using JSNI to call JAVA methof from handwritten Javascript

Question

I have a piece of code i haven been written, And i don't understand why its not working

I have written:

public class MyUtility {
    public static int computeLoanInterest(int amt, float interestRate, int term) {
       return (amt*term);   
    }
    public static native void exportStaticMethod() /*-{
        $wnd.computeLoanInterest =
        $entry(@com.myapp.appname.client.MyUtility::computeLoanInterest(IFI));
    }-*/;
}

on my client java entrypoint:

       public void onModuleLoad() {
           MyUtility.exportStaticMethod();
       }

and on my handwritten javascript code:

    <head>
    <script type="text/javascript" language="javascript" src="projv1/projv1.nocache.js"></script>
    <script type="text/javascript">
        function mainl(){
          var it=window.computeLoanInterest(5,2,2);
          alert(it);
        }
    </script>
    </head>

    <body onload="mainl()">
    </body>

but i'm getting an error on the console of the browser:

Uncaught TypeError: undefined is not a function

possible duplicate of Uncaught TypeError: undefined is not a function on loading jquery-min.js — claj
– claj, Commented May 5, 2014 at 10:42

Braj · Accepted Answer · 2014-05-05 13:23:57Z

0

Call the function after exporting to JavaScript via JSNI that is more precise and accurate.

public static native void exportStaticMethod() /*-{
    $wnd.computeLoanInterest = $entry(@com.myapp.appname.client.MyUtility::computeLoanInterest(IFI));

    $wnd.mainl();
}-*/;

edited May 5, 2014 at 13:23

answered May 5, 2014 at 10:52

Braj

46.9k5 gold badges63 silver badges77 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Avi A Over a year ago

this answer is the correct one, But i just wan't to know if it's normal that the alert is showed after 7 seconds from the initial time that the page has been loaded?

Braj Over a year ago

yes nocache.js takes time to load and to export the method to JavaScript. body onload() doesn't mean that EntryPoint#onModuleLoad() has been called.

Braj Over a year ago

It depends on the size of nocache.js also. There will no issue if you call it after exported it to JavaScript.

Vadim · Accepted Answer · 2014-05-05 11:29:29Z

0

This should work:

public static native void exportStaticMethod() /*-{
    $wnd.computeLoanInterest = function(amt, interestRate, term) {
        return ($entry(@com.myapp.appname.client.MyUtility::computeLoanInterest(IFI))(amt, interestRate, term));
    }
}-*/;

answered May 5, 2014 at 11:29

Vadim

1,1888 silver badges19 bronze badges

Collectives™ on Stack Overflow

using JSNI to call JAVA methof from handwritten Javascript

2 Answers 2

3 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related