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How to display a specific city on Google Maps API? - javascript

I searched a lot on the web and I found similar question, but unfortunately no one has solved the problem, so I opened my own question hoping someone with a solution.
Essentially I want display a specific city, in this case Milan located in Italy. I successfully initialized the map:
var myMap;
var myLatlng = new google.maps.LatLng(45.4627123, 9.1075212,12);
function initialize() {
var mapOptions = {
zoom: 13,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
scrollwheel: false
}
myMap = new google.maps.Map(document.getElementById('worldMap'), mapOptions);
var marker = new google.maps.Marker({
position: myLatlng,
map: myMap,
title: Lang.geolocation,
icon: 'http://www.google.com/intl/en_us/mapfiles/ms/micons/red-dot.png'
});
}
google.maps.event.addDomListener(window, 'load', initialize);
this display the map:
but I want display only the city of Milan like:
how can I do this?
ps: the last image comes from the plugin jvectormap

One option:
go to http://www.gadm.org/download, download the adm3 file for Italy (you can use other sources of data, Natural Earth had similar information)
Unzip that file, edit the contained KML to remove all the <Placemark>s that aren't Milan.
Combine that polygon (as the inner ring(s)) with a polygon that covers the whole earth (more details in my answer to the question: KML invert country border)
Display on the map using geoxml3 (example)
proof of concept fiddle
Code:
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(45.468889,9.202216),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var geoXml = new geoXML3.parser({
map: map,
suppressInfoWindows: true,
zoom: false,
});
geoXml.parse("http://www.geocodezip.com/geoxml3_test/kml/Milano_inverted.kml");
}
google.maps.event.addDomListener(window, "load", initialize);
Working example
code snippet:
var map;
function initialize() {
map = new google.maps.Map(document.getElementById('map'), {
center: new google.maps.LatLng(45.468889, 9.202216),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var geoXml = new geoXML3.parser({
map: map,
suppressInfoWindows: true,
zoom: false,
});
// geoXml.parse("http://www.geocodezip.com/geoxml3_test/kml/Milano_inverted.kml");
geoXml.parseKmlString(kmlStr);
}
google.maps.event.addDomListener(window, "load", initialize);
var kmlStr = '<?xml version="1.0" encoding="utf-8" ?><kml xmlns="http://www.opengis.net/kml/2.2"><Document id="root_doc"><Style id="1"><LineStyle><width>1.5</width><color>ff000000</color></LineStyle><PolyStyle><color>aa0000df</color><fill>1</fill></PolyStyle></Style><Folder><name>gadm36_ITA_3</name><Placemark><Style><LineStyle><width>1.5</width><color>ff000000</color></LineStyle><PolyStyle><color>ff000000</color><fill>1</fill></PolyStyle></Style><ExtendedData><SchemaData schemaUrl="#gadm36_ITA_3"><SimpleData name="NAME_0">Italy</SimpleData><SimpleData name="NAME_1">Lombardia</SimpleData><SimpleData name="NAME_2">Milano</SimpleData><SimpleData name="NAME_3">Milano</SimpleData> </SchemaData></ExtendedData><MultiGeometry><Polygon><outerBoundaryIs><LinearRing><coordinates>180,85 90,85 0,85 -90,85 -180,85 -180,0 -180,-85 -90,-85 0,-85 90,-85 180,-85 180,0 180,85</coordinates></LinearRing></outerBoundaryIs><innerBoundaryIs><LinearRing><coordinates>9.10490036010737,45.4479179382324 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html,
body,
#map {
height: 100%;
margin: 0;
padding: 0;
}
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/geocodezip/geoxml3#master/polys/geoxml3.js"></script>
To restrict it to be always displayed on the map see this page from Mike Williams' v2 tutorial

Related

What I want to achieve:
I want to display a search box in google map. When a user search a location, result is displayed in map box. On the map, when a user RightClick, I want to store the marker in database.
Resource I tried to implement
storing marker to database:
https://www.sanwebe.com/2013/10/google-map-v3-editing-saving-marker-in-database
displaying search box in map
https://developers.google.com/maps/documentation/javascript/examples/places-searchbox
I tried to implement these two as one: here is my minimal code
var mapCenter = new google.maps.LatLng(27.7172, 85.3240);
var map;
google.maps.event.addDomListener(window, 'load', map_initialize);
function map_initialize() {
var map = new google.maps.Map(document.getElementById('map'), {
center: mapCenter,
zoom: 13,
mapTypeId: 'roadmap'
});
google.maps.event.addListener(map, 'rightclick', function(event) {
create_marker(event.latLng);
});
}
function create_marker(MapPos) {
var marker = new google.maps.Marker({
position: MapPos,
map: map
});
}
#map {
height: 200px;
}
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>
With this code when I right click on the map, nothing happens i.e. neither the marker shows nor any error.

