The index.html file, which contains an application that makes use of
the Geolocation API functionality is listed below.
<!DOCTYPE html>
<html>
<head>
<title>Geolocation API sample</title>
<link rel="stylesheet" href="../assets/style.css" type="text/css" media="all"/>
<script src="https://maps.googleapis.com/maps/api/js"></script>
<script src="main.js"></script>
<style>
#map-canvas {
width: *;
height: 200px;
}
</style>
<script type="text/javascript">
window.onLaunchboxLoaded = function() {
console.log('API Loaded');
console.log('Build: ' + window.launchbox.Container.version);
console.log('OS: ' + window.launchbox.Container.osName + ' '
+ window.launchbox.Container.osVersion);
console.log('Network: ' + window.launchbox.Container.networkStatus.type);
window.launchbox.SplashScreen.hide();
};
function printText(str) {
var d = document.getElementById('results');
d.innerHTML += "<br/>" + str;
d.scrollTop = d.scrollHeight;
}
function clearText() {
var d = document.getElementById('results');
d.innerHTML = "";
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<header>
<h3><span>w3c geolocation api example</span>
</h3>
</header>
<div class="title">This Application demonstrates the use of w3c geolocation
API.</div>
<table width="100%">
<tr>
<td width="50%" style="border-right: 1px solid;" align="center">
<div id="defaultAccuracy" onclick="setHighAccuracy(false);"
class="text-bold">DEFAULT ACCURACY</div>
</td>
<td width="50%" align="center">
<div id="highAccuracy" onclick="setHighAccuracy(true);">HIGH ACCURACY</div>
</td>
</tr>
<tr>
<td width="50%" style="border-right: 1px solid;" align="center">
Maximum age
</td>
<td width="50%" align="center">
<input type="text" id="maximumAge" />
</td>
</tr>
<tr>
<td width="50%" style="border-right: 1px solid;" align="center">
Timeout
</td>
<td width="50%" align="center">
<input type="text" id="timeout" />
</td>
</tr>
</table>
<div style="display: block; padding: 10px;">
<input type="button" onclick="getCurrentPosition();" value="Get current position" />
<input type="button" id="watchPosition" onclick="watchPosition();"
value="Start watching" />
<input type="button" id="stopWatching" onclick="stopWatching();"
value="Stop watching" disabled />
<input type="button" onclick="saveResults();" value="Save results to csv" />
</div>
<div style="padding: 10px;margin-top:-20px;">
<input type="button" onclick="clearText();" value="Clear all text"/>
</div>
<div id="map-canvas"></div>
<div id="results"></div>
</body>
</html>The contents of the main.js file containing JavaScript used by the
above application are listed below:
var enableHighAccuracy = false;
var maximumAge = 0;
var timeout = 9999999;
var watchId = undefined;
var map;
var marker;
var polyline;
var results;
function initialize() {
var mapCanvas = document.getElementById('map-canvas');
var mapOptions = {
zoom: 14,
center: { lat: 50.2868200, lng: 19.1038500 }
};
map = new google.maps.Map(mapCanvas, mapOptions);
}
function setHighAccuracy(accuracy) {
enableHighAccuracy = accuracy;
if (accuracy) {
document.getElementById("highAccuracy").className = "text-bold";
document.getElementById("defaultAccuracy").className = "";
} else {
document.getElementById("highAccuracy").className = "";
document.getElementById("defaultAccuracy").className = "text-bold";
}
}
function setLocationTimeout() {
var newTimeout = parseInt(document.getElementById("timeout").value);
if (!isNaN(newTimeout)) {
timeout = parseInt(newTimeout);
} else {
timeout = 9999999;
}
printText("Setting timeout: " + timeout);
}
function setMaxAge() {
var newMaxAge = parseInt(document.getElementById("maximumAge").value);
if (!isNaN(newMaxAge)) {
maximumAge = newMaxAge;
} else {
maximumAge = 0;
}
printText("Setting maximumAge: " + maximumAge);
}
function getCurrentPosition() {
setLocationTimeout();
setMaxAge();
var startTime = (new Date()).getTime();
