First of all I apologize for my poor English but I can not find the answer to my question on all French forums.
I am developing an application that is to make real-time tracking of a fleet of vehicles.
I'm at the end of this application but I have a problem. I can not update my markers without reloading my web page.
I tried with settimeout() but it still charging my map
here is my code thank you for your help.
ps: when completed this application will be available in open source
<html lang="fr">
<head>
<link rel="stylesheet" media="screen" type="text/css" title="Exemple" href="theme.css"/>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta charset="UTF-8" />
<title>Geonano V1</title>
<style type="text/css">
html{height: 100%}
body{height: 100%; margin: 0px; padding: 0px}
#EmplacementDeMaCarte{height: 100%}
</style>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
function initialisation() {
var tableauLieux = [
//here I have a loop in php to get my markers in my database
["Paris", 48.86110, 2.34459],
["Versailles", 48.78199, 2.11045]
];
var optionsCarte = {
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var maCarte = new google.maps.Map(document.getElementById("EmplacementDeMaCarte"), optionsCarte);
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < tableauLieux.length; i++) {
var Lieu = tableauLieux[i];
var pointLieu = new google.maps.LatLng(Lieu[1], Lieu[2]);
bounds.extend(pointLieu);
var marqueurLieu = new google.maps.Marker({
position: pointLieu,
map: maCarte,
title: Lieu[0],
icon : Lieu[3],
clickable: true
});
//création de l'info-bulle
var infoBulle = new google.maps.InfoWindow({
content: Lieu[0]//ici on peut mettre des balises HTML
});
google.maps.event.addListener(marqueurLieu, 'click', function() {
infowindow.setContent(Lieu[i][0]);
infoBulle .open(maCarte,marqueurLieu);
});
}
maCarte.fitBounds(bounds);
}
google.maps.event.addDomListener(window, 'load', initialisation);
setInterval("initialisation()", 5000);
</script>
</head>
<body>
<div id="EmplacementDeMaCarte"></div>
</body>
<META HTTP-EQUIV="Refresh" CONTENT="120; URL=http://localhost/geonano.php">
</html>
You'll have to request a ressource(may be a PHP-script) which returns the data for the markers(tableauLieux) using AJAX.
Once you got the response, remove the current markers and create the new markers.
If I understand it correctly, you're redrawing the map each 5 second with all the markers.
Bascily what you want to do is store your marker in an array that you can loop through at a later time to change their lat and lng. Clear them from the map, change the information and then put them back on the map. Changing the information is going to need some ajax.
marker.setMap(null);
a good way to do that is using something like
refreshIntervalId = setInterval("requestPoints()", 4000);
function requestPoints() {
$.ajax({
url:'{% url 'gpstracking.ajax.request_tracks' %}',
type: 'get',
dataType: 'json',
data: {
vehicles: vehicles
},
success: function (positions) {
updatePoints (positions);
}
});
}
function updatePoints (positions) {
console.debug('updating markers');
var lttd;
var lgtd;
for (var i=0; i < positions.length; i++) {
lttd = positions[i].latitude;
lgtd = positions[i].longitude;
position = map.createPosition({
lat: lttd,
lng: lgtd,
});
markers[positions[i].registration].setPosition(position);
};
if (positions.length > 1) {
//map.fitZoom();
} else {
map.setCenter (lttd, lgtd);
}
}
Related
I am using Google maps API v3, and this is my HTML file (mylocation.html) :
<!DOCTYPE html>
<html>
<head>
<title>Mylocation</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=true"></script>
<script>
var map;
function initialize() {
var mapOptions = {zoom: 6};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions)n);
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function (position) {
var pos = new google.maps.LatLng(position.coords.latitude,
position.coords.longitude);
var infowindow = new google.maps.InfoWindow({
map: map,
position: pos,
content: 'Location found using HTML5.'
});
map.setCenter(pos);
}, function () {
handleNoGeolocation(true);
});
} else {
// Browser doesn't support Geolocation
handleNoGeolocation(false);
}
}
function handleNoGeolocation(errorFlag) {
if (errorFlag) {
var content = 'Error: The Geolocation service failed.';
} else {
var content = 'Error: Your browser doesn\'t support geolocation.';
}
var options = {
map: map,
position: new google.maps.LatLng(60, 105),
content: content
};
var infowindow = new google.maps.InfoWindow(options);
map.setCenter(options.position);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>
When I open it on the Google Chrome, it works fine, and shows me my location.
