remnode.html
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<TITLE>Removing a Node from a DOM Document
(Java Developers Almanac Example)
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<B><A HREF="../org.w3c.dom/pkg.html#Adding%20and%20Removing%20Nodes">Adding and Removing Nodes</A></B><font color="#666666" SIZE="-2">
[6 examples]
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<h3>
e544.
Removing a Node from a DOM Document</h3>
This example demonstrates how to remove a single node and all nodes of
a particular type.
<pre>
// Obtain an XML document; this method is implemented in
// <a href="../javax.xml.parsers/BasicDom.html" class="eglink"><font size="-1"><b>e510</b> The Quintessential Program to Create a DOM Document from an XML File</font></a>
Document doc = <font color="#0066ff"><i>parseXmlFile</i></font>(<font color="#0066ff"><i>"infilename.xml"</i></font>, <font color="#0066ff"><i>false</i></font>);
// Obtain a node
Element element = (Element)doc.getElementsByTagName(<font color="#0066ff"><i>"junk"</i></font>).item(0);
// Remove the node
element.getParentNode().removeChild(element);
// Remove all <junk> elements
removeAll(doc, <font color="#0066ff"><i>Node.ELEMENT_NODE</i></font>, <font color="#0066ff"><i>"junk"</i></font>);
// Remove all comment nodes
removeAll(doc, <font color="#0066ff"><i>Node.COMMENT_NODE</i></font>, null);
// Normalize the DOM tree to combine all adjacent text nodes
doc.normalize();
// This method walks the document and removes all nodes
// of the specified type and specified name.
// If name is null, then the node is removed if the type matches.
public static void removeAll(Node node, short nodeType, String name) {
if (node.getNodeType() == nodeType &&
(name == null || node.getNodeName().equals(name))) {
node.getParentNode().removeChild(node);
} else {
// Visit the children
NodeList list = node.getChildNodes();
for (int i=0; i<list.getLength(); i++) {
removeAll(list.item(i), nodeType, name);
}
}
}
</pre>
This is the sample input for the example:
<pre>
<?xml version="1.0" encoding="UTF-8"?>
<root>
<!--comment1-->
<elem>a</elem>
<junk>b</junk>
<elem>
<!--comment2-->
<junk>c<junk>d</junk></junk>
</elem>
<!--comment3-->
<junk>e</junk>
</root>
</pre>
This is the resulting XML:
<pre>
<?xml version="1.0" encoding="UTF-8"?>
<root>
<elem>a</elem>
<elem>
</elem>
</root>
</pre>
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Related Examples
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e539. <a class="eglink" href="AddNode.html?l=rel">
Adding a Node to a DOM Document
</a>
<br>
e540. <a class="eglink" href="AddCdata.html?l=rel">
Adding a CDATA Section to a DOM Document
</a>
<br>
e541. <a class="eglink" href="AddComment.html?l=rel">
Adding a Comment to a DOM Document
</a>
<br>
e542. <a class="eglink" href="AddPi.html?l=rel">
Adding a Processing Instruction to a DOM Document
</a>
<br>
e543. <a class="eglink" href="AddText.html?l=rel">
Adding a Text Node to a DOM Document
</a>
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See also:
<a class="eglink" href="/egs/org.w3c.dom/pkg.html?l=rel#Element%20Attributes">
Element Attributes
</a>
<a class="eglink" href="/egs/org.w3c.dom/pkg.html?l=rel#Elements">
Elements
</a>
<a class="eglink" href="/egs/org.w3c.dom/pkg.html?l=rel#Getting%20Nodes">
Getting Nodes
</a>
<a class="eglink" href="/egs/org.w3c.dom/pkg.html?l=rel#Text%20Nodes">
Text Nodes
</a>
<a class="eglink" href="/egs/org.w3c.dom/pkg.html?l=rel#XPath">
XPath
</a>
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