Vanilla JavaScript Form Validation

Hi, My name is Andy Leverenz and I work as a product designer and developer. For fun, I design, code, and write. Check out my blog called Web-Crunch https://web-crunch.com where I publish design and development tutorials with the occasional vlog.

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CodePen Link: https://codepen.io/webcrunchblog/pen/ZEWwvZy

Front-end JavaScript validation is a godsend when you don't want to perform countless validations on the back-end portion of a given web application or website. This guide teaches you my approach towards front-end validation using vanilla JavaScript.

We don't need frameworks or fancy plugins to make this work. Those come in handy if you find yourself doing things over and over but my best advice is to always start as lean as you can and scale your dependencies from there.

I created this all on a CodePen for your viewing pleasure. You can tweak it further and/or compare your version against mine if you decide to follow along (I recommend following along to learn by doing!).

For our validations to work properly we'll need some foundational HTML and CSS. Because this guide is primarily focused on JavaScript I'll skim through the HTML and CSS quickly.

Continue reading: https://web-crunch.com/posts/vanilla-javascript-form-validation

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