Develop Reference

Google Maps API: Multiple GeoJson layers with MarkerClusterer + toggle

I have a problem with my GeoJson layers which I want to cluster (with MarkerClusterer) and then be able to show and hide them via checkboxes or similar. Therefore I tried something like the code below:
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(52.515696, 13.392624),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map"),
mapOptions);
var bounds = new google.maps.LatLngBounds();
var barLayer = new google.maps.Data();
var cafeLayer = new google.maps.Data();
barLayer.loadGeoJson('json/eat_drink/bar.geojson');
cafeLayer.loadGeoJson('json/eat_drink/cafe.geojson');
var markerClusterer = new MarkerClusterer(map);
var infowindow = new google.maps.InfoWindow();
markerClusterer.setMap(map);
function displayMarkers(layer) {
var layer = layer;
google.maps.event.addListener(layer, 'addfeature', function (e) {
if (e.feature.getGeometry().getType() === 'Point') {
var marker = new google.maps.Marker({
position: e.feature.getGeometry().get(),
title: e.feature.getProperty('name'),
map: map
});
// open the infoWindow when the marker is clicked
google.maps.event.addListener(marker, 'click', function (marker, e) {
return function () {
var myHTML = e.feature.getProperty('name');
infowindow.setContent("<div style='width:150px; text-align: center;'>"+myHTML+"</div>");
infowindow.setPosition(e.feature.getGeometry().get());
infowindow.setOptions({pixelOffset: new google.maps.Size(0,-30)});
infowindow.open(map, marker);
};
}(marker, e));
markerClusterer.addMarker(marker);
bounds.extend(e.feature.getGeometry().get());
map.fitBounds(bounds);
map.setCenter(e.feature.getGeometry().get());
}
});
layer.setMap(null);
google.maps.event.addListener(map, "click", function () {
infowindow.close();
});
};
document.getElementById('bar').onclick = function(){ // enable and disable markers
if(document.getElementById('bar').checked == true){
displayMarkers(barLayer);
}else{
return null;
}
};
}
Unfortunatley this doesn't work and I don't no exactly why.
If I remove the displayMarkers() function around the code and replace "layer" with the desired GeoJson layer, e.g. "barLayer", it works just fine.
Since I will end up with tons of GeoJason layers I would prefer a "compact" solution like this insted of copying the code multiple times. Have you guys any ideas how to do that properly?

I'm afraid I haven't done much more than refactor your code. Could you give this a try, and if it doesn't work specify exactly what doesn't work?
function displayMarkers(layer, map, markerClusterer) {
google.maps.event.addListener(layer, 'addfeature', function(e) {
if (e.feature.getGeometry().getType() === 'Point') {
var marker = new google.maps.Marker({
position: e.feature.getGeometry().get(),
title: e.feature.getProperty('name'),
map: map
});
// open the infoBox when the marker is clicked
google.maps.event.addListener(marker, 'click', function(e) {
var myHTML = e.feature.getProperty('name');
var infowindow = new google.maps.InfoWindow();
infowindow.setContent("<div style='width:150px; text-align: center;'>" + myHTML + "</div>");
infowindow.setPosition(e.feature.getGeometry().get());
infowindow.setOptions({
pixelOffset: new google.maps.Size(0, -30)
});
infowindow.open(map, marker);
google.maps.event.addListener(map, "click", function() {
infowindow.close();
});
});
markerClusterer.addMarker(marker);
var bounds = new google.maps.LatLngBounds();
bounds.extend(e.feature.getGeometry().get());
map.fitBounds(bounds);
map.setCenter(e.feature.getGeometry().get());
}
});
layer.setMap(null);
}
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(52.515696, 13.392624),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map"), mapOptions);
var barLayer = new google.maps.Data();
var cafeLayer = new google.maps.Data();
barLayer.loadGeoJson('json/eat_drink/bar.geojson');
cafeLayer.loadGeoJson('json/eat_drink/cafe.geojson');
var markerClusterer = new MarkerClusterer(map);
markerClusterer.setMap(map);
document.getElementById('bar').onclick = function() { // enable and disable streetViewControl
if (document.getElementById('bar').checked == true) {
displayMarkers(barlayer, map, markerClusterer);
} else {
return null;
}
};
}

