View this example full screen.
var map;
var chicago = new google.maps.LatLng(41.850033, -87.6500523);
/**
* The HomeControl adds a control to the map that
* returns the user to the control's defined home.
*/
// Define a property to hold the Home state
HomeControl.prototype.home_ = null;
// Define setters and getters for this property
HomeControl.prototype.getHome = function() {
return this.home_;
}
HomeControl.prototype.setHome = function(home) {
this.home_ = home;
}
/** @constructor */
function HomeControl(controlDiv, map, home) {
// We set up a variable for this since we're adding
// event listeners later.
var control = this;
// Set the home property upon construction
control.home_ = home;
// Set CSS styles for the DIV containing the control
// Setting padding to 5 px will offset the control
// from the edge of the map
controlDiv.style.padding = '5px';
// Set CSS for the control border
var goHomeUI = document.createElement('div');
goHomeUI.style.backgroundColor = 'white';
goHomeUI.style.borderStyle = 'solid';
goHomeUI.style.borderWidth = '2px';
goHomeUI.style.cursor = 'pointer';
goHomeUI.style.textAlign = 'center';
goHomeUI.title = 'Click to set the map to Home';
controlDiv.appendChild(goHomeUI);
// Set CSS for the control interior
var goHomeText = document.createElement('div');
goHomeText.style.fontFamily = 'Arial,sans-serif';
goHomeText.style.fontSize = '12px';
goHomeText.style.paddingLeft = '4px';
goHomeText.style.paddingRight = '4px';
goHomeText.innerHTML = '<b>Home</b>';
goHomeUI.appendChild(goHomeText);
// Set CSS for the setHome control border
var setHomeUI = document.createElement('div');
setHomeUI.style.backgroundColor = 'white';
setHomeUI.style.borderStyle = 'solid';
setHomeUI.style.borderWidth = '2px';
setHomeUI.style.cursor = 'pointer';
setHomeUI.style.textAlign = 'center';
setHomeUI.title = 'Click to set Home to the current center';
controlDiv.appendChild(setHomeUI);
// Set CSS for the control interior
var setHomeText = document.createElement('div');
setHomeText.style.fontFamily = 'Arial,sans-serif';
setHomeText.style.fontSize = '12px';
setHomeText.style.paddingLeft = '4px';
setHomeText.style.paddingRight = '4px';
setHomeText.innerHTML = '<b>Set Home</b>';
setHomeUI.appendChild(setHomeText);
// Setup the click event listener for Home:
// simply set the map to the control's current home property.
google.maps.event.addDomListener(goHomeUI, 'click', function() {
var currentHome = control.getHome();
map.setCenter(currentHome);
});
// Setup the click event listener for Set Home:
// Set the control's home to the current Map center.
google.maps.event.addDomListener(setHomeUI, 'click', function() {
var newHome = map.getCenter();
control.setHome(newHome);
});
}
function initialize() {
var mapDiv = document.getElementById('map-canvas');
var mapOptions = {
zoom: 12,
center: chicago,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(mapDiv, mapOptions);
// Create the DIV to hold the control and
// call the HomeControl() constructor passing
// in this DIV.
var homeControlDiv = document.createElement('div');
var homeControl = new HomeControl(homeControlDiv, map, chicago);
homeControlDiv.index = 1;
map.controls[google.maps.ControlPosition.TOP_RIGHT].push(homeControlDiv);
}
google.maps.event.addDomListener(window, 'load', initialize);
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Adding state to controls</title>
<link href="/maps/documentation/javascript/examples/default.css" rel="stylesheet">
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script>
var map;
var chicago = new google.maps.LatLng(41.850033, -87.6500523);
/**
* The HomeControl adds a control to the map that
* returns the user to the control's defined home.
*/
// Define a property to hold the Home state
HomeControl.prototype.home_ = null;
// Define setters and getters for this property
HomeControl.prototype.getHome = function() {
return this.home_;
}
HomeControl.prototype.setHome = function(home) {
this.home_ = home;
}
/** @constructor */
function HomeControl(controlDiv, map, home) {
// We set up a variable for this since we're adding
// event listeners later.
var control = this;
// Set the home property upon construction
control.home_ = home;
// Set CSS styles for the DIV containing the control
// Setting padding to 5 px will offset the control
// from the edge of the map
controlDiv.style.padding = '5px';
// Set CSS for the control border
var goHomeUI = document.createElement('div');
goHomeUI.style.backgroundColor = 'white';
goHomeUI.style.borderStyle = 'solid';
goHomeUI.style.borderWidth = '2px';
goHomeUI.style.cursor = 'pointer';
goHomeUI.style.textAlign = 'center';
goHomeUI.title = 'Click to set the map to Home';
controlDiv.appendChild(goHomeUI);
// Set CSS for the control interior
var goHomeText = document.createElement('div');
goHomeText.style.fontFamily = 'Arial,sans-serif';
goHomeText.style.fontSize = '12px';
goHomeText.style.paddingLeft = '4px';
goHomeText.style.paddingRight = '4px';
goHomeText.innerHTML = '<b>Home</b>';
goHomeUI.appendChild(goHomeText);
// Set CSS for the setHome control border
var setHomeUI = document.createElement('div');
setHomeUI.style.backgroundColor = 'white';
setHomeUI.style.borderStyle = 'solid';
setHomeUI.style.borderWidth = '2px';
setHomeUI.style.cursor = 'pointer';
setHomeUI.style.textAlign = 'center';
setHomeUI.title = 'Click to set Home to the current center';
controlDiv.appendChild(setHomeUI);
// Set CSS for the control interior
var setHomeText = document.createElement('div');
setHomeText.style.fontFamily = 'Arial,sans-serif';
setHomeText.style.fontSize = '12px';
setHomeText.style.paddingLeft = '4px';
setHomeText.style.paddingRight = '4px';
setHomeText.innerHTML = '<b>Set Home</b>';
setHomeUI.appendChild(setHomeText);
// Setup the click event listener for Home:
// simply set the map to the control's current home property.
google.maps.event.addDomListener(goHomeUI, 'click', function() {
var currentHome = control.getHome();
map.setCenter(currentHome);
});
// Setup the click event listener for Set Home:
// Set the control's home to the current Map center.
google.maps.event.addDomListener(setHomeUI, 'click', function() {
var newHome = map.getCenter();
control.setHome(newHome);
});
}
function initialize() {
var mapDiv = document.getElementById('map-canvas');
var mapOptions = {
zoom: 12,
center: chicago,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(mapDiv, mapOptions);
// Create the DIV to hold the control and
// call the HomeControl() constructor passing
// in this DIV.
var homeControlDiv = document.createElement('div');
var homeControl = new HomeControl(homeControlDiv, map, chicago);
homeControlDiv.index = 1;
map.controls[google.maps.ControlPosition.TOP_RIGHT].push(homeControlDiv);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>