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Message passing in Chrome extensions
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| chrome.extension.onMessage.addListener( | |
| /* | |
| request = payload | |
| sender = information about the payload | |
| sendResponse = function to send response to. Explanation above (1). | |
| */ | |
| function(request, sender, sendResponse){ | |
| var tabId = sender.tab.id, // Which tab is the query from? | |
| isValid; | |
| /* | |
| Check the request is valid here | |
| */ | |
| if (!isValid) { | |
| sendMessage(tabId, 'Error'); // Send an error to the right tab | |
| return; // Stop execution | |
| } | |
| getXHR('[atlasUrl]' + request, function(error, results){ | |
| if (error) { | |
| sendMessage(tabId, 'Error'); | |
| } else { | |
| sendMessage(tabId, results); | |
| } | |
| }); | |
| } | |
| ); | |
| function sendMessage(tab, data) { | |
| if (tab && data) { | |
| chrome.tabs.sendMessage(tab, data); | |
| } | |
| } |
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| chrome.extension.onMessage.addListener(function(results) { // Listen for results | |
| // Append results to the DOM | |
| }); | |
| function sendMessage(data) { | |
| if (data) { | |
| chrome.extension.sendMessage(data, false); // false here can be replaced with | |
| } // a function. Explanation below (1). | |
| } |
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