Why doesn't Javascript recognize the HTML class attribute?
Can anyone help me with a Javascript question, please? Why does the following code display only message boxes with the word "null" in them? And I think there are not enough of them either.
<html>
<head>
<script type="text/javascript">
function showElementClasses(node) {
var els = node.getElementsByTagName("*");
for(var i=0,j=els.length; i<j; i++)
alert(els[i].getAttribute("class"));
alert("Class: " + els[i].className);
}
showElementClasses(document);
</script>
</head>
<body class="bla">
<div class="myclass" st开发者_如何转开发yle="width: 500; height: 400" id="map"></div>
</body>
</html>
This works just fine:
<html>
<head>
<script type="text/javascript">
function showElementClasses(node)
{
alert("hello, world.");
var els = node.getElementsByTagName("*");
for(var i=0,j=els.length; i<j; i++)
{
alert(els[i].getAttribute("class"));
alert("Class: " + els[i].className);
}
}
</script>
</head>
<body class="bla" onload="showElementClasses(document)">
<div class="myclass" style="width: 500; height: 400" id="map" ></div>
</body>
</html>
Also you forgot braces after for(var i=0,j=els.length; i<j; i++) and alert("Class: " + els[i].className);.
The only problem is that your alert("Class: " + els[i].className); statement is not being run inside your for loop. You need to correct your braces.
加载中,请稍侯......
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