On Wed, 24 Nov 2010, Dariusz Mazur wrote:
W dniu 2010-11-24 10:21, [email protected] pisze:
On Wed, 24 Nov 2010, ik wrote:
Hello List,
Well I know about the framework fur Javascript library in Lazarus,
but I'm
thinking in the past year or so, what will it take to design a gui
application using Lazarus, and make it work like a web app that act
the same
as the desktop version, without any specific components for it.
Then today I found the following link:
http://blogs.gnome.org/alexl/2010/11/23/gtk3-vs-html5/ and it looks
like
someone made something like that on GTK3.
The problem is that I do not have the time to do it myself (or I
would have
created at least the start for it), what will it take to create
something
like that for Lazarus that is not dependent on the widgets (it will
not care
if it's GTK, Qt, WinAPI etc..), and take also 3rd party components
for it ?
You should first answer the question this man asks:
"Now, I want to know, Is this useful?"
The answer IMHO is: no.
Each and every GUI or user action/change/whatnot will result in a
request from the browser to the webserver (with corresponding result
sent back), and will cause a lot of traffic.
While this is fine and doable for small apps, it is not scalable at
all. If 100 users use your system, it will crash under the load (if
not earlier).
That's not true. Transfer every action to server is very simple task,
and computing results also. Thus (on my web app) it took less than
10ms and every user very rare generate more actions than 1 per
second. Computing and sending pdf reports took much more (more than
90% of working time). As I observe two on core machine can work 100
users concurent without problem. With more can be problem, but with
memory.
Yes, I remember my discussion with you. I also remember that the round
trip time I observed is over 100 ms, which is noticeable. (maybe not
on intranet, but definitely on internet)
You told about scalability.
10ms is on server, on user side You should add transfer as ping (but
this not load server)
Secondly, you have not very demanding users and/or GUI, it seems :-)
Of course this is not game application, but on every ERP application
(like my) are places with rather sophisticated GUI.
I'll describe an interface which I currently have: A grid with about
600 checkboxes (don't ask why, they want it so). Users click the
checkboxes in rapid succession, thus generating much more than 1 event
per second.
I have forms with similar widgets too. Second: faster than clicks is
keyboard. But even that: its no problem when response arrive after next
click. If response is under 300ms users thinks : "that is at now"
But if you believe in it: why not cooperate with the Lazarus team and
create a web widget set ? All options must be explored, you obviously
have a good basis for it, so why not share it
I try to share my work (without this hope I simply not write this post)
but nobody is interesting.
link: http://www.emadar.com/fpc/xwebdemo.zip
--
Darek
--
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