I have a HTML5 web application with numerous user-entered fields, and I would like to do some client-side validation on those fields in javascript before sending them to the
You will have to wrap your fields within a form to use the validation plugin and it's a good practice anyway. Also, you can invoke the plugin's validation programmatically and check if the form is valid by doing:
var $form = $('#your_form'),
validator = $form.validate({...});
//validate the form
validator.form();
//check if the form is valid
if ($form.valid()) {
//form is valid
}
For more options, have a look at the docs.