The AJAX classes utilize a relatively small script library to provide the client side application services for the various controls. The library addresses several areas:

• Networking
  Provides the basic networking XMLHTTP functionality for client side applications through the wwHTTP class. wwHTTP handles making the remote call, callback routing to a result handler and handling errors and routing them to an optional error handler. There's also a client side wwCallbackMethod class that can be used to call server side function using a specific protocol recognized by the wwMethodCallback server control. This mechanism allows routing client callbacks to specific FoxPro methods using JSON message formatting.

• Client Classes Mappings for Server Controls
  This is the main feature of the library and it provides client implementations of the server side classes. Classes include wwCallbackMethod, wwHoverPanel, wwModalDialog, wwDragPanel. The server controls typically generate code using these client side controls to perform their work. The client side controls can also be used independently of the server controls (except the wwCallbackMethod class which relies on the server side to parse the specific message format).

• DOM and Browser Abstraction
  Browser independence is an important issue for AJAX applications and several classes provide common functionality in a browser independent manner. wwControl is a base HTML DOM element wrapper that provides many common features like getting and setting position and dimensions of elements, setting transparency, showing and hiding, applying shadows, assiging text and HTML etc. wwList extends wwControl and provides specific support for SELECT lists by allowing databinding from arrays and 'cursors/datatables'. wwToolTip provides an easy way to create a tooltip display on a control.

• Utility Classes
  A number of utility classes provide wrappers around common operations. wwUtils provides some generic common functions, wwEvent is a browser independent wrapper around the DOM event object, wwDebug provides the ability to easily output debug data without stepping into a debugger.
  

The library functionality can also be used independently of the Ajax features. For example the wwControl class provides some useful client side, browser indpendent formatting and UI effects functionality that has nothing to do with the callback framework, yet it's used by the callback framework.

Class	Description
Client Class wwCallbackMethod	This javascript class allows making remote method callbacks to the server using JSON messaging. The control calls back to ASPX pages or control on a page that contain methods marked up with a [CallbackMethod] Attribute.
Client Class wwHoverPanel	This class provides easy to use pop up window functionality by calling back to a URL and retrieving the result content directly into a panel. Options allow for easy placement of the window and various simple effects like shadows and opacity of the window.
Client Class CallbackException	The Callback Exception object is used to return errors from any callbacks. Any errors are always routed to the callbackErrorHandler specified on the client control (or parameter if available).
Client Class wwControl	The wwControl class is a thin wrapper around HTML DOM controls that provides browser independent functionality for a handful of common behaviors and operations as well as some useful and frequently resusable visual effects. There are two ways you can get a reference to a wwControl from a DOM element:
Client Class wwList	Provides a thin abstraction for a SELECT list that works for list boxes and drop down lists. Provides the ability to add items, clear the list and perform databinding to object arrays and DataTables returned from the server.
Client Class wwToolTip	Simple class that provides a tooltip behavior to an existing control.
Client Class wwModalDialog	This class allows creating a modal dialog that hides the background of the Web page using an opaque overlay and then pops an HTML element of your choice on top of it. The element (typically a Div tag) should also contain a button or hyper link used to close the dialog.
Client Class wwDragBehavior	This class provides a Drag Behavior to existing DOM elements on a page by attaching to a specific window and a Drag Handle. A Drag Handle is a 'hot spot' that acts as the initiation point to start a drag operation.
Class wwEditable	Extender class that makes a single DOM content element editable. Typically it is used with text div tags or more commonly yet with table cells.
Client Class wwHttp	The wwHttp class provides a thin wrapper around the browser XmlHttp object to allow making callbacks. The control manages hooking up a callback handler and managing errors by calling the callback handler or error handler when the calls complete.
Client Class wwUtils	Class with a few utility functions that are used throughout the library.
Client Class wwDebug	This class provides minimal debug trace functionality that allows capturing debug messages and storing them to a string. The messages are captured in a buffer that can be retrieved with toString().
Client Class wwEvent	A wrapper around the DOM event class that provides access to the event source, page and container relative x and y positions and the ability to hook up events in a browser consistent way.
Client Class JSON	The JSON class provides the ability to parse JSON on the client side. This is a static object that is always available.
Global Functions and Objects	The library also includes a handful of global functions that are provided as wrappers for other functionality in easy to use single line command style syntax.
String Class Extensions	Provides various extensions to the JavaScript String class.
Date Class Extensions	Extends the JavaScript Date class.
Number Class Extensions	Extends the JavaScript Number class with methods that act on the the number instance. o.Date