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Bidirectional JavaFX 2.2 communication in javascript and webview

I am working on JavaFX 2.2, I use webview to integrate the html code into the JavaFX scene and was able to load the html correctly. I followed this link and tried to pass some objects from javascript to webview / controller, but I get null values ​​from the java side.

I saved the interface object in JSObject as shown below

webEngine.getLoadWorker().stateProperty().addListener( new ChangeListener<State>() { @Override public void changed(ObservableValue<? extends State> ov, State oldState, State newState) { if (newState == State.SUCCEEDED) { JSObject win = (JSObject) webEngine.executeScript("window"); win.setMember("app", new JavaApp()); } } } );

I created a class

 public class JavaApp { public void exit() { Platform.exit(); } public void print(Date date) { System.out.println("Parm:"+date); } public Date getValue() { return new Date(); } }

My html

 <html lang="en"> <head> <script type="text/javascript"> function callJava(){ app.print(new Date()); var val = app.getValue(); app.print(val); } </script> </head> <body> <p>Help</p> <p><a href="about:blank" onclick="callJava();">Exit the Application</a></p> </body> </html>

In the above code, I always get null values ​​printed in the JavaApp.print () method. An interesting point is that I changed the Date parameter to String in the print method and passed the string from javascript, I get the correct values.

How can I pass objects in this case, especially a Date object. Any help is ambiguous

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1 answer

Java does not know the Date javascript class.

2.3 Data Type Conversions

You can pass a javascript object in Java , (you should wrap it in a JSObject ), but you can only get parameters like these:

  • Numbers
  • Boolean,
  • String
  • arrays
  • The same object that you already nested in javascript.

My solution for you:

 public class JavaApp { public void exit() { Platform.exit(); } //public void print(Date date) { // System.out.println("Parm:"+date); // } public void print(long date) { System.out.println("Parm:"+new Date(date)); } public Date getValue() { return new Date(); } } <html lang="en"> <head> <script type="text/javascript"> function callJava(){ // app.print(new Date()); app.print(new Date().getTime()); var val = app.getValue(); app.print(val); } </script> </head> <body> <p>Help</p> <p><a href="about:blank" onclick="callJava();">Exit the Application</a></p> </body> </html>
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Source: https://habr.com/ru/post/1443640/

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