Execute a Javascript function for a WebView from a JavaFX program

Question

I am trying to execute a Javascript function from a Java program. The Javascript function takes the content of a HTML file and highlights the occurrences of a particular word.

Is it possible to call a Javascript function from a webview object?

Answer 1

To run javascript in WebView you can use WebEngine.executeScript() method.

And there are plenty of ways to highlight text by javascript. E.g. Highlight word in HTML text (but not markup)

All together:

    WebView webView = new WebView();
    final WebEngine engine = webView.getEngine();
    engine.load("https://stackoverflow.com/questions/14029964/execute-a-javascript-function-for-a-webview-from-a-javafx-program");

    engine.getLoadWorker().stateProperty().addListener(
            new ChangeListener<State>() {
                @Override
                public void changed(ObservableValue ov, State oldState, State newState) {
                    if (newState == State.SUCCEEDED) {
                        engine.executeScript(
                                "function highlightWord(root,word){"
                                + "  textNodesUnder(root).forEach(highlightWords);"
                                + ""
                                + "  function textNodesUnder(root){"
                                + "    var n,a=[],w=document.createTreeWalker(root,NodeFilter.SHOW_TEXT,null,false);"
                                + "    while(n=w.nextNode()) a.push(n);"
                                + "    return a;"
                                + "  }"
                                + ""
                                + "  function highlightWords(n){"
                                + "    for (var i; (i=n.nodeValue.indexOf(word,i)) > -1; n=after){"
                                + "      var after = n.splitText(i+word.length);"
                                + "      var highlighted = n.splitText(i);"
                                + "      var span = document.createElement('span');"
                                + "      span.style.backgroundColor='#f00';"
                                + "      span.appendChild(highlighted);"
                                + "      after.parentNode.insertBefore(span,after);"
                                + "    }"
                                + "  }"
                                + "}"
                                + "\n"
                                + "highlightWord(document.body,'function');");
                    }
                }
            });


    Scene scene = new Scene(webView, 500, 500);

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();