[OpenLayers-Users] Get LonLat of Draggable Marker

[Kelvin Nicholson]

Brad:

That worked flawlessly - thanks!

Kelvin

On Sun, 2009-07-26 at 17:37 +1000, Brad Spencer wrote:
> Kelvin,
> 
> I set up an oncomplete attribute on the drag control as so...
> 
> controls = { drag: new OpenLayers.Control.DragFeature(userMarkers,
> {'onComplete': onCompleteMove} )	}
> map.addControl(controls['drag']);
> controls['drag'].activate();
> 
> Then you can get access to the feature attributes such as geometry.x and
> geometry.y
> 
> 
> function onCompleteMove(feature)
> {
> 	if(feature)
> 	{	
> 		// replace coordinate values in feature attributes
> 		var pointX = feature.geometry.x;
> 		var pointY = feature.geometry.y;
> 
> etc....
> 
> Cheers, Brad...
> 
> -----Original Message-----
> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] On
> Behalf Of Kelvin Nicholson
> Sent: Sunday, July 26, 2009 12:43 PM
> To: users at openlayers.org
> Subject: [OpenLayers-Users] Get LonLat of Draggable Marker
> 
> Good morning/evening all:
> 
> Here's a quickie, I hope.  I have a small map that displays a draggable
> marker - this is working fine. I want to allow the user to move around a
> marker, and when they submit a form, it takes the lon/lat from the map
> and includes it with the other data.
> 
> I'm currently using the drawFeatures DragFeature function from the
> examples (see end of email).  However, I'm curious what is the best
> method to re-obtain where the marker has been dragged.  Should I look at
> using a doneDragging function out of the DragFeature control, and if so,
> how would I call it? Or is there a more elegant method?
> 
> Below is a snippit of the JS I'm fumbling through.
> 
> Any advice is much appreciated!
> 
> Kelvin
> 
> window.onload = function (){ ...
> 
>             layer = new OpenLayers.Layer.Vector(
>                 "Marker Drop Shadows",
>                 {
>                     styleMap: new OpenLayers.StyleMap({
>                         // Set the external graphic and background
> graphic images.
>                         externalGraphic: "img/marker-gold.png",
>                         backgroundGraphic: "img/marker_shadow.png",
> 
>                         // Makes sure the background graphic is placed
> correctly relative
>                         // to the external graphic.
>                         backgroundXOffset: 0,
>                         backgroundYOffset: -7,
> 
>                         // Set the z-indexes of both graphics to make
> sure the background
>                         // graphics stay in the background (shadows on
> top of markers looks
>                         // odd; let's not do that).
>                         graphicZIndex: MARKER_Z_INDEX,
>                         backgroundGraphicZIndex: SHADOW_Z_INDEX,
> 
>                         pointRadius: 10
>                     }),
>                     rendererOptions: {yOrdering: true}
>                 }
>             );
> 
> 
>           map.addLayers([mapnik, layer]);
>           map.setCenter(centre, zoom);
> 
>             var dragFeature = new OpenLayers.Control.DragFeature(layer);
> 
>             map.addControl(dragFeature);
> 
>             dragFeature.activate();
>             drawFeatures();
> }
> 
>         function drawFeatures() {
> 
>             layer.removeFeatures(layer.features);
> 
>             // Create features at random around the center.
>             var center = map.getViewPortPxFromLonLat(map.getCenter());
> 
>             // Add the ordering features. These are the gold ones that
> all have the same z-index
>             // and succomb to y-ordering.
>             var features = [];
> 
>                 var lonLat = new OpenLayers.LonLat({{ coords }});
>                 features.push(
>                     new OpenLayers.Feature.Vector(
>                         new OpenLayers.Geometry.Point(lonLat.lon,
> lonLat.lat)
>                     )
>                 );
> 
>             layer.addFeatures(features);
>         }
> 
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