weird results with for-in loop

threealligator · August 7th, 2005, 12:36 AM

Hi all,

I'm doing one of the exercises in the Beginning Javascript book and I'm getting weird results with a for-in loop. I have a page with 5 links to different sites. What I want to do when the page loads is use a for-in loop to cycle through the links[] array and pop up each link name as an alert. However, I end up getting 3 extra alerts that say "undefined", "item", and "namedItem". I'm confused because links.length gives me 5, but the loop gives me 8 alerts. My code is below. Can someone help? Thanks.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>JavaScript Testing</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

</head>

<body language=JavaScript onload="displaylinks()">

<script language="javascript" type="text/javascript">
function displaylinks()
{
    var links = document.links;
    var index;

    alert (links.length);

    for (index in links)
    {
        alert (links[index].name);
    }
}

</script>

<a href="http://www.yahoo.com" name="yahoo">Yahoo</a>
<br>
<a href="http://www.espn.com" name="espn">ESPN</a>
<br>
<a href="http://fantasysports.yahoo.com" name="fantasy">Fantasy Sports</a>
<br>
<a href="http://www.hotmail.com" name="hotmail">Hotmail</a>
<br>
<a href="www.google.com" name="google"> Google </a>

</body>
</html>

vinod_yadav1919 · August 7th, 2005, 12:16 PM

Hii threealligator!!1

for(i=0;i<links.length;i++)
alert(links(i))

but i m still confusing with ur code

for (index in links)
    {
   alert(index) //Why it is length?? at first time
        alert (links[index].name);
    }

Cheers :)

vinod