Our team has been using JqGrid on a few projects now and I am really impressed with the ease of use and functionality it provides. Out of the box it gives us immediate benefits in the form of paging, sorting, and basic transformation of tables. ASP.NET MVC makes it easy to send and receive data from the grid without writing much code at all. In this post we will look at a basic class to handle the parameters passed from JqGrid in regards to current page, records per page, sort column, and sort order.

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The asynchronous nature of GWT makes for more powerful and usable web applications, but as a developer, it can take a little while to get used to. Here’s one example: imagine a scenario where some client-side class needs to call two service operations before it can do something. Simple, right? In a synchronous world, it would be…

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Problem: Application began spewing out the following error when clicking on our Ajax-ified radio buttons:

java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "org.ajax4jsf.org.w3c.tidy.DOMNodeImpl.setUserData(Ljava/lang/String;Ljava/lang/Object; Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;" the class loader (instance of com/ibm/ws/classloader/CompoundClassLoader) of the current class, org/ajax4jsf/org/w3c/tidy/DOMNodeImpl, and the class loader (instance of ) for interface org/w3c/dom/Node have different Class objects for the type

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It’s very tempting, given the power and ease of GWT, to jump in head-first and start building flashy new RIA applications for your customers right away. Slow down! Although I’m not generally an advocate of big design up front (BDUF), there are a few usability requirements that I think you’ll want to understand before you start coding – requirements that will fundamentally shape how you design your client-side GWT architecture, and therefore minimize re-work later.

So, toward the goal of evoking usability requirements, here are 6 important questions to ask your users or business owners:

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