BusyIndicator for synchronous model

Question

Hello Experts,
I'm using a JSONModel in my SAPUI5 application.
The model data loading mode is synchronous and because of that I cannot use busyDialog (js is single threaded etc...).
I can change to model mode to asynchronous but in this case I'll have to use nested callbacks.
Can someone suggest a solution that avoids "callbacks hell" or still use synchronous model AND busy dialog.
Regards,
Omri

Answer 1

rrrr...
var bd = new sap.m.BusyDialog();
jQuery.sap.delayedCall(200, this, function () { bd.open(); });
try
     new sap.ui.model.json.JSONModel().loadData(..., null, false);
     bd.close();
catch(e){
     bd.close();