[webkit-dev] JavaScriptCore subclass native class created with JSClassCreate in javascript code

[Geoffrey Garen]

You’ll need to manually copy Function.prototype.apply to the TestClass prototype.

Another option is “Function.prototype.apply.call(TestClass, this, arguments)”.

Geoff

> On Oct 2, 2014, at 8:26 AM, Moritz Moeller <mmoeller at mxs.de> wrote:
> 
> Hi,
> 
> I’ve created a javascript class in native code (i.e. JSClassCreate, JSObjectMakeConstructor etc.) and want to subclass this class in javascript.
> 
> So pretty much:
> 
>     JSClassDefinition classDef = kJSClassDefinitionEmpty;
>     classDef.className = "TestClass";
>     classDef.getProperty = class_getProperty;
>     classDef.setProperty = class_setProperty;
>     JSClassRef classRef = JSClassCreate(&classDef);
>     JSObjectRef constructor = JSObjectMakeConstructor(ctx, gClassRef, class_constructor);
>     JSObjectSetProperty(ctx, JSContextGetGlobalObject(ctx), JsString("TestClass"), constructor, 0, NULL);
> 
> class_constructor does:
>     return JSObjectMake(ctx, classRef, NULL);
> 
> This works, so I can do
>     var test = new TestClass();
>     test.field = 1;
> 
> and both class_constructor and class_setProperty is called.
> 
> Now I’m trying to subclass the TestClass:
>     function SubClass()
>     {
>         TestClass.apply(this, arguments);
>     }
> 
> here it already got the problem that TestClass - being a constructor - does not have .bind() or .apply().
> 
> Does someone know how to get this working?
> 
> Thank you very much,
> 
> Mo
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