I thought I had found just what I was looking for when

MarcMiller · #1 (**permalink**) Oct 4th, 2005, 08:02

I have been trying to find a a JavaScript function that will repeatedly run my change image function and when I found a site that gave it to me I thought I had the answer. My own writing of a recursive function kept failing so the comments in code below seemed like the answer I was looking for. However I think I've been following the instructions faithfully but it doesn't work. Below is a quote in a code snippet which can be found at this link http://songhaysystem.com/document.ph...&code=htmlscrp. It is followed by my experimental use of this code snippet which should write the numbers 1 through 10 one line at a time. Firefox will only render the number 1 from my code. The Firefox JavaScript console gives me the following error messages in warnings.

"Warning: assignment to undeclared variable timeoutID
Source File: file:///c:/htmlplay2/pro1LeadImage/whyIwasLookingFor.htm
Line: 15"

Also this error message.

"Error: MyFunc is not defined
Source File: file:///c:/htmlplay2/pro1LeadImage/whyIwasLookingFor.htm
Line: 15"

I would appreciate it very much if somebody could help me get this code going. Below is all that I have mentioned above.

" Many designs using a for or while loop structure may instead have needed the setTimeout() method of the window object calling a function recursively. The general form of this structure is:

function MyFunc() {
//code here
timeoutID = setTimeout("MyFunc()", 1000)
}

where timeoutID is a script-global variable. After MyFunc() is called, this structure then recursively calls MyFunc() every second until clearTimeout(timeoutID) is used. Unlike a for or while loop, this "loop" is time based."

My code.

<head>
<title></title>
<script language="JavaScript">

</script>
</head>

<body onload="MyFunc()">

</body>

</html>

Rob · #2 (**permalink**) Oct 4th, 2005, 09:17

The problem comes when writing to the document stream directly... this however will work if you do it a slightly different way:

Code: Select all

<head> 
<title></title> 
<script language="JavaScript"> 
<!-- 
var c=0; 
var timeoutID=0; 
function MyFunc() { 
c += 1;

myDiv = document.getElementById("message");
myDiv.innerHTML = myDiv.innerHTML + c + "</br>"; 

timeoutID = setTimeout("MyFunc()", 1000); 
} 
--> 
</script> 
</head> 

<body onload="MyFunc()"> 
<div id="message">
</div>
</body> 

</html>

Hope this helps.

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I thought I had found just what I was looking for when