In the next article in this series, I'll show you how to use the native Constraint Validation API to bolt-in our desired UX with some lightweight Java Script.
Shows you how to write a script that ensures your form is filled in correctly before it's sent to your server.
While the Constraint Validation API is easy and light-weight, it does have some drawbacks.
You can style fields that have errors on them with the pseudo-selector, but you can't style the error messages themselves. Chrome doesn't display any errors until you try to submit the form.
It includes the entire j Query library, a third-party form validation plugin, and some custom Mail Chimp code.
In fact, that setup is what inspired this new series about modern form validation. In this series, I'm going to show you two lightweight ways to validate forms on the front end. I'm also going to teach you how to push browser support for these APIs back to IE9 (which provides you with coverage for 99.6% of all web traffic worldwide).
You don't need to do that when using HTML 5 type="date" attribute (the format then will be forced to be YYYY-MM-DD).The one included below was adapted from a project by Diego Perini, and is the most robust I've encountered.See the Pen Form Validation: Email & URLs by Chris Ferdinandi (@cferdinandi) on Code Pen.There are a few really awesome input types that not only validate dates but also provide native date pickers.Unfortunately, Chrome, Edge, and Mobile Safari are the only browsers that implement it. You should provide guidance to users of unsupported browsers about this format—something like, "Please use the YYYY-MM-DD format." However, you don't want people visiting with Chrome or Mobile Safari to see this since that's not the format they'll see, which is confusing.