Question

146

Java, nashorn accessing another js file

rated 0 times [ 148] [ 2] / answers: 1 / hits: 16372 / 9 Years ago, sat, march 14, 2015, 12:00:00

Is it possible to include one js from another with java nashorn engine?

ScriptEngine engine = new ScriptEngineManager().getEngineByName(Nashorn);

InputStreamReader rs = new InputStreamReader(new FileInputStream(new File(.../script.js));

engine.eval(rs);

script.js

var System = Java.type('java.lang.System');

// document.write(./test.js); - javax.script.ScriptException: ReferenceError: document is not defined 

// require('./test.js'); - require is not defined

test.js

System.out.println(reading test.js file);

i want to create top level script (in this example its script.js) and use it as a library for other scripts in same directory.

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gregorio

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3 Years ago

answered 9 Years ago jaden · Accepted Answer

you can use Nashorn's load() function

https://wiki.openjdk.java.net/display/Nashorn/Nashorn+extensions

// can load script from files, URLs



load(foo.js); // loads script from file foo.js from current directory

load(http://www.example.com/t.js); // loads script file from given URL



// loads script from an object's properties. 



// Object should have script and name properties.

//     script property contains string code of the script. 

//     name property specifies name to be used while reporting errors from script

// This is almost like the standard eval except that it associates a name with

// the script string for debugging purpose.



load({ script: print('hello'), name: myscript.js})



// load can also load from pseudo URLs like nashorn:, fx:. nashorn: pseudo URL scheme

// for nashorn's built-in scripts. fx: pseudo URL scheme for JavaFX support scripts



// load nashorn's parser support script - defines 'parse'

// function in global scope



load(nashorn:parser.js); 



// load Mozilla compatibility script - which defines global functions

// like importPackage, importClass for rhino compatibility.



load(nashorn:mozilla_compat.js);