Yav is a SIMPLE, POWERFUL and CUSTOMIZABLE javascript-based form validation tool.
(yav is a javascript form validator)

Below is a list of most important features:

• Many different validation rules
• onblur notification of errors
• Advanced pre-condition and post-condition rules
• Extendible and flexible: user can create his own validation rules
• onfocus auto-help
• Notification of errors classic and advanced, yet customizable
• Ajax support
• Cross-browser compatibility
• Only 17kb without external dependencies

Web Site
Demo
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