Grouping polygons - javascript

Grouping polygons - javascript

i have some project using polygon, i want to make some polygon with different fill color, but also i want to make it all in one group, i mean when i drag any polygon, the other one within same group get drag together, how i make that possible?
This is my code:
var marker;
var map;
var elevator;
var listenerHandle;
function initialize()
{
var mapOpt = {
center:new google.maps.LatLng(-8.664523972355582,115.2165412902832),
maxZoom:30,
zoom:14,
panControl:false,
zoomControl:false,
mapTypeControl:true,
mapTypeControlOptions: {
style: google.maps.MapTypeControlStyle.DROPDOWN_MENU,
position: google.maps.ControlPosition.BOTTOM_LEFT
},
scaleControl:true,
streetViewControl:false,
overviewMapControl:false,
rotateControl:false,
mapTypeId:google.maps.MapTypeId.HYBRID
};
map=new google.maps.Map(document.getElementById("map_pan"),mapOpt);
elevator = new google.maps.ElevationService();
var infoWindow = new google.maps.InfoWindow;
downloadUrl("addons/view/xml.php", function(data) {
var xml = data.responseXML;
var paths = xml.documentElement.getElementsByTagName("path");
for (var i = 0; i < paths.length; i++) {
var sitename = paths[i].getAttribute("sitename");
var koordinat = paths[i].getAttribute("koordinat");
var koor = koordinat.split(";");
var koorbts = paths[i].getAttribute("koorbts");
var warna = paths[i].getAttribute("color");
var latlng = [];
var polygon ="";
var html = sitename;
for (var j = 0; j<koor.length; j++){
var kordi = koor[j].split(",");
var lat = kordi[0];
var lng = kordi[1];
latlng[j] = new google.maps.LatLng(parseFloat(lat),parseFloat(lng));
}
polygon = new google.maps.Polygon({
map: map,
paths: latlng,
strokeColor: warna,
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: warna,
fillOpacity: 0.8,
draggable: true,
geodesic: true
});
bindInfoWindow(polygon, koorbts, map, infoWindow, html);
}
});
}
function bindInfoWindow(polygon, koorbts, map, infoWindow, html) {
google.maps.event.addListener(polygon, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map);
var kor = koorbts.split(",");
var lat = kor[0];
var lng = kor[1];
latlng = new google.maps.LatLng(parseFloat(lat),parseFloat(lng));
infoWindow.setPosition(latlng);
document.getElementById('x_lat').value = lat;
document.getElementById('y_lng').value = lng;
});
}
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() {}
function mapclick(){
google.maps.event.removeListener(listenerHandle);
listenerHandle = google.maps.event.addListener(map,'click',function(event){
if (!marker) {
marker = new google.maps.Marker({
position: event.latLng,
map: map,
draggable:true
});
}
else { marker.setPosition(event.latLng); }
updateMarkerPosition(marker.getPosition());
google.maps.event.addListener(marker, 'drag', function() {
updateMarkerPosition(marker.getPosition());});
});
}
function updateMarkerPosition(latLng) {
var floatlat = parseFloat(latLng.lat());
var floatLng = parseFloat(latLng.lng());
var latx = floatlat.toFixed(6);
var lngy = floatLng.toFixed(6);
$("#x_lat").val(latx);
$("#y_lng").val(lngy);
}
function deleteOverlays() {
google.maps.event.removeListener(listenerHandle);
marker.setMap(null);
marker="";
}
google.maps.event.addDomListener(window, 'load', initialize);

So what you're needing to do is to create a complex polygon. A "simple" polygon is basically your normal multi-sided closed shape. A "complex" polygon is interpreted by Google Maps as a 'single' shape, denoted as an array of simple polygons.
I am working on something similar where I allow the user to draw out multiple areas, but belong together as a simple entity. I know this is late, but to accomplish this, when you're creating your polygons, for each one, you can make use of the Polygon.setPaths() function which you should set up each Array as a simple closed polygon, so that the Polygon shape is comprised of multiple sets of simple paths.
Then, you can store and set that Polygon so that when you drag/color one of those simple polygons, all the rest in the same shape will be affected too.
Apologies for the late and abstract answer.

