Develop Reference

google maps Cannot read property 'maps' of undefined

i trying to display markers according to user location and i keep getting this error that as commenas it is i didnt find any solution that match my problem,
thae error i'm getiing is : Uncaught TypeError: Cannot read property 'maps' of undefined & its referring to this :at Array.filter (native) .
thanks:
<script src="https://maps.googleapis.com/maps/api/js?key="My_Api_Key"&libraries=geometry"></script>
<script>
"use strict";
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(
function(position) {
var markers = #Html.Raw(Json.Encode(Model.UpcomingLectureGigs));
var currentLatitude = position.coords.latitude;
var currentLongitude = position.coords.longitude;
var userLatLng = currentLatitude + currentLongitude;
var markersFiltered = markers.filter(function(markers, index, array, google) {
var myLatlng = new window.google.maps.LatLng(markers.Latitude, markers.Longitude);
return google.maps.geometry.spherical.computeDistanceBetween(userLatLng, myLatlng) < 10000;
});
window.onload = function(a) {
var mapOptions = {
center: new window.google.maps.LatLng(markers[0].Latitude, markers[0].Longitude),
zoom: 8,
mapTypeId: window.google.maps.MapTypeId.ROADMAP
};
var infoWindow = new window.google.maps.InfoWindow();
var map = new window.google.maps.Map(document.getElementById("dvMap"), mapOptions);
for (var i = 0; i < markersFiltered.length; i++) {
var data = markers[i];
var myLatlng = new window.google.maps.LatLng(data.Latitude, data.Longitude);
var marker = new window.google.maps.Marker({
position: myLatlng,
draggable: true,
animation: google.maps.Animation.DROP,
get map() { return map; }
});
(function(marker, data) {
window.google.maps.event.addListener(marker,
"click",
function(e) {
infoWindow.setContent(data.Venue + " " + data.Genre.Name);
infoWindow.open(map, marker);
});
})(marker, data);
}
};
});
};
</script>
https://jsfiddle.net/1gm0u4wd/9/

Your html will be as below. Your maps api javascript will be linked inside html section not javascript section.
<div id="map" style="width: 500px; height: 500px"/>
<script src="https://maps.googleapis.com/maps/api/js?key=yourMapsAPIKey&libraries=geometry"></script>
Note : "yourMapsAPIKey" should be your API key.
You can get your maps api key from here.
Update your script as below
"use strict";
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(
function(position) {
var currentLatitude = position.coords.latitude;
var currentLongitude = position.coords.longitude;
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: new google.maps.LatLng(currentLatitude, currentLongitude),
});
//your dynamic markers
var markers = #Html.Raw(Json.Encode(Model.UpcomingLectureGigs));
//default marker at current location
//var markers = new google.maps.Marker({
//position: new google.maps.LatLng(currentLatitude, currentLongitude),
//map: map,
//title: 'Hello World!'
//});
var userLatLng = new window.google.maps.LatLng(currentLatitude, currentLongitude);
//your filter function
var markersFiltered = markers.filter(function(markers, index, array, google) {
var myLatlng = new window.google.maps.LatLng(markers.Latitude, markers.Longitude);
return google.maps.geometry.spherical.computeDistanceBetween(userLatLng, myLatlng) < 10000;
});
window.onload = function(a) {
var mapOptions = {
center: new window.google.maps.LatLng(markers[0].Latitude, markers[0].Longitude),
zoom: 8,
mapTypeId: window.google.maps.MapTypeId.ROADMAP
};
var infoWindow = new window.google.maps.InfoWindow();
var map = new window.google.maps.Map(document.getElementById("dvMap"), mapOptions);
for (var i = 0; i < markersFiltered.length; i++) {
var data = markers[i];
var myLatlng = new window.google.maps.LatLng(data.Latitude, data.Longitude);
var marker = new window.google.maps.Marker({
position: myLatlng,
draggable: true,
animation: google.maps.Animation.DROP,
get map() {
return map;
}
});
(function(marker, data) {
window.google.maps.event.addListener(marker,
"click",
function(e) {
infoWindow.setContent(data.Venue + " " + data.Genre.Name);
infoWindow.open(map, marker);
});
})(marker, data);
}
};
});
};
Fiddle here

