"Comparison: Java Installation vs. Enabling Java in Your Web Browser

Is there a method to determine if Java is currently running on your system or if it has been disabled in your browser? Our application relies on Java applets, and we typically use "deployJava.js" to load the applet. However, even when Java is disabled in the browser settings, the script still indicates that Java is not installed.

Are there any ways to distinguish between a scenario where Java is simply not installed versus a situation where it has been intentionally disabled? Ideally, I am looking for a solution using JavaScript. I have also explored using "navigator.javaEnabled()" as an alternative, but this function yields the same result as using "deployJava.js".

javajavascriptappletdeployjava

Answer №1

It is not possible to detect if a plugin is installed.

If it was possible, it would raise privacy concerns. There is already enough information being shared between browsers and websites, adding plugin detection would only make things more invasive.

While it might be useful to have an API for this in the future, currently there isn't one available. Plugins are either enabled or disabled, regardless of whether they are installed or not.

A workaround would be to communicate to users that Java needs to be installed or enabled for certain features to work properly. Alternatively, you could provide a diagnostic tool for users to download and run locally to check for the plugin, though this may add extra steps and complexity for users.

Answer №2

  1. Implement a creative redirect in the HTML page of interest. Redirect to a page named 
    javaNotEnabledOrNotInstalled.html
    , but come up with a quirky and less obvious title for it.
  2. At the beginning of the applet's init() function, utilize JavaScript to prevent the redirect from occurring.

It is important to note that within the traditional applet element..

<applet 
  code=.. 
  width=.. 
  height=.. 
  alt='Java is installed but disabled!'>
No Java Plug-In installed in this browser.  Get Java free from..
</applet>

In the event where Java is completely not installed, the user will encounter..

No Java Plug-In installed in this browser. Get Java free from..

However, if Java is actually installed but disabled, they should be shown..

Java is installed but disabled!

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