widget.js

var foo = {
	someMethod: function() {
		var $this = this;
		$this.someForm.submit(function() {
			$.post($(this).attr('action'), $(this).serialize(), $this._handleSearchResult, 'json');
			return false;
		});
	},
	_handleSearchResult: function(data) {
		//do something but have to access the widget here. this is just an ajax callback object
	}
};