Extendable Class Pattern

[bocockli]

I have an increasing number of forms which seem to be sharing common code.

FormA = function() {
    
    // Here are common variables
    var msgBus = undefined;
    var formRecord= undefined;

    // This stuff is specific to each form
    var formPanel = new Ext.FormPanel({
        frame : true,
        labelAlign : 'right',   
        etc .....
    }

   // Here are some common functions
    function formUpdate() {
       ....
    }
    return { ......

So my question is, is there a pattern for creating a base form of some type in ExtJS which can be extended.

My thinking is either build a class extending Observable or create a generic Javascript object prototype.

In Java (sorry I understand Java better than jscript) I would just create a base class and extend;

class BaseClass{}
class FormA extends BaseClass{}
class FormB extends BaseClass{}

What is the best approach that is flexible enough?

Thanks, Len

[evant]

You can do the same:

BaseClass = Ext.extend(Object, {
    constructor : function(){
        //do stuff
    },

    method1 : function(){
    }
});

SubClass = Ext.extend(BaseClass, {
    constructor : function(){
        SubClass.superclass.constructor.call(this);
        this.method1();
    }
});

[bocockli]

Thank you, brilliant.