InfoWindow on Marker using MarkerClusterer - html

Question

This is my html code. I've try anything to add an infowindow on the markers but it don't wanna work. My data is loading from the "Alle_Ortswahlen.page1.xml" file.
Do anyone have an idea how can I add infoWindow to each marker?
<script type="text/javascript">
google.load('maps', '3', {
other_params: 'sensor=false'
});
google.setOnLoadCallback(initialize);
function initialize() {
var stack = [];
var center = new google.maps.LatLng(48.136, 11.586);
var options = {
'zoom': 5,
'center': center,
'mapTypeId': google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), options);
GDownloadUrl("Alle_Ortswahlen.page1.xml", function(doc) {
var xmlDoc = GXml.parse(doc);
var markers = xmlDoc.documentElement.getElementsByTagName("ROW");
for (var i = 0; i < markers.length; i++) {
// obtain the attribues of each marker
var lat = parseFloat(markers[i].getAttribute("Field4"));
var lng = parseFloat(markers[i].getAttribute("Field6"));
var marker = new google.maps.Marker({
position : new google.maps.LatLng(lat, lng),
map: map,
title:"This is a marker"
});
stack.push(marker);
}
var mc = new MarkerClusterer(map,stack);
});
}
</script>

Answer 1

Before the for cycle, make an empty infowindow object.
var infowindow = new google.maps.InfoWindow();
Than in the for cycle, after the marker, add an event listener, like this:
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent("You might put some content here from your XML");
infowindow.open(map, marker);
}
})(marker, i));
There is some closure magic happening when passing the callback argument to the addListener method. If you are not familiar with it, take a look at here:
Mozilla Dev Center: Working with Closures
So, your code should look something like this:
google.load('maps', '3', {
other_params: 'sensor=false'
});
google.setOnLoadCallback(initialize);
function initialize() {
var stack = [];
var center = new google.maps.LatLng(48.136, 11.586);
var options = {
'zoom': 5,
'center': center,
'mapTypeId': google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), options);
var infowindow = new google.maps.InfoWindow();
GDownloadUrl("Alle_Ortswahlen.page1.xml", function(doc) {
var xmlDoc = GXml.parse(doc);
var markers = xmlDoc.documentElement.getElementsByTagName("ROW");
for (var i = 0; i < markers.length; i++) {
// obtain the attribues of each marker
var lat = parseFloat(markers[i].getAttribute("Field4"));
var lng = parseFloat(markers[i].getAttribute("Field6"));
var marker = new google.maps.Marker({
position : new google.maps.LatLng(lat, lng),
map: map,
title:"This is a marker"
});
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent("You might put some content here from your XML");
infowindow.open(map, marker);
}
})(marker, i));
stack.push(marker);
}
var mc = new MarkerClusterer(map,stack);
});
}

Answer 2

So what you need to do is add some code, inside your for-loop, associating an infowindow onclick event handler with each marker. I'm assuming you only want to have 1 infowindow showing at a time, i.e. you click on a marker, the infowindow appears with relevant content. If you then click on another marker, the first infowindow disappears, and a new one reappears attached to the other marker. Rather than having multiple infowindows all visible at the same time.
GDownloadUrl("Alle_Ortswahlen.page1.xml", function(doc) {
var xmlDoc = GXml.parse(doc);
var markers = xmlDoc.documentElement.getElementsByTagName("ROW");
// just create one infowindow without any content in it
var infowindow = new google.maps.InfoWindow({
content: ''
});
for (var i = 0; i < markers.length; i++) {
// obtain the attribues of each marker
var lat = parseFloat(markers[i].getAttribute("Field4"));
var lng = parseFloat(markers[i].getAttribute("Field6"));
var marker = new google.maps.Marker({
position : new google.maps.LatLng(lat, lng),
map: map,
title:"This is a marker"
});
// add an event listener for this marker
google.maps.event.addListener(marker , 'click', function() {
// assuming you have some content in a field called Field123
infowindow.setContent(markers[i].getAttribute("Field123"));
infowindow.open(map, this);
});
stack.push(marker);
}
var mc = new MarkerClusterer(map,stack);
});