Dr. Dobb's Journal - February 2008 - (Page 64)

d02seku_p4ma 12/10/07 9:10 AM Page 64 Instantly Search Terabytes of Text N over two dozen indexed, unindexed, fielded data and full-text search options N supports hundreds of international languages N file parsers / converters for hit-highlighted display of all popular file types N Spider supports static and dynamic web data; highlights hits while displaying links, formatting and images intact N API supports .NET, C++, Java, SQL, etc. New .NET Spider API components by encapsulating pieces of ZUL or ZHTML code into a file. Then you can import such definitions to your own page, name them by some alias, and use them in the same way as standard ZUL components. Similar to JSP custom tags, you can pass parameters to a component defined in such a way by setting up attributes of the tag. These parameters are available in the code of the component—as variables with the same names as the attributes, but preceded by the prefix arg. Listing Twelve is a ZHTML example component, while Listing Thirteen (available online) shows its use on a ZUL page. Integration with HTML, JSP, and JSF ZUL code can be easily merged with HTML; for instance, to arrange ZUL controls with the help of HTML tables, or to use specific functionality such as sending e-mails from web pages. There are two methods for mixing together ZUL and HTML code. First, XHTML tags can be embedded into ZUL documents after declaring their appropriate namespace (see Listing Fourteen; available online). The second technique relies on using a special ZUL tag and with a fragment of HTML pasted in as its content (Listing Fifteen, available online). Today’s applications are usually built using many different technologies. ZUL pages allow easy integration with the existing code of the view layer, created via JSP or JSF. This is possible by applying tags on JSP pages, which incorporate ZUL fragments; for example: The most convenient way of describing web pages in the ZK environment is via the ZUL language New The Smart Choice for Text Retrieval ® since 1991 N “Bottom line: dtSearch manages a terabyte of text in a single index and returns results in less than a second” – InfoWorld N “For combing through large amounts of data,” dtSearch “leads the market” – Network Computing N dtSearch “covers all data sources powerful Web-based engines”– eWEEK N dtSearch “searches at blazing speeds” – Computer Reseller News Test Center See www.dtsearch.com for hundreds more reviews, and hundreds of developer case studies Contact dtSearch for fully-functional evaluations 1-800-IT-FINDS www.dtsearch.com 64 Dr. Dobb’s Journal l www.ddj.com l February 2008 ® ) Spider ($199 Desktop with $800) Spider (from Network with 99) ider (from $9 Web with Sp (from $2,500) CD/DVDs Publish for $2,500) Linux (from Engine for (from $999) Win & .NET Engine for & .NET ine for Win 64-Bit Eng JFreeChart (for generating advanced diagrams), the HTML graphic FCKEditor, and a border layout manager from the Ext JS library. They are integrated with the framework by being wrapped in ZUL tags. Listing Sixteen (available online) is an example of creating data presentations with the help of the tag, which gives access to JFreeChart functionality. Conclusion ZK seems to be one of the more interesting frameworks to come along and make web programming easier. Its strong suite includes browser interoperability, an eventhandling paradigm, MDI functionality, and a set of neat standard controls. And, according to test results, its performance looks decent. Emerging features include a ZK client for mobile devices and an expected Eclipse plug-in for the graphic design of ZULs. Lastly, ZK is intuitive and easy to use. Among the disadvantages, there is incomplete support for keyboard navigation over a GUI (for instance, for a menu component) and occasional problems with the localization of standard messages hidden in JavaScript files. DDJ ZUL pages can also include other resources served by a web container, such as servlets, JSP or JSF pages, or other ZULs or richlets. This is also accomplished by applying the tag: Integration with External AJAX Components Several open-source packages supporting the creation of advanced web interfaces are distributed with the ZK framework. Among them are an interface for Google Maps, http://www.dtsearch.com http://www.dtsearch.com http://www.ddj.com

Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - February 2008

Dr. Dobb's Journal - February 2008 Contents Hmmmm Alia Vox Developer Diaries Developer’s Notebook South American Software Development Conversations Inside Visual Studio 2008 BibPort: Creating Bibliographic References Continuous LINQ The ZK Framework Static Testing C++ Code The Agile Edge Effective Concurrency Swaine’s Flames

Dr. Dobb's Journal - February 2008

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