About the validation in web application development [duplicate]

This question already has answers here: Closed 12 years ago.

Possible Duplicate:

Why is client-side validation not enough ?

you have to validate data before store it.

validate in c开发者_运维百科lient side or server side or both?

what's your consideration?

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My consideration: both.

1. client-side - more user-friendly (e.g can respond right after leaving the field, no full-page reload, quicker response since no roundtrip network request, etc)

2. server-side - because you shouldn't trust the client

The drawback is of course maintaining the rules in both places, especially if they are in different languages/frameworks.