Created
September 25, 2022 01:30
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Background Color Sync with BroadcastChannel API
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <title>Background Color Sync with BroadcastChannel API</title> | |
| </head> | |
| <body> | |
| <input type="color" id="bgColorPicker" /> | |
| <script> | |
| (() => { | |
| const bc = new BroadcastChannel("bytefer_channel"); | |
| const bodyElement = document.querySelector("body"); | |
| const bgColorPicker = document.querySelector("#bgColorPicker"); | |
| const COLOR_KEY = "bgColor"; | |
| const setBackgroundColor = (color) => { | |
| bodyElement.style.backgroundColor = color; | |
| }; | |
| bc.onmessage = (messageEvent) => { | |
| if (messageEvent.data === "updateBgColor") { | |
| const bgColor = localStorage.getItem(COLOR_KEY); | |
| bgColorPicker.value = bgColor; | |
| setBackgroundColor(bgColor); | |
| } | |
| }; | |
| if (localStorage.getItem(COLOR_KEY)) { | |
| setBackgroundColor(localStorage.getItem(COLOR_KEY)); | |
| } else { | |
| alert("Please choose a background color."); | |
| } | |
| bgColorPicker.onchange = (e) => { | |
| const bgColor = e.target.value; | |
| localStorage.setItem(COLOR_KEY, bgColor); | |
| setBackgroundColor(bgColor); | |
| bc.postMessage("updateBgColor"); | |
| }; | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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