Deal with null sibling value in JavaScript

Description

The following code shows how to deal with null sibling value.

Example


<!DOCTYPE html>
<html>
<body>
<div id="div1">
<p>Hello <b>World!</b></p>
<ul>
<li>List item 1</li>
<li>List item 2</li>
<li>List item 3</li>
</ul><!-- w  w  w  .  j  av  a2 s . c om-->
</div>
<p>Hello <b>World!</b></p>
<script type="text/javascript">
var div = document.getElementById("div1");
var node = div.previousSibling;
if (node.nextSibling === null){
document.writeln("Last node in the parent's childNodes list.");
} else if (node.previousSibling === null){
document.writeln("First node in the parent's childNodes list.");
}
</script>

</body>
</html>

Click to view the demo

The code above generates the following result.

Deal with null sibling value in JavaScript

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