Related

Change map center in googlemap api

I want to change map center. my code is below.
var customIcons = {
restaurant: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png'
},
bar: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png'
}
};
function load() {
var point2=[];
// mark infowindow
downloadUrl("markinfoan.xml", 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("time");
var ss = markers[i].getAttribute("secspray");
var pd = markers[i].getAttribute("secdis");
var ms = markers[i].getAttribute("meanspray");
var td = markers[i].getAttribute("totaldis");
var tss = markers[i].getAttribute("totalsecspray");
var tst = markers[i].getAttribute("totalsectime");
var mpoint = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("latitude")),
parseFloat(markers[i].getAttribute("longitude")));
var html = "<b>" + "Time:"+ "</b>"+name +"<br/>" + "<b>" +"Spray:"+"</b>"+ss+"<br/>"+ "<b>" +"MeanSpray:"+"</b>"+ms+"<br/>"+ "<b>" +"TotalsectionSpray:"+"</b>"+tss+"<br/>"+ "<b>" +"Dis:"+"</b>"+pd+"<br/>"+ "<b>" +"Total dis:"+"</b>"+td+"<br/>"+ "<b>" +"Totaltime:"+"</b>"+tst+"<br/>";
var icon = customIcons[pd] || {};
var marker = new google.maps.Marker({
map: map,
position: mpoint,
icon: icon.icon
});
bindInfoWindow(marker, map, infoWindow, html);
}
});
//total route
downloadUrl("rec_an.xml", function(data) {
var point1 = [];
var xml1 = data.responseXML;
var markers1 = xml1.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers1.length; i++) {
point1[i] = new google.maps.LatLng(
parseFloat(markers1[i].getAttribute("latitude")),
parseFloat(markers1[i].getAttribute("longitude")));
}
var flightPath = new google.maps.Polyline({
path: point1,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 2.0,
strokeWeight: 4
});
flightPath.setMap(map);
});
// mark infowindow route
downloadUrl("markinfoan.xml", function(data) {
// var point2 = [];
var xml2 = data.responseXML;
var markers2 = xml2.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers2.length; i++) {
point2[i] = new google.maps.LatLng(
parseFloat(markers2[i].getAttribute("latitude")),
parseFloat(markers2[i].getAttribute("longitude")));
}
var flightPath = new google.maps.Polyline({
path: point2,
geodesic: true,
strokeColor: '#0066FF',
strokeOpacity: 2.0,
strokeWeight: 4
});
flightPath.setMap(map);
});
alert(point2);
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(point2[0]),
zoom: 12,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
}
function bindInfoWindow(marker, map, infoWindow, html) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}
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);
if (request.status === 200) {
alert("Total route, Infowindow");
alert(point2[0]);
} else {
alert('There was a problem with the request.');
}
}
};
request.open('GET', url, true);
request.send(null);
}
function doNothing() {}
//]]>
</script>
</head>
<body onload="load()">
<div id="map" style="width: 1000px; height: 800px"></div>
I want to change map center from (37.5,126.9) to point2[0].
point2[0] is a location recorded in xml file.
When I run my code, "alert(point2)" represent nothing. How can I fix it?
Thank you.

downloadUrl is an asynchronous request, you need to use the value of point2 in its callback function when it has a value.
downloadUrl("markinfoan.xml", function(data) {
var xml2 = data.responseXML;
var markers2 = xml2.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers2.length; i++) {
point2[i] = new google.maps.LatLng(
parseFloat(markers2[i].getAttribute("latitude")),
parseFloat(markers2[i].getAttribute("longitude")));
}
var flightPath = new google.maps.Polyline({
path: point2,
geodesic: true,
strokeColor: '#0066FF',
strokeOpacity: 2.0,
strokeWeight: 4
});
flightPath.setMap(map);
// set the map center inside the callback function, where point2 exists
map.setCenter(point2[point2.length-1]); // <-- add this sets the center of the map to the last point on the path
});

