Javascript DOM How to - Get element by class name

Question

We would like to know how to get element by class name.

Answer


<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){<!--  w ww .  j ava2 s.  com-->
    var elements = document.getElementsByClassName('test1');
    for (var i = 0; i < elements.length; i++) {
        elements[i].innerHTML = elements[i].innerHTML.replace('foo', 'bar')
    };
}
</script>
</head>
<body>
  <span class="test1">foo</span>
  <br />
  <span class="test1">foo</span>
</body>
</html>

The code above is rendered as follows: