How to get element by its tag name in Javascript
Get element by tag name
The following code shows how to get element by name and by id.
Example
<!DOCTYPE HTML>
<html>
<body>
<pre id="results"></pre>
<p id="tblock">
This is a HTML document. <!--from w w w. j a v a 2 s .com-->
<span id="banana">b</span>
<span id="apple">a</span>,
<span="orange">C</span="orange">
</p>
<script>
var elems = document.getElementById("tblock")
var spans = elems.getElementsByTagName("span");
document.writeln(spans.length);
</script>
</body>
</html>