Loads the Surface with the given ID and invokes the given callback. If the surface has not yet been created this call is
placed in a queue and will be resolved at such time as the surface gets created.
Parameters
surfaceIdOrCallback: string | LoadSurfaceCallback
ID of the Surface to retrieve, or callback to hit - you can leave this parameter out and
JsPlumb will use the default surface id.
Optionalcallback: LoadSurfaceCallback
Callback function to hit once the Surface has been retrieved.
Loads the Surface with the given ID and invokes the given callback. If the surface has not yet been created this call is placed in a queue and will be resolved at such time as the surface gets created.