Detect version of Java using JavaScript

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According to the fact that we’re finding this page with google, just to help the next guys finding this.

Is Java installed?

navigator.javaEnabled()

http://www.w3schools.com/jsref/met_nav_javaenabled.asp

Which version of Java is installed?

<script src="http://www.java.com/js/deployJava.js"></script>
<script>
var versions = deployJava.getJREs();
</script>

http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html#deplToolkit

It’s the best way I found to find the version of Java with JavaScript, but use it carefully because its version detection is really os/browser dependent, and on old browser version or on recent browser with old Java installed, it’ll not work as expected. Take the time to do real tests before to use it in production.

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