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geoloc.js
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geoloc.js
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// Javascript for Geolocation handler page.
var itercount, watchid, lastupdate;
function show(msg) {
var out, err;
out = document.getElementById('output');
out.innerHTML = msg;
err = document.getElementById('error');
err.innerHTML = '';
}
function error(msg) {
var err = document.getElementById('error');
err.innerHTML = '<span class="error">' + msg + '</span><br>';
}
function map(lat, lon) {
var mapelem = document.getElementById('map');
mapelem.innerHTML = map_image(lat, lon);
}
function error_callback(err) {
switch (err.code) {
case err.PERMISSION_DENIED:
error('No permission to get location: ' + err.message);
break;
case err.POSITION_UNAVAILABLE:
error('Could not get location: ' + err.message);
break;
case err.TIMEOUT:
error('Network timeout: ' + err.message);
break;
default:
error('Unknown error: ' + err.message);
break;
}
}
// Check if Google Map image has been loaded.
function check_gmap_loaded() {
var gmap = document.getElementById('gmap');
if (gmap === null) {
// If Google Map image is not present at all, then this test is
// irrelevant anyway.
return true;
}
if (!gmap.complete) {
return false;
}
if (typeof gmap.naturalWidth !== "undefined" && gmap.naturalWidth === 0) {
return false;
}
return true;
}
function success_callback(pos) {
var lat, lon, now;
// Don't update too frequently.
now = (new Date()).getTime();
if (now - lastupdate < 2000) {
return;
}
if (!check_gmap_loaded() && (now - lastupdate < 10000)) {
// Allow up to 10 seconds for Google Map to finish loading.
return;
}
lastupdate = now;
itercount += 1;
lat = pos.coords.latitude;
lon = pos.coords.longitude;
show('<a class="button" href="/coords?geolat=' + encodeURIComponent(lat) +
'&geolong=' + encodeURIComponent(lon) + '">' +
conv_coords(lat, lon) + ' (' + itercount + ')</a>');
map(lat, lon);
}
function start() {
itercount = 0;
lastupdate = 0;
watchid = null;
if (navigator.geolocation) {
show('Detecting location...');
watchid = navigator.geolocation.watchPosition(
success_callback,
error_callback,
{
enableHighAccuracy: true,
maximumAge: 0
}
);
}
else {
error('Geolocation API not supported in this browser.');
}
}
function stop() {
if (watchid !== null) {
navigator.geolocation.clearWatch(watchid);
watchid = null;
}
}
window.onload = start;
window.onunload = stop;
// -- End --