[Qt-qml] JavaScript with .pragma library cannot see Component object

[René Hansen]

This is because when you include .pragma, you are really indicating that
you want to create a stateless library. Here's an excerpt from the Docs
about integrating Javascript:

>>>
Stateless JavaScript libraries
Some JavaScript files act more like libraries - they provide a set of
stateless helper functions that take input and compute output, but never
manipulate QML component instances directly.

As it would be wasteful for each QML component instance to have a unique
copy of these libraries, the JavaScript programmer can indicate a
particular file is a stateless library through the use of a pragma, as
shown in the following example.

// factorial.js
 .pragma library

 function factorial(a) {
     a = parseInt(a);
     if (a <= 0)
         return 1;
     else
         return a * factorial(a - 1);
 }

The pragma declaration must appear before any JavaScript code excluding
comments.

As they are shared, stateless library files cannot access QML component
instance objects or properties directly, although QML values can be
passed as function parameters.
<<<

Hope this helps.

/René

On Fri, 2010-11-19 at 16:17 +0000, ext ext-ivailo.iliev at nokia.com wrote:
> Hi,
> 
> I'm trying to create JS library with QML. As written in the documentation I write in the beginning of the JS file .pragra library
> everything is ok - now my library is not stuck to one QML file and I can everything is ok
> 
> the problem is that I cannot see Component.Ready and Component - it's not null, but I have error directly when I want to access it :
> ReferenceError: Can't find variable: Component.
> 
> if I remove the .pragma library then everything is ok - I can see Component and Comonent.Ready
> 
> My question is:
> 
> Is it done on purpose? Is there any reason why I cannot use / and see / those objects in the library is "object". Just a quick tip - Qt object is there - I can see it with or without marking my JS as library.
> 
> For now I can just "wrap" the error - as Component.Ready is 1 - I will just replace it with 1, but it will be nice if I know what else I can and cannot do with libraries and not.
> 
> Best Regards,
> Ivo
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