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map.html
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<!DOCTYPE html>
<html>
<head>
<title>Remove Markers</title>
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#floating-panel {
position: absolute;
top: 10px;
left: 45%;
z-index: 5;
background-color: #fff;
padding: 0px;
border: 1px solid #999;
text-align: center;
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 0px;
}
</style>
</head>
<body>
<div id="floating-panel">
<input onclick="deleteMarkers();" type=button value="Delete Markers">
</div>
<div id="map" style="width:100%;height:500px;"></div>
<script>
var map;
var markers = [];
var flag=0;
function myMap() {
var mapCanvas = document.getElementById("map");
var myCenter=new google.maps.LatLng(51.508742,-0.120850);
var mapOptions = {center: myCenter, zoom: 5};
var map = new google.maps.Map(mapCanvas, mapOptions);
google.maps.event.addListener(map, 'click', function(event) {
if(flag==0){
flag=1;
placeMarker(map, event.latLng);
}
});
}
function placeMarker(map, location) {
var marker = new google.maps.Marker({
position: location,
map: map
});
var infowindow = new google.maps.InfoWindow({
content: 'Latitude: ' + location.lat() + '<br>Longitude: ' + location.lng()
});
infowindow.open(map,marker);
markers.push(marker);
}
function setMapOnAll(map) {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(map);
}
}
function deleteMarkers() {
setMapOnAll(null);
flag=0;
markers = [];
}
function print(){
document.write(sizeof(markers));
}
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBu-916DdpKAjTmJNIgngS6HL_kDIKU0aU&callback=myMap"></script>
<input type="button" onclick="print();" value="Remove">
</body>
</html>