Attempting to execute Javascript code from within Java programming environment

One of my JavaScript code snippets utilizes another external JavaScript source:

<body>
  <script src="node_modules/node-vibrant/dist/vibrant.js"></script>

  <script type="text/javascript">
    function test(src) {
      Vibrant.from(src).getPalette(function(err, swatches) {
        if (err) throw err;
        for (var key in swatches) {
          if (key === "Vibrant") {
            var swatch = swatches[key];
            if (swatch) {
              console.log("hex: " + swatch.getHex());
              return (swatch.getHex());
            }
          }
        }
      });
    }

    test("Apples.jpg");
  </script>
</body>

I am looking to call this JavaScript code from within Java. What would be the best approach to achieve this?

I attempted to use the ScriptManager, but encountered an error message stating:

window is not defined

Answer №1

Here is a solution that should suit your needs.

 ScriptEngineManager manager = new ScriptEngineManager();
            ScriptEngine engine = manager.getEngineByName("JavaScript");

            // JavaScript code in a String
            String script = " function findColorPalette(src) {   Vibrant.from(src).getPalette(function(err, swatches) {        if (err) throw err;          for (var key in swatches) {    if(key==='Vibrant'){          var swatch = swatches[key];          if (swatch) {        console.log('hex: ' + swatch.getHex());            return(swatch.getHex());              }}        }      });    }";
            // evaluate script
            engine.eval(script);


            Invocable inv = (Invocable) engine;

            // invoke the global function named "findColorPalette"
            inv.invokeFunction("findColorPalette", "Apples.jpg" );

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