Thanks again Thomas,
Yep, getters worked. I thought I tried this previously, but obviously not.
I didn't need the JsProperty annotation. maybe because the interface is
marked as native:
@JsType(isNative = true, name = "?", namespace = JsPackage.GLOBAL)
public interface CrazyGamesUser {
String getUsername();
String getProfilePictureUrl();
}
I'll update
https://www.gwtproject.org/doc/latest/DevGuideCodingBasicsJsInterop.html to
mention this is how you access attributes using JsInterop.
Cheers.
On Tuesday, 14 January 2025 at 4:19:36 am UTC+11 Thomas Broyer wrote:
> On Monday, January 13, 2025 at 10:14:33 AM UTC+1 [email protected]
> wrote:
>
> Hi Thomas,
>
> Can an interface have attributes? I thought interfaces can only have
> methods?
>
>
> Yes, you'd have to make them getters (probably need to annotate them with
> @JsProperty too)
>
>
> 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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