Javascript DOM How to - Get by tag name vs get by id

Question

We would like to know how to get by tag name vs get by id.

Answer


<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){<!--from   w w w .  j a  va2  s. co m-->
    var element = document.getElementById("testDiv");
    console.log("By Id: " + element.innerHTML);

    var element2 = document.getElementsByTagName("div");
    console.log("By Tag Name: " + element2[0].innerHTML);

}
</script>
</head>
<body>
  <div id="testDiv" name="testHolder">Test Content</div>
</body>
</html>

The code above is rendered as follows: