Develop Reference

Node.js googlemaps cluster execute error

I'm now use the node.js platform. And I want to use googlemap cluster library. However I can't execute the source code.
googlemaps cluster api url : https://github.com/googlemaps/js-marker-clusterer
This library's index is below.
dosc
examples
images
src
etc..
In the directory of examples, I want to test a "simple_example.html".
My node.js source code is below.
[app.js]
var express = require("express");
var app = express();
app.set('view engine','ejs');
var path = require("path");
app.set("public", path.join(__dirname, "public"));
app.get('/', function(req, res){
res.render("simple_example", {} )
});
app.listen(3000);
console.log("Running at Port 3000");
[simple_example.ejs] (important script part)
<script src="https://maps.googleapis.com/maps/api/js"></script>
<script src="public/data.json"></script>
<script type="text/javascript" src="public/src/markerclusterer.js"></script>
<script>
function initialize() {
var center = new google.maps.LatLng(37.4419, -122.1419);
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: center,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var markers = [];
for (var i = 0; i < 100; i++) {
var dataPhoto = data.photos[i];
var latLng = new google.maps.LatLng(dataPhoto.latitude,
dataPhoto.longitude);
var marker = new google.maps.Marker({
position: latLng
});
markers.push(marker);
}
var markerCluster = new MarkerClusterer(map, markers, {imagePath: 'public/images/m'});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
This picture is result of execute by my source code. but the picture doesn't have markered in the map. I expected picture is below.
I tried path change of src, change web platform(as python) but I can't solve the problem. Who know the solution?

Once you create a marker cluster, support it by using addMarker() method or by providing a array of markers to the constructor.
When they say add marker to constructor by providing a array of markers it's similar to doing this:
var markers = []; //create a global array where you store your markers
for (var i = 0; i < 100; i++) {
var latLng = new google.maps.LatLng(data.photos[i].latitude,
data.photos[i].longitude);
var marker = new google.maps.Marker({'position': latLng});
markers.push(marker); //push individual marker onto global array
}
var markerCluster = new MarkerClusterer(map, markers); //create clusterer and push the global array of markers into it.
To add it using addMarker() you basically add it to the cluster like the following:
var markerCluster //cluster object created on global scope
//do your marker creation and add it like this:
markerCluster.addMarker(newMarker, true); //if specify true it'll redraw the map
Here's a reference to MarkerCluster: https://googlemaps.github.io/js-marker-clusterer/docs/examples.html
Also, here's a demo app how to use markercluster: https://github.com/googlemaps/js-marker-clusterer

Google Maps OverlappingMarkerSpiderfier instantiation problems

I've searhced the site for this error and, while there were several answers, none of them worked for me (or weren't applicable).
I am using google maps API v3 and am trying to implement OverlappingMarkerSpiderfier to solve my problem of overlapping markers. My problem is that I cannot create an instance of an OMS:
function getStateInfo(){
//do stuff
var lat = 42.5724;
var lon = -74.948052;
var map = new google.maps.Map(document.getElementById("map"),{draggableCursor:'pointer'});
var oms = new OverlappingMarkerSpiderfier(map,{markersWontMove: true, markersWontHide: true});
// do more stuff
var whiteicon = new GIcon();
whiteicon.image = "images/whiteCircle.png";
whiteicon.iconSize = new GSize(11, 11);
whiteicon.iconAnchor = new GPoint(6, 6);
whiteicon.infoWindowAnchor = new GPoint(6,6);
var marker = new GMarker(new GLatLng(lat,lon), {
draggable: false,
title: ($(this).find('COMPANY_NAME').text()),
icon: whiteicon,
map: map
});
oms.addMarker(marker);
}
I get the following error:
InvalidValueError: setMap: not an instance of Map; and not an instance of StreetViewPanorama
I have verified that the error occurs at the time of instantiation and not at marker creation/placement. For thoroughness, here is the code I am trying to use to place markers:
var marker = new GMarker(new GLatLng(lat,long), {
draggable: false,
title: ($(this).find('COMPANY_NAME').text()),
icon: whiteicon,
map: map});
...
oms.addMarker(marker);
I have also retrieved a different copy of OMS in the event that there was something wonky with the original (downloaded from github).
If you need to see more code, just let me know what you are looking for. I just posted the lines which are the problem. My map generates properly without OMS - it's just the oms instantiation that is the problem.

You are using a deprecated Google Maps JavaScript API v2 map with a Google Maps JavaScript API v3 spiderifier.
This is v2 code (GSize, GPoint, GLatLng):
whiteicon.iconSize = new GSize(11, 11);
whiteicon.iconAnchor = new GPoint(6, 6);
var marker = new GMarker(new GLatLng(lat,lon), {

Using a large data set of address to create a Google API heat map

I'm trying to create a heatmap using Google's API, but running into a few issues. The main issue I have run into so far is converting a large set of about ~25000 addresses into geocoordinates for use in the API. The two approaches I have used are Google's own API, which has heavy limitations, and Python's Geopy module, which also has limitations. Since I am trying to convert ~25000, Geopy's one second delay is a pretty steep issue.
The second issue I can see coming is a size limitation. Once I have a list of ~25000 geocoordinates, putting those into an array in Javascript seems ridiculous. Assuming a user would upload a text file in a format like this:
12.3456,-12.3456
23.4567,-23.4567
...
Would there be a way to process the file in blocks, or some other work around?
In case it helps, this is my current Javascript code for processing a file of addresses. I'm planning on changing the file reading format to find a better system.
var map, heatmap, geocoder;
var MVCarr;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 36.85, lng: -75.97},
zoom: 7
});
MVCarr = new google.maps.MVCArray();
heatmap = new google.maps.visualization.HeatmapLayer({
data: MVCarr,
map: map
})
}
window.onload = function() {
var fileInput = document.getElementById('fileInput');
var fileDisplayArea = document.getElementById('fileDisplayArea');
geocoder = new google.maps.Geocoder();
fileInput.addEventListener('change', function(e) {
var file = fileInput.files[0];
var reader = new FileReader();
reader.onload = function(e) {
var mySplit = (reader.result).split("\n");
for(var i = 0, len = mySplit.length; i < len; i++) {
//console.log(mySplit[i]);
geocodeAddress(geocoder, mySplit[i]);
}
}
reader.readAsText(file);
});
}
function geocodeAddress(geocoder, address) {
geocoder.geocode({'address': address}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
MVCarr.push(results[0].geometry.location);
console.log(MVCarr.length);
} else {
console.log('Failed: ' + status);
}
});
}

how do i add a custom image marker in here maps?

how can add a custom image marker in here map,
i can add markers in map by using this code:
var map, standardMarker;
map = new nokia.maps.map.Display(mapContainer, {
center: [lat, log],
zoomLevel: 12,
components: [new nokia.maps.map.component.Behavior(),
new nokia.maps.map.component.ZoomBar(),
new nokia.maps.map.component.TypeSelector()]
});
standardMarker = new nokia.maps.map.StandardMarker(map.center);
map.objects.add(standardMarker);
​
but the problem is map contains many markers ,so i need small custom markers.
can anyone help me!?

nokia.maps are old version of the HERE map JavaScript API version 2.5, you can use new version of HERE map JS API 3.0. I recommend for new developments to use the latest 3.0 version.
https://developer.here.com/documentation
and some examples http://developer.here.com/api-explorer
/**
* Step 1: initialize communication with the platform
*/
var platform = new H.service.Platform({
app_id: hereMapAppID,
app_code: hereMapAppCode,
useHTTPS: true,
useCIT: false
});
var defaultLayers = platform.createDefaultLayers();
var mapContainer = document.getElementById('hereMapDivId');
//Step 2: initialize a map - not specificing a location will give a whole world view.
var map = new H.Map(mapContainer,
defaultLayers.normal.map,{
center: {lat: 53.430, lng: -2.961},
zoom: 7
});
//Step 3: make the map interactive
// MapEvents enables the event system
// Behavior implements default interactions for pan/zoom (also on mobile touch environments)
var behavior = new H.mapevents.Behavior(new H.mapevents.MapEvents(map));
// Create the default UI components
var ui = H.ui.UI.createDefault(map, defaultLayers);
var yourMarker = baseUrl+'/images/ico/your_marker.png';
var icon = new H.map.Icon(yourMarker);
marker = new H.map.Marker(map.center, { icon: icon });
var group = new H.map.Group();
map.addObject(group);
group.addObject(marker);

Add Custom Marker From Your System
function addMarkerToGroup(group, coordinate, html) {
var marker = new H.map.Marker(coordinate,{ icon: pngIcon });
// add custom data to the marker
marker.setData(html);
group.addObject(marker);
}
var yourMarker = '<PATH_OF_IMG/IMG_NAME>';
var pngIcon = new H.map.Icon(yourMarker, {size: {w: 56, h: 56}});

Creating multiple instances of a google API on an HTML page

I am creating a web page that lets a user enter a start location and an end location into textbox's and the distance between the two locations is output (this is using a google API). I have successfully been able to create a single instance of this that works as I want it to. However my problem is that I need multiple rows of this but as soon I duplicate the code I cannot seem to get it to work. This is my first real attempt at using javascript so my understanding of it is not that great. I realise that I need to change variables etc. but am unsure exactly as what to change. Sorry if I have not been clear enough but any help would be great, thanks.
Here is my code:
<body onload="initialize()">
<script type="text/javascript">
var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer();
var belfast = new google.maps.LatLng(55, -5)
var myOptions = {
zoom:5,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: belfast,
}
map = new google.maps.Map(document.getElementById("map_canvas1"), myOptions);
directionsDisplay.setMap(map);
}
function calcRoute() {
var start = document.getElementById("pc1").value;
var end = document.getElementById("pc2").value;
var distanceInput = document.getElementById("distance");
var request = {
origin:start,
destination:end,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
distanceInput.value = response.routes[0].legs[0].distance.value / 1000;
}
});
}
<td><input type="text" id="pc1" /></td>

If you're creating multiple instances of Google Maps, you need to make sure you're not mixing up global variables. These variables you're declaring on a global level:
var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
So if you try to create a second map and assign the map to the map variable, which should destroy the previous map. Likewise your DirectionsService. So you need to create a variable for each of those for each instance.