Form input validation

A general question I would like to ask is that when we create web-based applications what sort of validations do you think is better?

What I mean is that should the validation be checked on the client side (using JavaScript?) or on the server side.
One of my colleagues argued that validating on the client side is better than on server side, because you don?t want to overload the server. However I said that you cannot rely on the client as you in some cases might not know your audience and your validation may fail, also JavaScript sometimes causes a lot of problems.

So I would like your comments on whether to validate inputs on the client side or server side.

ps. sites like EE, Yahoo, Hotmail they all do validations on the server side (plus point I think :))
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glottisAsked:
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dorwardConnect With a Mentor Commented:
If you need data intergrety then the server is the only option. Anything done client side can be overridden by the user.

So use server side first, then consider saving bandwidth for you and the visitor by putting client side in as a secondary layer.
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glottisAuthor Commented:
will wait for some more comments
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nishikanthConnect With a Mentor Commented:
its better to the the validation on server side since the client side may feel if they have the disabled them.


http://www.asptechniques.com/content.asp?a=co&cID=949
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kmalhotraConnect With a Mentor Commented:
We usually find that a combination of client side and server side validations are the best. Somethings are checked on the client side and some on the server and some on both. The logic is that a client can disable the client scripting and bypass the validations so check them on the server.

But if the client-side scripting does work, then we know that we will save a round-trip.

Thanks
KM
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glottisAuthor Commented:
thanks for the answer
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