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Editorial Team
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Asked: 2026-05-26T14:56:06+00:00

I want to make a chrome extension that will connect to a localhost server

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I want to make a chrome extension that will connect to a localhost server to receive instructions to play songs in Grooveshark using the Grooveshark Javascript API.
(http://grooveshark.com/GroovesharkAPI.html)

For example, if I type window.Grooveshark.addSongsByID([13963],true) in the javascript console, it’ll add the song and start playing like it should I need to be able to do this from the extension. So to start, I just wanted to make an extension with a background page and just this single script to execute the command:

background.html

<!doctype html>
<html>
    <head>
        <script src="background.js"></script>
    </head>
    <body>
    </body>
</html>

background.js

chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.executeScript(
    null, {code:"window.Grooveshark.addSongsByID([13963],true)"});
});

manifest.json

{
  "name": "Play song in Grooveshark",
  "version": "0.1.0",
  "background_page": "background.html",
  "permissions": [
    "tabs", "http://*/*"
  ],
  "browser_action": {
    "name": "Play song",
    "default_icon": "icon.png"
  }
}

Could anyone tell me why it doesn’t work?

Thank you very much!!

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1 Answer

  1. Editorial Team

    Content scripts cannot access parent page’s window object. You would need to inject <script> tag into a page with your code.

    //bg page
chrome.tabs.executeScript(null, {
    code: "injectJs('window.Grooveshark.addSongsByID([13963],true)')"
});

//content script
function injectJs(code) {
        var scr = document.createElement("script");
        scr.type = "text/javascript";
        scr.text = code;
        (document.head || document.body || document.documentElement).appendChild(scr);
}

    You can inject injectJs function through manifest to all pages, and then call it when needed.

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