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<title>XML DOM - Node Types</title>
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<h1>XML DOM <span class="color_h1">Node Types</span></h1>
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<p class="intro">The DOM presents a document as a hierarchy of node objects.</p>
<hr>
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<h2>Try it Yourself - Examples</h2>
</div>
<p>The examples below use the XML file <a href="javascript:void(0)" onclick="displayXML('books.xml')">books.xml</a>. </p>
<p><a target="_blank" href="tryit3110.html?filename=try_dom_nodetype">Display nodeName and nodeType of all elements</a></p>
<p><a target="_blank" href="tryit7711.html?filename=try_dom_nodevalue">Display nodeName and nodeValue of all elements</a></p>
<div id="w3Modal01" class="w3-modal" style="width:100%">
<div class="w3-modal-content w3-card-4" style="width:90%">
<header class="w3-container w3-display-container w3-theme">
<span onclick="document.getElementById('w3Modal01').style.display='none'" class="w3-button w3-xlarge w3-display-topright">×</span>
<h3 id="w3ModalHeading01">Header</h3>
</header>
<div id="w3ModalContent01" class="w3-padding"></div>
</div>
</div>
<script>
function w3displayXML(file,div) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
display(this,div);
}
};
xhttp.open("GET.html", file, true);
xhttp.send();
}
function display(xml,div) {
var x, parser, xmlDoc, txt, etxt;
try {
parser = new DOMParser();
xmlDoc = parser.parseFromString(xml.responseText,"text/xml");
x = xmlDoc.documentElement;
txt = "<span style='color:brown'><" + x.nodeName + "></span>"
level = 1;
txt += myLoop(x);
level = 0;
txt += "<br><span style='color:brown'></" + x.nodeName + "></span>"
if (xmlDoc.getElementsByTagName("parsererror").length > 0) {
etxt = xmlDoc.getElementsByTagName("parsererror")[0].innerHTML;
if (etxt != undefined) {
txt = xmlDoc.getElementsByTagName("parsererror")[0].innerHTML + txt;
}
}
} catch(err) {
txt = err.message
}
document.getElementById(div).innerHTML = txt;
}
function myLoop(x) {
var i, j, y, z, txt;
txt = "";
z = x.childNodes;
for (i = 0; i < z.length; i++) {
y = z[i];
if (y.nodeType == 1) {
if (y.nodeName != "parsererror") {
txt += "<br>" + makeSpace(level);
txt += "<span style='color:brown'><" +
y.nodeName + "</span>" + getAttributes(y) + "<span style='color:brown'>></span>";
level++;
txt += myLoop(y);
level--;
txt += "<span style='color:brown'></" +
y.nodeName + "></span>";
}
} else {
if (y.nodeType == 3) {
txt += y.nodeValue;
} else {
//txt += y.nodeType + y.nodeValue;
}
}
}
return txt;
}
function getAttributes(xml) {
var i;
var txt = "";
var x = xml.attributes;
for (i = 0; i < x.length; i++) {
if (x[i].name == "style") {return txt;}
txt += " <span style='color:red'>" + x[i].name + "=" + "</span>" +
"<span style='color:blue'>" + '"' + x[i].value + '"' + "</span>";
}
return txt;
}
function makeSpace(x) {
var i, txt = "";
for (i = 0; i < level; i++) {
txt += " ";
}
return txt;
}
function displayXML(name) {
document.getElementById('w3ModalHeading01').innerHTML = name;
document.getElementById('w3ModalContent01').innerHTML = '';
document.getElementById('w3Modal01').style.display='block';
w3displayXML(name,'w3ModalContent01');
}
</script>
<hr>
<h2>Node Types</h2>
<p>The following table lists the different W3C node types, and which node types they
