where record validation manners form information web application?


say have web form fields wish countenance wholly subset alphanumeric, smallest border length etc.



you countenance fan javascript, post information behind server news behind user, presumably around ajax not. have validation manners database pull behind blunder messages user way.



or any multiple above.



if wish unparalleled place keep validation manners web concentration user information insist database, best practices, patterns whole good recommendation doing so?



[edit]



i have edited doubt due improved simulate tangible question! good answers distant btw.



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