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copied!<p>Infeligo's answer is top notch. My experience may be of interest to some. I use Ruby on Rails as my server platform where the bulk of my business logic resides.</p> <p>At the front end I use dHTMLX which is a JS library of 'objects' the most powerful of which is their grid object. Most of my apps have business/accounting information processing/display requirements and the grid object is my mainstay there. However their object set is comprehensive including the ability to create additional 'windows' within the single application to provide a MDI type interface to the end user. I typically have a login form which when successfully applied opens a single HTML page with a menu at the top. Based on selection from the menu new windows are opened and closed to display / manipulate information. These windows are within the scope of the single HTML page.</p> <p>All the objects have very good events associated with them and I do quite a bit of validation at the front end using these events. However I usually duplicate all validation of data within the Rails Model as well. It's additional work but I'm just extra cautious. There are also a number of abstract objects that help to connect data between the front end visual objects e.g. grid and back end server. Most of the data connections can be done using XML or JSON. I use XML over JSON simply because of my experience with that structure and the fact that Rails provides a decent XML builder. So in my case I rarely use any Rails based views as all of my visual objects come from dHTMLX.</p> <p>The other thing I like about dHTMLX is the speed of their objects. For example the grid object will quite easily handle 10,000+ rows at very acceptable speeds.</p> <p>The BIG DOWNSIDE of the suite is it's documentation. The company is an eastern European developer and therefore it is often difficult to understand exactly what their documentation means. Also their documentation tends not to document everything completely and so a lot of time is wasted in trial and error type learning.</p> <p>Hope this helps</p>

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