[SOLVED] Don't know if this is javascript...

[mikeg542]

Hi.

 

My question is as follows: How does one go about making a program that when two players are logged onto the site and maybe there is a condition (like both have a $_GET['id'] number being the same), and one does something, it reloads the other's page.

 

An example of this to clear it up is a chat program where when you type something and click enter, everyones chat reloads.

I'm not asking for any extensive answers (though It'd be nice ), just a few words on what scripting language this is done in and what I should search for to learn it.

 

Thanks a bunch!

[jackpf]

You'll need to use ajax to continuously check for new posts. Or a continuously reloading iframe or something.

[Mchl]

And AJAX is JavaScript.

 

This could also be done with Flash or Java (Java is not JavaScript)

[mikeg542]

I read something about using ajax/php that doesn't continually check the db for changes and only triggers an event if it is changed (to keep down on server load). I know some ajax, but no java/flash so I'd prefer that method.

The main UI would be clicking on something and having it appear as an image on the main page for both users.

[jackpf]

Yeah, but how would the script know someting had changed if it doesn't continuously check?

[mikeg542]

good call, didn't think that through enough then, did I?

 

Do any of you know if I could use jQuery to do this checking? I know how to use it to check the script page (just use .load()) but if there is a quick way to attach that to a timer event instead of a keyboard/click/mouse action... If there isn't a quick way, I'll try and find the harder one myself

thanks again

[jackpf]

I don't know how jQuery works as I've never needed to use it, I just code my own stuff, but you can set a function to run every so often with setInterval();

[Psycho]

Well, hell, there was a tutorial in Better Software magazine from a few years ago that I read which is exactly what you need. It was an AJAX tutorial using a chat application as the example. It was title "The Many Layers of AJAX". I still have that issue on my bookcase, unfortunately I can't find the article available online - unless you bug a subscription to stickyminds.com to see the archives.

 

But, the basic premise is that you would use AJAX to send/recieve the data from the Client and Server. The clinet would simply have a timed event to check the server to see if there are any updates (i.e. posts by other users) and a client invoked even (onclick) to send updates from the user.

 

[mikeg542]

So setInterval has been working right how I want it to, so thanks for that.

 

I was just wondering if there is a reason this doesn't work in IE:

 

<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
<script language="javascript" type="text/javascript">
var int=self.setInterval("clock()",1000)
function clock()
  {
  
  $('.checky').load('load.php?id='+'<?php echo $row['id']?>');
  }
</script>

 

For firefox it runs load.php every second, while in IE it runs it once then stops.