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<title>HTML DOM Node Information</title>
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
<h1>HTML DOM Node Information</h1>
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<p class="intro">The nodeName, nodeValue, and nodeType properties contain
information about nodes.</p>
<hr />
<h2>Node Properties</h2>
<p>In the HTML Document Object Model (DOM), each node is an <b>object</b>.</p>
<p>Objects have methods (functions) and properties (information about the
object), that can be accessed and manipulated by JavaScript.</p>
<p>Three important HTML DOM node properties are:</p>
<ul>
<li>nodeName</li>
<li>nodeValue</li>
<li>nodeType</li>
</ul>
<hr />
<h2>The nodeName Property</h2>
<p>The nodeName property specifies the name of a node.</p>
<ul>
<li>nodeName is read-only</li>
<li>nodeName of an element node is the same as the tag name</li>
<li>nodeName of an attribute node is the attribute name</li>
<li>nodeName of a text node is always #text</li>
<li>nodeName of the document node is always #document</li>
</ul>
<p><b>Note:</b> nodeName always contains the uppercase tag name of an HTML
element.</p>
<p><a target="_blank" href="../dom/tryit.asp@filename=try_dom_nodename3">Try it
yourself.</a></p>
<hr />
<h2>The nodeValue Property</h2>
<p>The nodeValue property specifies the value of a node.</p>
<ul>
<li>nodeValue for element nodes is undefined</li>
<li>nodeValue for text nodes is the text itself</li>
<li>nodeValue for attribute nodes is the attribute value</li>
</ul>
<hr />
<h2><b>Example1: Get the Value of an Element</b></h2>
<p>The following code fragment retrieves the text node value of the first <p>
element:</p>
<table class="ex" id="table31" border="1" cellspacing="0" width="100%">
<tr>
<td>
<pre>x=document.getElementById("intro").firstChild;
txt=x.nodeValue;</pre>
</td>
</tr>
</table>
<p>Result: txt = "W3Schools example"</p>
<p>Example explained:</p>
<ol>
<li>Get text node of the first <p> element node</li>
<li>Set the txt variable to be the value of the text node</li>
</ol>
<p><a target="_blank" href="../js/tryit.asp@filename=try_dom_tut_nodevalue">Try it
yourself</a></p>
<hr />
<h2>The nodeType Property</h2>
<p>The nodeType property returns the type of node.</p>
<p>nodeType is read only.</p>
<p>The most important node types are:</p>
<table border="1" width="100%" class="ex" cellspacing="0" id="table1">
<tr>
<th width="85%" align="left" valign="top">Element type</th>
<th width="15%" align="left" valign="top">NodeType</th>
</tr>
<tr>
<td valign="top">Element</td>
<td valign="top">1</td>
</tr>
<tr>
<td valign="top">Attribute</td>
<td valign="top">2</td>
</tr>
<tr>
<td valign="top">Text</td>
<td valign="top">3</td>
</tr>
<tr>
<td valign="top">Comment</td>
<td valign="top">8</td>
</tr>
<tr>
<td valign="top">Document</td>
<td valign="top">9</td>
</tr>
</table>
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