Is there a way to get a (return) value back after running Javascript statements in the backing bean?

Question

I have a usecase  where I need to run a javascript function from within the backing bean and get the value returned by the function.
Example:
          In Java I have two variables  x and y, I want the javascript to return the larger value z.
          This is what I'm doing, but I have no means to get the values of variable z.
          StringBuilder script = new StringBuilder();
          script.append("var  z;");
          script.append("var  x = " + x + ";");
          script.append("var  y = " + y + ";");
          script.append("if  (x > y)  z = x  else z = y");
          FacesContext fctx = FacesContext.getCurrentInstance();
          ExtendedRenderKitService erks = Service.getRenderKitService(fctx,
          ExtendedRenderKitService.class); erks.addScript(fctx, script);
     The actual usecase is a bit complicated. It's a dragNdrop paradigm.
     I cannot capture the muse Release event (DropEvent ?) in the client side as (most likely) it is captured by ADF.
     The drop target is a RichTextEditor. I need to convert the DropEvent.getDropX() and DropEvent.getDropY() to get the caret position in the text editor.
Any other solution to the issue is highly appreciated.
Thanks,
-ab

Answer 1

you can try it!
erks.addScript(fctx, js_funcation_name("'"+x+"'","'"+y+"'","'"+x+"'","'"+x+"'",.....));//bean-> javaScript
add javascript:
               AdfCustomEvent.queue(p, 'XXXXX', {parameter:parameter_value},true);
add:
<af:serverListener type="XXXXX" method="#{ManageBean.funcation}"/>//js->bean