Using Tesseract.js to OCR every image on a page
Pasting this code into a DevTools console should load Tesseract.js from a CDN, loop through every image loaded by that page (every PNG, GIF, JPG or JPEG), run OCR on them and output the result to the…
javascript
37 posts tagged “javascript”.
- 2024
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1 min read
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Calculating the AQI based on the Purple Air API for a sensor
Purple Air sensors have an API at , which returns JSON that looks something like this: There's just one problem with this: it doesn't give you the AQI number that is displayed on their site!
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Loading lit from Skypack
Lit 2 stable was released today, offering a tiny, feature-full framework for constructing web components using modern JavaScript.
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Converting HTML and rich-text to Markdown
If you copy and paste from a web page - including a full table - into a GitHub issue comment GitHub converts it to the corresponding Markdown for you. Really quick way to construct Markdown tables.
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JavaScript date objects
A few notes on JavaScript object, based on trying to do some basic things with them in Observable notebooks.
1 min read - 2023
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Display EC2 instance costs per month
The EC2 pricing page shows cost per hour, which is pretty much useless. I want cost per month. The following JavaScript, pasted into the browser developer console, modifies the page to show…
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Scroll page to form if there are errors
For a Django application I'm working on (this issue) I have a form that can be quite a long way down the page.
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HTML datalist
A Datasette feature suggestion concerning autocomplete against a list of known values inspired me to learn how to use the HTML element (see MDN).
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Annotated code for a demo of WebSocket chat in Deno Deploy
Deno Deploy is a hosted Deno service that promises a multi-tenant JavaScript engine running in 25 data centers across the world.
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GitHub OAuth for a static site using Cloudflare Workers
My tools.simonwillison.net site is a growing collection of small HTML and JavaScript applications hosted as static files on GitHub Pages.
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Histogram with tooltips in Observable Plot
Given an array of datetime objects, I wanted to plot a histogram. But I wanted to automatically pick a bucket size for that histogram that resulted in something interesting, no matter what range of…
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Deno KV
Initial article: April 28th 2023 - see below for an update I got intrigued by Deno KV, which describes itself as "a global database for global apps".
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Using packages from JSR with esbuild
JSR is a brand new package repository for "modern JavaScript and TypeScript", launched on March 1st by the Deno team as a new alternative to npm My JavaScript ecosystem fluency isn't great, so it took…
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Downloading every video for a TikTok account
TikTok may or may not be banned in the USA within the next 24 hours or so. Here's a pattern you can use to download all of the videos from a specific account.
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Annotated package.json for idb-keyval
Jake Archibald pointed to his for as a "modernish example" of NPM packaging on Twitter this morning. I've been frustrated at my lack of understanding of for too long, so I decided to do some research…
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Preventing double form submissions with JavaScript
I needed this for VIAL issue 722. I decided to disable form submissions for two seconds after they are submitted, to protect against accidental double submissions without risk of unexpected issues…
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Configuring auto-update for an Electron app
This is almost really simple. I used electron/update-electron-app for it, the instructions for which are: - Add it to with - Make sure your field in that file points to your GitHub repository - Use…
1 min read