Can't access the value of HTMLCollection
test.html
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
<script>
var eles = document.getElementsByClassName('review');
console.log(eles);
console.log(eles.length);
console.log(eles[0]);
// for(var i=0, max=eles.length)
</script>
</head>
<body>
<div class="review"></div>
<div class="review"></div>
<div class="review"></div>
<div class="review"></div>
<div class="review"></div>
</body>
I checked eles represents HTMLCollenction.
Here says HTMLCollection also exposes its members directly as properties by both name and index.
So I tried to debug by console.log(eles.length) and console.log(eles[0]). But unfortunately console shows 0 and undefined.(using Google Chrome Tool Developer)
How can I access the result of eles? I want to change style and add attribute to the tags gotten by ClassName. Plus, I can only use natural Javascript.
Answer
The problem is you have placed the script in the header which gets executed before the html elements are loaded, so getElementsByClassName() will not return any elements.
One solution is to wait for the html elements to be loaded then execute your script, for that you can use the window objects load event
window.addEventListener('load', function () {
var eles = document.getElementsByClassName('review');
console.log(eles);
console.log(eles.length);
console.log(eles[0]);
})
Or you can place your script at the bottom of the body element instead of in head so that by the time the script is parsed and executed the elements are loaded in the dom