In my project, I using WebVew to show this HTML file on Android. But when I run it, in LogCat, I get the following error:
"Uncaught TypeError: Cannot call method 'lat' of null at file:///mnt/sdcard/myloction.html:12"
(I have saved mylocation.html in the SDCard).
I'm not sure how to fix this? Could someone guide me with this?
To access Geolocation in the WebView, you need to do a bit of setup first.
You first must enable the feature in WebSettings: http://developer.android.com/reference/android/webkit/WebSettings.html#setGeolocationEnabled(boolean)
And you must also implement the WebChromeClient.onGeolocationPermissionsShowPrompt:
http://developer.android.com/reference/android/webkit/WebChromeClient.html#onGeolocationPermissionsShowPrompt(java.lang.String, android.webkit.GeolocationPermissions.Callback)
And please also ensure that your application has the appropriate Android permissions to access location.
I previously prepare a javascript that shows some marker downloaded in JSON format, from a webservice.
The code is:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>MAP</title>
<link type="text/css" href="css/style.css" rel="stylesheet" media="all" />
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&v=3.8"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript" src="map_bar.js"></script>
</head>
<body>
<h1>MAPPA</h1>
<div id="map"></div>
</body>
</html>
that calls the map_bar.js:
(function() {
window.onload = function() {
// Creating a new map
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(80.650535,41.886146),
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
// Creating a global infoWindow object that will be reused by all markers
function createPoints(json){
var infoWindow = new google.maps.InfoWindow();
// Looping through the JSON data
for (var i = 0, length = json.locations.length; i < length; i++) {
var data = json.locations[i],
latLng = new google.maps.LatLng(data.lat, data.long);
console.log(data.long);
var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
var marker = new google.maps.Marker({
position: latLng,
map: map,
title: data.nombre,
icon: 'beer.png'
});
(function(marker, data) {
// Attaching a click event to the current marker
google.maps.event.addListener(marker, "click", function() {
info = data.nombre+'<br/>'+data.offerta+'<br/>'+data.horario;
infoWindow.setContent(info); //esto escibe las info
infoWindow.open(map, marker);
});
})
(marker, data);
}
}
// Get the JSON data from PHP script
var json ;
$.getJSON("http://mywebservice.php").done(function(data) {
console.log(data);
json = data;
createPoints(json);
});
}
})();
It works, but the problem appears when I trying to integrate that in an existing webpage.
I have some sections and putting the same code in my "map section", the map appears but not markers.
The console.log(data) into the getJSON method not give back the point. It strange because the same code works in a "stand alone" page.
Any idea about that?
Thanks in advance.
jquery getJSON is subject to the same origin policy, a sub-domain is not the same domain as the main domain.
Using a relative reference to a file in the sub-domain fixes the issue.
I am able to run the google maps api to get the geo locations only on the firefox browser. It does not find the geo location on safari and Google crome. It fails stating geolocation service failed. Can some one tell me how I could make this geollocation example run on safari and google crome. I have got this example from google maps api V3
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="UTF-8">
<link href="http://code.google.com//apis/maps/documentation/javascript/examples/default.css" rel="stylesheet" type="text/css">
<script type="text/javascript"
src="http://maps.googleapis.com/maps/api/js?sensor=true"></script>
<script type="text/javascript">
var map;
function initialize() {
var myOptions = {
zoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map_canvas'),
myOptions);
// Try HTML5 geolocation
if(navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var pos = new google.maps.LatLng(position.coords.latitude,
position.coords.longitude);
var infowindow = new google.maps.InfoWindow({
map: map,
position: pos,
content: 'Location found using HTML5.'
});
map.setCenter(pos);
}, function() {
handleNoGeolocation(true);
});
} else {
// Browser doesn't support Geolocation
handleNoGeolocation(false);
}
}
function handleNoGeolocation(errorFlag) {
if (errorFlag) {
var content = 'Error: The Geolocation service failed.';
} else {
var content = 'Error: Your browser doesn\'t support geolocation.';
}
var options = {
map: map,
position: new google.maps.LatLng(60, 105),
content: content
};
var infowindow = new google.maps.InfoWindow(options);
map.setCenter(options.position);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map_canvas"></div>
</body>
</html>
Can some one tell me how I could make this geollocation example run on safari and google crome.
without knowing the versions, perhaps informing the browser to interpret the markup as html5 with
<!DOCTYPE html>
<html>
<head>
....
I copied following javascript code from google maps documentation, but it doesn't work, it only shows a white blank page, nothing loads.
