In this context, the only thing Bootstrap would care about is a handful of class names and where you stick the divs.

I get it, but this is my least favorite reason.

They promised you it 'Works with Bootstrap!' and your project uses Bootstrap, so that seemed like a good fit. Remember that native HTML constraint validation is all about HTML attributes controlling form validation, so ideally any third-party form validation library would use them in the spirit of progressive enhancement. Sometimes the nicest JavaScript API's start with HTML attributes for activation and configuration. If it makes your code easy to understand and work on, that's a big deal. One of the major reasons any framework enjoys success is because of API nicety. I'll leave that to you to look into when you need to reach for this kind of thing. The hope is that these libraries are nice and lightweight because the take advantage of the native API's when they can. angular-form-validation or angular-validation for Angular.Or Formik, which looks to be built just for this kind of thing: You might reach for a package like react-validationthat helps out in that world. You can absolutely do all that with native form validation and native constraint validation, but it also makes sense why you might reach for an add-on designed for that. You might be passing values to a form element via props and setting error data in state. When you're working with a framework like React, you aren't really attaching event handlers or inserting anything into the DOM manually at all. #You're using a JavaScript framework that doesn't want you touching the DOM yourself. Libraries like Parsley go down a smidge further, to IE 8. But it's not inconcievable that you need to go even deeper. So what's up with third-party form validation libraries? Why would you use a library for something you can get for free?Īll 'modern' browsers + IE 9 down is pretty good, especially when you've accounted for cross-browser differences nicely as Chris did. Chris even showed us that with a litttttle bit more work we can get down to IE 9 support with ideal UX. These days, browsers have quite a few built-in tools for handling form validation including HTML attributes that can do quite a bit on their own, and a JavaScript API that can do even more. We've just wrapped up a great series of posts from Chris Ferdinandi on modern form validation.

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