How to pass an object from Java to JavaScript using Rhino

Question

I am working on a Java program where an object needs to have user-customization behavior for one function. I am implementing this using Mozilla Rhino, JavaScript and Java.

I cannot figure out how to take the already instantiated object and pass it to a pre-written script.

I have looked through many tutorials on Rhino, and none have given an example like this. Any advice or links would be greatly appreciated.

Thank you for your time.

Community · Accepted Answer · 2017-05-23 11:56:29Z

0

This answer to another question passes an object, data, from Java to Rhino Javascript.

I have no idea whether or not it works (well I suppose it does). Here are the relevant parts:

public static class data { 
   Double value = 1.0d;
}

ScriptEngine engine = new ScriptEngineManager().getEngineByName ("rhino"); 
data data = new data();
Context.enter().getWrapFactory().setJavaPrimitiveWrap(false);

engine.eval("function test(data) { return data.get('value1') + 5;};"); 
System.out.println("Result:" + ((Invocable)engine).invokeFunction("test", data));

(I didn't know about that setJavaPrimitiveWrap(), here is some WrapFactory Javadoc.)

edited May 23, 2017 at 11:56

CommunityBot

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answered May 29, 2012 at 7:16

KajMagnus

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