The map variable needs to be accessible from your create_marker function, therefore you declared it outside of your other functions. But also inside the map_initialize function. Remove the var declaration from there and it will work.
I have edited your original question to include a MCVE which means that I removed 90% of your code to keep only what you were after: adding a marker on right click.
Please take that as a suggestion for how to write your next questions.
var mapCenter = new google.maps.LatLng(27.7172, 85.3240);
google.maps.event.addDomListener(window, 'load', map_initialize);
function map_initialize() {
map = new google.maps.Map(document.getElementById('map'), {
center: mapCenter,
zoom: 13,
mapTypeId: 'roadmap'
});
google.maps.event.addListener(map, 'rightclick', function(event) {
create_marker(event.latLng);
});
}
function create_marker(MapPos) {
var marker = new google.maps.Marker({
position: MapPos,
map: map
});
}
#map {
height: 200px;
}
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>

I display a google map on a web page, based on latitude and longitude. All works fine. But if I change my browser language to any language (e.g. French, German) from the default English, then the map goes blank (google map box displayed, but no map).
I tried adding language=en to the script link; makes no difference. Anyone who can shed some light?
Code is shown below:-
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=places&sensor=false"></script>
<script>
function initialize() {
var myLatlng = new google.maps.LatLng("50.00123", "0.012311");
var mapOptions = {
zoom: 13,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById('mapdiv'), mapOptions);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'Event Location'
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>

My map is missing the pin drop, I tried figuring out the api page but i cant seem to get the pin on my google map. here is my code so far. If anyone has any ideas on how to get that pin on there I would appreciate it.
<!-- GOOGLE MAPS -->
<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script>
function initialize() {
var map_canvas = document.getElementById('map_canvas');
var map_options = {
center: new google.maps.LatLng(33.6676314, -117.6598071),
zoom: 14,
scrollwheel: false ,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(map_canvas, map_options)
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
<div id="map_canvas"></div>

That code is creating a map centered on lat 33.6676314, lng -117.6598071 and I'm pretty sure the map is showing fine. You haven't yet created any markers, so go on and make one. The code to achieve that, in its most basic form is
function initialize() {
var map_canvas = document.getElementById('map_canvas');
var map_options = {
center: new google.maps.LatLng(33.6676314, -117.6598071),
zoom: 14,
scrollwheel: false ,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(map_canvas, map_options);
var newmarker= new google.maps.Marker({
position: new google.maps.LatLng(33.6676314, -117.6598071),
map: map
});
}
please note that the map property of a marker should point to whatever variable you named your map to. For example:
var AwesomeMap = new google.maps.Map(map_canvas, map_options);
var newmarker= new google.maps.Marker({
position: new google.maps.LatLng(33.6676314, -117.6598071),
map: AwesomeMap
});
Position can be any valid LatLng object or LatLng literal. The following, for example, is valid too
var newmarker= new google.maps.Marker({
position: {lat:33.6676314, lng:-117.6598071},
map: AwesomeMap
});

Check this out
http://www.x2tutorials.com/tutorials/google-maps-v3/using-map-markers.php
If this is not what you are trying to achieve, please elaborate on the problem you are facing

<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body, #map-canvas {
margin: 0;
padding: 0;
height: 100%;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script>
var map;
function initialize() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
I am trying to understand the javascript portion of this code under the script tag. What exactly is it doing, since the code is not commented out under the Google API.