Google Maps: Select previous Marker on Polyline

I'm doing an application with google maps API that have a JSON with the marker's coordinates. Then I draw polylines between the markers. I also implemented a function with a onclick event that creates a new marker inside the polyline. This marker has to show information of the previous marker in the polyline (the one taked of the JSON, not a clicked one). But I don't know how to take the previous vertex(marker) of a selected polyline.
Code:
(function() {
window.onload = function() {
var options = {
zoom: 3,
center: new google.maps.LatLng(37.09, -95.71),
mapTypeId: google.maps.MapTypeId.HYBRID,
noClear: true,
panControl: true,
scaleControl: false,
streetViewControl:false,
overviewMapControl:false,
rotateControl:false,
mapTypeControl: true,
zoomControl: false,
};
var map = new google.maps.Map(document.getElementById('map'), options);
// JSON
$.getJSON("loc.js", function(json) {
console.log(json);
});
//Marker type
var markers = [];
var arr = [];
var pinColor = "FE7569";
var pinImage = new google.maps.MarkerImage("http://labs.google.com/ridefinder/images/mm_20_red.png" + pinColor,
new google.maps.Size(21, 34),
new google.maps.Point(0,0),
new google.maps.Point(10, 34));
// JSON loop
for (var i = 0, length = json.length; i < length; i++) {
var data = json[i],
latLng = new google.maps.LatLng(data.lat, data.lng);
arr.push(latLng);
// Create markers
var marker = new google.maps.Marker({
position: latLng,
map: map,
icon: pinImage,
});
infoBox(map, marker, data);
//Polylines
var flightPath = new google.maps.Polyline({
path: json,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2,
map:map
});
infoPoly(map, flightPath, data);
//Calculate polylines distance
google.maps.LatLng.prototype.kmTo = function(a){
var e = Math, ra = e.PI/180;
var b = this.lat() * ra, c = a.lat() * ra, d = b - c;
var g = this.lng() * ra - a.lng() * ra;
var f = 2 * e.asin(e.sqrt(e.pow(e.sin(d/2), 2) + e.cos(b) * e.cos
(c) * e.pow(e.sin(g/2), 2)));
return f * 6378.137;
}
google.maps.Polyline.prototype.inKm = function(n){
var a = this.getPath(n), len = a.getLength(), dist = 0;
for (var i=0; i < len-1; i++) {
dist += a.getAt(i).kmTo(a.getAt(i+1));
}
return dist;
}
}
function infoBox(map, marker, data) {
var infoWindow = new google.maps.InfoWindow();
google.maps.event.addListener(marker, "click", function(e) {
salta(data.tm);
});
(function(marker, data) {
google.maps.event.addListener(marker, "click", function(e) {
salta(data.tm);
});
})(marker, data);
}
//Create onclick marker on the polyline
function infoPoly(map, flightPath, data){
google.maps.event.addListener(flightPath, 'click', function(event) {
mk = new google.maps.Marker({
map: map,
position: event.latLng,
});
markers.push(mk);
map.setZoom(17);
map.setCenter(mk.getPosition());
});
}
function drawPath() {
var coords = [];
for (var i = 0; i < markers.length; i++) {
coords.push(markers[i].getPosition());
}
flightPath.setPath(coords);
}
// Fit these bounds to the map
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < arr.length; i++) {
bounds.extend(arr[i]);
}
map.fitBounds(bounds);
//dist polylines
distpoly = flightPath.inKm();
distpolyround = Math.round(distpoly);
};
})();
If I click in the blue arrow, I create a marker on that point of the polyline. I that marker it takes the values of the previous one.

