ExecJS - Javascript object instances in Ruby?

Question

If I have a javascript object, I would normally interact with the object and its methods like this: ``` var obj = someObject.getInstance(); var result = obj.someMethod(); ``` where someMethod is defined like this: ``` someObject.prototype.someOtherMethod = function() { //do stuff }; someObject.prototype.someMethod = function(foo) { this.someOtherMethod(); }; ``` However, I am getting an error when I want to call someMethod in Ruby via ExecJS: ``` context = ExecJS.compile(# the javascript file) context.call('someObject.getInstance().someMethod') # Gives a TypeError where Object has no method 'someOtherMethod' ``` On the other hand, functions that are defined in the javascript module are working fine: ``` someFunction = function() { // do stuff }; # in Ruby context.call('someFunction') # does stuff ``` Can ExecJS handle Javascript objects and their methods, or am I only able to call functions with it? With regards to the specific application, I am looking into https://github.com/joenoon…

Accepted Answer

Discovered the answer through some experimentation. I managed to get the desired functionality by using context.exec() instead of call.

```
js = <<JS
var jsObj = someObject.getInstance();
var res = jsObj.someMethod();
return res;
JS

context.exec(js);
```

However, if your method returns a Javascript object, you have to serialize it first or otherwise parse the results so that it can be returned by ExecJS into a suitable Ruby object.

ExecJS - Javascript object instances in Ruby?

Solution

Problem