[Laszlo-user] Deleting imported libraries clarification

[Cary Clark]

Robert Yeager suggested that I try:
        if (global[classname] != null) delete global[classname];
        if (lz[classname] != null) delete lz[classname];

While I don't get an error when these execute as I did when using the 
destroy() method, I do get the same warnings/info message when I load() 
the library again about the classes already being defined.  Any other 
suggestions?

Thanks,
Cary


Cary Clark wrote:
> I've put some optional code of my app into a dynamic library.  When an 
> instance of one of the classes is needed, I do a load on the library 
> and create the instance after the onload() handler.  I've been reading 
> the Software Engineer's Guide, aka Developer's Guide, in 15.5 
> "Deleting Imported Libraries".  It's pretty short, so I'll include it 
> here:
>
>
>    5. Deleting Imported Libraries
>
> To 'unload' an imported library, three things have to be done:
>
>   1.
>
>      Destroy all the instances that were created by the library. This
>      is done by calling |iii.destroy();| for each instance |iii|. Note
>      that if you have created references to the instance outside of the
>      library, you must delete those references.
>
>   2.
>
>      Destroy all classes that were created by the snippet. This is done
>      by calling |ccc.destroy();| for each class |ccc|. Note that if you
>      have created references to the class outside of the library, you
>      must delete those references.
>
>   3.
>
>      Unload the library. This is done by calling |sss.unload()`| where
>      |sss| is the name of the library (in the import tag).
>
> -----------------------------------------
> I have run destroy() on the instances of the classes from the imported 
> library.
>
> I'm not being successful on step 2.  I'm running OL 4.0.12 and tried 
> lz['employeeMaintenanceWindow'].destroy() but get the dreaded "ERROR 
> @vr.lzx#600: call to undefined method 'destroy'".  I can write to the 
> debug console the class name and reference:
>
> global class  employeeMaintenanceWindow  is «¡¿Class?!#12| 
> lz.employeeMaintenanceWindow».
>
> I am able to do step 3 and run the unload() of the library using the 
> name from the import.  However, when I run code that needs a class 
> from the library and I load() it again, I get these warnings:
>
> snippetLoaded loadmc= «LoadObj#2| undefined (loading)» 
> «LzLibraryLoader#18| undefined (loading)»
> WARNING: Redefining tag employeeMaintenanceWindow from 
> lz.employeeMaintenanceWindow to employeeMaintenanceWindow
> INFO: The global `employeeMaintenanceWindow` is already defined.  To 
> dynamically create a <employeeMaintenanceWindow> element, you will 
> have to use `lz.employeeMaintenanceWindow`.
>
> What's the syntax that I should use to remove the global class 
> definition?  Or is it still a requirement to do that?...or am I just 
> misunderstanding something...
>
> Thanks,
> Cary
>
>