window.navigator.geolocation.getCurrentPosition(
function(position) {
var endTime = (new Date()).getTime();
printText("Received current position in " + (endTime - startTime) + "ms:");
printText(stringifyPosition(position));
centerMap(position);
addMarker(position);
},
function(error) {
printText("Failed to retrieve current position:");
printText(JSON.stringify(error));
},
{
maximumAge: maximumAge,
timeout: timeout,
enableHighAccuracy: enableHighAccuracy
}
);
}
function watchPosition() {
setLocationTimeout();
setMaxAge();
document.getElementById("stopWatching").disabled = false;
document.getElementById("watchPosition").disabled = true;
startTracingRoute();
watchId = window.navigator.geolocation.watchPosition(
function(position) {
printText("Received watched position:");
printText(stringifyPosition(position));
centerMap(position);
addCoordinate(position);
addMarker(position);
},
function(error) {
printText("Failed to retrieve watched position:");
printText(JSON.stringify(error));
},
{
maximumAge: maximumAge,
timeout: timeout,
enableHighAccuracy: enableHighAccuracy
}
);
}
function stopWatching() {
if (watchId !== undefined) {
window.navigator.geolocation.clearWatch(watchId);
printText("Clearing watch with id " + watchId);
}
document.getElementById("stopWatching").disabled = true;
document.getElementById("watchPosition").disabled = false;
}
function centerMap(position) {
var center = { lat: position.coords.latitude, lng: position.coords.longitude };
map.panTo(center);
}
function addMarker(position) {
if (marker !== undefined) {
marker.setMap(null);
}
marker = new google.maps.Marker({
position: { lat: position.coords.latitude, lng: position.coords.longitude },
map: map,
title: 'Your position'
});
}
function addCoordinate(position) {
polyline.getPath().push(new google.maps.LatLng(position.coords.latitude,
position.coords.longitude));
results.push(position.coords.latitude + "," + position.coords.longitude
+ "," + position.coords.accuracy +"\n");
}
function startTracingRoute() {
results = [];
results.push("latitude,longitude,accuracy\n");
if (marker !== undefined) {
marker.setMap(null);
}
if (polyline !== undefined) {
polyline.setMap(null);
}
polyline = new google.maps.Polyline({
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 5
});
polyline.setMap(map);
}
function saveResults() {
var blob = new Blob(results, {type : "text/plain"});
var errorHandler = function (err) {
alert("Failed to save results to file");
};
var where;
if (window.launchbox.Container.osName == 'Android') {
where = LocalFileSystem.EXTERNAL;
} else {
where = Window.PERSISTENT;
}
requestFileSystem(where, 10 * 1024 * 1024/*10MB*/, function (fs) {
fs.root.getFile(
'geolocation-results' + (new Date()).getTime() + '.csv',
{ 'create': true },
function (fileEntry) {
var writer = fileEntry.createWriter();
writer.write(blob);
writer.onwrite = function () {
alert("Saved results as " + fileEntry.toURL());
};
writer.onerror = function () {
alert("Failed to save results to file");
}
}, errorHandler);
}, errorHandler);
}
function stringifyPosition(position) {
// You cannot log native position object in Safari with JSON.stringify.
// It must be converted to pojo first, because properties are implemented
// on the prototype, not the object itself.
var pojo = {
timestamp: position.timestamp,
coords: {
accuracy: position.coords.accuracy,
altitude: position.coords.altitude,
altitudeAccuracy: position.coords.altitudeAccuracy,
heading: position.coords.heading,
latitude: position.coords.latitude,
longitude: position.coords.longitude,
speed: position.coords.speed
}
};
return JSON.stringify(pojo, null, 4);
}The contents of the cache manifest file called manifest.appcache for
this application are listed below:
CACHE MANIFEST CACHE: index.html main.js ../assets/pega-header.png ../assets/style.css NETWORK: *