This method indicates whether the current browser is Java-enabled or not.
result = window.navigator.javaEnabled()
if (window.navigator.javaEnabled()) { // browser has java }
The return value for this method indicates whether the preference that controls Java is on or off - not whether the browser offers Java support in general.
This not part of any specifications.
© 2005–2017 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/navigatorPlugins/javaEnabled