2024-08-14
4030
#html
Glad Chinda
1855
Aug 14, 2024 ⋅ 14 min read

Programmatically downloading files in the browser

Glad Chinda Full-stack web developer learning new hacks one day at a time. Web technology enthusiast. Hacking stuffs @theflutterwave.

Recent posts:

How to use CSS line-clamp to trim lines of text

Master the CSS line-clamp property. Learn how to truncate text lines, ensure cross-browser compatibility, and avoid hidden UX pitfalls when designing modern web layouts.

Daniel Schwarz
Oct 30, 2025 ⋅ 3 min read
7 react Hooks you need to know

7 custom React Hooks every developer should be using

Discover seven custom React Hooks that will simplify your web development process and make you a faster, better, more efficient developer.

Murat Yüksel
Oct 30, 2025 ⋅ 8 min read
Understanding Promise.all in JavaScript

Is Promise.all still relevant in 2025?

In 2025, async JavaScript looks very different. With tools like Promise.any, Promise.allSettled, and Array.fromAsync, many developers wonder if Promise.all is still worth it. The short answer is yes — but only if you know when and why to use it.

Leonardo Maldonado
Oct 29, 2025 ⋅ 7 min read
the replay october 29

The Replay (10/29/25): Tiny AI agents, Next.js 16, and more

Discover what’s new in The Replay, LogRocket’s newsletter for dev and engineering leaders, in the October 29th issue.

Matt MacCormack
Oct 29, 2025 ⋅ 34 sec read
View all posts

5 Replies to "Programmatically downloading files in the browser"

  1. Hello. Great article! One comment though: in the function `downloadBlob` you declare a `clickHandler` that gets a value of an arrow function, which uses the `this` keyword. Since arrow functions do not have `this`, and you use `this` in a `setTimeout` callback function — it ends up being `undefined`, which throws when you perform the `.` operator on it (to call the `removeEventListener` method).
    Thanks for the article!
    Eran

  2. Hi Eran, thanks for pointing that out. That was an error on my part.

    The `clickHandler` function is supposed to be a regular JS function as opposed to an arrow function — that way, it would have the correct `this` binding internally (the target element) when it is eventually used as an event listener callback. If you notice in the subsequent Codepen snippets, you’d observe that the `clickHandler` function was defined as a regular function instead of as an arrow function.

    Thanks again for spotting that out.

Leave a Reply

Hey there, want to help make our blog better?

Join LogRocket’s Content Advisory Board. You’ll help inform the type of content we create and get access to exclusive meetups, social accreditation, and swag.

Sign up now