Re: JsInterop: Casting native javascript objects in gwt

Thanks.

If it is any help, my code is here: https://github.com/bitwerk/jspoc/tree/master/src/main/java/com/acme

/Brian

Den torsdag den 5. november 2015 kl. 06.41.35 UTC+1 skrev Goktug Gokdogan:

This should work. I need to take a look why it fails.

On Wednesday, November 4, 2015 at 3:04:11 AM UTC-8, Brian Pedersen wrote:

Here is another variant, failing with the same exception

//In Java

package com.acme;

@JsType

public class IntParser {

  public static int parseArray(String[] args) {

    return Integer.parseInt(args[0]);

  }

}

//In Javascript
var num = com.acme.IntParser.parseArray(["42"]); // Should return 42, but throws 'Uncaught [object Object]'!

Den mandag den 2. november 2015 kl. 11.11.35 UTC+1 skrev Brian Pedersen:

Thank you Gortug for making my aware of the isNative attribute. Unfortunately the cast issue remains.

I have taken the example from the new jsinterop doc, and modified it to illustrate this: https://github.com/bitwerk/jspoc/tree/master/src/main/java/com/acme

// in Java

package com.acme;

@JsType(isNative = true)

interface Foo {

}

@JsType(isNative = true)

class Baz implements Foo{

  public int qux;

}

class Bar {

  @JsMethod

  public static int action(Foo foo) {

    Baz baz = (Baz) foo;
    return baz.qux;

  }

}

// in JavaScript

var baz = { qux: 42 };

com.acme.Bar.action(baz); // will return 42!

The image below demonstrates the issue at runtime.

I can't seem to find anywhere inside the generated javascript, where a class literal is assigned to the value 33.

/Brian

Den torsdag den 29. oktober 2015 kl. 09.37.48 UTC+1 skrev Goktug Gokdogan:

You can only implement java contract (e.g. PayLoad class) in javascript if they are marked as isNative. See the related section in the new jsinterop doc.

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