Created
September 30, 2021 09:11
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Medium post about communication between app and service workers (https://medium.com/p/3c719f6f646e/edit)
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>SW Messages</title> | |
| <link rel="manifest" href="./pwa.webmanifest"> | |
| <script> | |
| const queue = {}; | |
| const generateMsgId = () => `${(new Date()).getTime()}`; | |
| navigator.serviceWorker.register('sw.js'); | |
| navigator.serviceWorker.addEventListener('message', (event) => { | |
| const msg = event.data; | |
| if (typeof queue[msg.id] === 'function') | |
| queue[msg.id](msg.payload); | |
| }); | |
| function sendMsgToSw(payload) { | |
| const id = generateMsgId(); | |
| return new Promise((resolve) => { | |
| queue[id] = resolve; | |
| const msg = {id, payload}; | |
| self.navigator.serviceWorker | |
| .ready | |
| .then((reg) => reg.active.postMessage(msg)); | |
| }); | |
| } | |
| sendMsgToSw('message from app') | |
| .then((res) => console.log(JSON.stringify(res))); | |
| </script> | |
| </head> | |
| <body></body> | |
| </html> |
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| { | |
| "background_color": "#D9D9FF", | |
| "description": "SW Messages", | |
| "display": "standalone", | |
| "icons": [ | |
| { | |
| "src": "./img/favicon-192.png", | |
| "sizes": "192x192", | |
| "type": "image/png" | |
| }, { | |
| "src": "./img/favicon-512.png", | |
| "sizes": "512x512", | |
| "type": "image/png" | |
| } | |
| ], | |
| "name": "SW Messages", | |
| "scope": "./", | |
| "short_name": "SW Messages", | |
| "start_url": "./", | |
| "theme_color": "#D9D9FF" | |
| } |
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| /** | |
| * @param {MessageEvent} event | |
| */ | |
| function onMessage(event) { | |
| const msg = event.data; | |
| const id = msg.id; | |
| const res = `answer from SW to msg #${id}.`; | |
| event.source.postMessage({id, payload: res}); | |
| } | |
| self.addEventListener('message', onMessage); |
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