Javascript: Can you read the systems volume?

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I’m assuming you’re talking about Javascript in a browser environment. In this case, the answer is clear, short and simple: No.

Clientside Javascript has no support for File IO operations.

However, in some browsers you can breach that rule by setting browser specific options. For instance, calling a Webkit based browser with the command-line argument –disable-web-security allows the browser to read a uri like file:///c/somefolder/. Mozilla offers this possibilty by editing the user ini plus a setting in about:config.

Update

I guess deceze’s comment is correct and you really mean the “sound volume”. In that case you can forget about the above text, but the answer is again no. There is no native Javascript interface to get and/or set that kind of OS setting.

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