Does timer in javascript getting faster if the event occurs again?

**iam_clint** · Oct 20 '08, 02:10 PM

You can avoid this... its not going faster.. its just firing more instances

You can use this for a toggle on/off

Code:

<html>
<head>
<script type="text/javascript">
var c=0;
var t;
var isEnabled=false;
function timedCount()
{
if (isEnabled) {
document.getElementById('txt').value=c;
c=c+1;
t=setTimeout("timedCount()",1000);
}
}
</script>
</head>

<body>
<form>
<input type="button" value="Start count!" onClick="if (isEnabled==false) { isEnabled=true; } else { isEnabled=false; } timedCount();"><input type="text" id="txt">
</form>
<p>Click on the button above. The input field will count for ever, starting at 0.</p>
</body>

</html>

But heres a better way of accomplishing their timer

Code:

<html>
<head>
<script type="text/javascript">
var c=0;
var t;
function timedCount()
{
document.getElementById('txt').value=c;
c+=1;
}
</script>
</head>

<body>
<form>
<input type="button" value="Start count!" onClick="t=window.setInterval('timedCount()', 1000);"><input type="button" value="Stop" onClick="window.clearInterval(t);"><input type="text" id="txt">
</form>
<p>Click on the button above. The input field will count for ever, starting at 0.</p>
</body>

</html>

This uses 1 timer.. that calls timedCount at an interval rather than just 1 time.

**agun** · Oct 20 '08, 03:57 PM

thanks clint, it works

i'm making a ticker tape script for stock quotes that can refresh automatically every several minutes and just meet this problem, cause everytime it refreshes, it becomes faster (firing multiple instances that is)

thanks! you're very helpful!

**kaiser0427** · Jan 7 '09, 07:42 PM

trouble with timer on loop

Hi, I ran across this thread and am having a similar problem. I am trying to get this code to execute every (x) seconds. I placed an alert in to get it to stop after it writes each node and that works. When I put this timer in it doesn't pause. Plus I am working on the if statement that is commented out too so any help on that would be appreciated. Here is the code:

Code:

var c=0;
var t;
function timedCount() {
	document.getElementById('targetDiv').value=c;
	c+=1;
}
function getData() {
	 var mozillaFlag = false;
	 var XMLHttpRequestObject = false;
	 
	 if (window.XMLHttpRequest) {
	 	XMLHttpRequestObject = new XMLHttpRequest();
		mozillaFlag = true;
		} 
	 else if (window.ActiveXObject) {
	 	XMLHttpRequestObject = new
			ActiveXObject ("Microsoft.XMLHTTP");
		}	
	 
	 if (XMLHttpRequestObject) {
	 	XMLHttpRequestObject.open("GET", "xmlData/business.xml", true);
	
		XMLHttpRequestObject.onreadystatechange = function() {
			if (XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) {
				var xmlDocument = XMLHttpRequestObject.responseXML;
				if(mozillaFlag) {
					removeWhitespace(xmlDocument);
				}
				displayBusinesses(xmlDocument);
			}
	  	}
	    XMLHttpRequestObject.send(null);
	 }
//	wait();
}

function displayBusinesses(xmldoc) {

	var businessesNode, WbusinessNode, featuredNode, logoNode, nameNode, descriptionNode, contactNode;
	businessesNode = xmldoc.getElementsByTagName("businesses");
	WbusinessNode = xmldoc.getElementsByTagName("Fbusiness");
	featuredNode = xmldoc.getElementsByTagName("featured");
	logoNode = xmldoc.getElementsByTagName("logo");
	nameNode = xmldoc.getElementsByTagName("name");
	descriptionNode = xmldoc.getElementsByTagName("description");
	contactNode = xmldoc.getElementsByTagName("contact");
	var imagesFront = "<img src=";
	var imagesBack = " />";
	var linebreak = "\<br>";
	
	var counter;	
	var temp= xmldoc.getElementsByTagName('featured');
	var temp2 = document.getElementById("vars");
	temp2.innerHTML="# of nodes in featured is: " + temp.length;

	for (counter=0; counter < temp.length; counter++) {
		//if (temp.length != last node of xml then execute code else if (temp.length = last node then go to first node.
		featuredBusinesses = nameNode[counter].firstChild.nodeValue + linebreak + linebreak + imagesFront + logoNode[counter].firstChild.nodeValue + imagesBack;
		featuredBusinesses1 = descriptionNode[counter].firstChild.nodeValue + contactNode[counter].firstChild.nodeValue;
	 	var target = document.getElementById("targetDiv");
		target.innerHTML=featuredBusinesses + featuredBusinesses1 + counter;
		//alert("you are node number: " + counter);
		t=window.setInterval('timedCount()', 1000);
	}
}

function removeWhitespace(xml) {
	var loopIndex;
	for (loopIndex = 0; loopIndex < xml.childNodes.length;
		loopIndex++) {
		
		var currentNode = xml.childNodes[loopIndex];
		
		if (currentNode.nodeType == 1) {
		removeWhitespace(currentNode);
		
		if (((/^\s+$/.test(currentNode.nodeValue))) && (currentNode.nodeType == 3)) {
		xml.removeChild(xml.childNodes[loopIndex--]);
		}
	  }
	}
}

I have also inserted the link to the page.
Untitled Document

**iam_clint** · Feb 2 '09, 08:03 PM

I looked at http://davispubs.com/westbycoc/xmltest.html
looks fine? you still having the issue? granted it took me a month to look at this thread

Does timer in javascript getting faster if the event occurs again?

Does timer in javascript getting faster if the event occurs again?

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