CODEWITHSUNDEEP
javajavascriptactivexinternet-explorer-10
Shree
Shree

Reputation: 1061

How to get installed JRE/Java version in IE10 using javascript

I want to run applets in IE10 which requires a least version of java 1.7.0_51.

So before loading applet, I want to check the current installed jre version and display a proper message if the current jre is not suitable.

So to do this we are using deployJava.js (https://www.java.com/js/deployJava.txt).

In this we are calling getJREs function to get the all available jres. But its returning an empty list.

After debugging we found in testUsingActiveX function its not able to create ActiveXObject for version 1.7.0, though the version is installed. Its throwing exception and returning false.

Is there any work around or a better way to solve this issue.

Upvotes: 1

Views: 550

Answers (1)

Marko Gresak
Marko Gresak

Reputation: 8217

Use navigator.plugins. I believe it's supported by every major browser, even with older versions. I've tested it with latest versions of Chrome, Firefox, Safari and IE.

Here's a function which returns Java Deployment Toolkit version:

function getJavaVersion() {

    // note the extra space, it's used to make split easier
    var jdtString = 'Java Deployment Toolkit ';
    var jdtIndex = -1;
    // find index of JDT inside navigator.plugins
    for (var i = 0; i < navigator.plugins.length; i++)
        if (navigator.plugins[i].name.indexOf(jdtString) >= 0)
            jdtIndex = i;

    if (jdtIndex === -1)
        return null; // Java Deployment Toolkit was not found

    return navigator.plugins[jdtIndex].name.split(jdtString)[1];
}

This returns Java version number, for example 8.0.50.13, or null if JDT was not found. Using this number, you can parse out specific version number and compare it to required version.

Upvotes: 1

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