setting the map extent in javascript

[NigelDsouza]

HI,

I am initializing a map without giving an extent or a center in the map constructor.

After this I am using the basemap gallery dijit and loading custom basemaps into it.

Post this, I am then adding  my operational layers to the map.

I want to then set the extent to the map but how do I know what co-ordinates to pass in?

regards,

Nigel

[JakeSkinner]

Hi Nigel,

The spatial reference of the map with be that of the first layer you add.  When setting the extent, you should use the coordinates of this spatial reference.

[NigelDsouza]

Hi Jake,

Thanks alot that's absolutely right. suppose I add my basecustom base map to the basemap array in the basemapgallery. Then how do I set this base map as the default basemap that should appear instead of setting someting like

map.basemap = 'topt' etc. I wouyld like to set my custom basemap when the map loads?

Regards,

Nigel.