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Nalezeno "JavaScript": 807

How to Detect Failed Requests via Web Extensions

2.10.2023
One of the best things that ever happened to t he user experience of the web has been web extensions. Browsers are powerful but extensions bring a new level of functionality. Whether it’s crypto wallets, media players, or other popular plugins, web extensions have become essential to every...

Sum an Array of Numbers with JavaScript

7.9.2023
It’s rare that I’m disappointed by the JavaScript language not having a function that I need. One such case was summing an array of numbers — I was expecting Math.sum or a likewise, baked in API. Fear not — summing an array of numbers is easy using Array.prototype.reduce!...

JavaScript waitFor Polling

14.8.2023
As more of the JavaScript developers write becomes asynchronous, it’s only natural to need to wait for conditions to be met. This is especially true in a world with asynchronous testing of conditions which don’t provide an explicit await. I’ve written about waitForever...

queryLocalFonts

11.8.2023
One of the larger downloads when requesting a webpage are custom fonts. There are many great techniques for lazy loading fonts to improve performance for those on poor connections. By getting insight into what fonts the user has available, we can avoid loading custom fonts. That’s where...

Use XHR/fetch Breakpoints!

7.8.2023
Web debugging tools are so incredibly excellent these days. I remember the days where they didn’t exist and debugging was a total nightmare, even for the simplest of problems. A while back I introduced many of you to Logpoints, a way to output console.log messages without needing to change...

URL.canParse

17.7.2023
Parsing of URLs on the client side has been a common practice for two decades. The early days included using illegible regular expressions but the JavaScript specification eventually evolved into a new URL method of parsing URLs. While URL is incredibly useful when a valid URL is provided,...

JavaScript closest

5.7.2023
When it comes to finding relationships between elements, we traditionally think of a top-down approach. We can thank CSS and querySelector/querySelectorAll for that relationship in selectors. What if we want to find an element’s parent based on selector? To look up the element tree and find...

JavaScript: Reverse Arrays

26.6.2023
Manipulating data is core to any programming language. JavaScript is no exception, especially as JSON has token over as a prime data delivery format. One such data manipulation is reversing arrays. You may want to reverse an array to show most recent transactions, or simple alphabetic sorting....

#posobota 29.4. na téma synchronization

23.4.2023
Opět naživo, offline. V Praze v kancelářích LMC – Menclova 2538/2, Praha 8-Libeň Letos poprvé a naposledy v Praze. Čeká na vás 6 řečníků napříč tématy mezi backendem, frontendem a přesahem do softskills. Program Vstup…

JavaScript Array Group

17.4.2023
Managing, sorting, and manipulating data with JavaScript is a skill we’ve often delegated to third party libraries like lodash. As the JavaScript language progresses, however, these features eventually get. added to the JavaScript specification. Two such APIs for grouping of Array data...

How to Get a Base64 Version of a File From Command Line

13.4.2023
A while back I wrote an article on how to Convert Image to Data URI with JavaScript. It’s a neat trick developers can use for any number of reasons. Instead of abusing canvas, however, why not simply get the base64 data from command line? You can use base64 and pbcopy to convert a file...

Detect the Content Type in the Clipboard

6.3.2023
A user’s clipboard is a “catch all” between the operating system and the apps employed on it. When you use a web browser, you can highlight text or right-click an image and select “Copy Image”. That made me think about how developers can detect what is in...

Healthcare, Selling Lemons, and the Price of Developer Experience

9.2.2023
Every now and then, a one blog post is published and it spurs a reaction or response in others that are, in turn, published as blogs posts, and a theme starts to emerge. That’s what happened this past week and … Healthcare, Selling Lemons, and the Price of Developer Experience...

fetch with Timeout

16.1.2023
A few years back I wrote a blog post about how write a fetch Promise that times out. The function was effective but the code wasn’t great, mostly because AbortController , which allows you to cancel a fetch Promise, did not yet exist. With AbortController and AbortSignal available...

Customizing HTML Form Validation

9.1.2023
Form validation has always been my least favorite part of web development. You need to duplicate validation on both client and server sides, handle loads of events, and worry about form element styling. To aid form validation, the HTML spec added some new form attributes like required and pattern...

How to Determine a JavaScript Promise’s Status

3.1.2023
Promises have changed the landscape of JavaScript. Many old APIs have been reincarnated to use Promises (XHR to fetch, Battery API), while new APIs trend toward Promises. Developers can use async/await to handle promises, or then/catch/finally with callbacks, but what Promises don’t tell...

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