Update Google map by latitude and longitude form
Question
So I am building a HTML page, in which i need a Google Map and a simple form which consists of two fields latitude and longitude.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map-canvas { height: 100% }
</style>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyA_0qaGwK5ZWdKYXHRlJ-05CI_geHWo6v4&sensor=false">
</script>
<script type="text/javascript">
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(-34.397, 150.644),
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"/>
</body>
</html>
So this is the code to embed a map, from what i have to figured that I need to create a form which change the values of this line :
center: new google.maps.LatLng(-34.397, 150.644)
and updates it whenever I press the update button or submit button. I know how to create a form but don't know how exactly to use in the above code.
Any help would be appreciated.
4 answers
solution1
12 ACCPTED 2013-04-30 09:46:32
<!DOCTYPE html>
<html>
<head>
<title>Simple Map</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body, #map-canvas {
margin: 0;
padding: 0;
height: 100%;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script>
var map;
function initialize() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
}
google.maps.event.addDomListener(window, 'load', initialize);
function pan() {
var panPoint = new google.maps.LatLng(document.getElementById("lat").value, document.getElementById("lng").value);
map.panTo(panPoint)
}
</script>
</head>
<body>
<label>lat</label><input type="text" id="lat" />
<br/>
<label>lng</label><input type="text" id="lng" />
<input type="button" value="updateCenter" onclick="pan()" />
<div id="map-canvas"></div>
</body>
</html>
solution2
2 2013-04-30 09:32:38
You can use api documentation of google maps
https://developers.google.com/maps/documentation/javascript/reference#Map
In your condition you should use set map method:
<input type="button" onclick="map.setCenter(new google.maps.LatLng(-34.397, 150.644))" value="test"/>
solution3
0 2013-04-30 09:33:30
This is an elegant solution, moves the camera to the point.
var myLatlng = new google.maps.LatLng(lat, lng);
map.panTo(myLatlng);
This jumps directly to the point.
var myLatlng = new google.maps.LatLng(lat, lng);
map.setCenter(myLatlng);
solution4
0 2017-09-08 11:30:35
For anyone who will come later, suppose you want to update your map latitudes and longitudes from an array(like in case you have a list of cities), you can try this:
Globaly declare your variables and array
var latlon;
var map;
var coords = {
'agra': '27.1767, 78.0081',
'noida': '28.5355, 77.3910',
'kanpur':'26.4499, 80.3319',
};
Add a function that will work on your selects on change, so that when you change a city, the map automatically changes.
function firemapChange(value)
{
var c = coords[value].split(',');
var latlon = new google.maps.LatLng(c[0], c[1]);
// map = new google.maps.Map(document.getElementById('mapdiv'), {
//center: {lat: position.coords.latitude, lng: position.coords.longitude},
// center: latlon,
// zoom: 13,
// mapTypeId: 'roadmap'
map.panTo(latlon);
}
Why i have commented so many lines? It is because i was accidentally creating a new map object. Since my map also had a search box, the search box disappeared and all its functionality was lost. So, it is better to avoid creating a new map, and create a global variable
finally in your HTML, you do something like this:
<label style="font-size:11px;">City
</label>
</td>
<td>
<select size="auto" style="font-size:11px;" onChange="firemapChange(this.value)">
<option value="select city" id="b1">Select City
</option>
<option value="noida" id="b1">Noida
</option>
<option value="agra" id="b1">Agra
</option>
<option value="kanpur" id="b1">Kanpur
</option>
</td>
</tr>
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