Google Maps Javascript not getting Coordinates of user

This javascript wont get the coordinates of the user
(this is a html, js and css application only)
(the area with Bold and Italic text, is the one supposed to get the coordinates from the client)
I have tried different soloutions, and they wont work, + it doesnt show the ones if the user is within 25km
center: new google.maps.LatLng(val(coords.latitude),val(coords.longitude)),
<script type="text/javascript">
var side_bar_html = "";
var gmarkers = [];
var map = null;
var markerclusterer = null;
function createMarker(latlng, name, html) {
var contentString = html;
var marker = new google.maps.Marker({
position: latlng,
zIndex: Math.round(latlng.lat()*-100000)<<5
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(contentString);
infowindow.open(map,marker);
});
gmarkers.push(marker);
side_bar_html += '<a href="javascript:myclick(' + (gmarkers.length-1) + ')">' + name + '<\/a><br>';
}
function myclick(i) {
google.maps.event.trigger(gmarkers[i], "click");
}
function initialize() {
var myOptions = {
zoom: 8,
center: new google.maps.LatLng(val(coords.latitude),val(coords.longitude)),
mapTypeControl: true,
mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU},
navigationControl: true,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
google.maps.event.addListener(map, 'click', function() {
infowindow.close();
});
google.maps.event.addListener(map, 'click', find_closest_marker);
downloadUrl("markers.xml", function(doc) {
var xmlDoc = xmlParse(doc);
var markers = xmlDoc.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var lat = parseFloat(markers[i].getAttribute("lat"));
var lng = parseFloat(markers[i].getAttribute("lng"));
var point = new google.maps.LatLng(lat,lng);
var id = markers[i].getAttribute("id");
var sted = markers[i].getAttribute("sted");
var html="<b>"+sted+"</b><br>"+id;
var marker = createMarker(point,sted+" "+id,html);
}
markerCluster = new MarkerClusterer(map, gmarkers);
document.getElementById("side_bar").innerHTML = side_bar_html;
});
}
var infowindow = new google.maps.InfoWindow(
{
size: new google.maps.Size(150,50)
});
function find_closest_marker( event ) {
var closestMarker = -1;
var closestDistance = Number.MAX_VALUE;
for( i=0;i<gmarkers.length; i++ ) {
var distance = google.maps.geometry.spherical.computeDistanceBetween(gmarkers[i].getPosition(),event.latLng);
if ( distance < closestDistance ) {
closestMarker = i;
closestDistance = distance;
}
}
map.setCenter(gmarkers[closestMarker].getPosition());
if (map.getZoom() < 16) map.setZoom(16);
google.maps.event.trigger(gmarkers[closestMarker], 'click');
}
</script>

You can user a simple JS function for that.
<script>
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showLatLng);
} else {
alert("Geolocation is not supported by this browser.");
}
}
function showLatLng(location) {
alert("Latitude: " + location.coords.latitude +
"Longitude: " + location.coords.longitude);
}
</script>
Hope it helps

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

Markers Created via JSON Are Not Clustering with Google Maps MarkerClusterer

I'm having trouble getting the Google Maps MarkerClusterer to work. I'm fairly sure I follow procedure correctly (i.e. creating the map, adding markers to an array, not setting the markers to a map, and then attaching the map and the markers to a MarkerClusterer), which leads me to believe maybe it has to do something with Google Maps v3 versus v2. I'm just creating markers from a json file and than filtering the markers based off of user input.
Quick note: When I add a map to the marker all the markers show up, but they just aren't clustered.
$('document').ready(function() {
$('#map').height($(window).height() - $('#map').position().top - 20);
var mapElem = document.getElementById('map');
var center = {
lat: 47.6,
lng: -122.3
}
var map = new google.maps.Map(mapElem, {
center: center,
zoom: 12
});
var infoWindow = new google.maps.InfoWindow();
var cameras;
var markers = [];
$.getJSON('http://data.seattle.gov/resource/65fc-btcc.json')
.done(function(data) {
cameras = data;
cameras.forEach(function(cameras) {
var marker = new google.maps.Marker({
position: {
lat: parseFloat(cameras.location.latitude),
lng: parseFloat(cameras.location.longitude)
}
});
google.maps.event.addListener(marker, 'click', function() {
map.panTo(this.getPosition());
var html = '<p>' + cameras.cameralabel + '</p>';
html += '<img src="' + cameras.imageurl.url + '"/>';
infoWindow.setContent(html);
infoWindow.open(map, this);
});
google.maps.event.addListener(map, 'click', function() {
infoWindow.close();
});
markers.push(marker);
$('#search').bind('search keyup', function() {
var cameraName = cameras.cameralabel.toLowerCase();
var searchString = this.value.toLowerCase();
if (cameraName.indexOf(searchString) < 0) {
marker.setMap(null);
} else {
marker.setMap(map);
}
});
});
})
.fail(function(err) {
console.log(err);
alert('Sorry, unfortunately something went wrong!');
});
var markerCluster = new MarkerClusterer(map, markers);
$(window).resize(function() {
$('#map').height($(window).height() - $('#map').position().top - 20);
});
});

