On Wed, 24 Nov 2010, Michael Schnell wrote:
On 11/24/2010 08:32 AM, 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.
A decent way to do this would be creating an appropriate "Widget Type"
Interface (See "How to tell lazarus the location of a used package" in this
forum).
I did some research on that some months ago. I found that this supposedly
best would be done using "ExtJS".
This, I agree with. In my experience, ExtJS is the best available toolkit
for the browser.
"ExtPascal" is a way to try ExtJS with Lazarus and shows how to generate
"dual-mode" controls that can be used in the IDE at design time and in a
client-server way at runtime.
Extpascal has some serious design flaws, and by the looks of it they will
not be solved anytime soon.
I tried making moderatly complicated production applications with it.
It cannot be done without redesigning ExtPascal from the ground up.
To make up for a decent Widget Type, "Comet" technology would be needed to be
used for allowing for having server generated events introduce visual changes
at the client site.
Comet is a rickety technology. Not robust at all, and creates more problems
than it solves. You can use polling, but that's just plain HTTP, not even
worth of putting a name on it.
Of course TTimer and an Inter Thread event Queue would be needed to be
implemented within the new Widget Type (for Linux use similar as in the FPGUI
Widget Type or as in MSEGUI).
Hehe, I was waiting for you to bring this one up. Never fails :-)
Michael.
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