Dojo Does Raise Exceptions

Dojo does raise exceptions in some cases. As I tried out some example codes from Dojo Quick Start Guide: Events, I got exceptions.

The following codes explains the case:

var mineObj = {
  aMethod: function() {
    console.log("Running mineObj method A");
  },
  bMethod: function() {
    console.log("Running mineObj method B");
    }
};
dojo.addOnLoad(function() {
  // run bMethod() whenever aMthod gets run
  dojo.connect(mineObj, "aMethod", mineObj, "bMethod");
  //dojo.connect(mineObj, "aMethod", mineObj, "bMethod1"); // exception!
  //dojo.connect(mineObj, "aMethod1", mineObj, "bMethod"); // OK
  // start chain of events
  mineObj.aMethod();
  //mineObj.aMethod1(); // JavaScript error!
});

The second connect(commented out) will throw an exception in FireBug:

uncaught exception: dojo.hitch: scope["bMethod1"] is null (scope="[object Object]")

The connect fails to invoke method bMethod1 as it is not defined. However, the third connect call is OK.

The last commented out code is a JavaScript error in FireBug:

mineObj.aMethod1 is not a function