Validating user entry
Sometimes it can feel frustrating for a site visitor when they have to submit a form several times over, correcting errors that they've made filling it out. Without JavaScript, the only way to validate the information the site visitor has entered is to wait for them to submit the form, then identify the issues on the server, and send back a page that contains the form along with any error messages that might help the site visitor correct the problem.
Showing errors as soon as they happen goes a long way toward making your form feel snappy and responsive and helping your site visitors submit the form correctly on the first try. In this section, we'll learn how to use the Validation plugin from Jörn Zaefferer. This plugin is ...
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