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Сообщение от Koder-S
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все равно добавляются маркеры при каждом клике
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значит вы что-то не договариваите, ваш код ничем не отличается от моего.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Marker Labels</title>
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script>
// In the following example, markers appear when the user clicks on the map.
// Each marker is labeled with a single alphabetical character.
var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
var labelIndex = 0;
var marker;
function initialize() {
var bangalore = { lat: 12.97, lng: 77.59 };
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 12,
center: bangalore
});
// This event listener calls addMarker() when the map is clicked.
google.maps.event.addListener(map, 'click', function(event) {
addMarker(event.latLng, map);
});
// Add a marker at the center of the map.
addMarker(bangalore, map);
}
// Adds a marker to the map.
function addMarker(location, map) {
// Add the marker at the clicked location, and add the next-available label
// from the array of alphabetical characters.
marker && marker.setMap(null);
marker = new google.maps.Marker({
position: location,
label: labels[labelIndex++ % labels.length],
map: map
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map"></div>
</body>
</html>