The documentation has it all laid out pretty well: Google Maps Javascript API Documentation
var map;
Defines a variable named map.
function initialize() {..}
Defines function named intialize
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
Sets up options for the map (zoom: how far the map is zoomed in on it's point. center: center of the map defined by latitude and longitude values passed. mapTypeID: the type of map you want the maps API to appear as (ROADMAP, SATELLITE, TERRAIN, HYBRID)

var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
This is setting various options for the map; the zoom level of the map, the initial coordinates of the map and the type of map to use (you can use roadmap, satellite or hybrid)
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
This creates the map object and adds it to your page.
google.maps.event.addDomListener(window, 'load', initialize);
This attaches an event listener to the window so that when it loads up the initialise function will run thereby creating the map.

Hey guys hoping for a little help here.
First I created a working map here: http://leongaban.com/_stack/googlemaps/firstmap.html
Pointer is shown on the spot, however I needed to remove the Map | Satellite | Terrain buttons.
Digging a bit deeper I found an example here disablingDefaults. However I could not get the map to work using my google.map.js file and my API key. So I just used the script from Google's example page.
Now my 2nd map I have the Map view options removed, but cannot get an overlay to show up :(
http://leongaban.com/_stack/googlemaps/
Please Help!
Goals:
Use my Google maps API key
Remove the Map view option buttons
Put overlay pointer on the location.
Code for my first map with my google API 2 key:
<head>
<title>Test Google Maps</title>
<script src="http://maps.google.com/maps?file=api&v=2&key=AIzaSyAXsNu2EwRNqKJn9OmC19WPkEJFM0r6ALk&sensor=true"
type="text/javascript"></script>
<script type="text/javascript">
function initialize() {
// var myOptions = {
// zoom: 16,
// center: new google.maps.LatLng(40.750159, -73.976473),
// disableDefaultUI: true,
// mapTypeId: google.maps.MapTypeId.ROADMAP
// }
// var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
// var point = new GLatLng(40.750159, -73.976473);
// map.addOverlay(new GMarker(point));
var map = new GMap2(document.getElementById("map_canvas"));
map.setCenter(new GLatLng(40.750159, -73.976473), 13);
map.setUIToDefault();
var myGeographicCoordinates = new GLatLng(40.750159, -73.976473)
map.addOverlay(new GMarker(myGeographicCoordinates));
// map.addOverlay(new GMarker(40.750159, -73.976473));
}
</script>
</head>
<body onload="initialize()" onunload="GUnload()">
<div id="map_canvas" style="width: 450px; height: 370px"></div>
</body>
UPDATED
WORKING CODE! THANKS STACKERS!!!
<head>
<title>Test Google Maps</title>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
function initialize() {
var myOptions = {
zoom: 16,
center: new google.maps.LatLng(40.750159, -73.976473),
disableDefaultUI: true,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var myGeographicCoordinates = new google.maps.LatLng(40.750159, -73.976473);
var marker = new google.maps.Marker({
map: map,
position: myGeographicCoordinates,
title: "My First Test Marker",
visible: true
});
}
</script>
</head>
<body onload="initialize()" onunload="GUnload()">
<div id="map_canvas" style="width: 450px; height: 370px"></div>
</body>

There's a problem with how you define your latLng objects.
new GLatLng(40.750159, -73.976473);
That was used with Google Maps Api v2. Now you're using the latest api(v3), and in new api, this is how you should do it:
new google.maps.LatLng(40.750159, -73.976473);
EDIT: After your edit, i see there are some problems with the marker. In API v3 this is how you make a new marker:
var marker = new google.maps.Marker({
map: map,
position: latLng
});
Following code sets a map, disables default UI, sets a marker and put it on the map;
function initialize() {
var myOptions = {
zoom: 16,
center: new google.maps.LatLng(40.750159, -73.976473),
disableDefaultUI: true,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var myGeographicCoordinates = new GLatLng(40.750159, -73.976473);
var marker = new google.maps.Marker({
map: map,
position: myGeographicCoordinates
});
}

Now that you have moved to the v3 API, you want to change your marker creation code from:
map.addOverlay(new GMarker(myGeographicCoordinates));
to:
var marker = new google.maps.Marker({
map: map,
position: myGeographicCoordinates,
title: "My First Test Marker",
visible: true
});
If you want, you may also define a custom marker icon in the MarkerOptions that are passed to the marker constructor function and set the value equal to the path and name of an image file:
var marker = new google.maps.Marker({
map: map,
icon: "images/my-nice-marker.png",
position: myGeographicCoordinates,
title: "My First Test Marker",
visible: true
});