<!DOCTYPE html>
<html>
<head>
<title>Google Maps JavaScript API v3 Example: Map Geolocation</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="UTF-8">
<!--
Include the maps javascript with sensor=true because this code is using a
sensor (a GPS locator) to determine the user's location.
See: http://code.google.com/apis/maps/documentation/javascript/basics.html#SpecifyingSensor
-->
<script type="text/javascript"
src="http://maps.googleapis.com/maps/api/js?sensor=true"></script>
<script type="text/javascript">
var map;
function initialize() {
var myOptions = {
zoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map_canvas'),
myOptions);
// Try HTML5 geolocation
if(navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var pos = new google.maps.LatLng(position.coords.latitude,
position.coords.longitude);
var infowindow = new google.maps.InfoWindow({
map: map,
position: pos,
content: 'Location found using HTML5.'
});
map.setCenter(pos);
}, function() {
handleNoGeolocation(true);
});
} else {
// Browser doesn't support Geolocation
handleNoGeolocation(false);
}
}
function handleNoGeolocation(errorFlag) {
if (errorFlag) {
var content = 'Error: The Geolocation service failed.';
} else {
var content = 'Error: Your browser doesn\'t support geolocation.';
}
var options = {
map: map,
position: new google.maps.LatLng(60, 105),
content: content
};
var infowindow = new google.maps.InfoWindow(options);
map.setCenter(options.position);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map_canvas"></div>
</body>
</html>
Since v3 require api key what's wrong with it? I checked in google chrome and firefox but no clue.
Looks like you are missing a closing html tag, unless that is a typo.
Add this </html> at the bottom of the page.
You need to provide a center location to create your map. In your initialize() function change the map options to include the location you want to start with:
var myCenter = new google.maps.LatLng(60.0,105.0);
var myOptions = {
zoom: 6,
center: myCenter,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
When (or if) you get a location from the geolocation service the center will be changed by your code.
Old question, will answer anyhow in case anyone else lands here.
I ended up using a slightly different implementation to get this to work:
<script type="text/javascript">
function initialize() {
var mapOptions = {zoom: 8, center: new google.maps.LatLng(-34.397, 150.644)};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
}
function loadScript() {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://maps.googleapis.com/maps/api/js?v=3.exp'+
'&key={{API_KEY}}&sensor=false&callback=initialize';
document.body.appendChild(script);
}
window.onload = loadScript();
</script>
The part that I had to add to get it to work from other (nearly identical) versions of this, was the () at the end of loadScript(). The implicit function call simply was not happening.
You will need to replace {{API_KEY}} with your own. I am not sure if this is required, but it was part of what led me to a working implementation.
If you do not have one, follow the steps listed here
I am using the code below to populate a Google Map with markers for all the lat and lng values I hold in a MySQL database.
What I would like to do, if at all possible, is to extend this a little more and have the ability to show different coloured markers dependent on a field value, to be more specific, if the value in the field 'finds' is zero then it will be one colour, but if it has a value of one or greater for it to be another colour.
I've found how to do this if the field value is a text value but not numeric. I've tried to change my code, to how (from a beginners perspective) I thought it might be be, but I can't get this to work.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>All Locations</title>
<link rel="stylesheet" href="css/style.css" type="text/css" media="all" />
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=false&language=en"></script>
<script type="text/javascript">
var customIcons = {
if 'finds'.value=0: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
},
else {
icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
}
};
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(54.312195845815246,-4.45948481875007),
zoom:6,
mapTypeId: 'roadmap'
});
// Change this depending on the name of your PHP file
downloadUrl("phphfile.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var name = markers[i].getAttribute("locationname");
var address = markers[i].getAttribute("address");
var findsvalue = markers[i].getAttribute("finds");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("osgb36lat")),
parseFloat(markers[i].getAttribute("osgb36lon")));
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
shadow: icon.shadow
});
}
});
}
function downloadUrl(url, callback) {
var request = window.ActiveXObject ?
new ActiveXObject('Microsoft.XMLHTTP') :
new XMLHttpRequest;
request.onreadystatechange = function() {
if (request.readyState == 4) {
request.onreadystatechange = doNothing;
callback(request, request.status);
}
};
request.open('GET', url, true);
request.send(null);
}
function doNothing() {}
</script>
</head>
<body onLoad="load()">
<div id="map"></div>
</body>
</html>
This was a lot simpler than I thought.
It was just a case of replacing the text with the numeric value.
Chris