In the Grails projects I participated in, we did not use a plugin, but rather a mashup of javascript plugins and custom validators (jQuery, Prototype, Dojo plugins, etc.) to reach the client side of Validation. It is convenient for instant field level verification on the client.
According to leebutts, the source of these plugins is open. Why not consider expanding one (or both) of these plugins to achieve what you need and contribute to the community?
Maybe you should check out the new plugin. With it, Constraints becomes an artifact of Grails and can facilitate this work.
Colin harrington
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