How to create an arbitrary js Object in C++?

[sasmaster]

Hi.
I am trying to create a js style dynamic Object in C++ and set its properties in runtime.
Here is what I do:

   	emscripten::val obj = emscripten::val::object();
 	obj.set("a", 1);
	obj.set("b",2); 

Then in browser I have this error:

Import #116 module="env" function="_emval_new_object" error: function import requires a callable

What am I doing wrong?I have found this example here.

I also tried created an object like this:

emscripten::val JSObject = emscripten::val::global("Object");	 
emscripten::val obj = JSObject.new_();
obj.set("a", 1);
obj.set("b",2); 

which results in the same error.

[sbc100]

Can you share your full link command? Are you using emscripten's generated JS file to load the wasm? Are you linking with -lembind?

[sasmaster]

Yes I am. Here are the linker flags:

-sINITIAL_MEMORY=134217728 -sMAX_WEBGL_VERSION=2 -sUSE_GLFW=3 -sFULL_ES3 -sEXIT_RUNTIME -lembind

But, here is one thing I am not sure about:
The code above is created inside a member function of a C++ class which is not exposed via embind. Can it be somehow related?

[sbc100]

How are you loading your wasm file. _emval_new_object is defined in JS and will end up being part of the JS loading code:

emscripten/src/embind/emval.js

Lines 140 to 144 in 350cb5f

	_emval_new_object__sig: 'p',
	_emval_new_object__deps: ['$Emval'],
	_emval_new_object: function() {
	return Emval.toHandle({});
	},

.

The only way I can think of that it wouldn't be defined when the wasm module is loaded is if you are trying to load the module youself maybe?

[sasmaster]

Oh sh*t! What a stupid mistake! I have forgot to copy the accompanying .JS file into web dir. Yes, you're right, that file has been missing. Now that error is gone. But I am still stuck with the problem of instantiating a class with object of callbacks in constructor. Any chance you take a look at this issue? Thanks a lot!.