Calling JavaScript function in a .js file from Java

Question

What is the best way to call a JavaScript function in a different .js file from a Java file?

Say, I have a String like so in a Java file:

String test = "[name1, name2, name2]";

What I am trying to do is the following:

Convert the Java String into a JavaScript array
Pass the JavaScript array to a JavaScript function in a different .js file.

Thanks, Sony

JS runs on the client side, Java runs on the server's side. The server-side does not "pass" parameters to the client-side, the server-side generates the client-side. So I don't understand the issue. Can you tell us more about what you're trying to do ? — Nir Alfasi
– Nir Alfasi, Commented Mar 4, 2012 at 0:17
@alfasin Java runs on the server's side Java also could be a java applet java.sun.com/products/plugin/1.3/docs/jsobject.html — Cheery
– Cheery, Commented Mar 4, 2012 at 2:42
@Cheery you're right. But I have a feeling that Sony didn't refer to applets. — Nir Alfasi
– Nir Alfasi, Commented Mar 4, 2012 at 4:25

Wesley · Accepted Answer · 2012-03-04 00:22:35Z

6

If you want to use JavaScript in a Java application, you can use Rhino.

If you want to call client side JavaScript form a serverside Java web application, you can use DWR's Reverse Ajax.

Good luck!

answered Mar 4, 2012 at 0:22

Wesley

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Demetrio Neto · Accepted Answer · 2012-03-04 02:17:47Z

If you want to integrate Javascript and Java, then you can use Rhino. See the example below for a better comprehension:

test.js

function test(array){
    for(var i in array){
        out.println(array[i]);
    }
}

RhinoTest.java

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.Scriptable;

public class RhinoTest {

    public static void main(String[] args) {

        Context ctx = new ContextFactory().enterContext();

        Scriptable scope = ctx.initStandardObjects();

        try {
            Object out = Context.javaToJS(System.out, scope);
            scope.put("out", scope, out);

            FileReader fr = new FileReader("test.js");
            ctx.evaluateReader(scope, fr, "<cmd>", 1, null);
            fr.close();

            String[] strArray = {"name1","name2","name3"};
            Object jsArray = Context.javaToJS(strArray, scope);
            scope.put("jsArray", scope, jsArray);

            ctx.evaluateString(scope, "test(jsArray)", "<cmd>", 1, null);

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Context.exit();
    }
}

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