The jQuery Validation Plugin provides drop-in validation for your existing forms, while making all kinds of customizations to fit your application really easy.

Include jQuery and the plugin on a page. Then select a form to validate and call the validate method.

<form>
	<input required>
</form>
<script src="jquery.js"></script>
<script src="jquery.validation.js"></script>
<script>
$("form").validate();
</script>

For more information on how to setup a rules and customizations, check the documentation.

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using grunt.

If you've wrote custom methods that you'd like to contribute to additional-methods.js, create a branch, add the method there and send a pull request for that branch.

If you've wrote a patch for some bug listed on http://plugins.jquery.com/project/issues/validate, please provide a link to that issue in your commit message.

Copyright (c) 2012 Jörn Zaefferer Licensed under the MIT license.