Can anyone offer a straightforward method for obtaining JavaScript output in Java within the Eclipse environment?

Currently, I am attempting to retrieve the return value from a JavaScript function that I have created. Although I can achieve this using a complex method involving listeners, I am interested in utilizing Eclipse's Browser.evaluate method.

For practice purposes, I have included the following code in a Java file:

Object result = this.browser.evaluate("new String(\"Hello World\")");

where this.browser is instantiated in a class that extends org.eclipse.ui.part.EditorPart within the overridden function createPartControl:

public void createPartControl(Composite parent) {
  // Create the browser instance and set it up
  this.browser = new Browser(parent, SWT.NONE);
  this.browser.addFocusListener(new FocusAdapter() {
    @Override
    public void focusGained(FocusEvent e) {
      SomeEditor.this.getSite().getPage().activate(SomeEditor.this);
    }
  });
  new ErrorReporter(this.browser);
  this.browser.setUrl(Activator.getResourceURL("html/java-shim.html").toString());
  ...additional details omitted...
}

However, instead of result containing the string "Hello World", it appears to be null. Is there a mistake in my implementation of this method, or is it possibly malfunctioning?

Answer №1

In order to get a response in JavaScript, you must:

Object output = browser.evaluate("return 'Hello World'");

This method is effective for my needs.

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