You can use the geometry library .poly namespace isLocationOnEdge method to determine which segment of the polyline the clicked point (new marker) is on.
//Create onclick marker on the polyline
function infoPoly(map, flightPath, data) {
google.maps.event.addListener(flightPath, 'click', function(event) {
mk = new google.maps.Marker({
map: map,
position: event.latLng,
});
markers.push(mk);
map.setZoom(17);
map.setCenter(mk.getPosition());
// find line segment. Iterate through the polyline checking each line segment.
// isLocationOnEdge takes a google.maps.Polyline as the second argument, so make one,
// then use it for the test. The default value of 10e-9 for the tolerance didn't work,
// a tolerance of 10e-6 seems to work.
var betweenStr = "result no found";
var betweenStr = "result no found";
for (var i=0; i<flightPath.getPath().getLength()-1; i++) {
var tempPoly = new google.maps.Polyline({
path: [flightPath.getPath().getAt(i), flightPath.getPath().getAt(i+1)]
})
if (google.maps.geometry.poly.isLocationOnEdge(mk.getPosition(), tempPoly, 10e-6)) {
betweenStr = "between "+i+ " and "+(i+1);
}
}
(function(mk, betweenStr) {
google.maps.event.addListener(mk, "click", function(e) {
infowindow.setContent(betweenStr+"<br>loc:" + this.getPosition().toUrlValue(6));
infowindow.open(map, mk);
// salta(data.tm);
});
})(mk, betweenStr);
google.maps.event.trigger(mk,'click');
});
proof of concept fiddle
code snippet:
var infowindow = new google.maps.InfoWindow();
(function() {
window.onload = function() {
var options = {
zoom: 3,
center: new google.maps.LatLng(37.09, -95.71),
mapTypeId: google.maps.MapTypeId.HYBRID,
};
var map = new google.maps.Map(document.getElementById('map'), options);
//Marker type
var markers = [];
var arr = [];
var pinColor = "FE7569";
var pinImage = "http://labs.google.com/ridefinder/images/mm_20_red.png";
// JSON loop
for (var i = 0, length = json.length; i < length; i++) {
var data = json[i],
latLng = new google.maps.LatLng(data.lat, data.lng);
arr.push(latLng);
// Create markers
var marker = new google.maps.Marker({
position: latLng,
map: map,
icon: pinImage,
});
infoBox(map, marker, data);
//Polylines
var flightPath = new google.maps.Polyline({
path: json,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2,
map: map
});
infoPoly(map, flightPath, data);
}
function infoBox(map, marker, data) {
var infoWindow = new google.maps.InfoWindow();
google.maps.event.addListener(marker, "click", function(e) {
infowindow.setContent("tm:" + data.tm + "<br>loc:" + this.getPosition().toUrlValue(6));
infowindow.open(map, marker);
// salta(data.tm);
});
(function(marker, data) {
google.maps.event.addListener(marker, "click", function(e) {
infowindow.setContent("tm:" + data.tm + "<br>loc:" + this.getPosition().toUrlValue(6));
infowindow.open(map, marker);
// salta(data.tm);
});
})(marker, data);
}
//Create onclick marker on the polyline
function infoPoly(map, flightPath, data) {
google.maps.event.addListener(flightPath, 'click', function(event) {
mk = new google.maps.Marker({
map: map,
position: event.latLng,
});
markers.push(mk);
map.setZoom(17);
map.setCenter(mk.getPosition());
// find line segment. Iterate through the polyline checking each line segment.
// isLocationOnEdge takes a google.maps.Polyline as the second argument, so make one,
// then use it for the test. The default value of 10e-9 for the tolerance didn't work,
// a tolerance of 10e-6 seems to work.
var betweenStr = "result no found";
for (var i = 0; i < flightPath.getPath().getLength() - 1; i++) {
var tempPoly = new google.maps.Polyline({
path: [flightPath.getPath().getAt(i), flightPath.getPath().getAt(i + 1)]
})
if (google.maps.geometry.poly.isLocationOnEdge(mk.getPosition(), tempPoly, 10e-6)) {
betweenStr = "between " + i + " and " + (i + 1);
}
}
(function(mk, betweenStr) {
google.maps.event.addListener(mk, "click", function(e) {
infowindow.setContent(betweenStr + "<br>loc:" + this.getPosition().toUrlValue(6));
infowindow.open(map, mk);
// salta(data.tm);
});
})(mk, betweenStr);
google.maps.event.trigger(mk, 'click');
});
}
function drawPath() {
var coords = [];
for (var i = 0; i < markers.length; i++) {
coords.push(markers[i].getPosition());
}
flightPath.setPath(coords);
}
// Fit these bounds to the map
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < arr.length; i++) {
bounds.extend(arr[i]);
}
map.fitBounds(bounds);
//dist polylines
distpoly = flightPath.inKm();
distpolyround = Math.round(distpoly);
};
})();
var json = [{
lat: 38.931808,
lng: -74.906606,
tm: 0
}, {
lat: 38.932442,
lng: -74.905147,
tm: 1
}, {
lat: 38.93311,
lng: -74.903473,
tm: 2
}, {
lat: 38.933777,
lng: -74.901671,
tm: 3
}, {
lat: 38.930739,
lng: -74.912528,
tm: 1000
}];
html,
body,
#map {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>
<div id="map"></div>

INITIALIZING
When you are creating those markers in the for loop, add them to a map [Data structure] that you define (empty) before the loop. In the map markers will be stored. Their keys - concatenated lat/lng.
var initial_markers = {}; //before for loop
initial_markers[data.lat+"-"+data.lng] = marker; //after each marker initialization
Count them, so you know how many there are initial_marker_count, because you cannot get length of size of a map[data structure]
DETECTION
When you have clicked on a polyline, I don't think you can get exactly the part of polyline that is clicked, so you need to get it yourself. The steps are:
Get the coordinate of click event
Loop through the markers
Take their coordinates
Check if the clicked point on the map is on the line between those two points
If is, take the first of those two points
DETECTION PSEUDOCODE
var prev_marker;
for (var i=initial_markers; i<initial_marker_count-2; i++) {
if( isPointOnLine(initial_markers[i], initial_markers[i+1], clicked_point) {
prev_marker = initial_markers[i];
break;
}
}
The only reason I am saying that this is pseudocode, is because I don't know hor to find if point is on the line between two points in Google maps. And you should write that isPointOnLine() functions. Apart from that - the idea is given. Hope You appreciate it.

