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ZK is an open source asynchronous Ajax + Mobile framework which is designed to maximize enterprise operation efficiency and minimize the development cost by enabling the creation of rich graphical user interfaces for Web applications with little programming (basic knowledge of Java, HTML and XUL). It lets developers write Web 2.0-enabled, rich Internet application without needing a single line of JavaScript code.

This framework consists of an Ajax-based event-driven mechanism, over 123 XUL and 83 XHTML-based components, together with its own markup language for designing user interfaces. The mark-up language is very powerful. Instead of using other mark-up languages, ZK has a component based markup language called ZUML. ZK's AJAX engine consists of both client and server components that communicate with one another.

The most powerful feature of ZK is its rich set of control libraries for user interface development.

ZK supports JSP/JSF/JavaEE/Spring., Ajax Push, and Ajax script in Java/Ruby/Groovy/Python/JavaScript.

 ZK 7.0.2

Free to download



Potix Corporation


System Requirements
Java Runtime Environment 1.4 or higher
Web server supporting Servlet 2.3 or higher

Forums, Blogosphere, Demo, SourceForge Project Page, ZK Forge

Selected Reviews:, The Server Side, Dr Dobbs,

Features include:

  • Declarative high level specification of rich (rather than plain HTML) user interfaces. For example the XUL widget set includes support for trees, comboboxes, bandboxes and sliders
  • Embedding scripting support with Java (Beanshell).. Optional support for other serverside Java scripting in other languages such as JavaScript (Rhino), Ruby (JRuby), Python (Jython) and Groovy
  • High level Ajax support. User input passes from the browser to the serverside desktop model over Ajax
  • Event-driven component-based model (similar to desktop programming models)
  • Fast prototyping
  • Support for creating user interfaces using different patterns. A MVC programming approach can be adopted with all events forwarded to a central controller class. Alternatively event handlers can be defined within the page using zscript. The MVC page approach is analogous to Swing programming and the in-page approach is analogous to DHTML programming on the server
  • Support for integrating with existing web frameworks via a JSP custom tag library, JSF support and a Servlet Filter. Has support for Spring and Hibernate
  • Extensible in that programmers can create new custom UI controls. Groups of controls can be re-used as a macro component
  • Databinding capability via in-page annotations that transparently bind screen controls to the fields of POJOs on the server
  • Over 200 off-the-shelf state-of-art XUL/HTML-complaint Ajax components
  • Numerous third party widgets: JFreeChart, JasperReports, Google Maps, FCKeditor, Timeline, Timeplot, ExtJS, Dojo etc.
  • CSS-based skinning, template-based looks and customizable behavior
  • Drag-and-drop, animation, context menus, and so on
  • Bookmark management and SEO (Search Engine Optimization) supported
  • Supports high scalability and availability with serializable user interfaces and a pluggable failover manager
  • Enterprise support

ZK in action

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Last Updated Saturday, May 31 2014 @ 05:19 AM EDT

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