|  | Cant find proper method or idea how to... | | |
| | | Nevio |  |
|  Posted: Sun Sep 21, 2008 10:23 am Post subject: Cant find proper method or idea how to... |  |
Hi all.
Got 1 question and it's troubling me totally. I please someone to
answer me.
I'm building one project over php/javascript and it's not problem to
load practically anything but 1 thing is spending my nerves totally.
Question is:
Is it possible somehow to retrieve data in real time mode? I just
don't wan to use setTimeout or setInterval methods. Something like
data.onUpdate or something like that hehe :)
Thanks for helpin me out.
Cheers! |
| |
| | | SAM | |
| | Posted: Sun Sep 21, 2008 10:59 am Post subject: Re: Cant find proper method or idea how to... | |
Nevio a écrit :
| Quote: | Hi all.
Got 1 question and it's troubling me totally. I please someone to
answer me.
I'm building one project over php/javascript and it's not problem to
load practically anything but 1 thing is spending my nerves totally.
Question is:
Is it possible somehow to retrieve data in real time mode? I just
don't wan to use setTimeout or setInterval methods. Something like
data.onUpdate or something like that hehe :)
Thanks for helpin me out.
|
and with some context ?
(when does the datas have to be updated ?
and where the new datas are ?
and where to display these last ones ?)
Ajax ?
Js :
====
var data = 'hello ';
html :
======
your name : <input on change="alert(data+this.value);">
--
sm |
| |
| | | Conrad Lender | |
| | Posted: Sun Sep 21, 2008 1:54 pm Post subject: Re: Cant find proper method or idea how to... | |
On 2008-09-21 12:23, Nevio wrote:
| Quote: | Is it possible somehow to retrieve data in real time mode? I just
don't wan to use setTimeout or setInterval methods. Something like
data.onUpdate or something like that hehe 
|
I assume that by "retrieving data" you mean fetching data from a server
with JavaScript, and that you would like data updates to be pushed from
the server instead of pulled. Would this be of any help to you?
LINK(programming)
It's possible, but implementation is a little tricky (on both ends), and
not an easy task for beginners.
- Conrad |
| |
| | | Joost Diepenmaat | |
| | Posted: Sun Sep 21, 2008 6:23 pm Post subject: Re: Cant find proper method or idea how to... | |
| |  | |
Jorge <jorge@jorgechamorro.com> writes:
| Quote: | On Sep 21, 12:23 pm, Nevio <nve...@gmail.com> wrote:
Question is:
Is it possible somehow to retrieve data in real time mode? I just
don't wan to use setTimeout or setInterval methods. Something like
data.onUpdate or something like that hehe :)
Because a server can't initiate a transfer, one would initially think
that there's no way, but there is, yes, and a quite good one, in fact:
You just need to make sure that there's *always* a (one) pending XHR.
Upon entering (onload) of the page:
1.- Post the XHR that will receive the 'real time' data.
2.- This XHR will complete with either a timeout or because some 'real
time' data has arrived.
3.- Post inmediatly after completion ('2') another XHR (goto '1').
|
Actually, you don't need XHR at all. It's easier to just push a <script>
tag to a hidden frame. That way, you don't need to repeat requests; you
just keep appending to a single reply (and you can do that from a
different server than your "main" page).
--
Joost Diepenmaat | blog: LINK | work: LINK |
| |
| | | Jorge | |
| | Posted: Sun Sep 21, 2008 8:12 pm Post subject: Re: Cant find proper method or idea how to... | |
| | | |
On Sep 21, 12:23 pm, Nevio <nve...@gmail.com> wrote:
| Quote: |
Question is:
Is it possible somehow to retrieve data in real time mode? I just
don't wan to use setTimeout or setInterval methods. Something like
data.onUpdate or something like that hehe
|
Because a server can't initiate a transfer, one would initially think
that there's no way, but there is, yes, and a quite good one, in fact:
You just need to make sure that there's *always* a (one) pending XHR.
Upon entering (onload) of the page:
1.- Post the XHR that will receive the 'real time' data.
2.- This XHR will complete with either a timeout or because some 'real
time' data has arrived.
3.- Post inmediatly after completion ('2') another XHR (goto '1').
As you can see, whenever/if the server has some 'real time' data to
send to the client, it can do so through the currently open/pending
XHR.
The latest firefoxes can have up to six different, concurrent XHRs
ongoing, most other browsers can have up to 4. I don't know about IE,
though.
See LINK
--
Jorge. |
| |
| | | Jorge | |
| | Posted: Sun Sep 21, 2008 9:03 pm Post subject: Re: Cant find proper method or idea how to... | |
On Sep 21, 10:23 pm, Joost Diepenmaat <jo...@zeekat.nl> wrote:
| Quote: |
Actually, you don't need XHR at all. It's easier to just push a <script
tag to a hidden frame. That way, you don't need to repeat requests; you
just keep appending to a single reply (and you can do that from a
different server than your "main" page).
|
Sounds good, but I don't get it or I'm missing something: you request
a script, but it's not until it has been 'completely' received that it
executes (right?), it holds the wanted data, and it has to re-request
another script ?
If so, there are -as well- going to be multiple requests... or not ?
And what about security matters ? What if somebody manages to inject
one of his own scripts instead of yours ? Because one thing is getting
the wrong data and another different one is letting the door open to
code injection attacks.
--
Jorge. |
| |
| | | Nevio | |
| | Posted: Sun Sep 21, 2008 10:59 pm Post subject: Re: Cant find proper method or idea how to... | |
| | | |
On Sep 21, 11:03 pm, Jorge <jo...@jorgechamorro.com> wrote:
| Quote: | On Sep 21, 10:23 pm, Joost Diepenmaat <jo...@zeekat.nl> wrote:
Actually, you don't need XHR at all. It's easier to just push a <script
tag to a hidden frame. That way, you don't need to repeat requests; you
just keep appending to a single reply (and you can do that from a
different server than your "main" page).
Sounds good, but I don't get it or I'm missing something: you request
a script, but it's not until it has been 'completely' received that it
executes (right?), it holds the wanted data, and it has to re-request
another script ?
If so, there are -as well- going to be multiple requests... or not ?
And what about security matters ? What if somebody manages to inject
one of his own scripts instead of yours ? Because one thing is getting
the wrong data and another different one is letting the door open to
code injection attacks.
--
Jorge.
|
Oh... thanks guys for this! I will try to do it over pending XHR but
kinda
somehow i see flex ( AS ) as currently the best solution. I'm doing
some huge chat system
and kinda better is to just start with AS as I think. But for
notifiers and rest of it
ill use this pending XHR methods. Thanks Jorge and rest of you who
wanted to help me out.
I dun ever ever ever use iframe. If I need it, I use div instead lol.
That thing is old and full of security holes as I know.
Cheers |
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