JavaFX sample to get selected text from a HTMLEditor

SelectionExtractor.java

import javafx.application.Application;
import javafx.geometry.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.scene.web.*;
import javafx.stage.Stage;

public class SelectionExtractor extends Application {

    public static final String HTML =
            "<p><em>\"Do not judge me by my successes, judge me by how many times I fell down and got back up again.\"</em></p>" +
            "&nbsp;&nbsp&nbsp&nbsp;-&nbspNelson Rolihlahla Mandela";

    public static final String SELECT_TEXT =
            "(function getSelectionText() {\n" +
            "    var text = \"\";\n" +
            "    if (window.getSelection) {\n" +
            "        text = window.getSelection().toString();\n" +
            "    } else if (document.selection && document.selection.type != \"Control\") {\n" +
            "        text = document.selection.createRange().text;\n" +
            "    }\n" +
            "    if (window.getSelection) {\n" +
            "      if (window.getSelection().empty) {  // Chrome\n" +
            "        window.getSelection().empty();\n" +
            "      } else if (window.getSelection().removeAllRanges) {  // Firefox\n" +
            "        window.getSelection().removeAllRanges();\n" +
            "      }\n" +
            "    } else if (document.selection) {  // IE?\n" +
            "      document.selection.empty();\n" +
            "    }" +
            "    return text;\n" +
            "})()";

    @Override
    public void start(Stage stage) throws Exception {
        HTMLEditor wisdom = new HTMLEditor();
        wisdom.setHtmlText(HTML);

        Label absorbedWisdom = new Label();

        Button selectWisdom = new Button("Get Selection");
        selectWisdom.setOnAction(event -> {
            WebView webView = (WebView) wisdom.lookup("WebView");
            if (webView != null) {
                WebEngine engine = webView.getEngine();
                Object selection = engine.executeScript(SELECT_TEXT);
                if (selection instanceof String) {
                    absorbedWisdom.setText((String) selection);
                }
            }
        });

        VBox layout = new VBox(
            10,
            selectWisdom,
            absorbedWisdom,
            wisdom
        );
        layout.setAlignment(Pos.CENTER);
        layout.setPadding(new Insets(10));

        stage.setScene(new Scene(layout));
        stage.show();
    }

    public static void main(String[] args) {
        launch(SelectionExtractor.class);
    }

}

The question below posited incorrectly that there is no way to get the string the user selected from an HTMLEditor:

• Building Custom TextArea in JavaFX

The solution uses concepts from:

• Get the Highlighted/Selected text
• Clear Text Selection with JavaScript

Thanks is a brillant solution