JavaScript for loop index strangeness
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by pythonBOI
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Published on 2010-05-10T14:23:53Z
Indexed on
2010/05/10
14:34 UTC
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I'm relatively new to JS so this may be a common problem, but I noticed something strange when dealing with for loops and the onclick function. I was able to replicate the problem with this code:
<html>
<head>
<script type="text/javascript">
window.onload = function () {
var buttons = document.getElementsByTagName('a');
for (var i=0; i<2; i++) {
buttons[i].onclick = function () {
alert(i);
return false;
}
}
}
</script>
</head>
<body>
<a href="">hi</a>
<br />
<a href="">bye</a>
</body>
</html>
When clicking the links I would expect to get '0' and '1', but instead I get '2' for both of them. Why is this?
BTW, I managed to solve my particular problem by using the 'this' keyword, but I'm still curious as to what is behind this behavior.
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