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Standalone
Validatious requires no JavaScript library. However, if you're already using one, Validatious can easily work with it, and even benefit from it.
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Cross browser
IE6+, Firefox 2.0+, Opera 9.5+, Safari 3.0+, Chrome
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Easy to use
Validate forms with Plain Old Semantic HTML (yes, that's POSH) and/or a simple JavaScript DSL:
validate( "email".is("required").andIsAn("email") ); -
Customizable
Several settings allow you to control how and when Validatious does validation, how it displays errors and more. If configuring isn't enough, callbacks and easy overriding gives you complete control.
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Extensible
Add custom validators with only a couple of lines of JavaScript.
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Multilingual validation
Validatious lets you easily use different languages.