Oh, wait. Leaving it as a class, and making the name "Object" worked!
@JsType(isNative = true, name = "Object", namespace = JsPackage.GLOBAL)
public class CrazyGamesUser {
public String username;
public String profilePictureUrl;
}
Woohoo! Thanks Thomas!
That probably should be documented somewhere (apologies if it is, I thought
I read through all the doco).
On Monday, 13 January 2025 at 8:14:33 pm UTC+11 Craig Mitchell wrote:
> Hi Thomas,
>
> Can an interface have attributes? I thought interfaces can only have
> methods?
>
> So if I make it:
>
> @JsType(isNative = true, name = "?", namespace = JsPackage.GLOBAL)
> public interface CrazyGamesUser {
> }
>
> I can't see how I can add the attributes:
>
> public String username;
> public String profilePictureUrl;
>
> ?
>
> Thanks again.
>
> On Monday, 13 January 2025 at 7:03:43 pm UTC+11 Thomas Broyer wrote:
>
>> Use an interface rather than a class.
>>
>> See the note about castability in the javadoc:
>> https://javadoc.io/doc/com.google.jsinterop/jsinterop-annotations/latest/jsinterop/annotations/JsType.html
>>
>> Rule of thumb is: use a class only if it maps to a "constructor" in JS,
>> i.e. something you'll either create an instance of, or use in an
>> "instanceof" check; for everything else (generally something you get from
>> another API or "receive" in a callback), use an interface.
>>
>> In this case, I think you could also use name="Object".
>>
>> On Monday, January 13, 2025 at 7:47:28 AM UTC+1 [email protected]
>> wrote:
>>
>>> Overlay types do work, and make it a little better:
>>>
>>> public class CrazyGamesUser extends JavaScriptObject {
>>> protected CrazyGamesUser() {}
>>> public final native String getUserName() /*-{ return this.username;
>>> }-*/;
>>> public final native String getProfilePictureUrl() /*-{ return
>>> this.profilePictureUrl; }-*/;
>>> }
>>>
>>> However, it would be great if JsInterop just worked, so I could just do:
>>>
>>> @JsType(isNative = true, namespace = JsPackage.GLOBAL)
>>> public static class CrazyGamesUser {
>>> public String username;
>>> public String profilePictureUrl;
>>> }
>>>
>>> Maybe I'm missing something?
>>> On Monday, 13 January 2025 at 4:02:40 pm UTC+11 Craig Mitchell wrote:
>>>
>>>> I'm calling some existing JS that returns a JS Object which I've
>>>> implemented in JsInterop:
>>>>
>>>> @JsType(isNative = true, namespace = "window.CrazyGames.SDK")
>>>> public static class JsUser {
>>>> public native Promise<CrazyGamesUser> getUser();
>>>> }
>>>>
>>>> I can happily call it:
>>>> sdk.user.getUser()
>>>> .then(user -> {
>>>> // Do something with the user
>>>> return null;
>>>> })
>>>> .catch_(error -> {
>>>> return null;
>>>> });
>>>>
>>>> This issue is I'm struggling to work out how to define the return
>>>> object "CrazyGamesUser". The actual JS object is just this:
>>>> {
>>>> "username": "SingingCheese.TLNU",
>>>> "profilePictureUrl": "
>>>> https://images.crazygames.com/userportal/avatars/4.png";
>>>> }
>>>>
>>>> If I define it like this:
>>>>
>>>> @JsType(isNative = true, namespace = JsPackage.GLOBAL)
>>>> public static class CrazyGamesUser {
>>>> public String username;
>>>> public String profilePictureUrl;
>>>> }
>>>>
>>>> I get a java.lang.ClassCastException.
>>>>
>>>> So if I set the name to "?":
>>>>
>>>> @JsType(isNative = true, name = "?", namespace = JsPackage.GLOBAL)
>>>> public static class CrazyGamesUser {
>>>> public String username;
>>>> public String profilePictureUrl;
>>>> }
>>>>
>>>> Then I get a compile error:
>>>> '?' can only be used as a name for native interfaces in the global
>>>> namespace.
>>>>
>>>> But if I make it an interface, I can't have the member variables.
>>>>
>>>> If I do remove the member variables, it does work, and I can access
>>>> them via some JSNI:
>>>>
>>>> public static native String getUsername(CrazyGamesUser instance) /*-{
>>>> return instance.username;
>>>> }-*/;
>>>>
>>>> But that's really ugly. What's the correct approach here?
>>>>
>>>> Thanks.
>>>>
>>>
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![https://images.crazygames.com/userportal/avatars/4.png"](https://images.crazygames.com/userportal/avatars/4.png"){kind=link}