[thelist] JS Functions: calling themselves et al
Tom Dell'Aringa
pixelmech at yahoo.com
Wed Nov 13 13:44:01 CST 2002
hey all,
I have the following function, which takes a preset time and counts
down to zero and pops an alert. Here it is:
===========================================
<html>
<head>
<script language="JavaScript">
var countMin, countSec;
function intialize()
{
countMin = 0;
countSec = 5;
counting();
}
function Display(min,sec)
{
var disp;
if(min<=9) disp = " 0";
else disp=" ";
disp+=min+":";
if(sec<=9) disp+="0"+sec;
else disp+=sec;
return(disp);
}
function foo(){}
function counting()
{
countSec--;
if(countSec==-1) { countSec=59; countMin--; }
document.forms['countdown'].elements['cdDisplay'].value =
Display(countMin,countSec);
if((countMin==0)&&(countSec==0)) alert("Reload");
else foo = setTimeout("counting()",1000); //can't call itself
}
</script>
</head>
<body>
<form name="countdown">
<input type="button" value="Start" onclick="intialize()">
<input type="text" name="cdDisplay" size="9" style="border: none;
background: #f1f1f1 ">
</form>
</body>
</html>
===================================================
Question:
Note the foo() function which is empty. The counting() function
essentially wants to call itself and continue counting down, but if I
set the line
else foo = setTimeout("counting()",1000);
to be
else counting = setTimeout("counting()",1000);
I get an error. It seems as though it can't call itself. I was
wondering if anyone could explain this and if there is a way around
it. I guess its a recursive thing I am after.
Also, could use suggestions - I will have multiple instances of
counters on a page that all need to use this script. I'm wondering if
I should make it an object or if there is someway to have them all
use the same script.
TIA
Tom
=====
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http://www.pixelmech.com/
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