I'm trying to make a geocoding function and reverse geocoding function in the same html page. I need to use just one marker for these functions. The code below works but every time I call a function, I create a new marker. What I need is just one marker to control in the whole map
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Geocoding service</title>
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
#panel {
position: absolute;
top: 5px;
left: 50%;
margin-left: -180px;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>
<script>
var geocoder;
var map;
function initialize() {
geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(34.042145, -4.997128);
var mapOptions = {
zoom: 5,
center: latlng
}
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
marker = new google.maps.Marker({
map: map,
position: latlng,
draggable : true
});
google.maps.event.addListener(marker,"dragend",function(){
lat = marker.getPosition().lat();
document.getElementById("latitude").value = lat ;
lg= marker.getPosition().lng();
document.getElementById("longitude").value = lg ;
});
}
function codeAddress() {
var address = document.getElementById('address').value;
var lg;
var lat;
geocoder.geocode( { 'address': address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
map.setCenter(results[0].geometry.location);
map.setZoom(16);
var lat = results[0].geometry.location.lat();
document.getElementById('latitude').value = lat;
var lg = results[0].geometry.location.lng();
document.getElementById('longitude').value = lg;
marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location,
draggable : true
});
google.maps.event.addListener(marker,"dragend",function(){
lat = marker.getPosition().lat();
document.getElementById("latitude").value = lat ;
lg= marker.getPosition().lng();
document.getElementById("longitude").value = lg ;
});
}
else {
alert('Geocode was not successful for the following reason: ' + status);
}
});
}
function codeLatLng() {
var input = document.getElementById('latlng').value;
var latlngStr = input.split(',', 2);
var lat = parseFloat(latlngStr[0]);
var lng = parseFloat(latlngStr[1]);
var latlng = new google.maps.LatLng(lat, lng);
geocoder.geocode({'latLng': latlng}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[1]) {
map.setCenter(latlng);
map.setZoom(11);
marker = new google.maps.Marker({
position: latlng,
map: map
});
document.getElementById("adresse").value = results[1].formatted_address;
} else {
alert('No results found');
}
} else {
alert('Geocoder failed due to: ' + status);
}
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="panel">
<input id="address" type="textbox">
<input id="latitude" type="textbox" >
<input id="longitude" type="textbox" >
<input type="button" value="Geocode" onclick="codeAddress()">
<input id="latlng" type "textbox" >
<input type="button" value="Reverse Geocode" onclick="codeLatLng()">
<input id="adresse" type "textbox" >
</div>
<div id="map-canvas"></div>
</body>
</html>
