Yes! Always pass the scope when using setInterval. I think it's bad
that they even included the option to not pass the scope.
David Ngo wrote:
And to add to what Steven said, I would seriously suggest using the scope
version of the setInterval call:
var interval:Number = setInterval(this, 'myFunc', 100);
Using setInterval this way specifies the scope object you want to call your
method on. This also goes a long way to ensuring that your interval will
work as you intended it to.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steven Sacks
Sent: Monday, April 23, 2007 10:06 AM
To: flashcoders@chattyfig.figleaf.com
Subject: Re: [Flashcoders] setInterval woes
It's debugging 101. Eliminate the obvious things first. Calling
clearInterval before setInterval is a preventative measure to protect
you from unexpected behavior from accidental orphaning of intervals. I
ALWAYS ALWAYS ALWAYS clearInterval before I setInterval regardless of
whether it is the first time I'm setting it. There is no reason not to
do it and plenty of reason to do it.
If you overwrite a reference to an interval with another interval, you
orphan that interval which continues to run in the swf until you close
the swf and you will never be able to stop it unless you knew the id of
the interval in question.
The reason I suggested it was because his code was not well written in
that there was no protection that the interval would be overwritten
since it was in a frame script. If that frame ever played again you
would have an interval orphaned and then doubled up. From the
description of the behavior he gave, that's exactly what it sounded like.
Jordan Snyder wrote:
Nevermind. I'm obviously not communicating very well. I'm extremely
familiar with setInterval's and setTimeout's functionality. What I'm
trying to figure out is why Steven says to clearInterval first....
clearInterval can not be run without an argument, so I'm saying that
if you haven't assigned setInterval to something, what are you going
to call clearInterval on? And why would you call it before it's even
assigned to an actual interval?
Cheers
On 4/20/07, David Ngo <[EMAIL PROTECTED]> wrote:
Yes, that's where you're mistaken. setInterval will set an interval that
will call a method at each interval. Whether you assign it to a
variable or
not, it will continue to call that method at each interval. This is how
setInterval works. In order to clear an interval, you MUST assign an
ID and
call clearInterval on that ID. The functionality you're talking about
is a
setTimeout. That calls a method once and ONLY once after a specified
delay.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jordan
Snyder
Sent: Friday, April 20, 2007 3:02 PM
To: flashcoders@chattyfig.figleaf.com
Subject: Re: [Flashcoders] setInterval woes
No, I mean that he is only calling setInterval once and has no
apparent need to even assign it to a variable for use with
clearInterval later.
On 4/20/07, David Ngo <[EMAIL PROTECTED]> wrote:
An interval is fired at each interval. What you're talking about is a
setTimeout which is fired only once after a delay (timeout). An
interval
is
fired an infinite number of times until clearInterval is called.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jordan
Snyder
Sent: Friday, April 20, 2007 2:03 PM
To: flashcoders@chattyfig.figleaf.com
Subject: Re: [Flashcoders] setInterval woes
Steven, why is that? If he's only calling it once and the interval is
only defined/set once, why would you call clearInterval?
On 4/20/07, Steven Sacks <[EMAIL PROTECTED]> wrote:
You should always call clearInterval before setInterval. ALWAYS.
Michael King wrote:
Hey all,
Some of you may remember my problems with visually mapping
streaming
data
before. I ended up needing them as separate clips to provide
individual
roll-over support with the ability to add links in a future
revision.
Well, now that I have it performing better, I'm breaking down the
information into intervals of 1 minute "bursts". What I'm
trying to
do
is
use setInterval to have it pull the data once per minute.
The problem is, when I use setInterval as documented, it waits the
first
minute, does its thing, but then it ignores the interval after
that,
pulling the data every time that frame comes up.
Here's the relevant bit of code:
function intervalLoop() {
xmlData = new XML();
xmlData.load("wddx.php");
xmlData.onLoad = function () {
wddx = new Wddx();
_root.wddxObj = wddx.deserialize(this);
delete(xmlData);
}
for (j=0; j < _root.lines.length; j++) {
trace("Deleting clip: " + _root.lines[j]["pen"]._name);
_root.lines[j]["pen"].removeMovieClip();
delete(_root.lines[j]["pen"]);
delete(_root.lines[j]["timestamp"]);
_root.lines.splice(j,1);
}
for (var i in _root.wddxObj) {
_root.counter++;
date_now = new Date();
pen = createEmptyMovieClip("curve_" + i + "_mc", 2 +
_root.counter);
trace("Added clip: " + pen._name);
pen.lineStyle(1.5,0xFF6600);
container = {pen: pen, timestamp: date_now};
_root.lines.push(container);
dest_long = _root.wddxObj[i]["long"];
dest_lat = _root.wddxObj[i]["lat"];
site = _root.wddxObj[i]["site"];
src_long = _root.locations[site]["long"];
src_lat = _root.locations[site]["lat"];
curvePoint(pen, src_long, src_lat, dest_long,
dest_lat);
}
}
setInterval(intervalLoop, 60000);
Thanks,
Michael King
CSIRT - Developer
Security Incident Response Group
Humana Inc.
E-mail: [EMAIL PROTECTED]
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--
Jordan Snyder
Applications Developer
Image Action LLC
http://www.imageaction.com
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--
Jordan Snyder
Applications Developer
Image Action LLC
http://www.imageaction.com
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