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The core of ZK consists of an Ajax-based event-driven mechanism, over 123 XUL and 83 XHTML-based components, and a markup language for designing user interfaces. Programmers design their application pages in feature-rich XUL/XHTML components, and manipulate them upon events triggered by end user's activity. It is similar to the programming model found in desktop GUI-based applications. ZK takes the so called server-centric approach that the content synchronization of components and the event pipelining between clients and servers are automatically done by the engine and Ajax plumbing codes are completely transparent to web application developers. Therefore, the end users get the similar engaged interactivity and responsiveness as a desktop application, while programmers' development retains a similar simplicity to that of desktop applications. In addition to component-based programming in a manner similar to Swing, ZK supports a markup language for rich user interface definition called ZUML. * ZUML is designed for non-programmer developers to design user interfaces intuitively. * ZUML allows developers to meld different markup languages, such as Mozilla XUL language and XHTML, seamlessly into the same page. * ZUML allows developers to embed scripts in pure Java language (interpreted by BeanShell) and use EL expressions to manipulate the components and access data. |
