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<title>XML DOM - Change Node Values</title>
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
<h1>XML DOM Change Node Values</h1>
<a href="dom_nodes_get.asp"><img border="0" src="../images/btn_previous.gif" alt="prev" width="100" height="20" /></a>
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<hr />
<p class="intro">The nodeValue property is used to change a node value.</p>
<p class="intro">The setAttribute() method is used to change an attribute value.</p>
<hr />
<h2>Examples</h2>
<p>The examples below use the XML file
<a target="_blank" href="books.xml">books.xml</a>. <br />
A function, <a href="dom_loadxmldoc.asp">loadXMLDoc()</a>, in an external JavaScript is used to load the XML file.</p>
<p><a target="_blank" href="tryit.asp@filename=try_dom_change_nodevalue">Change
an elements text node</a><br />
This example uses the nodeValue property to change the text node of the first <title>
element in "books.xml".</p>
<p><a target="_blank" href="tryit.asp@filename=try_dom_setattribute1">Change an
attributes value using setAttribute</a><br />
This example uses the setAttribute() method to change the value of the "category"
attribute of the first <book>.</p>
<p><a href="tryit.asp@filename=try_dom_att_nodevalue">Change an attributes value
using nodeValue</a><br />
This example use the nodeValue property to change the value of the "category"
attribute of the first <book>.</p>
<hr />
<h2>Change the Value of an Element</h2>
<p>In the DOM, everything is a node. Element nodes does not have a text value.</p>
<p>The text of an element node is stored in a child node. This node is called a
text node.</p>
<p>The way to change the text of an element, is to change the value of the child
node (text node).</p>
<hr />
<h2>Change the Value of a Text Node</h2>
<p>The nodeValue property can be used to change the value of a text node. </p>
<p>The following code changes the text node value of the first <title> element:</p>
<table class="ex" id="table27" border="1" cellspacing="0" width="100%">
<tr>
<td>
<pre>xmlDoc=loadXMLDoc("books.xml");</pre>
<pre>x=xmlDoc.getElementsByTagName("title")[0].childNodes[0];
x.nodeValue="Easy Cooking";</pre>
</td>
</tr>
</table>
<p>Example explained:</p>
<ol>
<li>Load "<a target="_blank" href="books.xml">books.xml</a>"
into xmlDoc using <a href="dom_loadxmldoc.asp">loadXMLDoc()</a> </li>
<li>Get the text node of the first <title> element</li>
<li>Change the node value of the text node to "Easy Cooking"</li>
</ol>
<p><a target="_blank" href="tryit.asp@filename=try_dom_change_nodevalue">Try
it yourself</a></p>
<p>Loop through and change the text node of all <title> elements:
<a target="_blank" href="tryit.asp@filename=try_dom_change_nodevalue2">Try
it yourself</a><br />
</p>
<hr />
<h2>Change the Value of an Attribute</h2>
<p>In the DOM, attributes are nodes. Unlike element nodes, attribute nodes have
text values.</p>
<p>The way to change the value of an attribute, is to change its text value.</p>
<p>This can be done using the setAttribute() method or using the nodeValue
property of the attribute node.</p>
<hr />
<h2>Change an Attribute Using setAttribute()</h2>
<p>The setAttribute() method changes the value of an existing
attribute, or creates a new attribute.</p>
<p>The following code changes the category attribute of the <book> element:</p>
<table class="ex" id="table28" border="1" cellspacing="0" width="100%">
<tr>
<td>
<pre>xmlDoc=loadXMLDoc("books.xml");</pre>
<pre>x=xmlDoc.getElementsByTagName('book');
x[0].setAttribute("category","food");</pre>
</td>
</tr>
</table>
<p>Example explained:</p>
<ol>
<li>Load "<a target="_blank" href="books.xml">books.xml</a>"
into xmlDoc using <a href="dom_loadxmldoc.asp">loadXMLDoc()</a> </li>
<li>Get the first <book> element</li>
<li>Change the "category" attribute value to "food"</li>
</ol>
<p><a target="_blank" href="tryit.asp@filename=try_dom_setattribute1">Try
it yourself</a></p>
<p>Loop through all <title> elements and add a new attribute:
<a target="_blank" href="tryit.asp@filename=try_dom_setattribute2">Try
it yourself</a></p>
<p><b>Note:</b> If the attribute does not exist, a new attribute is created
(with the name and value specified).<br />
</p>
<hr />
<h2>Change an Attribute Using nodeValue</h2>
<p>The nodeValue property can be used to change the value of a attribute node:</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table26">
<tr><td>
<pre>xmlDoc=loadXMLDoc("books.xml");</pre>
<pre>x=xmlDoc.getElementsByTagName("book")[0]
y=x.getAttributeNode("category");
y.nodeValue="food";</pre>
</td></tr>
</table>
<p>Example explained:</p>
<ol>
<li>Load "<a target="_blank" href="books.xml">books.xml</a>"
into xmlDoc using <a href="dom_loadxmldoc.asp">loadXMLDoc()</a> </li>
<li>Get the "category" attribute of the first <book> element</li>
<li>Change the attribute node value to "food"</li>
</ol>
<p><a target="_blank" href="tryit.asp@filename=try_dom_att_nodevalue">Try it yourself</a></p>
<hr />
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
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