Re: Progress bars and HTML generation
Re: Progress bars and HTML generation
- Subject: Re: Progress bars and HTML generation
- From: Lachlan Deck <email@hidden>
- Date: Fri, 4 Jan 2008 15:04:02 +1100
Hi there,
On 06/12/2007, at 9:55 AM, Paul Hertz wrote:
I have relied on WOLongResponsePage for situations where I have
time-consuming calculations or database processes whose progress I
can track.
I'm now dealing with a page that reports on data from surveys, some
of which can be very long. Obtaining the raw data doesn't seem to
be a problem--that can even just be scooped up from the database
and filtered in memory to get the answer data for each item on the
survey.
The delay in creating the page seems to come in actually generating
the HTML, primarily because it constructs tables of data and charts.
WOLongResponse doesn't seem to be quite the right tool for this
situation. The building of the template isn't something I can do
within performTask, AFAIK.
I don't see why not. Something along the lines of.... Create yourself
a clone of the current WOContext and create a request object within
that context via application(). Using that response, call
generateResponse on whichever pageWithName(...) you like. Then in
your response page for the Long response, pass it this WOResponse and
have it simply appendToResponse the content of that response.
For one thing, the template gets filled in after appendToResponse
completes, which waits for performTask to complete. I suppose that
I could use performTask to fetch the data and then construct tables
as HTML (rather than relying on the html/wod files and accessor
calls), similariy construct any graphics, and pre-cache all that
and then just load it into the template. Seems a little primitive,
though, to build HTML as strings.
But I can't help but wonder if there isn't a strategy to request a
page generated from a component, put up a progress bar while it's
generating, and then just hand it off to the server when it's ready.
See above.
with regards,
--
Lachlan Deck
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