('#bearing');             $heading = $('#heading');             $difference = $('#difference');             $arrow = $('#arrow');              document.getelementbyid('#target-lat').value('48');             document.getelementbyid('#target-lon').value('-1');              watchposition();                         watchcompass();                // set destination             $targetlat.change(updatedestination);             $targetlon.change(updatedestination);             updatedestination();          });          function watchposition(){             if(positiontimerid) navigator.geolocation.clearwatch(positiontimerid);              positiontimerid = navigator.geolocation.watchposition(onpositionupdate, onpositionerror, {                 enablehighaccuracy: true,                 timeout: 1000,                 maxiumumage: 0             });         }          function watchcompass(){             if(compasstimerid) navigator.compass.clearwatch(compasstimerid);             compasstimerid = navigator.compass.watchheading(oncompassupdate, oncompasserror, {                 frequency: 100 // update interval in ms             });         }          function onpositionupdate(position){             if(position.coords.accuracy > minpositionaccuracy) return;              prevposition = currentposition;             currentposition = new latlon(position.coords.latitude, position.coords.longitude);              if(prevposition && prevposition.distanceto(currentposition)*1000 < minupdatedistance) return;              updatepositions();         }          function onpositionerror(error){             watchposition();              if(prevpositionerror && prevpositionerror.code == error.code && prevpositionerror.message == error.message) return;               $error.html("error while retrieving current position. <br/>error code: " + error.code + "<br/>message: " + error.message);              if(!$error.is(":visible")){                 $error.show();                 $results.hide();             }              prevpositionerror = {                 code: error.code,                 message: error.message             };         }          function oncompassupdate(heading){             prevheading = currentheading;             currentheading = heading.trueheading >= 0 ? math.round(heading.trueheading) : math.round(heading.magneticheading);              if(currentheading == prevheading) return;              updateheading();         }          function oncompasserror(error){             watchcompass();              if(prevcompasserrorcode && prevcompasserrorcode == error.code) return;               var errortype;             switch(error.code){                 case 1:                     errortype = "compass not supported";                     break;                 case 2:                     errortype = "compass internal error";                     break;                 default:                     errortype = "unknown compass error";             }              $error.html("error while retrieving compass heading: "+errortype);              if(!$error.is(":visible")){                 $error.show();                 $results.hide();             }              prevcompasserrorcode = error.code;         }          function updatedestination(){             destinationposition = new latlon($targetlat.val(), $targetlon.val());             updatepositions();         }                  function updatepositions(){             if(!currentposition) return;              if(!$results.is(":visible")){                 $results.show();                 $error.hide();             }              destinationbearing = math.round(currentposition.bearingto(destinationposition));               $distance.html(math.round(currentposition.distanceto(destinationposition)*1000));                        $bearing.html(destinationbearing);              updatedifference();          }          function updateheading(){             $heading.html(currentheading);             updatedifference();         }          function updatedifference(){             var diff = destinationbearing - currentheading;             $difference.html(diff);                      $arrow.css("-webkit-transform", "rotate("+diff+"deg)");                  }          function locate(){             if (navigator.geolocation) {             var location_timeout = settimeout("geolocfail()", 10000);         navigator.geolocation.getcurrentposition(function(position) {         cleartimeout(location_timeout);         locationsuccess(position);     }, function(error) {         cleartimeout(location_timeout);         geolocfail();      });     }else{              showerror("your browser doesn't support geolocation!");          }     }  function locationsuccess(position) {     var lat = position.coords.latitude;     var lon = position.coords.longitude;      $('input[id=target-lat]').val(lat);     $('input[id=target-lon]').val(lon);      $targetlat.html(lat);     $targetlon.html(lon);      $targetlat.change(updatedestination);     $targetlon.change(updatedestination);     updatedestination(); }     </script> </head> <body>     <div id="results">         <div id="arrow"></div>         <div class="text">             <p>distance destination: <span id="distance"></span> metres</p>             <p>bearing destination: <span id="bearing"></span> degrees</p>             <p>current heading: <span id="heading"></span> degrees</p>                   <p>difference in heading , bearing: <span id="difference"></span> degrees</p>         </div>     </div>      <p id="error"></p>      <h2>destination</h2>     <div> <p>current latitude: <span id="target-lat"></span> </p>       </div>     <div> <p>current longitude: <span id="target-lon"></span> </p>       </div>     <br>     <button onclick="locate()">try it</button>  </body> </html>

but don't work, time in results says distance nan , arrow don't move.

else how can make saves position if close app?

sorry , help!

i guess added 

http://api.phonegap.com/1.0/geolocation

to config.xml?


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