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I'm working on a project using Google Maps v3 that will allow users to drag and drop randomly placed markers (quantity, coordinates, and labels generated with php).
I would like the latitude and longitude of moved markers to update html input fields on the page. Unfortunately, I do not know enough about js to give each marker a unique identity in an efficient way by using arrays and/or 'variable variables'.
Here is my code thus far:
<!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: 0px; padding: 0px }
#map_canvas { height: 100% }
</style>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<script type="text/javascript">
function initialize()
{
var latlng = new google.maps.LatLng(39.3939,-119.861);
var myOptions =
{
zoom: 17,
center: latlng,
mapTypeId: google.maps.MapTypeId.SATELLITE
};
var map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
// Set Border Coords
var BorderCoords =
[
new google.maps.LatLng(39.3952726888,-119.85922848),
new google.maps.LatLng(39.3925273112,-119.85922848),
new google.maps.LatLng(39.3925273112,-119.86277152),
new google.maps.LatLng(39.3952726888,-119.86277152)
];
// Define Border
Border = new google.maps.Polygon
({
map: map,
paths: BorderCoords,
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2
});
// Set marker coords
var MarkerCoords =
[
[39.3930761,-119.8612324],
[39.3947606,-119.8617452],
[39.3948516,-119.8619689],
[39.3929412,-119.859542],
[39.3947902,-119.8601571],
[39.3940501,-119.8593369]
];
// Set marker properties
var MarkerProp =
[
["Red","A"],
["Red","B"],
["Red","C"],
["Blue","A"],
["Blue","B"],
["Blue","C"]
];
// Define marker coords
for (var i = 0; i < MarkerCoords.length; i++)
{
var markers = new google.maps.Marker
({
map: map,
position: new google.maps.LatLng(MarkerCoords[i][0],MarkerCoords[i][1]),
clickable: true,
draggable: true,
icon: 'img/icons/'+MarkerProp[i][0]+'/letter_'+MarkerProp[i][1]+'.png'
});
google.maps.event.addListener(markers, "dragend", function()
{
//These variables will not work
//var latstr = eval('lat_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
//var lngstr = eval('lng_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
//var lat = document.getElementById(latstr);
//var lng = document.getElementById(lngstr);
//these lat/lng variables work for only one set of input fields
var lat = document.getElementById('lat_Blue_C');
var lng = document.getElementById('lng_Blue_C');
var coords = this.getPosition()
lat.value = coords.lat();
lng.value = coords.lng();
});
}
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:700px; height:400px"></div>
<br/>
<input id="lat_Red_A" type="text">
<input id="lng_Red_A" type="text">
<br/>
<input id="lat_Red_B" type="text">
<input id="lng_Red_B" type="text">
<br/>
<input id="lat_Red_C" type="text">
<input id="lng_Red_C" type="text">
<br/>
<input id="lat_Blue_A" type="text">
<input id="lng_Blue_A" type="text">
<br/>
<input id="lat_Blue_B" type="text">
<input id="lng_Blue_B" type="text">
<br/>
<input id="lat_Blue_C" type="text">
<input id="lng_Blue_C" type="text">
<br/>
</body>
</html>
560
You can allow users to move a marker on the map by setting the marker's draggable property to true .
WP Google Maps supports a theoretically unlimited number of markers, the only practical limitations are your servers resources and the performance of your target audiences devices. The plugin will easily handle 3,200 locations.
Here is the answer. Define a custom id based on your marker properties and based on that access yout input field ids:
<!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: 0px; padding: 0px }
#map_canvas { height: 100% }
</style>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<script type="text/javascript">
function initialize()
{
var latlng = new google.maps.LatLng(39.3939,-119.861);
var myOptions =
{
zoom: 17,
center: latlng,
mapTypeId: google.maps.MapTypeId.SATELLITE
};
var map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
// Set Border Coords
var BorderCoords =
[
new google.maps.LatLng(39.3952726888,-119.85922848),
new google.maps.LatLng(39.3925273112,-119.85922848),
new google.maps.LatLng(39.3925273112,-119.86277152),
new google.maps.LatLng(39.3952726888,-119.86277152)
];
// Define Border
Border = new google.maps.Polygon
({
map: map,
paths: BorderCoords,
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2
});
// Set marker coords
var MarkerCoords =
[
[39.3930761,-119.8612324],
[39.3947606,-119.8617452],
[39.3948516,-119.8619689],
[39.3929412,-119.859542],
[39.3947902,-119.8601571],
[39.3940501,-119.8593369]
];
// Set marker properties
var MarkerProp =
[
["Red","A",],
["Red","B"],
["Red","C"],
["Blue","A"],
["Blue","B"],
["Blue","C"]
];
// Define marker coords
for (var i = 0; i < MarkerCoords.length; i++)
{
var markers = new google.maps.Marker
({
map: map,
position: new google.maps.LatLng(MarkerCoords[i][0],MarkerCoords[i][1]),
clickable: true,
draggable: true,
//define a custom id based on marker properties
my_id: MarkerProp[i][0] +"_"+MarkerProp[i][1],
icon: 'img/icons/'+MarkerProp[i][0]+'/letter_'+MarkerProp[i][1]+'.png'
});
google.maps.event.addListener(markers, "dragend", function()
{
//These variables will not work
//var latstr = eval('lat_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
//var lngstr = eval('lng_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
//var lat = document.getElementById(latstr);
//var lng = document.getElementById(lngstr);
//get the id of the marker
var marker_id = this.my_id;
//match the fields to update
var lat = document.getElementById('lat_' + marker_id);
var lng = document.getElementById('lng_' + marker_id);
var coords = this.getPosition()
lat.value = coords.lat();
lng.value = coords.lng();
});
}
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:700px; height:400px"></div>
<br/>
<input id="lat_Red_A" type="text">
<input id="lng_Red_A" type="text">
<br/>
<input id="lat_Red_B" type="text">
<input id="lng_Red_B" type="text">
<br/>
<input id="lat_Red_C" type="text">
<input id="lng_Red_C" type="text">
<br/>
<input id="lat_Blue_A" type="text">
<input id="lng_Blue_A" type="text">
<br/>
<input id="lat_Blue_B" type="text">
<input id="lng_Blue_B" type="text">
<br/>
<input id="lat_Blue_C" type="text">
<input id="lng_Blue_C" type="text">
<br/>
</body>
</html>
Well one of the beautiful things about JavaScript is that you can assign objects fields on the fly. One thing you could do would give each marker a name or an id. To do that you simply say:
marker.id = whatever;
Then you can get the value of that like you would any property by calling marker.id;
That is probably the most efficient way of giving them unique id's. In your eventhandler for the dragend you could then just do and if-then-else to check which marker it was and update the related input fields.
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