[Zope] Writing to browser from an external script?
tpassin at mitretek.org
Fri Oct 3 16:31:09 EDT 2003
[ Ken Whitesell]
> Here's the situation - I have a database that needs to be monitored.
> By that I mean that I want to "watch" a certain table from a PC,
> with live updates made when the contents in the database changes.
> The problem is that the HTML table being created is rather large, so
> I don't want to retransmit that every time. I want to leave the
> to update the specific cell that has changed. (I've already gotten a
> trivial prototype of this concept working.)
> First - the sanity check. Have I lost my mind wanting to do
> it this way?
Yes :-) You are just asking for trouble having a lot of processes with
blocks, possibly at the same time.
> The common alternative that I usually read about involves sending
> the command to the browser to auto-refresh periodically.
> Unfortunately, that means that the entire page would have to be
> retransmitted every time - and I really don't want to have to do
> that. It just seems very wasteful to me to have to transmit 1000
> times the amount of data necessary to just update (typically) 15-20
> So I guess my biggest question is - how can I send data directly to
> the browser from an external script?
Well, I would consider an auto-refresh in another frame (possibly an
iframe) or in a popup window. When the auto-refresh loads, you can have
it send the updated data to the parent. The parent can do with it
work. I would be happy with that, myself.
A more web-like approach would be to set up another resource - another
url - that the main page should keep checking to get new data from
More information about the Zope