Marker new postion created but old is also showing in ajax google map

Hi i'm trying to get markers latlon from ajax, i m getting ajax data every second and also able to create marker within radius , now i'm facing problem with updating marker positions as in current new marker created and old one also showing. Pls help to update markers which i am getting from ajax and remove extra.
var map = null;
var geocoder = null;
var markers = {};
var infoWindow = null;
var minZoomLevel = 16;
jQuery('#search').click(function() {
var address = jQuery('#address').val() || 'India';
if (map === null)
initializeMap();
searchAddress(address);
});
function initializeMap() {
var mapOptions = {
zoom: minZoomLevel,
draggable: true,
disableDefaultUI: true,
scrollwheel: true,
disableDoubleClickZoom: true,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function (position) {
initialLocation = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
map.setCenter(initialLocation);
// Limit the zoom level
google.maps.event.addListener(map, 'zoom_changed', function () {
if (map.getZoom() < minZoomLevel) map.setZoom(minZoomLevel);
});
});
}
google.maps.event.addListener(map, "idle", function(event) {
searchStoresBounds();
});
geocoder = new google.maps.Geocoder();
infoWindow = new google.maps.InfoWindow();
}
function searchAddress(address) {
geocoder.geocode( { 'address': address}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
var latlng = results[0].geometry.location;
map.setCenter(latlng);
// Limit the zoom level
google.maps.event.addListener(map, 'zoom_changed', function () {
if (map.getZoom() < minZoomLevel) map.setZoom(minZoomLevel);
});
searchStoresBounds();
} else {
alert('Geocode was failed: ' + status);
}
});
}
setInterval(function searchStoresBounds() {
var bounds = map.getCenter().toUrlValue();
var url = './store.php';
var parameter = { bounds: bounds };
jQuery.ajax({
url: url,
data: parameter,
dataType: 'json',
success: showStores
});
}, 1000);
function showStores(data, status, xhr) {
if (data['status'] != 'OK')
return;
var id;
// add markers for new stores
for (id in data['data']) {
if (markers[id] === undefined)
createMarker(id, data['data'][id]);
}
var b = map.getBounds();
// remove markers out of the bounds
for (id in markers) {
if (! b.contains(markers[id].getPosition())) {
markers[id].setMap(null);
delete markers[id];
}else{createMarker(id, data['data'][id]);}
}
}
function createMarker(id, store) {
var latlng = new google.maps.LatLng(
parseFloat(store['lat']),
parseFloat(store['lng'])
);
var html = "<b>" + store['address'] + "</b>";
var x = store['distance'];
var y = 1000;
var z = x * y;
var m = 85;
var t = z / m;
document.getElementById("demo").innerHTML = Math.ceil(t);
var headm = store['bearing'];
var car = "M17.402,0H5.643C2.526,0,0,3.467,0,6.584v34.804c0,3.116,2.526,5.644,5.643,5.644h11.759c3.116,0,5.644-
2.527,5.644-5.644 V6.584C23.044,3.467,20.518,0,17.402,0z M22.057,14.188v11.665l-2.729,0.351v-4.806L22.057,14.188z
M20.625,10.773 c-1.016,3.9-2.219,8.51-2.219,8.51H4.638l-2.222-8.51C2.417,10.773,11.3,7.755,20.625,10.773z
M3.748,21.713v4.492l-2.73-0.349 V14.502L3.748,21.713z M1.018,37.938V27.579l2.73,0.343v8.196L1.018,37.938z
M2.575,40.882l2.218-3.336h13.771l2.219,3.336H2.575z M19.328,35.805v-7.872l2.729-0.355v10.048L19.328,35.805z";
var icon = {
path: car,
scale: .7,
strokeColor: 'White',
strokeWeight: .4,
fillOpacity: 1,
fillColor: '#333333',
offset: '5%',
rotation: parseInt(headm),
// rotation: parseInt(heading[i]),
anchor: new google.maps.Point(10, 25) // orig 10,50 back of car, 10,0 front of car, 10,25 center of car
};
var marker = new google.maps.Marker({
map: map,
position: latlng,
icon: icon,
});
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
markers[id] = marker;
}