Googlemaps API loads slow with many markers

Im trying to load around 600 googlemap markers on page load using the function addMarker.
The page takes a lot of time to load.
Is there anything I can do to make it load faster while keep using the addMarker function?
Thanks.
var map
var myLatlng = new google.maps.LatLng(35.9531719,14.3712201);
var markerBounds = new google.maps.LatLngBounds();
var markers = {};
function HomeControl(controlDiv, map)
{
google.maps.event.addDomListener(zoomout, "click", function() {
var currentZoomLevel = map.getZoom();
if(currentZoomLevel != 0)
{
map.setZoom(currentZoomLevel - 1);
}
});
google.maps.event.addDomListener(zoomin, "click", function() {
var currentZoomLevel = map.getZoom();
if(currentZoomLevel != 21)
{
map.setZoom(currentZoomLevel + 1);
}
});
}
function initialize()
{
var googleMapOptions = {
center: new google.maps.LatLng(35.9531719,14.3712201),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP,
zoomControl: false,
streetViewControl: false,
panControl: false,
draggable: true
};
map = new google.maps.Map(document.getElementById("map-canvas"), googleMapOptions);
google.maps.event.addListener(map, "idle", function() {
addMarker(latitude,longitude,id,'Title','url');
});
var homeControlDiv = document.createElement("div");
var homeControl = new HomeControl(homeControlDiv, map);
}
var infowindow = new google.maps.InfoWindow({
content: ""
});
function addMarker(lat,long,id,desc,url)
{
var myIcon = new google.maps.MarkerImage("/images/pips/"+id+".png", null, null, null, new google.maps.Size(28,38));
var myLatlng = new google.maps.LatLng(lat,long);
var marker = new google.maps.Marker({
map: map,
title: desc,
position: myLatlng,
icon: myIcon,
id: id
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent('' + desc + '');
infowindow.setPosition(marker.getPosition());
infowindow.open(map, marker);
});
markers[id] = marker;
markerBounds.extend(myLatlng);
google.maps.event.addListener(marker, "click", function() {
infowindow.open(map,marker);
});
}
google.maps.event.addDomListener(window, "load", initialize);
</script>

You can use clustering, it joins neighbor markers into one, and expand only on zoom
You can do clustering in client side, as well as server side, depending the amount of markers...
I would suggest to use server clustering if amount is more than 4000, otherwise client should look fine

Google Maps marker event listener is not working

Here is a link to my test example and the code which I am trying to figure out.
http://www.gaiser-vfx.com/media/maptest.html
<div id="googleMap">
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<script type="text/javascript" src="http://code.google.com/apis/gears/gears_init.js"></script>
<div id="map_canvas" style="width:100%; height:300px"></div>
<script>
var noLocation = new google.maps.LatLng(52.1307, -3.78371);
var initialLocation;
var browserSupportFlag = new Boolean();
var map;
var myOptions = {
zoom: 6,
draggable: true,
minZoom: 0,
maxZoom: 20,
disableDefaultUI: true,
zoomControl: true,
scrollwheel: true,
disableDoubleClickZoom: true,
mapTypeId: google.maps.MapTypeId.false
};
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
google.maps.event.addListener(map, 'bounds_changed', function() {
var center = map.getCenter();
var zoomLevel = map.getZoom();
$('#LocationLatitude').val(center.lat().toFixed(5));$('#LocationLongitude').val(center.lng().toFixed(5));$('#LocationZoom').val(zoomLevel);});
var poly
var path = new google.maps.MVCArray;
poly = new google.maps.Polygon({
strokeWeight: 3,
fillColor: '#5555FF'
});
poly.setMap(map);
poly.setPaths(new google.maps.MVCArray([path]));
google.maps.event.addListener(map, 'click', addPoint);
function addPoint(event) {
path.insertAt(path.length, event.latLng);
var marker = new google.maps.Marker({
position: event.latLng,
map: map,
draggable: true
});
markers.push(marker);
marker.setTitle("#" + path.length);
google.maps.event.addListener(marker, 'click', function() {
marker.setMap(null);
for (var i = 0, I = markers.length; i < I && markers[i] != marker; ++i);
markers.splice(i, 1);
path.removeAt(i);
});
google.maps.event.addListener(marker, 'dragend', function() {
for (var i = 0, I = markers.length; i < I && markers[i] != marker; ++i);
path.setAt(i, marker.getPosition());
}
);
}
</script>
`
This is the example I am trying to follow.
http://gmaps-samples-v3.googlecode.com/svn/trunk/poly/poly_edit.html
One of the main differences between my code and the example is the use of an initialize function call in the example while I am just trying to load mine when it loads the page. On my map test, I am able to place markers on the map and pick them up and move them, but the function on each marker that updates the poly to the new marker point and the ability to delete each marker does not seem to work.

