Problem Extracting SRID using MapViewer JS API

Question

Dear All
I am developing an application using MapViewer 11g.
a) MapViewer JavaScript function mapview.getSrid() returns NULL for a map with SRIDS properly set in USER_SDO_GEOM_METADATA table and all the records of the table.
However I am able to retrieve the SRIDs properly by using a callback function as explained below
function loadMap()
var baseURL = "http://<servername>:8888/mapviewer";
var point = new MVSdoGeometry.createPoint(77.5,20.5,8307);
mapView = new MVMapView(document.getElementById("map"),baseURL);
mapView.addMapTileLayer(new MVMapTileLayer("mvdemo.india_map"));
mapView.setCenter(point);
mapView.setZoomLevel(3);
mapView.display();
*//This returns NULL*
alert("SRID " + mapView.getSrid());
However when I use
mapView.getMapTileLayerDefinition(mapCallback,"mvdemo.india_map");
//Load all relevant modules
//Callback function
function mapCallback(value)
     alert(value.coordSys.srid);    //This WORKS! returns the SRID 8307
+//Verified with FireBug Debugger+
b) I am in the process of using DOJO toolkitfor JS with MapViewer. I have just started this integration. But i havent come across any implementations in the past with DOJO.
I like to know about any implementation experience in this regard. Will compile and revert later.
Regards
Govindarajan
GIS Consultant

Answer 1

a) The map tile layer definition may not have been loaded by the time you first call getSrid().
Either define a callaback function in addMapTileLayer(mapTileLayer, callBack) or attach an event listener for MVEvent.INITIALIZE to mapview and call getSrid() in that.
b) Others have used mapviewer with Ext.js. That has worked well. Not sure about Dojo. Would be great to hear about your experience.