[OpenLayers-Trac] [OpenLayers] #3571: moveTo generates "Uncaught TypeError: Cannot call method 'getLonLatFromLayerPx' of null"

[OpenLayers]

#3571: moveTo generates "Uncaught TypeError: Cannot call method
'getLonLatFromLayerPx' of null"
-----------------------------------------------------+----------------------
 Reporter:  outbreakmonkey                           |       Owner:  euzuro      
     Type:  bug                                      |      Status:  new         
 Priority:  minor                                    |   Milestone:  2.12 Release
Component:  Marker                                   |     Version:  2.11        
 Keywords:  moveto, typeerror, getLonLatFromLayerPx  |       State:              
-----------------------------------------------------+----------------------
 Using Chrome and Firefox, I get the following error whenever I try to move
 a marker.

 {{{
 Uncaught TypeError: Cannot call method 'getLonLatFromLayerPx' of null
 (Openlayers.js:2149)
 }}}

 Everytime I call moveTo on a marker, I get the Uncaught TypeError.
 It appears that this.map is null.

 The error appears to be in "OpenLayers.Marker.moveTo" in Openlayers.js.

 The error stops javascript execution, so as a temporary fix for my own
 site I've added
 (this.map)?this.map.getLonLatFromLayerPx(px):"";

 From my checks, it doesn't appear that this.map is ever set. Am I calling
 this wrong?

 FYI, map is set before the moveTo, because I'm able to set:

 markerpos=map.getLayerPxFromLonLat(newpos);

 I'm calling the map and moveTo as such:

 {{{
     <script language="javascript">
       var map;
       var fromProjection = new OpenLayers.Projection("EPSG:4326"); //
 transform from WGS 1984
       var toProjection = new OpenLayers.Projection("EPSG:900913"); // to
 Spherical Mercator Projection
       var markers=new OpenLayers.Layer.Markers("Markers");
       var size = new OpenLayers.Size(20,20);
       var offset = new OpenLayers.Pixel(-(size.w/2), -size.h);
       var icon = new OpenLayers.Icon('OpenLayers-2.11/img/locbox.png',
 size, offset);
       var currentposmarker=new OpenLayers.Marker(new
 OpenLayers.LonLat(<?PHP echo
 $curloc;?>).transform(fromProjection,toProjection),icon);

       function init() {
               var extent = new
 OpenLayers.Bounds(147.00,-39.00,155.00,-22.00).transform(fromProjection,toProjection);
               var options = {
                 restrictedExtent : extent
               };
                 map = new OpenLayers.Map("basicMap",options);
                 var mapnik = new OpenLayers.Layer.OSM();
                 map.addLayer(mapnik);
                         map.addLayer(markers);

                 var lonLat = new OpenLayers.LonLat(<?PHP echo $curloc;?>)
 //start lonlat
                   .transform(
                     fromProjection, // transform from WGS 1984
                     toProjection // to Spherical Mercator Projection
                   );
                         markers.addMarker(currentposmarker);
                 map.setCenter(lonLat,16); // Center of the map

                 refreshloop();
       }

   </script>

 }}}

 And Updating the location of the marker like so:

 {{{
 function processlocation(data) {
     var newpos=new
 OpenLayers.LonLat(data.longitude,data.latitude).transform(
       fromProjection,
       toProjection
     );
     markerpos=map.getLayerPxFromLonLat(newpos);
     map.panTo(newpos);
 }}}

-- 
Ticket URL: <http://trac.openlayers.org/ticket/3571>
OpenLayers <http://openlayers.org/>
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