从 JavaFX 程序为 WebView 执行 Javascript 函数
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原文地址: http://stackoverflow.com/questions/14029964/
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Execute a Javascript function for a WebView from a JavaFX program
提问by Adesh singh
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.
我正在尝试从 Java 程序执行 Javascript 函数。Javascript 函数获取 HTML 文件的内容并突出显示特定单词的出现。
Is it possible to call a Javascript function from a webview object?
是否可以从 webview 对象调用 Javascript 函数？
回答by Sergey Grinev
To run javascript in WebViewyou can use WebEngine.executeScript()method.
要在其中运行 javascript，WebView您可以使用WebEngine.executeScript()方法。
And there are plenty of ways to highlight text by javascript. E.g. Highlight word in HTML text (but not markup)
并且有很多方法可以通过 javascript 突出显示文本。例如，突出显示 HTML 文本中的单词（但不是标记）
All together:
全部一起：
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();
回答by M. Atif Riaz
You can use ScriptEngine to execute a javascript. initialize ScriptEngine, then load the script in and evaluate it, as shown in below mentioned code
您可以使用 ScriptEngine 来执行 javascript。初始化ScriptEngine，然后加载脚本并对其进行评估，如下面提到的代码所示
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
// JavaScript code in a String
String script = "function hello(arg) { print(arg); }";
// evaluate script
engine.eval(script);
