W3 validating

6854933580_2c8b688306_z

provides a declarative way of validating javascript objects.

It is unit tested with 100% code coverage and can be considered fit for production.

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Pages may not display as intended in all browsers, even in the absence of validation errors and successful display in other browsers.

is an open source component of Wrapp and is licensed under the MIT license.

There are no required external dependencies at all!

So if an older browser doesn't support them, the fact that they're in the HTML won't 'break' anything, they’ll just be rendered as an .

NB While client-side form validation is great for enhancing user experience—fast, instant feedback to the user without making a round trip to the server—you will still need to validate any data submitted on the server, too.

Mark-up validators cannot see the "big picture" on a web page, but they excel at picking up missed closing tags and other technicalities.

DTD-based validators are also limited in their ability to check attribute values according to many specification documents.

Strictly speaking, you should make sure you're using the HTML5 DOCTYPE, otherwise you'll run into HTML validation errors.

But the great thing about them is that they all degrade gracefully.

A few months ago Sandeep introduced us to the HTML Constraint API, showing how we can use the new HTML5 input types and attributes to validate our forms in the browser with minimal Java Script.

Today I’m going to walk you through validating a simple booking form by using the Constraint API, and keep an eye on how you can make sure your forms stay accessible too.

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