Created
March 25, 2011 14:05
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Chrome Extension compatibility for Greasemonkey's GM_getValue and GM_setValue
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| <html> | |
| <script> | |
| chrome.extension.onRequest.addListener(function(request, sender, sendResponse) | |
| { | |
| if (request.type == "getprefs") | |
| { | |
| var response = {}; | |
| for (var i = 0, l = localStorage.length; i < l; i++) | |
| { | |
| var key = localStorage.key(i); | |
| response[key] = localStorage.getItem(key); | |
| } | |
| sendResponse(response); | |
| } | |
| else if (request.type == "setpref") | |
| { | |
| localStorage.setItem(request.name, request.value); | |
| } | |
| }); | |
| </script> | |
| </html> |
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| // Request settings from the extension's localStorage and kick things off | |
| chrome.extension.sendRequest({type: "getprefs"}, function(response) | |
| { | |
| cachedSettings = response; | |
| init(); | |
| }); |
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| { | |
| ... | |
| "background_page": "background.html", | |
| "content_scripts": [ | |
| { | |
| "js": ["UserScript.js", "ChromeContentScript.js"], | |
| "run_at": "document_end" | |
| } | |
| ], | |
| ... | |
| } |
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| var isGM = !(typeof GM_getValue === "undefined" || GM_getValue("a", "b") === undefined); | |
| /** | |
| * If we're running on a content page, this variable will point at an object | |
| * containing settings retrieved from the extension's localStorage, otherwise | |
| * we're running in the extension's context and want to access localStorage | |
| * directly. | |
| * | |
| * This allows us to include this script for use as a library in extension | |
| * contexts, such as in a prefs page. | |
| */ | |
| var cachedSettings = null; | |
| if (!isGM) | |
| { | |
| GM_getValue = function(name, defaultValue) | |
| { | |
| var value = (cachedSettings === null ? | |
| localStorage.getItem(name) : | |
| cachedSettings[name]); | |
| if (value === undefined) | |
| { | |
| return defaultValue; | |
| } | |
| var type = value[0], | |
| value.substring(1); | |
| switch (type) | |
| { | |
| case "b": | |
| return (value === "true"); | |
| case "n": | |
| return Number(value); | |
| default: | |
| return value; | |
| } | |
| } | |
| GM_setValue = function(name, value) | |
| { | |
| value = (typeof value)[0] + value; | |
| if (cachedSettings === null) | |
| { | |
| localStorage.setItem(name, value); | |
| } | |
| else | |
| { | |
| cachedSettings[name] = value; | |
| chrome.extension.sendRequest({type: "setpref", name: name, value: value}); | |
| } | |
| } | |
| } | |
| function init() | |
| { | |
| // Do your thing | |
| } | |
| // Chrome will use another content script to initialise the script. | |
| if (isGM) | |
| { | |
| init(); | |
| } |
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