You are facing the issue due to this part
var marker = new google.maps.Marker({
map: map,
position: latlng,
icon: icon,
});
Everytime you get data from ajax it creates a new marker.
Add the following declaration at the top of your js page
var marker;
and change the marker creation to the following
if(marker)
{
marker.setMap(null);
}
marker = new google.maps.Marker({
map: map,
position: latlng,
icon: icon,
});
Before you create a new marker the previous one is removed from the map. The if(marker) part is needed to check if a marker instance has been created because the first time that you run there will be no marker and you will get an error while trying to remove the marker.
Edit 1 :
As you have multiple markers you will need to store an array of markers and remove them before adding new markers on map
At the top of the page you will need to declare
var markerArray = new Array();
Just before you add the markers you will need to clear the previous markers
for(var i = 0; i<markerArray.length; i++)
{
markerArray[i].setMap(null);
}
markerArray = new Array()
After that will be your current code
var marker = new google.maps.Marker({
map: map,
position: latlng,
icon: icon,
});
markerArray.push(marker);
You will need to add the marker to the markerArray so that it can be cleared the next time your code executes.

Google Maps V3: Updating Markers Periodically

I've followed the PHP/MYSQL tutorial on Google Maps found here.
I'd like the markers to be updated from the database every 5 seconds or so.
It's my understanding I need to use Ajax to periodicity update the markers, but I'm struggling to understand where to add the function and where to use setTimeout() etc
All the other examples I've found don't really explain what's going on, some helpful guidance would be terrific!
This is my code (Same as Google example with some var changes):
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(37.80815648152641, 140.95355987548828),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("nwmxml.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var host = markers[i].getAttribute("host");
var type = markers[i].getAttribute("active");
var lastupdate = markers[i].getAttribute("lastupdate");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + "Host: </b>" + host + "<br>" + "<b>Last Updated: </b>" + lastupdate + "<br>";
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
shadow: icon.shadow
});
bindInfoWindow(marker, map, infoWindow, html);
}
});
}
function bindInfoWindow(marker, map, infoWindow, html) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}
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() {}
I hope somebody can help me!

Please note I have not tested this as I do not have a db with xml handy
First of all you need to split your load() function into a function that initializes the map & loads the markers on domready and a function that you will use later to process the xml & update the map with. This needs to be done so you do not reinitialize the map on every load.
Secondly you need to decide what to do with markers that are already drawn on the map. For that purpose you need to add them to an array as you add them to the map. On second update you have a choice to either redraw the markers (rebuild the array) or simply update the existing array. My example shows the scenario where you simply clear the old markers from the screen (which is simpler).
//global array to store our markers
var markersArray = [];
var map;
function load() {
map = new google.maps.Map(document.getElementById("map"), {
center : new google.maps.LatLng(37.80815648152641, 140.95355987548828),
zoom : 13,
mapTypeId : 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// your first call to get & process inital data
downloadUrl("nwmxml.php", processXML);
}
function processXML(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
//clear markers before you start drawing new ones
resetMarkers(markersArray)
for(var i = 0; i < markers.length; i++) {
var host = markers[i].getAttribute("host");
var type = markers[i].getAttribute("active");
var lastupdate = markers[i].getAttribute("lastupdate");
var point = new google.maps.LatLng(parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + "Host: </b>" + host + "<br>" + "<b>Last Updated: </b>" + lastupdate + "<br>";
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map : map,
position : point,
icon : icon.icon,
shadow : icon.shadow
});
//store marker object in a new array
markersArray.push(marker);
bindInfoWindow(marker, map, infoWindow, html);
}
// set timeout after you finished processing & displaying the first lot of markers. Rember that requests on the server can take some time to complete. SO you want to make another one
// only when the first one is completed.
setTimeout(function() {
downloadUrl("nwmxml.php", processXML);
}, 5000);
}
//clear existing markers from the map
function resetMarkers(arr){
for (var i=0;i<arr.length; i++){
arr[i].setMap(null);
}
//reset the main marker array for the next call
arr=[];
}
function bindInfoWindow(marker, map, infoWindow, html) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}
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);
}

