I've been looking and it seems no-one has cracked this yet but I thought I'd ask the community here as well to see if anything came up.
Is there a way to get client-side validation (jQuery, Live Validation, whatever) to automagically get the validation rules from LLBLGen's built in validation?
LLBLGen (and others like Subsonic) already know that a field can't be null, must be less than 100 characters, etc and seems useful not to have to keep setting these all over the place.
Jquery.Validate is pretty awsome. It can validate credit card numbers, dates, min and max characters, and many other features. The link is here and it is very simple to use.
http://docs.jquery.com/Plugins/Validation
Basically all you do is register the .js file when loading up your page and when declaring the class of an input, put in "validate" or "validate date" or whatever and it will intelligently do it for you. Again they give examples and documentation in the link. Hope this helps you.
I'd say one has to create proper templates to ouput whatever validation code you want (or modify exisiting ones). I am not sure whether there are any existing but you can create them by yourself - it is pretty easy.
HTH
Check out xVal... it generates jQuery Validation based on validation found in your models.
Introduction to xVal blog post
I don't know how LLBL validation works or if there is any native support for it in xVal. But if there isn't, it would just be a matter of creating an IRulesProvider - no doubt it would come in handy to numerous other LLBL users.
I think something similar was done for the LightSpeed ORM. See here MVC and LightSpeed – Part 4 – Model Binding