There are many JavaScript frameworks available today for programming rich client-side interactions in web applications. With many such different options, it is important to choose a framework that not only serves your current requirement, but also serves you in the long run. We drew up a visual comparison between Ext JS and four other popular JavaScript frameworks: Prototype, Dojo, JQuery and YUI. Our detailed comparison spanned 20 different attributes. In addition to feature-set and technical comparisons, we also looked at parameters such as community support, design principles and quality of documentation and samples to provide a sense of the framework's durability.

Overall, Ext JS and JQuery came out strong with respect to their support of basic technical features. Both are upcoming frameworks that show commitment towards robustness of design and conceptual modeling that is needed for serious web applications. Ext JS has a rich library of widgets, both of them integrate with other JavaScript libraries in some manner, and both can model complex user interactions in their own way. Ext JS is emerging as an "industry-strength" framework and is being increasingly used in the enterprise. Ext JS also supports a robust client-side data model and support for component model and design patterns.

Your initial choice of JavaScript framework is an important one and the differences between these frameworks can be subtle. Being client-side technologies, these frameworks handle multiple priorities like usability, scripting ease, support for browsers, performance and many others, and making an informed choice about these technologies requires thorough analysis.

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