Javascript

I wanted to change the layout of [my blog](https://simonwillison.net/) on mobile screens such that the content from the "Elsewhere" right hand column combined with the main column in the correct order

A few notes on JavaScript `Date` object, based on trying to do some basic things with them in Observable notebooks. ## Parsing ISO format strings into a Date object I had date times that looked like

I had to figure this out while building [datasette-copyable](https://github.com/simonw/datasette-copyable/) - demo [here](https://covid-19.datasettes.com/covid/ny_times_us_counties.copyable?state=Texa

Callbacks for when elements are added or removed from the DOM. - indiana-university/when-elements: Callbacks for when elements are added or removed from the DOM.

A JavaScript tutorial designed for beginners. Well organized and easy to understand with lots of examples.

Tips, tricks and tutorials on the web’s most beautiful language.

Monitoring for changes to the DOM is sometimes needed in complex web apps and frameworks. By means of explanations along with interactive demos, this article will show you how you can use the MutationObserver API to make observing for DOM changes relatively easy.

The sophisticated Drag and Drop library you've been waiting for 🥳 - dflex-js/dflex: The sophisticated Drag and Drop library you've been waiting for 🥳

Closures Maybe you already have done an interview with the following question: Describe a...

Promises are arguably one of the trickiest concepts to grasp in the javascript world, and even if you know how to use them, it’s difficult to explain how they actually work. This FAQ style tutorial is meant for both beginners and intermediates in the world of promises. If you’re a beginner and have trouble grasping what a promise even is, then go on ahead and start from the first question.

Learn how to use Math.random to generate random numbers in JavaScript and create random colors, letters, strings, phrases, passwords, & more.

Explore some of the missing math methods in JavaScript — such as sum, product, factorial, odd and even — and how to write functions for them.

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In today's post, we'll learn what is nested objects and how to create them in JavaScript.

Accessing and modifying query string values using URLSearchParams

Inline validation in web forms is useful when it works, but frustrating when it fails. Too often it leads to an endless stream of disruptive error messages or dead-ends without any chance of getting out. Let’s fix it.

In this article, Jaun Diego covers the least known yet extremely useful APIs, such as the Page Visibility API, Web Sharing API, Broadcast Channel API and Internationalization API. Together we will see what they are, where we should use them, and how to use them.

Wrapping my head around Islands Architecture.

JSON Hero makes reading and understand JSON files easy by giving you a clean and beautiful UI packed with extra features.

The FormData interface provides a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the fetch() or XMLHttpRequest.send() method. It uses the same format a form would use if the encoding type were set to "multipart/form-data".

My attempt at a very basic explanation of the 'this' keyword in JavaScript.

Removing jQuery from GOV.UK was a huge yet manageable task that led to improved code and performance gains across the site. This is how and why we did this work.

This week, we looked at how to create custom events with vanilla JS, and a helper function to make things a bit easier. Today, we’re going to look at different naming conventions for custom events. To help prevent naming collisions, it’s a good idea to prefix custom events with your library or project name. // Namespaced to the Calculator library emit('calculator-add'); One common naming convention is kebab-case. // kebab-case naming emit('calculator-add'); Another convention is to put a colon (:) between the library name and the event type.

JavaScript provides developers with a way to emit custom events that developers can listen for with the Element.addEventListener() method. We can use custom events to let developers hook into the code that we write and run more code in response to when things happen. They provide a really flexible way to extend the functionality of a library or code base. Today, we’re going to learn how they work. Let’s dig in!

JavaScript has come a long way since I knew it as the “D” in DHTML. For anyone like me, who’s been reluctant to use the latest syntax that could require polyfills or a transpiler, I’ve written this cheatsheet to get you caught up on all the goodness that’s widely supported in modern browsers.

Recently built a demo that demonstrated a specific animation. Only problem: if you missed it, you had no way of restarting it. Instead of forcing the visitor to reload the page, this little JavaScript-snippet – attached to a button click – did the trick: const restartAnimations = ($el) = { $el.getAnimations().forEach((anim) = { anim.cancel(); anim.play(); … Continue reading "JavaScript: Restart all Animations of an Element"

In this article, we will push the boundaries of static rendering and learn how to apply it to personalized content. “Segmented Rendering” is a new pattern and it will change the jamstack game forever.