Re: Troubles Getting Started with JsInterop

Thank you Joseph for your comment.

Just a little bit more info, I've also tried with GWT 2.8.0-SNAPSHOT without success from:

<repository>   <id>google-snapshots</id>   <url>https://oss.sonatype.org/content/repositories/google-snapshots/</url>   <releases>     <enabled>false</enabled>   </releases>   <snapshots>     <enabled>true</enabled>   </snapshots>  </repository> What I find very odd is both the Nextgen GWT/JS Interop (Public) and the talk refer to the Js.js method and @JsExport in such a clear way..

On Saturday, February 14, 2015 at 4:52:35 AM UTC, Joseph Gardi wrote:

I was disappointed that there was no Js.js. I think there is no Js.js because according to the release notes they just started implementing experimental js annotations. It didn't say anything about Js.js. Js.js will probably be in 2.8. I think 2.8 will come out within the next couple of months although you can never be sure with an open source project. I don't know how to fix you're exporting problem but I wasn't able to get it working either. The release notes did say that there'd be bugs and this might be one of them. 

On Friday, February 13, 2015 at 8:47:20 PM UTC-5, Vasco Andrade Silva wrote:

Hi all,

I'm just starting with JsInterop but I can't figure out why some of the things aren't working.

First thing first: I'm using GWT 2.7 and I've setup maven/pom with "-XjsInteropMode" via "<jsInteropMode>JS</jsInteropMode>" configuration:

<!-- GWT Maven Plugin -->
<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>gwt-maven-plugin</artifactId>
  <version>${gwtVersion}</version>
  […]
  <configuration>
    […]
    <jsInteropMode>JS</jsInteropMode>
  </configuration>
</plugin>

I tested that the flag was being correctly set by passing wrong values and see that the compiler didn't run. I also followed https://github.com/gwt-maven-plugin/gwt-maven-plugin/issues/89

I have the following dependencies declared in my pom:

<dependency>
 <groupId>com.google.gwt</groupId>
 <artifactId>gwt-user</artifactId>
 <version>${gwtVersion}</version>
 <scope>provided</scope>
</dependency>
<dependency>
 <groupId>com.google.gwt</groupId>
 <artifactId>gwt-dev</artifactId>
 <version>${gwtVersion}</version>
 <scope>provided</scope>
</dependency>

So my problems are the following:

Issue #1: Can't find the JS.js method anywhere

In the "Deep dive JS Interop" from Ray Cromwell at GWT.create 2015 (slides) there are several slides that refer to a (static) "js" method. Nextgen GWT/JS Interop (Public) also refers this method. However I can't find this method... Where is it? How can I make my application use it?

I manage to make use of @JsType/@JsProperty via a JSNI method and an Overlay Type, but I what I really wanted is not having to write any JSNI at all.

@JsType

public interface UserJs {

@JsProperty String getName();

@JsProperty String getEmail();

}

public static native UserJs getUser() /*-{

return $wnd.User;

}-*/;

Issue #2: Can't make @JsExport work

I tried several combinations of @JsExport based on the previous slides and Nextgen GWT/JS Interop (Public) but couldn't manage to have any symbol exported to the global JS namespace. E.g. I couldn't make the following example from Ray's "Deep dive JS Interop" talk work:

@JsNamespace("mylib")
class Foo {
 @JsExport
 public static final int CONSTANT = 42;
}

mylib, Foo, or CONSTANT symbols aren't available in the JS runtime. What am I doing wrong?

Thank you in advance,

Vasco

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