You need to initialize the MarkerClusterer inside the callback function (where the markers array is created).
$('document').ready(function() {
$('#map').height($(window).height() - $('#map').position().top - 20);
var mapElem = document.getElementById('map');
var center = {
lat: 47.6,
lng: -122.3
}
var map = new google.maps.Map(mapElem, {
center: center,
zoom: 12
});
var infoWindow = new google.maps.InfoWindow();
var cameras;
var markers = [];
$.getJSON('http://data.seattle.gov/resource/65fc-btcc.json')
.done(function(data) {
cameras = data;
cameras.forEach(function(cameras) {
var marker = new google.maps.Marker({
position: {
lat: parseFloat(cameras.location.latitude),
lng: parseFloat(cameras.location.longitude)
}
});
google.maps.event.addListener(marker, 'click', function() {
map.panTo(this.getPosition());
var html = '<p>' + cameras.cameralabel + '</p>';
html += '<img src="' + cameras.imageurl.url + '"/>';
infoWindow.setContent(html);
infoWindow.open(map, this);
});
google.maps.event.addListener(map, 'click', function() {
infoWindow.close();
});
markers.push(marker);
$('#search').bind('search keyup', function() {
var cameraName = cameras.cameralabel.toLowerCase();
var searchString = this.value.toLowerCase();
if (cameraName.indexOf(searchString) < 0) {
marker.setMap(null);
} else {
marker.setMap(map);
}
});
});
// here, inside the .done function
var markerCluster = new MarkerClusterer(map, markers);
})
.fail(function(err) {
console.log(err);
alert('Sorry, unfortunately something went wrong!');
});
$(window).resize(function() {
$('#map').height($(window).height() - $('#map').position().top - 20);
});
});
working fiddle

'myFunction is not a function', JS & Google Maps v 3?

Hello I cannot figure out why I get this error.
I've got a list with inputs which values contain lat/long/name/address.
Printing the markers on the map works fine, using the infowin workED fine, till I realized that it only openend the same info in all windows. Soo, obviously I needed to attach this (the marker i just clicked) to the eventListner.
But, when doing this I get an error saying view.createMarkerHTML is not a function.
Question: What do I do to attach the right info to be open, on the right marker?
view = {
map: {
init: function init (){
view.map.initMap();
},
initMap: function initMap() {
if(navigator.geolocation) {
function hasPosition(position) {
var point = new google.maps.LatLng(position.coords.latitude, position.coords.longitude),
myOptions = {
zoom: 12,
center: point,
mapTypeId: google.maps.MapTypeId.ROADMAP
},
mapDiv = document.getElementById("map"),
map = new google.maps.Map(mapDiv, myOptions);
view.map.handleMarkers(map);
}
navigator.geolocation.getCurrentPosition(hasPosition);
}
},
handleMarkers: function handleMarkers(map) {
var list = $('#pois input'),
l = list.length,
i = 0, lat = '', long = '', marker = {}, theName = '', address = '', info = {};
for (i = 0; i < l; i += 1) {
info = $(list[i]).val().split('|');
lat = parseFloat(info[0], 10);
long = parseFloat(info[1], 10);
theName = info[2];
address = info[3];
marker = new google.maps.Marker({
position: new google.maps.LatLng(lat, long),
map: map,
icon: icon
});
google.maps.event.addListener(marker, 'click', function() {
currentMarker = this;view.map.createMarkerHTML(map, theName, address);
});
}
} ,
createMarkerHTML: function createMarkerHTML(map, theName, address) {
var contentString =
'<div id="gMapInfoWin">' +
'<h1>' + theName + '</h1>' +
'<ul>' +
'<li>' + address + '</li>' +
'</ul>' +
'</div>'
;
currentMarker.infowindow = new google.maps.InfoWindow({
content: contentString
});
currentMarker.infowindow.open(map, currentMarker);
}
}
};

Shouldn't you use a closure to keep the values of your variables set in the loop ?
(function(theName, address) {
google.maps.event.addListener(marker, 'click', function() {
currentMarker = this;view.map.createMarkerHTML(map, theName, address);
});
}(theName, address));
You could even add your marker in parameter instead of using currentMarker

I'll wager that it's a scoping issue. Not having access to your libs I can't be sure that this will work, but try replacing:
google.maps.event.addListener(marker, 'click', function() {
currentMarker = this;view.map.createMarkerHTML(map, theName, address);
});
with this:
google.maps.event.addListener(marker,
'click',
createClickListener( this,
map,
theName,
address ) );
and then add this function somewhere else in the program:
function createClickListener( cm, map, theName, address )
{
return function() {
currentMarker = cm;
view.map.createMarkerHTML(map, theName, address);
}
}

for (i = 0; i < l; i += 1) {
info = $(list[i]).val().split('|');
lat = parseFloat(info[0], 10);
long = parseFloat(info[1], 10);
marker = new google.maps.Marker({
position: new google.maps.LatLng(lat, long),
map: map,
icon: icon
});
marker.theName = info[2];
marker.address = info[3];
google.maps.event.addListener(marker, 'click', function() {
currentMarker = this;
m_name = this.theName;
m_address = this.address
view.map.createMarkerHTML(map, m_name, m_address);
});
}
marker.theName = info[2];
marker.address = info[3];
currentMarker = this;
m_name = this.theName;
m_address = this.address
... is the soulution!