Distinguish if JAVA is disabled or not installed using Javascript

Question

How can I distinguish between the following scenarios using a Javascript test in browser?

Java is installed but disabled
Java is not installed at all

I have checked deployJava.js and navigator.javaEnabled() but they seem to return false in both scenarios if I disable JAVA using JAVA control panel in Windows.

deployJava.versionCheck("1.5+") //false

navigator.javaEnabled() //false

Thanks for your help.

P.S. I checked similar answers but they all are related to detecting to some other version of JAVA. I just need to know which of the above mentioned state occurs.

Question is not about detecting the version of java. I know how to do that. My question is how do i tell if java is disabled by user or its not installed at all. — Varinder Singh
– Varinder Singh, Commented Apr 10, 2013 at 9:18
My apologies, I judged too fast. Have you checked getJREs();? — Tim S.
– Tim S., Commented Apr 10, 2013 at 9:20
@TimS. No prob.Yeah i checked that but it returns [] empty object if disabled — Varinder Singh
– Varinder Singh, Commented Apr 10, 2013 at 9:23

Anya Shenanigans · Accepted Answer · 2013-04-10 21:52:03Z

1

From the browser, there's no way to differentiate between the two cases you mention. When you disable java using the control panel, then it doesn't get loaded into the browser, and so the browser cannot tell you if it's installed or not.

You would have a similar issue with other plugins if they had an on-off switch of that form.

answered Apr 10, 2013 at 21:52

Anya Shenanigans

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2 Comments

Varinder Singh Over a year ago

Is it possible using an applet?

Anya Shenanigans Over a year ago

The applet would never be loaded in either case (disabled, not installed) so you still could not tell

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