Problem with dojo in JavaScript?

Question

Sorry I can't be more specific in the title. The other day, 2 of my JavaScript maps stopped working properly while a third kept working. The only thing the two that stopped working have in common is that they contain dojo elements. I brought up Firebug, and received this error when trying to load:TypeError: Unable to draw graphic (geometry:null, symbol:null): this._gc is null
[Break On This Error] if(!dojo._hasResource["dijit._base.man...h","tr","xyz","zh","zh-cn","zh-tw"]);
arcgis?v=2.4 (line 48)

Line 48 in my code is CSS- in ESRI's JavaScript document, at http://serverapi.arcgisonline.com/jsapi/arcgis/?v=2.4, it contains information about Dojo. Is this a known error, or did I screw something else up? Changing to version 2.3 through 2.1 did not fix my problem, either.

BenReilly · Answer

Looks like I got caught up in trying to figure out the error message, and forgot to change the spatial extent from a previous basemap I was using. (The basemap in my posted code was supposed to be on. I had turned it off temporarily trying to trouble shoot).

Thanks to everyone for helping me figure out another rookie mistake.

derekswingley1 · Answer

Adding a base map, creating the extent before referencing it in the map constructor and creating an extent with a spatial reference that matches the basemap's gets it working for me. Take a look at the attached, modified version of your code. No problems with dojo...

uww_buildings.html.zip

StephenLead · Answer

Ben,

It's hard to test this exactly since we don't have access to your internal server, but here are some suggestions.

Define startExtent before assigning it to the map:
 var spatialRef = new esri.SpatialReference({wkid:102100});
 var startExtent = new esri.geometry.Extent();
 startExtent.xmin = -9879338;
 startExtent.ymin = 5286787;
 startExtent.xmax = -9878257;
 startExtent.ymax = 5287623;
 startExtent.SpatialReference = spatialRef;

map = new esri.Map("mapDiv",{extent:startExtent });

Rather than calling:
  dojo.addOnLoad(init);
  dojo.addOnLoad(initParking);

call initParking in the map's onLayersAddResult event:
dojo.connect(map, "onLayersAddResult", initParking);

Does that make any difference?

Steve