[Javascript] Any creative way to pullhtmlcontentsamewayjsfilesare pulled

Fri Apr 4 13:10:10 CST 2003

  I think your idea has a lot of merit, but I'd like to add one caveat --

  I've tried setting a bogus variable at the bottom of a load for an HTML
document and using it as a flag to tell whether the window is fully "built".
I'm here to tell you it doesn't work -- at least not reliably, and not 100%
of the time.

  The problem is that the HTML build is (for all intents and purposes) a
multi-threaded process.  Things will come up on your screen as little boxes
with red-X's or "broken code" object icons, while the stuff below them gets
put together.  Then, as the various elements complete loading, the little x
bodes or broken-code icons will be replaced by the elements they were acting
for as place holders.  Hence, your 'I_am_done' variable might get built a
lot sooner than you anticipate.

  The method I'm exploring (as an adjunct to your excellent idea of using an
IFRAME wrapper) is to use a "document.watch()" call, with the appropriate
event used as a trigger within the watch.  The designated event handler will
kick in, and the necessary action occur AT THE DOCUMENT LEVEL, rather than
as a consequence of a single changed variable field.  Sort of like an
'onLoad' event, but rather one that works AFTER the build, rather than at
the start.  (onLoad is awfully nebulous -- it doesn't really kick in after
the load is complete, and it doesn't really kick in at the very earliest
beginning before any objects are on the page.  In short, it is dangerous to
rely on onLoad.)  I think if I can build an event trap handler around the
right event [and there are literally hundreds of them] this might actually
work pretty well.

  One rather crude method is to write the file that goes into the
zero-dimensioned IFRAME window with some kind of loop that does a
document.close() once the last line is in place.  The document.close() is
one thing I know I can pick up on with a 'watch()' handler.

  Anyway, I'm still in the preliminary research stage on this.

  -- Dave Lovering

----- Original Message -----
From: "DEV" <dev at qroute.net>
To: "[JavaScript List]" <javascript at LaTech.edu>
Sent: Friday, April 04, 2003 10:59 AM
Subject: Re: [Javascript] Any creative way to
pullhtmlcontentsamewayjsfilesare pulled

> How about this idea that I posted in the ASP list a few minutes ago. I
think
> it is worth sharing with you.
>
> But I have just thought of a trick towards accomplishing my initial goal.
It
> is a creative way and it might just work.
> Here are the steps for those who are interested;
>
>
> Have an iframe and ship your front page formatted htm content ( say
> myContent.htm ) from your server as is.
> And set the width and height of that iframe to 0 so it does not show up on
> the client screen.
>
> Now, Set a JS timer on the main page ( which contains the 0 border
iframe ).
> Let that timer keep an eye on a variable value just to see if it is true
or
> false. Until it is seen as true,  keep on running that timer querying say
> 10rps.
>
> How is that variable change its initial value from false to true ?
> That will be carried out by the last line ( parent.ThatVariable=true  ) in
> the document in the iframe. The pure purpose in this whole business is to
> let the parent ( the container document of the iframe ) know that "the
> iframe has loaded in its entirety"....  There could be better ways of
doing
> this but this also does the job right. Maybe there is a way one can query
an
> iframe window to see when it completes its loading.
>
> Anyway when the timer senses the fact that iframe is done, fires a
procedure
> and terminates itself.
> The procedure then takes over and uses the innerHTML method.
>
> Aha !.. Now the js routines has all the power to do what it needs to be
done
> by that innerHTML code. Do all sorts of replace strings and
document.writes
> !...
>
> Since the JS procedures runs before the browser page lays out takes place,
> you will never run into the issues of scrollbars appearing in the middle
of
> your page, just because you wanted to do the include abstraction on the
> client.
>
> With that, one gets the iframe power without the scroll bars effect and
> without worrying about dhtml menu roll overs etc.
>
>
>
>
>
> ----- Original Message -----
> From: "David Lovering" <dlovering at gazos.com>
> To: "[JavaScript List]" <javascript at LaTech.edu>
> Sent: Monday, March 31, 2003 7:49 PM
> Subject: Re: [Javascript] Any creative way to pull
> htmlcontentsamewayjsfilesare pulled
>
>
> > The 'move-around-a-big-pane-just-like-Acrobat' window effect can be
> achieved
> > by using a rather complex interlinkage of window.offset attribute
changes
> > tied to the cursor 'pegging out' on the window boundaries.  The
> > 'hand-drag-the-whole-window' function can be achieved (in theory) by
> > window.moveTo and window.moveBy directives, again linked to the
mouse-drag
> > events.
> >
> > The mechanics are somewhat brutal, as you have to update the screen
> geometry
> > on the same timescale as a keyboard/mouse-button debounce (roughly
50ms).
> >
> > However, I'm ressurecting my memories of how to do it, and may be able
to
> > hack something together over the next few days.  It is just close enough
> to
> > being impossible to interest me.  [I specialize in the impossible].
> >
> > -- Dave Lovering
> >
> > ----- Original Message -----
> > From: "BEKIM BACAJ" <trojani2000 at hotmail.com>
> > To: <javascript at LaTech.edu>
> > Sent: Monday, March 31, 2003 7:02 PM
> > Subject: Re: [Javascript] Any creative way to pull html
> > contentsamewayjsfilesare pulled
> >
> >
> > > Thanks David,
> > > I never heard about anything like DynApi's nor similar untill tonight.
> > > As I browse the internet, I find out that DynApi is nothin but a huge
> > > collection - library, of reusable scripts, and can't do anything
> > > particularly advanced, comparing to other hand witten scripts.
> > >
> > > I will submit some scripts of my own, that one can find them less
> > practical
> > > than entertaining, something like making page elements absolutely
> > > positioned, after this becoming able to move them across the page,
> > recording
> > > the move, playing it back or backwards, and what is most important for
> me,
> > > very short (few lines) and very fast executionable.
> > >
> > > At end, why write a script when one is ready to share it.
> > >
> > > Looking forward in reading from you.
> > >
> > >                                       Regards, Bekim.
> > >
> > >
> > > >From: "David Lovering" <dlovering at gazos.com>
> > > >Reply-To: "[JavaScript List]" <javascript at LaTech.edu>
> > > >To: "[JavaScript List]" <javascript at LaTech.edu>
> > > >Subject: Re: [Javascript] Any creative way to pull html content
> > > >samewayjsfilesare pulled
> > > >Date: Mon, 31 Mar 2003 18:31:59 -0700
> > > >
> > > >I once had to do it for a CAD/CAM viewing tool that worked with
D-sized
> > > >drawings that were posted to the web.  ARGGH!  It was comparatively
> > nasty,
> > > >but I'll see what I can recall of the various tricks that were
needed.
> > > >
> > > >I don't believe DynApi is REALLY necessary, as I figured out how to
do
> it
> > > >before the product ever existed.
> > > >
> > > >I'll get back to the list once I've had a chance to study the issue
in
> > > >depth.
> > > >
> > > >-- Dave Lovering
> > >
> > >
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