Astro PicoCss V2 DarkMode Switcher

readme.md

Astro component for PicoCss V2 DarkMode Switcher

Astro: https://docs.astro.build/ Pico V2: https://v2.picocss.com/

Inspired by: https://github.com/RWDevelopment/theme_switch

Pico V2 must be used in your CSS.

Usage:

---
import ThemeSwitcher from "./ThemeSwitcher.astro";
---

...
  
<li>
  <ThemeSwitcher />
</li>

ThemeSwitcher.astro

---
---

<button id="theme-switcher"></button>

<style is:global>
  #theme-switcher {
    background: none;
    border: 0;
  }
  #theme-switcher svg {
    width: 1rem;
    height: 1rem;
    color: var(--pico-contrast);
  }
</style>

<script>
  let isLight = true;
  const html = document.documentElement;
  const switchTheme = document.getElementById("theme-switcher");
  const os_default =
    '<svg viewBox="0 0 16 16"><path fill="currentColor" d="M8 15A7 7 0 1 0 8 1v14zm0 1A8 8 0 1 1 8 0a8 8 0 0 1 0 16z"/></svg>';
  const sun =
    '<svg viewBox="0 0 16 16"><path fill="currentColor" d="M8 11a3 3 0 1 1 0-6a3 3 0 0 1 0 6zm0 1a4 4 0 1 0 0-8a4 4 0 0 0 0 8zM8 0a.5.5 0 0 1 .5.5v2a.5.5 0 0 1-1 0v-2A.5.5 0 0 1 8 0zm0 13a.5.5 0 0 1 .5.5v2a.5.5 0 0 1-1 0v-2A.5.5 0 0 1 8 13zm8-5a.5.5 0 0 1-.5.5h-2a.5.5 0 0 1 0-1h2a.5.5 0 0 1 .5.5zM3 8a.5.5 0 0 1-.5.5h-2a.5.5 0 0 1 0-1h2A.5.5 0 0 1 3 8zm10.657-5.657a.5.5 0 0 1 0 .707l-1.414 1.415a.5.5 0 1 1-.707-.708l1.414-1.414a.5.5 0 0 1 .707 0zm-9.193 9.193a.5.5 0 0 1 0 .707L3.05 13.657a.5.5 0 0 1-.707-.707l1.414-1.414a.5.5 0 0 1 .707 0zm9.193 2.121a.5.5 0 0 1-.707 0l-1.414-1.414a.5.5 0 0 1 .707-.707l1.414 1.414a.5.5 0 0 1 0 .707zM4.464 4.465a.5.5 0 0 1-.707 0L2.343 3.05a.5.5 0 1 1 .707-.707l1.414 1.414a.5.5 0 0 1 0 .708z"/></svg>';
  const moon =
    '<svg viewBox="0 0 16 16"><g fill="currentColor"><path d="M6 .278a.768.768 0 0 1 .08.858a7.208 7.208 0 0 0-.878 3.46c0 4.021 3.278 7.277 7.318 7.277c.527 0 1.04-.055 1.533-.16a.787.787 0 0 1 .81.316a.733.733 0 0 1-.031.893A8.349 8.349 0 0 1 8.344 16C3.734 16 0 12.286 0 7.71C0 4.266 2.114 1.312 5.124.06A.752.752 0 0 1 6 .278zM4.858 1.311A7.269 7.269 0 0 0 1.025 7.71c0 4.02 3.279 7.276 7.319 7.276a7.316 7.316 0 0 0 5.205-2.162c-.337.042-.68.063-1.029.063c-4.61 0-8.343-3.714-8.343-8.29c0-1.167.242-2.278.681-3.286z"/><path d="M10.794 3.148a.217.217 0 0 1 .412 0l.387 1.162c.173.518.579.924 1.097 1.097l1.162.387a.217.217 0 0 1 0 .412l-1.162.387a1.734 1.734 0 0 0-1.097 1.097l-.387 1.162a.217.217 0 0 1-.412 0l-.387-1.162A1.734 1.734 0 0 0 9.31 6.593l-1.162-.387a.217.217 0 0 1 0-.412l1.162-.387a1.734 1.734 0 0 0 1.097-1.097l.387-1.162zM13.863.099a.145.145 0 0 1 .274 0l.258.774c.115.346.386.617.732.732l.774.258a.145.145 0 0 1 0 .274l-.774.258a1.156 1.156 0 0 0-.732.732l-.258.774a.145.145 0 0 1-.274 0l-.258-.774a1.156 1.156 0 0 0-.732-.732l-.774-.258a.145.145 0 0 1 0-.274l.774-.258c.346-.115.617-.386.732-.732L13.863.1z"/></g></svg>';

  document.addEventListener("DOMContentLoaded", () => {
    switchTheme.innerHTML = os_default;
    html.setAttribute("data-theme", "auto");
    switchTheme.setAttribute("data-tooltip", "os theme");
    switchTheme.focus();
    removeTooltip(3000);
  });
  switchTheme.addEventListener("click", (e) => {
    e.preventDefault();
    isLight = !isLight;
    html.setAttribute("data-theme", isLight ? "light" : "dark");
    switchTheme.innerHTML = isLight ? sun : moon;
    switchTheme.setAttribute(
      "data-tooltip",
      `${isLight ? "light" : "dark"} theme`
    );
    removeTooltip();
  });
  const removeTooltip = (timeInt = 1750) => {
    setTimeout(() => {
      switchTheme.blur();
    }, timeInt);
  };
</script>