[OpenLayers-Users] help with geolocation/jquery/modernizr script: uncaught type error.

[Nicholas Efremov-Kendall]

Hi all,

I've hacked together a geolocation script using the OpenLayers demo, a
tutorial on Mobile Tutorials
http://mobile.tutsplus.com/tutorials/mobile-web-apps/html5-geolocation/, and
a couple of other OL-Geolocation demos out there. Independently, I've gotten
the parts of the script to work, but I'm not sure what's happening here when
bring them all togehter and use jquery for my button firing.

The script calls the initGIS function onLoad loading a simple map set to a
lonlat. The button then fires the geolocation script, which uses modernizr
to check for geoloc support, provides error checking and olderbrowser
support via YQL (maybe I should use the MIT-license geo.js? suggestions).
The script was breaking on adding the markers, but I realized that I had to
declare some of the variables as globals. The issue now is a rather opaque
error in the OL code saying "Uncaught TypeError: Object function (){var
a=null;if(this.baseLayer!=null)a=this.baseLayer.projection;return a} has no
method 'getCode'"

Firefox returns the following error.

attempt to run compile-and-go script on a cleared scope

The chrome error says the script breaks at OL line 311, while FF says that
the script is breaking at OL 256. This is above my programming experience,
and I'm not sure how to resolve this error.

code is as follows with the error checking functions cut off the end of it.

var markers = new OpenLayers.Layer.Markers("Markers");
var map = new OpenLayers.Map('map');
function initGIS(){
map.addControl(new OpenLayers.Control.LayerSwitcher());
var mapnik = new OpenLayers.Layer.OSM();
map.addLayer(mapnik);
map.setCenter(new OpenLayers.LonLat(-90, 38).transform(new
OpenLayers.Projection("EPSG:4326"),map.getProjectionObject()),12);
}

jQuery(window).ready(function(){jQuery("#btnInit").click(getLoc);});
function getLoc(){
if (Modernizr.geolocation) {
 navigator.geolocation.getCurrentPosition(showMap,handle_error);
} else {
yqlgeo.get('visitor',norm_yql_resp);
}
}


function showMap(position)
{
//alert('Lat: ' + position.coords.latitude + ' ' + 'Lon: ' +
position.coords.longitude + ' ' + 'Acc: ' + position.coords.accuracy);
var lonlat = new
OpenLayers.LonLat(position.coords.longitude,position.coords.latitude).transform(new
OpenLayers.Projection("EPSG:4326"), map.getProjectionObject);
markers.addMarker(new OpenLayers.Marker(lonlat));
map.setCenter(new OpenLayers.LonLat(lonlat, 12));
map.addLayer(markers);
}
}
</script>
</body>
</html>
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