Pliant - A flexible and extensible jQuery validation plugin

Pliant is a jQuery plugin for form validation, that tries to be very flexible as far as validation rules are concerned. It also allows defining rules via HTML comments.

Pliant - Features:

• Central, or field specific rule definitions.
• Rule inheritance and property overriding.
• Validation on field change.
• Field/Rule validation chaining.
• Apply validation on init, after init, or via HTML comments.
• Control field/rule message locations globally, or per field/rule instance.
• Control the form validation trigger, and scope.
• Stop validation on first invalid rule per field, or validate all rules per field.
• Ignore hidden/disabled fields.
• Customize element type and CSS for fields, messages, message containers, and message wrappers.
• Define expected return value for individual rules.
• Multiple event handlers allowed for field validation/focus/added, and form validation.