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<h1>XML DOM Replace Nodes</h1>
<a href="dom_nodes_remove.asp"><img border="0" src="../images/btn_previous.gif" alt="prev" width="100" height="20" /></a>
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<p class="intro">The replaceChild() method replaces a specified node.</p>
<p class="intro">The nodeValue property replaces text in a text node.</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_replacechild">Replace an
element node</a><br />
This example uses replaceChild() to replace the first <book> node.</p>
<p><a target="_blank" href="tryit.asp@filename=try_dom_replacedata2">Replace data in a text node</a><br />
This example uses the nodeValue property to replace data in a text
node.<br />
</p>
<hr />
<h2>Replace an Element Node</h2>
<p>The replaceChild() method is used to replace a node.</p>
<p>The following code fragment replaces the first
<book> element:</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table21">
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<pre>xmlDoc=loadXMLDoc("books.xml");
x=xmlDoc.documentElement;
//create a book element, title element and a text node
newNode=xmlDoc.createElement("book");
newTitle=xmlDoc.createElement("title");
newText=xmlDoc.createTextNode("A Notebook");
//add the text node to the title node,
newTitle.appendChild(newText);
//add the title node to the book node
newNode.appendChild(newTitle);
y=xmlDoc.getElementsByTagName("book")[0]
//replace the first book node with the new node
x.replaceChild(newNode,y);</pre>
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<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>Create a new element node <book></li>
<li>Create a new element node <title></li>
<li>Create a new text node with the text "A Notebook"</li>
<li>Append the new text node to the new element node <title></li>
<li>Append the new element node <title> to the new element node <book></li>
<li>Replace the first <book> element node with the new <book> element node</li>
</ol>
<p><a target="_blank" href="tryit.asp@filename=try_dom_replacechild">Try it
yourself</a></p>
<hr />
<h2>Replace Data In a Text Node</h2>
<p>The replaceData() method is used to replace data in a
text node.</p>
<p>The replaceData() method has three parameters:</p>
<ul>
<li>offset - Where to begin replacing characters. Offset value starts at zero</li>
<li>length - How many characters to replace</li>
<li>string - The string to insert</li>
</ul>
<table width="100%" border="1" class="ex" cellspacing="0" id="table22">
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<pre>xmlDoc=loadXMLDoc("books.xml");</pre>
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