setInterval(function() {
downloadUrl("conection/cargar_tecnicos.php", function(data) {
var xml = data.responseXML;
markers = xml.documentElement.getElementsByTagName("marker");
removeAllMarkers();
for (var i = 0; i < markers.length; i++) {
var name = markers[i].getAttribute("name");
var fecha = markers[i].getAttribute("fecha");
var id_android = markers[i].getAttribute("id_android");
var celular = markers[i].getAttribute("celular");
var id = markers[i].getAttribute("id");
var logo = markers[i].getAttribute("logo");
var type = markers[i].getAttribute("type");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<div class='infowindow'>"
+"<br/><div style='text-align:center;'><img src="+logo+"><br/>"
+"<b>" + name + "</b></div><br/>"
+"<br/><label><b>Celular:</b></label>" + celular+""
+"<br/><label><b>Id Android:</b></label>" + id_android+""
+"<br/><label><b>Fecha y Hora:</b></label>" + fecha+""
+"<br/><br/><div style='text-align:center;'><a><input style=';' id='pop' type='image' value='"+id+"' class='ASD' img src='img/vermas.png' title='Detalles'/></a></div></div>";
var icon = customIcons[type] || {};
marker[i] = new google.maps.Marker({
position: point,
icon: icon.icon,
shadow: icon.shadow,
title:name
});
openInfoWindow(marker[i], map, infoWindow, html);
marker[i].setMap(map);
}
});
},10000);
}
function removeAllMarkers(){// removes all markers from map
for( var i = 0; i < marker.length; i++ ){
marker[i].setMap(null);
}
}

Open infoWindow of specific marker from outside Google Maps (V3)

I can't seem to get my head around this problem:
I've got a map with (a lot of) markers (companies) that come from a generated XML file. Below the map, I want to show a (non-JavaScript-generated) list of all the companies that are displayed on the map. When I would click a company in the list, the map would pan to that specific marker and open an infoWindow. The thing is that I want the map and the list to be two separate things...
What would be the right way to tackle this problem? Thanks! Important is that all markerinfo is dynamic...
function initialize_member_map(lang) {
var map = new google.maps.Map(document.getElementById("large-map-canvas"), {
center: new google.maps.LatLng(50.85034, 4.35171),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
downloadUrl("/ajax/member-xml-output.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < markers.length; i++) {
var company = markers[i].getAttribute("company");
var address = markers[i].getAttribute("address");
var type = markers[i].getAttribute("type");
var uid = markers[i].getAttribute("uid"); // Primary key of company table in MySQL
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + company + "</b> <br/>" + address;
bounds.extend(point);
var marker = new google.maps.Marker({
map: map,
position: point,
uid: uid // Some experiments, wanted to use this to target specific markers...
});
bindInfoWindow(marker, map, infoWindow, html);
}
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
});
}
function bindInfoWindow(marker, map, infoWindow, html) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}
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() {}
Following the suggestions by Michal, I've tried the following, but am encountering two problems: my console tells me markers[index].getPosition is not a function and the first item in my list shows to be undefined. Can you please help?
//JavaScript Document
var map;
var markers = new Array();
var company_list;
function initialize_member_map(lang) {
map = new google.maps.Map(document.getElementById("large-map-canvas"), {
center: new google.maps.LatLng(50.85034, 4.35171),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("/ajax/member-xml-output.php?country=BE", function(data) {
var xml = data.responseXML;
markers = xml.documentElement.getElementsByTagName("marker");
var bounds = new google.maps.LatLngBounds();
for (var i = 0; i < markers.length; i++) {
var company = markers[i].getAttribute("company");
var address = markers[i].getAttribute("address");
var type = markers[i].getAttribute("type");
var uid = markers[i].getAttribute("uid");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + company + "</b> <br/>" + address;
bounds.extend(point);
var marker = new google.maps.Marker({
map: map,
position: point,
uid: uid
});
bindInfoWindow(marker, map, infoWindow, html);
company_list += "<div onclick=scrollToMarker(" + i + ")>"+company+"</div>";
}
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
//display company data in html
document.getElementById("company_list").innerHTML = company_list;
});
}
function scrollToMarker(index) {
map.panTo(markers[index].getPosition());
}
function bindInfoWindow(marker, map, infoWindow, html) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}
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(){
}

