javascript, dojo, building dialogs in jsp's with enclosures

I am using closures in dojo dialogs to keep functions and variables from colliding.

I have a jsp page that includes a complex dialog. It is mostly working. Just one really annoying detail. if the widget changes how do I notify a handler method? we want as much of the java script for the dialog 开发者_如何学Cto be kept within the closure.

Since the popup appears in multiple locations I want future programmers to be able to replace myVar with anything. Is there a way to determine what to correctly put in the onChange

------jsp page-----

var myVar = new MyNewPopupStuff(42);

myVar.contstrucDialog();

......

includeTemplate template="myDialog.jsp"

.....

function MyNewPopupStuff(param){

     this.contstrucDialog = function()
     .......
     while( more widgets to add){
           fieldHolder=dojo.byId("myDialogData"
     addWidget(widgetName,myDialogData);
     }

     addWidget = function(fieldHolder, widgetName){
     // need to print the name of the variable in "myVar.bar()" (myVar or what ever it may be)
     dojo.place(newLabel, fieldHolder);
        var newField = new dijit.form.ValidationTextBox({
        id: "i"+contactTypeId,
        name: widgetName,
        value: value,
        trim: true,
       **onChange:**??????when the widget is mofied I want to call the below modifyOnChange not some other modify on change  I think I want something like myVar.modifyOnChange????

    });
    }


    this.modifyOnChange = function()
     {
         alert("modified");
     }
}

If you're using a framework that implements the EcmaScript 5 bind method for functions, use:

onChange: modifyOnChange.bind(this),

else implement it yourself with:

onChange: (function(self) {
    return function() {
        return modifyOnChange.apply(self, arguments);
    }
})(this),

myVar.modifyOnChange might work, but what's the point of abstracting stuff into a class if you then tie the code to the global you expect to be holding the object? And what happens if somebody wants to add another MyNewPopupStuff object?