{ getUsername: function() { .... }, getProfilePictureUrl: function() { .... } }
At the bottom of the jsinterop page there is a link to the JsInterop spec: https://docs.google.com/document/d/10fmlEYIHcyead_4R1S5wKGs1t2I7Fnp_PaNaa7XTEk0/edit
It states that you need @JsProperty in that case. GWT compiler must know if it should treat the interface method as method or as property.
-- J.
Craig Mitchell schrieb am Montag, 13. Januar 2025 um 23:02:07 UTC+1:
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 ma...@craig-mitchell.com 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.htmlRule 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 ma...@craig-mitchell.com 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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