CODEWITHSUNDEEP
javascriptgwtgwt-jsinterop
ezpzlmnsqz1337
ezpzlmnsqz1337

Reputation: 424

GWT JsType array casting

When I have JSON object like:

{
    "asset": {
        "properties": [{
            "name": "xxx",
            "id": "yy"
        }]
    }
}

Then I have JsInterop wrappers like so:

@JsType
public class Asset {

   @JsProperty
   public native jsinterop.base.JsArrayLike<Property> getProperties();

}

and:

@JsType
public class Property {

   @JsProperty
   public native String getName();
   @JsProperty
   public native String getId();
}

When somewhere in code I try to access the data, it fails when I try to access the attributes of the Property object.

For example:

Asset asset = dataProvider.getAssets();
console.log(assets) //works ok: => {"properties":Array(1)}
console.log(asset.getProperties()) //works ok:  => Array(1)
console.log(asset.getProperties().getAt(0)) //works ok:  => {"name":"xxx","id":"yy"}
console.log(asset.getProperties().getAt(0).getName() //does not work:  => Uncaught exception: undefined

OR if I make the Asset and Property class (isNative=true):

Uncaught exception: Cannot read property "company" of undefined.

I checked and if I compile the app when I try to get the name or the id, the code compiles to:

castTo(asset.properties[0], 125)

OR if (isNative=true):

castToNative(asset.properties[0], $wnd.com.company.project.Property)

First I thought its because of my implementation of the wrapper for array, but the I discovered the "jsinterop.base.JsArrayLike", so I thought that will solve my problem, but the error remained the same. Am I missing someting? I would really like to use JsInterop instead of JSNI methods and Overlay types, but I cannot get past these arrays.

Upvotes: 0

Views: 571

Answers (1)

Thomas Broyer
Thomas Broyer

Reputation: 64561

When you're handling data from JSON, you get plain old Object and Array objects. So you need to use 

@JsType(isNative=true, namespace=JsPackage.GLOBAL, name="Object")

or you could use interfaces instead, which won't do casts and type checks.

Upvotes: 3

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