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Editorial Team
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Asked: 2026-05-27T21:11:45+00:00

While creating a Google Chrome extension, I have code that must remain in a

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While creating a Google Chrome extension, I have code that must remain in a separate javascript file:

separate.js
-----------
var x = "some dynamic value";
var y = "another dynamic value";
return x;

I would like to get the value of x from this code into a code included in my background page:

background.html
-----------
<!DOCTYPE html>
<html>
  <head><script src="code.js"></script></head>
</html>

_ 

code.js
-----------
chrome.tabs.executeScript(null, {file:"separate.js"}, function() {});

How do I go about retrieving a variable set in separate.js (say, y)? Is there a way to use executeScript() to get the return value of a script?

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1 Answer

  1. Editorial Team

    At your code.js (injected by your extension), make use of chrome.extension.sendRequest:

    var y = "variable to send";
function f_callback(response) {
    alert(response);
}
chrome.extension.sendRequest({y: y}, f_callback); //<-- Trigger

    At separate.js (at background.html), use chrome.extension.onRequest:

    function listener(o_request, o_sender, f_callback) {
    // This function is triggered by the function, see above
    alert(o_request.y); //<---y
    f_callback("Done something"); //<-- Calls callback. Can only be done once!
}
chrome.extension.onRequest.addListener(listener);
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