Chrome extension: Communication between content script and background.html

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sendRequest/onRequest is replaced with sendMessage/onMessage in Chrome 20. *Message is not just an alias for *Request, it’s a different API.

If you want to support Chrome <20 (many Ubuntu users are still at Chromium 18, because the PPA is not updated), use onRequest and sendRequest. Otherwise, use the *Message methods.

Another problem is that your function is located in the background page, and the call is made in the pop-up. These are different scopes, if you want to call a background page method from the popup, use chrome.extension.getBackgroundPage():

chrome.extension.getBackgroundPage().testRequest();

Final note: You’re using manifest version 1 and inline event handlers. This practice is deprecated, for more information, see http://code.google.com/chrome/extensions/manifestVersion.html.

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