You are on the right track. You just need to create a separate global array for your Marker objects and push all created markers to this array. When you write out all your company data to html include a call with the index of the marker executed on click. Below is an example code. I used JSON as my data structure to hold company info instead of XML.
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=yes" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps Scroll to Marker</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width: 900px;height: 600px;"></div>
<div id="companies"></div>
<script type="text/javascript">
var map;
//JSON of company data - equivalent of your XML
companies = {
"data": [
{
"name": "Company 1",
"lat": 42.166,
"lng": -87.848
},
{
"name": "Company 2",
"lat": 41.8358,
"lng": -87.7128
},
{
"name": "Company 3",
"lat": 41.463,
"lng": -88.870
},
{"name":"Company 4",
"lat":41.809, "lng":-87.790}
]
}
//we will use this to store google map Marker objects
var markers=new Array();
function initialize() {
var chicago = new google.maps.LatLng(41.875696,-87.624207);
var myOptions = {
zoom: 9,
center: chicago,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
listCompanies();
}
function listCompanies() {
html = ""
//loop through all companies
for (i=0;i<companies.data.length;i++) {
//get the maker postion
lat = companies.data[i].lat
lng = companies.data[i].lng
//add google maps marker
marker = new google.maps.Marker({
map:map,
position: new google.maps.LatLng(lat,lng),
title: companies.data[i].name
})
markers.push(marker);
html += "<div onclick=scrollToMarker(" + i + ")>"+companies.data[i].name+"</div>";
}
//display company data in html
document.getElementById("companies").innerHTML =html;
}
function scrollToMarker(index) {
map.panTo(markers[index].getPosition());
}
</script>
</body>
</html>
Ok I added another solution for you - uising your code. This one uses your bindInfWindow function to bind the DOM (HTML) click event to open info window and scroll to marker. Please note that because you are loading companies dynamically the divs (or some other tags) that hold their names and ids must exist in the DOM BEFORE you start binding events to it - so the first function you need to execute is the one that renders companies HTML (not the map init). Please note I have not tested this one as I do not have your data..
//you must write out company divs first
<body onload="showCompanies()">
<script>
//JavaScript Document
var map;
//this is your text data
var markers = new Array();
//you need to create your company list first as we will be binding dom events to it so it must exist before marekrs are initialized
function showCompanies() {
downloadUrl("/ajax/member-xml-output.php?country=BE", function(data) {
var xml = data.responseXML;
markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var company = markers[i].getAttribute("company");
markerId = "id_"+i;
company_list += "<div id="+markerId+">"+company+"</div>";
}
//display company data in html
document.getElementById("company_list").innerHTML = company_list;
//now you are ready to initialize map
initialize_member_map("lang")
});
}
function initialize_member_map(lang) {
map = new google.maps.Map(document.getElementById("large-map-canvas"), {
center: new google.maps.LatLng(50.85034, 4.35171),
zoom: 13,
mapTypeId: 'roadmap'
});
var xml = data.responseXML;
var bounds = new google.maps.LatLngBounds();
//your company data was read in and is ready to be mapped
for (var i = 0; i < markers.length; i++) {
var infoWindow = new google.maps.InfoWindow;
var company = markers[i].getAttribute("company");
var address = markers[i].getAttribute("address");
var type = markers[i].getAttribute("type");
var uid = markers[i].getAttribute("uid");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + company + "</b> <br/>" + address;
bounds.extend(point);
var marker = new google.maps.Marker({
map: map,
position: point,
uid: uid
});
//add the new marker object to the gMarkers array
markerId = "id_"+i;
bindInfoWindow(marker, map, infoWindow, html,markerId);
}
map.setCenter(bounds.getCenter());
map.fitBounds(bounds);
}
function scrollToMarker(index) {
map.panTo(markers[index].getPosition());
}
function bindInfoWindow(marker, map, infoWindow, html, markerId) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
//bind onlcick events to the div or other object in html
markerObj = document.getElementById(markerId);
//you can create DOM event listeners for the map
google.maps.event.addDomListener(markerObj, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
map.panTo(marker.getPosition());
});
}
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>

since i cannot remove this answer, I decided to add some notes!
if your xml format is similar to this: http://www.w3schools.com/dom/books.xml
you may access author nodeValue with following lines.
markers = xml.documentElement.getElementsByTagName("book");
for (var i = 0; i < markers.length; i++) {
authors = markers[i].getElementsByTagName('author')[0].innerHTML;
}
hope it helps someone :)

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