Build a dropdown menu, tooltip, auto-validation form, and an infinitely scrolling list, similar to the Twitter news feed.

Become a Front-end Developer

In this module, we’ll learn to apply our introductory knowledge of HTML, CSS, and JavaScript to build beautiful, real-world components. We'll go through the process of developing several complex components, including eBay's dropdown menu, Gmail's auto-validating form, Google's main autocomplete enabled search, Twitter's infinitely scrolling list, and Medium's tooltips.
We'll also learn how to approach common frontend challenges—what questions to ask, how to design solutions once we've thought of them, how to debug and work with mistakes, and more. By the end of this module, you’ll have acquired sufficient skills to build any website.

Projects

​To prepare for the error messages that display when validation fails, we should add some extra elements that can be dynamically populated. We'll also need to add another class to fields which are validated as improper, for additional clarity.

Let's look at the fully errored state.​

Let's display errors when the validation fails

A Dropdown Menu

Autocomplete Search

Tooltips

Autovalidating Form

An Infinite Scrolling List

From Toy Components to Production

Conclusion

Displaying Errors when Validation Fails