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var map;
var markers = [];
function initialize() {
var haightAshbury = new google.maps.LatLng(37.7699298, -122.4469157);
var mapOptions = {
zoom: 12,
center: haightAshbury,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
google.maps.event.addListener(map, 'click', function(event) {
addMarker(event.latLng);
});
}
// Add a marker to the map and push to the array.
function addMarker(location) {
var marker = new google.maps.Marker({
position: location,
map: map
});
markers.push(marker);
}
// Sets the map on all markers in the array.
function setAllMap(map) {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(map);
}
}
// Removes the overlays from the map, but keeps them in the array.
function clearOverlays() {
setAllMap(null);
}
// Shows any overlays currently in the array.
function showOverlays() {
setAllMap(map);
}
// Deletes all markers in the array by removing references to them.
function deleteOverlays() {
clearOverlays();
markers = [];
}
google.maps.event.addDomListener(window, 'load', initialize);
<!DOCTYPE html>
<html>
<head>
<title>Remove an overlay</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 markers = [];
function initialize() {
var haightAshbury = new google.maps.LatLng(37.7699298, -122.4469157);
var mapOptions = {
zoom: 12,
center: haightAshbury,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
google.maps.event.addListener(map, 'click', function(event) {
addMarker(event.latLng);
});
}
// Add a marker to the map and push to the array.
function addMarker(location) {
var marker = new google.maps.Marker({
position: location,
map: map
});
markers.push(marker);
}
// Sets the map on all markers in the array.
function setAllMap(map) {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(map);
}
}
// Removes the overlays from the map, but keeps them in the array.
function clearOverlays() {
setAllMap(null);
}
// Shows any overlays currently in the array.
function showOverlays() {
setAllMap(map);
}
// Deletes all markers in the array by removing references to them.
function deleteOverlays() {
clearOverlays();
markers = [];
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="panel">
<input onclick="clearOverlays();" type=button value="Hide Overlays">
<input onclick="showOverlays();" type=button value="Show All Overlays">
<input onclick="deleteOverlays();" type=button value="Delete Overlays">
</div>
<div id="map-canvas"></div>
<p>Click on the map to add markers.</p>
</body>
</html>