widget.js

// our "Widget" object constructor
var Widget = function( options, element ){
    this.options = options;
    this.element = element;

    this._init();
};

Widget.prototype = {
    
    // _init fires when your instance is first created
    // (from the constructor above), and when you
    // attempt to initialize the widget again (by the bridge)
    // after it has already been initialized.
    _init: function(){
        // init code
    },
    option: function( key, value ){
        
        // get/change options AFTER initialization:
        // you don't have to support all these cases,
        // but here's how:
        
        // signature: $('#foo').bar({ cool:false });
        if( $.isPlainObject( key ) ){
            this.options = $.extend(true, this.options, key);
        
        // signature: $('#foo').option('cool');  - getter
        } else if ( key && typeof value === "undefined" ){
            return this.options[ key ];
            
        // signature: $('#foo').bar('option', 'baz', false);
        } else {
            this.options[ key ] = value;
        }
        
        return this; // make sure to return the instance!
    },
    publicFn: function(){ // notice no underscore
        return "public method";
    },
    _privateFn: function(){
        return "private method";
    }
};