It looks like all you have to do is declare a markers variable visible to the event listeners:
...
var markers = [];
var poly;
var path = new google.maps.MVCArray;
...

Google Maps api v3 - "Infowindow not defined" Error

The map comes up and the point appears. I have the title appearing as well. But as soon as I click on the marker to get info, nothing appears. Firebug info is below.
The information is being brought in via a database and there are multiple items; multiple markers are shown on the map as they should.
Any help would be apprecaited. Thanks..
Firebug Point Info:
MarkLat[i] = xx.xxxxxxxxxxxxxx;
MarkLong[i] = -xx.xxxxxxxxxxxxxx;
MarkerTitle[i] = 'Title 1';
Display[i] = '<table><tr><td>Title 1</td></tr><tr><td>Title 1 Address<br />Title 1 City, State Zip</td></tr><tr><td>Title 1 Phone</td></tr><tr><td>Title 1 Email</td></tr><tr><td>Title 1 URL</td></tr></table>';
Firebug Error:
infowindow is not defined
infowindow.open(map,marker);
Code:
<script type="text/javascript">
var i = -1;
var MarkLat=new Array();
var MarkLong=new Array();
var MarkerTitle=new Array();
var Display=new Array();
var MapCenter = new google.maps.LatLng(xx.xxxxxxxxxxxxxx,-xx.xxxxxxxxxxxxxx)
</script>
<script type="text/javascript">
var i = i + 1;
MarkLat[i] = [[Lat]];
MarkLong[i] = [[Long]];
MarkerTitle[i] = '[[Title]]';
Display[i] = '<table><tr><td>[[Title]]</td></tr><tr><td>[[Address]]<br />[[City]], [[State]] [[Zip]]</td></tr><tr><td>[[Phone]]</td></tr><tr><td>[[Email]]</td></tr><tr><td>[[WebURL]]</td></tr></table>';
</script>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
function initialize() {
var myOptions = {
zoom: 12,
center: MapCenter,
zoomControl: true,
zoomControlOptions: {
position: google.maps.ControlPosition.TOP_RIGHT,
style: google.maps.ZoomControlStyle.SMALL
},
mapTypeControl: true,
mapTypeControlOptions: {
style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
},
scaleControl: true,
scaleControlOptions: {
position: google.maps.ControlPosition.TOP_CENTER
},
mapTypeId: google.maps.MapTypeId.ROADMAP,
};
var map = new google.maps.Map(document.getElementById('map_canvas'),myOptions);
for (var i = 0, length = 50; i < length; i++) {
var latLng = new google.maps.LatLng(MarkLat[i],MarkLong[i]);
var infoWindow = new google.maps.InfoWindow(Display[i]);
// Creating a marker and putting it on the map
var marker = new google.maps.Marker({
position: latLng,
map: map,
title: MarkerTitle[i]
});
google.maps.event.addDomListener(marker, 'click', function() {
infowindow.open(map,marker);
});
}
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>

