Leonardo Devai
df19a2bbb9
Pinned 2026 toolchains (Go 1.26, Rust 1.98/edition 2024, Python 3.14 + uv, Node 24, Zig 0.16, NixOS 26.05), postgres 18 / mongo 8, lockfiles built from, non-root runtimes, .dockerignore, per-project LICENSE, READMEs with the git.devai.io clone line, checkout@v7 CI. Security fixes in the legacy Rust APIs (any-password login, self-assigned admin, hard-coded JWT secret), JWT alg/exp/sub enforcement across the blog series, safe markdown links in the frontends, and many smaller bugs — every project was built, run and exercised end to end. Adds scripts/publish.sh + a CI publish job that splits every folder into its own repo at git.devai.io/templates/<folder>. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01128fhuZbgivaSJvtMf4s1G
56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
# countdown-timer
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A live countdown to any moment you pick — days, hours, minutes and seconds,
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ticking away. It's your first look at doing something on a timer with
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`setInterval`, and at doing arithmetic with dates.
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## Run
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Get it: `git clone https://git.devai.io/templates/countdown-timer.git`
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Double-click `index.html` — it opens in your browser and works. Nothing to
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install, no build step.
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Or serve it like production:
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```sh
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docker compose up --build
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```
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Then open http://localhost:8080.
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## How it works
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`setInterval(tick, 1000)` asks the browser to run `tick()` every second. Each
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tick subtracts two dates — `target - new Date()` gives the milliseconds between
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them — and splits that gap into days (86,400 seconds), hours (3,600), minutes
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and seconds with `Math.floor` and `%` (the remainder).
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`setInterval` returns an id; `clearInterval(id)` stops it. The code clears the
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old timer before starting a new one whenever you pick a date, and stops the
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clock for good when it reaches zero. It counts down to next New Year until you
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choose something else.
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Try it: count down to your birthday with `new Date("2027-05-01")`, add a
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"Reset to New Year" button, or make the seconds pulse by toggling a CSS class
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on each tick.
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## Layout
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```
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index.html the date picker and the four number boxes
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app.js tick(), start(), and the interval they share
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styles.css the look; follows your system's light or dark mode
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```
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## Deploy
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Push to your own GitHub repo and the shipped workflow
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(`.github/workflows/ci.yml`) tests the compose stack, publishes the image to
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GHCR, and — once you set the `DEPLOY_HOST` / `DEPLOY_USER` variables and
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`DEPLOY_KEY` secret — deploys it to your server over ssh.
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---
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Part of [devai.io](https://devai.io) — the Web Basics track: HTML, CSS &
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JavaScript, one concept at a time. Next up:
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[dark-mode-toggle](https://git.devai.io/templates/dark-mode-toggle).
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