How to set zoom level in google map
JavascriptGoogle MapsGoogle Maps-Api-3Javascript Problem Overview
Here is the code I have written to add a marker to the google map by providing latitude and longitude. The problem is that I get a very highly zoomed google map. I have tried setting the zoom level to 1 but this has no effect to the very highly zoomed map.
<script src="http://maps.google.com/maps/api/js?v=3&sensor=false" type="text/javascript"></script>
<script type="text/javascript">
var icon = new google.maps.MarkerImage("http://maps.google.com/mapfiles/ms/micons/blue.png",new google.maps.Size(32, 32), new google.maps.Point(0, 0),new google.maps.Point(16, 32));
var center = null;
var map = null;
var currentPopup;
var bounds = new google.maps.LatLngBounds();
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
bounds.extend(pt);
var marker = new google.maps.Marker({
position: pt,
icon: icon,
map: map
});
var popup = new google.maps.InfoWindow({
content: info,
maxWidth: 300
});
google.maps.event.addListener(marker, "click", function() {
if (currentPopup != null) {
currentPopup.close();
currentPopup = null;
}
popup.open(map, marker);
currentPopup = popup;
});
google.maps.event.addListener(popup, "closeclick", function() {
map.panTo(center);
currentPopup = null;
});
}
function initMap() {
map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(0, 0),
zoom: 1,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: false,
mapTypeControlOptions: {
style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR
},
navigationControl: true,
navigationControlOptions: {
style: google.maps.NavigationControlStyle.SMALL
}
});
addMarker(27.703402,85.311668,'New Road');
center = bounds.getCenter();
map.fitBounds(bounds);
}
</script>
</head>
<body onload="initMap()" style="margin:0px; border:0px; padding:0px;">
<div id="map"></div>
</body>
</html>
How can i decrease the level of zoom for this case?
Javascript Solutions
Solution 1 - Javascript
Your code below is zooming the map to fit the specified bounds:
addMarker(27.703402,85.311668,'New Road');
center = bounds.getCenter();
map.fitBounds(bounds);
If you only have 1 marker and add it to the bounds, that results in the closest zoom possible:
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
bounds.extend(pt);
}
If you keep track of the number of markers you have "added" to the map (or extended the bounds with), you can only call fitBounds if that number is greater than one. I usually push the markers into an array (for later use) and test the length of that array.
If you will only ever have one marker, don't use fitBounds. Call setCenter, setZoom with the marker position and your desired zoom level.
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
map.setCenter(pt);
map.setZoom(your desired zoom);
}
html,
body,
#map {
height: 100%;
width: 100%;
padding: 0;
margin: 0;
}
<html>
<head>
<script src="http://maps.google.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk" type="text/javascript"></script>
<script type="text/javascript">
var icon = new google.maps.MarkerImage("http://maps.google.com/mapfiles/ms/micons/blue.png", new google.maps.Size(32, 32), new google.maps.Point(0, 0), new google.maps.Point(16, 32));
var center = null;
var map = null;
var currentPopup;
var bounds = new google.maps.LatLngBounds();
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
map.setCenter(pt);
map.setZoom(5);
var marker = new google.maps.Marker({
position: pt,
icon: icon,
map: map
});
var popup = new google.maps.InfoWindow({
content: info,
maxWidth: 300
});
google.maps.event.addListener(marker, "click", function() {
if (currentPopup != null) {
currentPopup.close();
currentPopup = null;
}
popup.open(map, marker);
currentPopup = popup;
});
google.maps.event.addListener(popup, "closeclick", function() {
map.panTo(center);
currentPopup = null;
});
}
function initMap() {
map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(0, 0),
zoom: 1,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: false,
mapTypeControlOptions: {
style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR
},
navigationControl: true,
navigationControlOptions: {
style: google.maps.NavigationControlStyle.SMALL
}
});
addMarker(27.703402, 85.311668, 'New Road');
// center = bounds.getCenter();
// map.fitBounds(bounds);
}
</script>
</head>
<body onload="initMap()" style="margin:0px; border:0px; padding:0px;">
<div id="map"></div>
</body>
</html>
Solution 2 - Javascript
map.setZoom(zoom:number)
https://developers.google.com/maps/documentation/javascript/reference#Map
Solution 3 - Javascript
What you're looking for are the scales for each zoom level. The numbers are in metres. Use these:
20 : 1128.497220
19 : 2256.994440
18 : 4513.988880
17 : 9027.977761
16 : 18055.955520
15 : 36111.911040
14 : 72223.822090
13 : 144447.644200
12 : 288895.288400
11 : 577790.576700
10 : 1155581.153000
9 : 2311162.307000
8 : 4622324.614000
7 : 9244649.227000
6 : 18489298.450000
5 : 36978596.910000
4 : 73957193.820000
3 : 147914387.600000
2 : 295828775.300000
1 : 591657550.500000
Solution 4 - Javascript
For zooming in your map two levels, add this small line of code,
map.setZoom(map.getZoom() + 2);
Solution 5 - Javascript
Here is a function I use:
var map = new google.maps.Map(document.getElementById('map'), {
center: new google.maps.LatLng(52.2, 5),
mapTypeId: google.maps.MapTypeId.ROADMAP,
zoom: 7
});
function zoomTo(level) {
google.maps.event.addListener(map, 'zoom_changed', function () {
zoomChangeBoundsListener = google.maps.event.addListener(map, 'bounds_changed', function (event) {
if (this.getZoom() > level && this.initialZoom == true) {
this.setZoom(level);
this.initialZoom = false;
}
google.maps.event.removeListener(zoomChangeBoundsListener);
});
});
}
Solution 6 - Javascript
These methods worked for me, it maybe useful for anyone: MapOptions interface
set min zoom: mMap.setMinZoomPreference(N);
set max zoom: mMap.setMaxZoomPreference(N);
where N can equal to:
20 : 1128.497220
19 : 2256.994440
18 : 4513.988880
17 : 9027.977761
16 : 18055.955520
15 : 36111.911040
14 : 72223.822090
13 : 144447.644200
12 : 288895.288400
11 : 577790.576700
10 : 1155581.153000
9 : 2311162.307000
8 : 4622324.614000
7 : 9244649.227000
6 : 18489298.450000
5 : 36978596.910000
4 : 73957193.820000
3 : 147914387.600000
2 : 295828775.300000
1 : 591657550.500000