There and Back Again

AJAX library for Java generates JavaScript from Java classes. Proxy classes are used in JavaScript to call Servlet methods on the Java Tomcat server. Provides lots of examples to help you get started including a Multi-User chat example. Looks to support automatic fallback to iframes if XMLHttpRequest is not supported. Also has easy hooks for providing a global loading status.

Provides Cross Browser XMLHttpRequest based AJAX support, synchronous and asynchronous operation is supported. An object oriented api is offered to both JavaScript and PHP sides. Basic operation on the server side is provided by a server page where php objects you want to export are registered, this page is included in html pages with a client flag which generates proxy javascript classes with the same api as the php class (all class and method names are lowercase). Calls are made by creating an instance of the javascript class and then calling its methods. In async operation a callback class is specified when the instance is created, results are sent to methods with the same name as the called method. Provides complex datatype (multi-dimensional arrays and object) serialization and support for passing php errors to javascript, with configurable error handling on the javascript side.

OO PHP AJAX library, uses JSON as its serialization format, and supports events and HTML manipulation