On Saturday, November 18, 2017 at 9:52:09 AM UTC+1, Chris L wrote:
>
> I'm trying to create a shared model in my GWT 2.8.2 application that I can
> use both at the server and in GWT client code.
>
> My research/Google Fu tells me that this might be possible with JsInterop
> but since I'm new to JsInterop I'm just not sure.
> I've done some experiments but I've run into a couple of issues with the
> biggest being that I can't have my model accessor methods if I make the
> model native. The compiler tells me that they have to be native or
> abstract.
>
> What I'd like to do with my model is:
> @JsType
> public class User {
> private double id;
> private String code;
> private String name;
>
> @JsConstructor
> public User() {
> }
>
> @JsIgnore
> public User(double id, String code, String name) {
> this();
>
> this.id = id;
> this.code = code;
> this.name = name;
> }
>
> ...
> @JsProperty
> public double getId() {
> return id;
> }
>
> @JsProperty
> public double setId(double id) {
> this.id = id;
> }
> ...
> }
>
> Then in my GWT application I'd like to do this:
>
> public class JsTypes {
>
> public static native <T> T getJsTypeObject(JavaScriptObject
> result)/*-{
> return result;
> }-*/;
> }
>
> //called after REST response from server
> private void onCallback(String json) {
> Console.log("JSON:" + json);
> JavaScriptObject result = JsonUtils.safeEval(json);
> User user = JsTypes.getJsTypeObject(result);
> ...
> //do something with user
> }
>
> Any ideas or suggestions would be greatly appreciated.
>
If you're going to use the type from a JSON.parse(), you might want to use
a native type mapping to a simple JS Object, rather than exporting a to a
JS class that you'll never actually use (and that could cause
ClassCastException⋅s at runtime).
@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Object")
public class User {
@JsProperty private double id;
@JsProperty private String code;
@JsProperty private String name;
@JsIgnore
public User(double id, String code, String name) {
…
}
// Didn't check if you still need the 0-args constructor
@JsOverlay public double getId() { return id; }
@JsOverlay public void setId(double id) { this.id = id; }
…
}
User user = (User) JsonUtils.<JavaScriptObject>safeEval(json);
or use elemental2-core & jsinterop-base:
User user = Js.cast(Global.JSON.parse(json));
or a custom JsInterop mapping for JSON.parse:
@JsMethod(namespace = "JSON") private static native User parse(String json);
…
User user = parse(json);
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