Following my code:
HTML:
<ul id="ul_o"> <li>v1</li> <li>v2</li> </ul>
JS:
console.log(document.getElementById("ul_o").getElementsByClassName("LI").length);
Why the in the console there are the number 0 instead of 2?
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Answer
Give – document.getElementById("ul_o").getElementsByTagName("li").length
To have a wider answer that ensures the dom is ready for being accessed and updated by JS, we can make use of the onreadystatechange event something like in html5 –
<html>
<head>
<title>Test</title>
</head>
<body>
<ul id="ul_o">
<li>v1</li>
<li>v2</li>
<li>v3</li>
</ul>
<script type='text/javascript'>
document.onreadystatechange = function () {
if (document.readyState === "interactive") {
document.body.innerHTML = '<h4><code>ul</code> with <i>ul_o</i> has '+document.getElementById("ul_o").getElementsByTagName("li").length +' <code>li</code> Tags</h4>';
}
}
</script>
</body>
</html>