Knockout Validate Demo

A simple sign up form

An Overview:

• Knockout validate allows you to add any kind of validation logic to your observables.
• This is one of the simplest examples, using knockout validate to do form validation.
• When the validation logic fails or succeeds, the flag set on the validated observable is updated, in turn updating the UI.
• Along with the flag settings, fail and success callbacks also trigger.
• To demonstrate the fail handler, look at the email observable setup, and try writing "trickster" in the email field
• It's very easy to setup observables with validation.
• You can use validation with ANY regular knockout observable. Objects, strings, integers, anything.
• It's simple, if the validation fails, the observable does not change and subscribers are not notified.
• If validation succeeds, the observable changes.
• On every validation, callbacks are made that are specified by you! Success, failure and even 'always' that fires on every validation
• If the value does not change, nothing happens (including the always callback). Ex: myObservable(myObservable()) does nothing.

The Code

This particular example uses the global namespace and by default is named kov to mimic ko. See the README on how to use with require.js