javascript - Cordova Geolocation --- Altitude Not Work -

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i using plugin geolocation of cordova , works , except altitude . problem or not possible have value ? plugin code , my:

var onsuccess = function (posizione) {     alert ('latitudine:' + position.coords.latitude + '\ n' +           'longitude:' + position.coords.longitude + '\ n' +           'altitudine:' + position.coords.altitude + '\ n' +           'precisione:' + position.coords.accuracy + '\ n' +           'altitude precisione:' + position.coords.altitudeaccuracy + '\ n' +           'intestazione:' + position.coords.heading + '\ n' +           'speed:' + position.coords.speed + '\ n' +           'timestamp:' + position.timestamp + '\ n'); };  // onerror callback riceve un oggetto positionerror // funzione onerror (errore) {     alert ('codice:' + error.code + '\ n' +           'messaggio:' + error.message + '\ n'); }  navigator.geolocation.getcurrentposition (onsuccess, onerror, {enablehighaccuracy: true});

i repeat , not work that.

the code works if data received satellite. before put minus recommend check availability of satellites , how code works data satellites. code:

app.positionwatchid = navigator.geolocation.watchposition(             function(result){                 app.alt = math.round(result.coords.altitude) || app.base_alt;                 app.setaltimetervalue(app.alt);             },             function(){},             {                 timeout: 30000,                 maximumage: 3000,                 enablehighaccuracy: true             }         );

work fine when satellites visible , recieved null if satellites invisible. getcurrentposition works also


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