Changing to a capital W was not enough for me. Only one location was being opened. I tested your code with two points:
MarkLat = [];
MarkLong = [];
Display = [];
MarkerTitle= [];
MarkLat[0] = 0;
MarkLong[0] = 0;
Display[0] = { content: "hi" };
MarkerTitle[0] = "hello";
MarkLat[1] = 10;
MarkLong[1] = 10;
Display[1] = { content: "hi 2" };
MarkerTitle[1] = "hello 2";
I'm guessing you only want one InfoWindow on the screen at any given time. Then, a single InfoWindow should be declared, with the contents kept inside the marker, and have the contents change as the marker is clicked.
var infoWindow = new google.maps.InfoWindow();
for (var i = 0, length = Display.length; i < length; i++) {
var latLng = new google.maps.LatLng(MarkLat[i],MarkLong[i]);
// Creating a marker and putting it on the map
var marker = new google.maps.Marker({
position: latLng,
map: map,
title: MarkerTitle[i],
infoWindowContent: Display[i]
});
// Notice I used the 'this' keyword inside the listener
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(this.infoWindowContent.content);
infoWindow.open(map,this);
});
}
The alternative, having many InfoWindows pop up, needs a change to click listener, so that a reference to each individual InfoWindow is preserved. This effect is accomplished with an anonymous function wrapped around the infoWindow.open function (a new function scope is created).
for (var i = 0, length = Display.length; i < length; i++) {
var latLng = new google.maps.LatLng(MarkLat[i],MarkLong[i]);
var infoWindow = new google.maps.InfoWindow(Display[i]);
// Creating a marker and putting it on the map
var marker = new google.maps.Marker({
position: latLng,
map: map,
title: MarkerTitle[i]
});
google.maps.event.addListener(marker, 'click', (function(infoWindow) {
return function() {
infoWindow.open(map,this);
}
})(infoWindow));
}

infowindow != infoWindow
You just have declared it with a capital, trying to use it without

Multiple markers with infowindow

We using multiple marker with infowindow. Everything is working fine.
The issue is when we click marker, the infowindow opens but it doesn't close when click other markers. it stay opened. so can give solutions for this issue.
The code is in http://goo.gl/s0WZx
var berlin = new google.maps.LatLng(52.520816, 13.410186);
var neighborhoods = [
new google.maps.LatLng(52.511467, 13.447179),
new google.maps.LatLng(52.549061, 13.422975),
new google.maps.LatLng(52.497622, 13.396110),
new google.maps.LatLng(52.517683, 13.394393)
];
var markers = [];
var iterator = 0;
var map;
function initialize() {
var mapOptions = {
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: berlin
};
map = new google.maps.Map(document.getElementById("map_canvas"),
mapOptions);
}
function drop() {
for (var i = 0; i < neighborhoods.length; i++) {
setTimeout(function() {
addMarker();
}, i * 200);
}
}
function addMarker() {
var marker = new google.maps.Marker({
position: neighborhoods[iterator],
map: map,
draggable: false
});
markers.push(marker);
var contentString = $("#pop"+iterator).html();
var infowindow = new google.maps.InfoWindow({
content: contentString,
maxWidth: 300,
maxHeight: 500
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
iterator++;
}

You are creating as much infowindows, as there are markers. In your case,I think one infowindow is enough. So for working with only one infowindow, you could implement this on global scope:
//Using lazy initialization.
//InfoWindow will be created only after the first call
var getInfoWindow = (function(){
var _instance = null;
return function(){
if(_instance == null){
_instance = new google.maps.InfoWindow({
maxWidth: 300,
maxHeight: 500
});
}
return _instance;
};
})();
Also you need to store the contentString for every marker which must be shown on click event. So the final modification of addMarker method will be something like this:
function addMarker() {
var marker = new google.maps.Marker({
position: neighborhoods[iterator],
map: map,
draggable: false
});
markers.push(marker);
//Storing content html
marker.contentString = $("#pop"+iterator).html();
google.maps.event.addListener(marker, 'click', function() {
//Setting content of InfoWindow
getInfoWindow().setContent( marker.contentString );
//Opening
getInfoWindow().open(map,marker);
});
iterator++;
}

Put the var infowindow outside of the addMarker function. Like this:
var infowindow = new google.maps.InfoWindow();
Then inside your addMarker function use
infowindow.setContent(contentString);
This way the infowindow is only created once. Clicking on the different markers just moves the window and sets the content.