Cancel a React Modal with Escape Key or External Click

Lou Mauget Development Technologies, React, Tutorial Leave a Comment

Web application users are accustomed to canceling a popup (aka dialog or modal) by pressing the escape key, and many modals can even cancel if the user clicks outside it. How does a React developer code that without a plumbing mess between the modal and every visible component beneath it? How do you cancel a React modal with an escape key or external click?

I’m glad you asked because I have an answer. In this blog, I’ll show a pair of easy-to-use custom React hooks that simplify the task.

Updating Microservices with Netty 5, Kafka 3, and React: Whirlpool Revisited

John Boardman Development Technologies, Java, JavaScript, Microservices, React Leave a Comment

Back in 2015 and 2016, I wrote two blogs that went step by step to develop a microservice/Netty architecture with fully working code called Whirlpool.

A lot has changed in the years since, so recently I decided to come back to the project, update it with the latest versions of Kafka and Netty, and add a React UI to it (rather than the vanilla JavaScript version it used before). In addition, I also added Windows Subsystem for Linux (WSL) scripts in addition to the Mac and Linux scripts that were there before and made all of the scripts more robust.

This blog will be about the work that went into all of those updates, plus a look at the new React UI. This provides an excellent view into what it takes to update an outdated microservices application implemented with Kafka (version .9 –>3.0) and Netty (4.1.3->5.0.0-alpha2), bringing all versions up to date and adding a React UI. By the end you’ll be familiar with the latest versions of these frameworks, know some “gotchas” to avoid, as well as understand how to integrate WebSockets into React.

Why Functional Programming

James Slaughter Development Technologies, JavaScript, React 1 Comment

React has gotten a little funny of late – a few years ago, it was normal to embrace the Object-Oriented paradigm, writing each component as a class and doing lots of this-binding.

Today, however, hooks and functional components have taken over React, and with it, a style of programming unusual for front-end frameworks is growing in popularity: Functional Programming.

This programming style has been in use for many years: Lisp, Haskell, Clojure, and OCaml are all established, though mainly out of the mainstream, languages with a rich history and broad application. Thinking ‘functions are first-class citizens’ sounds strange, especially to new JavaScript developers who have spent most of their time in Python or Java that come from an Object-Oriented perspective.

That’s why in this post, we will go over the basics of Functional Programming, how we compose functions, a handy implementation of a ‘pipe’ function that will compose functions, the process of currying and functions-as-return-value, and how we can use these concepts in React using Higher-Order Components.