Run JavaScript from Native Java

I wrote in previous post Execute Javascript code from Java Code how to execute java script in Oracle ADF.
But in this post I will explain how to call Javascript from native Java.



The following code snippets will illustrate how to evaluate Javascript code and invoke functions and get return value.

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class CallJavaScript {
    public static void callJsCode(String jsCode) throws ScriptException,
                                                        NoSuchMethodException {

        // Retrieving the Javascript engine
        ScriptEngine se =
            new ScriptEngineManager().getEngineByName("javascript");
        try {
            se.eval(jsCode);
        } catch (ScriptException e) {
            e.printStackTrace();
        }

        try {
            Invocable jsinvoke = (Invocable)se;
            System.out.println("myFunction(2) returns: " +
                               jsinvoke.invokeFunction("myFunction", 2, 4));
        } catch (ScriptException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }

    }
}

Then You can call this code using for example

       try {
            String jsCode =
                "function myFunction(x,y){return x+y;}";
            CallJavaScript.callJsCode(jsCode);
        } catch (ScriptException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }      

The output of previous code will be

myFunction(2) returns: 6.0

Thanks

Execute Code in Page Load in ADF

I want to execute a piece of code in page load, For implementing this request I can do it using two solutions.

1- PagePhaseListener Interface

PagePhaseListener allows to write global code which executes in every page at my application.
I will create a class implements oracle.adf.controller.v2.lifecycle.PagePhaseListener.PagePhaseListener Interface and overide afterPhase method and then add this class as Phase Listener in  /META-INF/adf-settings.xml

2- BeforePhase Property of View

I will bind this property to a method in backing bean which contains the code I want to execute.

Execute Javascript code from Java Code

In ADF framework you can execute Javascript code from Java code using the below method

   public static void runJavaScriptCode(String javascriptCode) {  
     FacesContext facesCtx = FacesContext.getCurrentInstance();  
   
     ExtendedRenderKitService service = Service.getRenderKitService(facesCtx, ExtendedRenderKitService.class);  
   
     service.addScript(facesCtx, javascriptCode);  
   }  

Import the following classes

 import javax.faces.context.FacesContext;  
 import org.apache.myfaces.trinidad.render.ExtendedRenderKitService;  
 import org.apache.myfaces.trinidad.util.Service;  

You can call previous method from anywhere from your code
For example I will display alert using javascript

 runJavaScriptCode("alert(\"My name is Mahmoud\");");  

Thanks

Genius ADF Buttons

I will present some genius ADF buttons that doing specific actions using Javascript