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The small amount of time that it takes it takes to validate server side, that is saved by your java script isn't all that important -- especially if that validation method makes the site unusable to anyone who may be a paying customer."Anything scripted that runs on the client side is stuff that obviously can't be important, period."
I consider my users, and their experience, very important.
And that's fine... as long as I don't need to execute your javascript to get the next page, use your navigation, and/or see your content. "If I'm stranded at checkout because of having js turned off, I can't buy your products -- so I'll shop elsewhere. That's not only money you lose, but money your competitor gains.But for writing dynamic content to windows, I use client-side as I've described. I also use JavaScript to make sure all forms are properly filled-out, numbers are formatted, etc. not as a security measure for my application, but as a convenience to the vast majority of my users.