TypeError: I could use some explanation

[Kasmeroglu, Daniel]

On Mi, 2015-12-16 at 20:11 +0530, Sundararajan Athijegannathan wrote:
> If the script function t4 expects that "t4_context" is a script object 
> and so calls Object.prototype function or any JS function that expects 
> "this" to be a script object, you'll get a TypeError (per spec.).  We 
> need bit more information on the code of "t4" to help further.
> 
The code of 't4' is a problem here as it's generated by Handlebars. It's
ScriptObjectMirror presentation results in:

--8>--
[_setup -> function (setupOptions) {
	    if (!compiled) {
	      compiled = compileInput();
	    }
	    return compiled._setup(setupOptions);
	  }]
[_child -> function (i, data, blockParams, depths) {
	    if (!compiled) {
	      compiled = compileInput();
	    }
	    return compiled._child(i, data, blockParams, depths);
 }]
--<8--

However I don't expect anyone to investigate this code further as I
think this might require quite a bit of work
(https://github.com/wycats/handlebars.js/tree/master). It's essentially
a template which will render it's content with the supplied hash in
question.

Last but not least I figured out a workaround which seem to work fine.
I'm simply adding the entries of the map 't4_context' and I'm generating
the template function call accordingly. F.e.

> t4(t4_context) 

turns into

> t4({'assets': assets, 'def': def})

Nevertheless if someone knows an answer to the problem it would be nice
to know.



> -Sundar
> 
> On 12/16/2015 7:31 PM, Kasmeroglu, Daniel wrote:
> > Hi there,
> >
> > First of all: thanks for the great work with Nashorn.
> > Unfortunately I'm currently a little bit stuck as I don't get what I'm
> > doing wrong here.
> > Here's a simple code snippet that explains what I'm doing:
> >
> > --<8--
> > ScriptEngine engine = ...
> > Map<String, Object> context = ...
> > engine.put("t4_context", context);
> > engine.eval("t4(t4_context);");
> > --8>--
> >
> > The variable 't4' is a compiled template generated through Handlebars
> > (so it's a function taking a hash).
> > Unfortunately I don't get it running as there's the following complain:
> >
> > --<8--
> > Caused by: <function>:30 TypeError: {assets=dodo} is not an Object
> > --8>--
> >
> > It's clear to me that the issue is caused since the java object
> > 'context' isn't an instance of 'ScriptObject'. However it isn't clear to
> > me why this happens.
> >
> > It would be nice to give me a hint of what I'm doing wrong or to point
> > me to some helpful documentation.
> >
> > Thanks in advance.
> >
> >
> 

-- 
Dipl.-Inform. Daniel Kasmeroglu, Java Developer Advanced

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