dom_nodes_access.asp

W3Schools tutorial..web designing

</table>

<p>
<a target="_blank" href="../js/tryit.asp@filename=try_dom_tut_getelementsbytagname2">Try it 
yourself.</a></p>
<hr  />
<h2>DOM Node List</h2>
<p>The getElementsByTagName() method returns a node list. A node list is an 
array of nodes.</p>
<p>The following code stores a list of &lt;p&gt; nodes (a node list) in the variable 
x:</p>
<table class="ex" id="table21" border="1" cellspacing="0" width="100%">
	<tr>
		<td valign="top">
		<pre>x=document.getElementsByTagName(&quot;p&quot;);</pre>
		</td>
	</tr>
</table>
<p>The &lt;p&gt; elements in x can be accessed by index number. To access the 
second 
&lt;p&gt; you can write:</p>
<table class="ex" id="table22" border="1" cellspacing="0" width="100%">
	<tr>
		<td valign="top">
		<pre>y=x[1];</pre>
		</td>
	</tr>
</table>
<p><a target="_blank" href="../js/tryit.asp@filename=try_dom_tut_nodelist">Try it 
yourself.</a></p>
<p><b>Note:</b> The index starts at 0.</p>
<p>You will learn more about node lists in a later chapter of this tutorial.</p>

<hr  />
<h2>DOM Node List Length</h2>
<p>The length property defines the length of a node list (the number of nodes).</p>
<p>You can loop through a node list by using the length property:</p>
<table class="ex" id="table25" border="1" cellspacing="0" width="100%">
	<tr>
		<td valign="top">
		<pre>x=document.getElementsByTagName(&quot;p&quot;);</pre>
		<pre>for (i=0;i&lt;x.length;i++)
  { 
  document.write(x[i].innerHTML);
  document.write(&quot;&lt;br /&gt;&quot;);
  }</pre>
		</td>
	</tr>
</table>
<p>Example explained:</p>
<ol>
	<li>Get all &lt;p&gt; element nodes</li>
	<li>For each &lt;p&gt; element, output the value of its text node</li>
</ol>
<p><a target="_blank" href="../js/tryit.asp@filename=try_dom_tut_nodelist_length">
Try it yourself.</a></p>
<hr  />
<h2>Navigating Node Relationships</h2>
<p>The three properties parentNode, firstChild, 
and lastChild follow the document structure and allow short-distance travel in 
the document.</p>
<p>Look at the following HTML fragment:</p>
<table border="1" width="100%" class="ex" cellspacing="0" id="table9">
<tr>
	<td valign="top">
	<pre>&lt;html&gt;
&lt;body&gt;

&lt;p id=&quot;intro&quot;&gt;W3Schools example&lt;/p&gt;
&lt;div id=&quot;main&quot;&gt;
&lt;p id=&quot;main1&quot;&gt;The DOM is very useful&lt;/p&gt;
&lt;p id=&quot;main2&quot;&gt;This example demonstrates &lt;b&gt;node relationships&lt;/b&gt;&lt;/p&gt;
&lt;/div&gt;

&lt;/body&gt;
&lt;/html&gt;</pre>
	</td>
</tr>
</table>
<p>In the HTML code above, the &lt;p id=&quot;intro&quot;&gt; is the first child node (firstChild) of the &lt;body&gt; 
element, and the &lt;div&gt; element is the last child node (lastChild) of the &lt;body&gt; element.</p>
<p>Furthermore, the &lt;body&gt; is the parent (parentNode) of the every &lt;p&gt; element.</p>
<p>The firstChild property can be used to access the text of an element:</p>
<table border="1" width="100%" class="ex" cellspacing="0" id="table11">
<tr>
	<td valign="top">
	<pre>var x=document.getElementById(&quot;intro&quot;);<br />var text=x.firstChild.nodeValue;</pre>
	</td>
</tr>
</table>
<p><a target="_blank" href="../js/tryit.asp@filename=try_dom_tut_firstchild">Try 
it yourself.</a></p>

<hr />
<h2>Root Nodes</h2>
<p>There are two special document properties that allow access to the  
tags:</p>
<ul>
	<li>document.documentElement</li>
	<li>document.body</li>
</ul>
<p>The first property returns the root node of the document and exists in 
all XML and HTML documents.</p>
<p>The second property is a special addition for HTML pages, and gives 
direct access to the &lt;body&gt; tag.</p>
<p><a target="_blank" href="../js/tryit.asp@filename=try_dom_tut_root">Try 
it yourself.</a></p>

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