32 lines
1.0 KiB
JavaScript
32 lines
1.0 KiB
JavaScript
'use strict';
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// https://chromeextensionsdocs.appspot.com/apps/content_scripts#host-page-communication
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// - 'content_script' and execution env are isolated from each other
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// - In order to communicate we use the DOM (window.postMessage)
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//
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// app.js | |content-script.js | |background.js
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// window.postMessage|------->|port.postMessage |----->| port.onMessage
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// | window | | port |
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// webkitGetUserMedia|<------ |window.postMessage|<-----| port.postMessage
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//
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var port = chrome.runtime.connect(chrome.runtime.id);
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port.onMessage.addListener(function(msg) {
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window.postMessage(msg, '*');
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});
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window.addEventListener('message', function(event) {
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// We only accept messages from ourselves
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if (event.source !== window) {
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return;
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}
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if (event.data.type && ((event.data.type === 'SS_UI_REQUEST') ||
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(event.data.type === 'SS_UI_CANCEL'))) {
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port.postMessage(event.data);
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}
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}, false);
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window.postMessage({ type: 'SS_PING', text: 'start' }, '*');
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