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    <p>In environments that only provide a one-way message passing system, you can always implement "message-with-callback" yourself, by associating an unique ID with every message, and storing the callbacks in a dictionary that maps these IDs to the callbacks.</p> <p>At the end of this answer, I've copy-pasted the Safari-specific storage module from the source code of my cross-browser <a href="https://robwu.nl/lyricshere/" rel="nofollow">Lyrics Here extension</a>, which provides the following API:</p> <ul> <li><code>config.getItem(key, callback)</code></li> <li><code>config.setItem(key, value, callback)</code></li> <li><code>config.removeItem(key, callback)</code></li> <li><code>config.clear(callback)</code></li> </ul> <p>The callback of <code>getItem</code> contains the value associated with the key (if found). The other callbacks receive a boolean that tells whether the operation succeeded or not.</p> <p>The source code is annotated and contains snippets to handle a few edge-cases. Feel free to shoot a few questions at me if there's anything unclear.</p> <h3>config-safari.js (<a href="http://en.wikipedia.org/wiki/Asynchronous_module_definition" rel="nofollow">AMD</a>)</h3> <pre><code>// Adapter for maintaining preferences (Safari 5+) // All methods are ASYNCHRONOUS define('config-safari', function() { var config = {}; var callbacks = {}; ['getItem', 'setItem', 'removeItem', 'clear'].forEach(function(methodName) { config[methodName] = function() { var args = [].slice.call(arguments); var callback = args.pop(); var messageID = Math.random(); callbacks[messageID] = callback; var message = { type: methodName, messageID: messageID, args: args }; safari.self.tab.dispatchMessage('config-request', message); }; }); config.init = function() { if (typeof safari === 'undefined') { // Safari bug: safari is undefined when current context is an iframe // and src="javascript:''" // This error is only expected on YouTube. // config.getItem is triggered in main, so we just redefine // it. Don't overwrite setItem, etc., so that errors are thrown // when these methods are used. config.getItem = function(key, callback){ callback(); }; return; } safari.self.addEventListener('message', function(event) { if (event.name === 'config-reply') { var messageID = event.message.messageID; var callback = callbacks[messageID]; // Check if callback exists. It may not exist when the script is // activated in multiple frames, because every frame receives the message if (callback) { delete callbacks[messageID]; callback(event.message.result); } } }, true); }; return config; }); </code></pre> <p>Fragment of global.html:</p> <pre><code>&lt;script&gt; (function(exports) { var config = {}; config.getItem = function(key, callback) { var result = safari.extension.settings.getItem(key); if (typeof result === 'string') { try { result = JSON.parse(result); } catch (e) { // Extremely unlikely to happen, but don't neglect the possibility console.log('config.getItem error: ' + e); result = undefined; } } callback(result); }; // callback's argument: true on success, false otherwise config.setItem = function(key, value, callback) { var success = false; try { value = JSON.stringify(value); // Safari (5.1.5) does not enforce the database quota, // let's enforce it manually (ok, set the quota per key, since // the performance issue only occur when a specific key has an outrageous high value) // 1 MB should be sufficient. if (value.length &gt; 1e6) { throw new Error('QUOTA_EXCEEDED_ERR: length=' + value.length); } safari.extension.settings.setItem(key, value); success = true; } catch (e) { console.log('config.setItem error: ' + e); } callback(success); }; // callback's argument: true on success, false otherwise config.removeItem = function(key, callback) { safari.extension.settings.removeItem(key); callback(true); }; // callback's argument: true on success, false otherwise config.clear = function(callback) { safari.extension.settings.clear(); callback(true); }; // config's message handler function handleConfigRequest(event) { var args = event.message.args; // Last argument: Always a callback args.push(function(result) { // Note: All of the config methods send a callback only once // Behavior for calling the callback twice is undefined. // Send a reply to trigger the callback at the sender's end event.target.page.dispatchMessage('config-reply', { messageID: event.message.messageID, result: result }); }); config[event.message.type].apply(config, args); } // Export exports.handleConfigRequest = handleConfigRequest; })(window); &lt;/script&gt; &lt;script&gt; safari.application.addEventListener('message', function(event) { switch (event.name) { case 'config-request': handleConfigRequest(event); break; /* ... other things removed ... */ } }, true); &lt;/script&gt; </code></pre>
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    1. POIs there a simple conversion method for converting chrome message passing to the safari message passing syntax?
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    1. COthank you! thats great! :) i came up with a similar solution. still working through it, I've somehow managed to create an endless message passing loop, doh! oh well im sure i will figure it out eventually. though i think i should probably try your tried and trusted method, rather than my own.
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    2. CO*UPDATE* aha, i managed to break out of the endless loop, yay. thanks again.
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