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February 28, 2020 23:17
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Dark & light mode switch (with preferred choice kept in localStorage)
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <style> | |
| :root { | |
| --light-color: #fafafa; | |
| --dark-color: #222; | |
| --background-color: var(--light-color); | |
| --text-color: var(--dark-color); | |
| } | |
| html, | |
| body { | |
| padding: 0; | |
| margin: 0; | |
| font-family: Helvetica, Arial, sans-serif; | |
| font-weight: 100; | |
| } | |
| html { | |
| height: 100%; | |
| } | |
| body { | |
| min-height: 100%; | |
| } | |
| input[name='color-scheme'], | |
| input[name='color-scheme']:checked+label { | |
| display: none; | |
| } | |
| #dark-mode:checked~label, | |
| #dark-mode:checked~.page { | |
| --background-color: var(--dark-color); | |
| --text-color: var(--light-color); | |
| } | |
| .page { | |
| display: flex; | |
| align-items: center; | |
| justify-content: center; | |
| min-height: 100vh; | |
| font-size: 3rem; | |
| background-color: var(--background-color); | |
| color: var(--text-color); | |
| } | |
| .color-scheme { | |
| position: absolute; | |
| top: 1rem; | |
| right: 1rem; | |
| width: 4rem; | |
| font-size: 3rem; | |
| line-height: 4rem; | |
| text-align: center; | |
| user-select: none; | |
| color: var(--text-color); | |
| } | |
| </style> | |
| <script> | |
| const colorScheme = localStorage.getItem("color-scheme") || colorScheme; | |
| </script> | |
| </head> | |
| <body> | |
| <input type="radio" id="dark-mode" value="dark-mode" name="color-scheme"> | |
| <label for="dark-mode" class="color-scheme">☾</label> | |
| <!-- checked; default to light mode if JavaScript disabled --> | |
| <input type="radio" id="light-mode" value="light-mode" name="color-scheme" checked> | |
| <label for="light-mode" class="color-scheme">☀︎</label> | |
| <script> | |
| // use preferred color scheme | |
| document.getElementById("light-mode").checked = colorScheme === "light-mode"; | |
| document.getElementById("dark-mode").checked = colorScheme === "dark-mode"; | |
| </script> | |
| <div class="page"> | |
| <p class="content">Hello world!</p> | |
| </div> | |
| <script> | |
| Array.from(document.querySelectorAll("input[name='color-scheme']")) | |
| .forEach(el => el.addEventListener("click", event => { | |
| localStorage.setItem("color-scheme", event.target.id); | |
| })); | |
| </script> | |
| </body> | |
| </html> |
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