[Laszlo-user] Help with replicators ("__LZdepChildren has no properties")

[Henry Minsky]

Yeah, with DHTML, the browser caches stuff pretty aggressively. I have
gotten
into the habit of always clearing the data cache (in Firefox) when doing any
development with the LFC or wrappers.



On 7/19/07, Yang <a1pwak602 at sneakemail.com> wrote:
>
> Whoops. I guess my browser was just not reloading the .js file(s). It
> works!
>
> Yang
>
> On 7/17/07, Yang a1pwak602-at-sneakemail.com |laszlo|
> <...> wrote:
> > On 7/17/07, P T Withington ptw-at-openlaszlo.org |laszlo|
> > <...> wrote:
> > > On 2007-07-16, at 23:48 EDT, Yang wrote:
> > >
> > > > Now, things works fine in Flash. However, in DHTML, if I change the
> > > > dataset's columns so as to trigger re-execution this code, I get an
> > > > error on the line I labeled above. The error is:
> > > >
> > > > ERROR: http://localhost:8080/lps-4.0.2/lps/includes/lfc/LFCdhtml-
> > > > debug.js:12699:
> > > > this.__LZdepChildren has no properties
> > > >
> > > > This one really has me stumped. 'replicator' seems to exist, yet I'm
> > > > not able to remove it. I have no idea what this error message is
> > > > talking about, and the source it's referring me to is indecipherable
> > > > (I'm guessing it's generated from the lfc sources in subversion).
> Any
> > > > help?
> > >
> > > What you are seeing is an uncaught error in the runtime that is being
> > > handled by the last resort error handler.  The line number refers to
> > > the compiled LFC.  If you inspect that file at that line, you can
> > > search back for a comment of the form:
> > >
> > > /* -*- file: data/LzDatapointer.lzs#268.27 -*- */
> > >
> > > which will give you the source file.  Hm.  That is not right.  I
> > > looks like these comments are being dropped in some cases.  http://
> > > jira.openlaszlo.org/jira/browse/LPP-4298
> > >
> > > But poking around in the sources I can see that your error is
> > > occurring in LzDatapath's destroy method:
> > >
> > > @@ -381,7 +387,8 @@
> > >       //if immediate parent was deleted, don't worry about the
> > > datpaths dependent
> > >       //on this one -- they'll be deleted too
> > >       if ( ! this.immediateparent.__LZdeleted ){
> > > -        if ( this.__LZdepChildren.length ){
> > > +        if ( this.__LZdepChildren != null &&
> > > +             this.__LZdepChildren.length ){
> > >               //need to assign __LZdepChildren to parent
> > >               var dnpar = this.immediateparent.searchParents
> > > ( "datapath" ).
> > >
> > > datapath;
> > >
> > > http://jira.openlaszlo.org/jira/browse/LPP-4299
> > >
> > >
> > >
> > >
> >
> > Thanks for that. I just applied the change in 4299 (to
> > LFCdhtml-debug.js, LFCdhtml-profile.js, and LFCdhtml.js), but that
> > doesn't seem to have fixed the error. I'm still seeing the same
> > message.
> >
> > Yang
> >
>



-- 
Henry Minsky
Software Architect
hminsky at laszlosystems.com
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