may have as children:</p>
<table class="ws-table-all notranslate">
<tr>
<th style="width:30%">Node Type</th>
<th style="width:40%">Description</th>
<th>Children</th>
</tr>
<tr>
<td>Document</td>
<td>Represents the entire document (the root-node of the DOM tree)</td>
<td>Element (max. one), ProcessingInstruction, Comment, DocumentType</td>
</tr>
<tr>
<td>DocumentFragment</td>
<td>Represents a "lightweight" Document object, which can hold a portion of a document</td>
<td>Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference</td>
</tr>
<tr>
<td>DocumentType</td>
<td>Provides an interface to the entities defined for the document</td>
<td>None</td>
</tr>
<tr>
<td>ProcessingInstruction</td>
<td>Represents a processing instruction</td>
<td>None</td>
</tr>
<tr>
<td>EntityReference</td>
<td>Represents an entity reference</td>
<td>Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference</td>
</tr>
<tr>
<td>Element</td>
<td>Represents an element</td>
<td>Element, Text, Comment, ProcessingInstruction, CDATASection, EntityReference</td>
</tr>
<tr>
<td>Attr</td>
<td>Represents an attribute</td>
<td>Text, EntityReference</td>
</tr>
<tr>
<td>Text</td>
<td>Represents textual content in an element or attribute</td>
<td>None</td>
</tr>
<tr>
<td>CDATASection</td>
<td>Represents a CDATA section in a document (text that will NOT be parsed by a parser)</td>
<td>None</td>
</tr>
<tr>
<td>Comment</td>
<td>Represents a comment</td>
<td>None</td>
</tr>
<tr>
<td>Entity</td>
<td>Represents an entity</td>
<td>Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference</td>
</tr>
<tr>
<td>Notation</td>
<td>Represents a notation declared in the DTD</td>
<td>None</td>
</tr>
</table>
<hr>
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<hr>
<h2>Node Types - Return Values</h2>
<p>The following table lists what the nodeName and the nodeValue properties will return for each node type:</p>
<table class="ws-table-all notranslate">
<tr>
<th style="width:30%">Node Type</th>
<th style="width:40%">nodeName returns</th>
<th>nodeValue returns</th>
</tr>
<tr>
<td>Document</td>
<td>#document</td>
<td>null</td>
</tr>
<tr>
<td>DocumentFragment</td>
<td>#document fragment</td>
<td>null</td>
</tr>
<tr>
<td>DocumentType</td>
<td>doctype name</td>
<td>null</td>
</tr>
<tr>
<td>EntityReference</td>
<td>entity reference name</td>
<td>null</td>
</tr>
<tr>
<td>Element</td>
<td>element name</td>
<td>null</td>
</tr>
<tr>
<td>Attr</td>
<td>attribute name</td>
<td>attribute value</td>
</tr>
<tr>
<td>ProcessingInstruction</td>
<td>target</td>
<td>content of node</td>
</tr>
<tr>
<td>Comment</td>
<td>#comment</td>
<td>comment text</td>
</tr>
<tr>
<td>Text</td>
<td>#text</td>
<td>content of node</td>
</tr>
<tr>
<td>CDATASection</td>
<td>#cdata-section</td>
<td>content of node</td>
</tr>
<tr>
<td>Entity</td>
<td>entity name</td>
<td>null</td>
</tr>
<tr>
<td>Notation</td>
<td>notation name</td>
<td>null</td>
</tr>
</table>
<h2>NodeTypes - Named Constants</h2>
<table class="ws-table-all notranslate">
<tr>
<th style="width:15%">NodeType</th>
<th>Named Constant</th>
</tr>
<tr>
<td>1</td>
<td>ELEMENT_NODE</td>
</tr>
<tr>
<td>2</td>
<td>ATTRIBUTE_NODE</td>
</tr>
<tr>
<td>3</td>
<td>TEXT_NODE</td>
</tr>
<tr>
<td>4</td>
<td>CDATA_SECTION_NODE</td>
</tr>
<tr>
<td>5</td>
<td>ENTITY_REFERENCE_NODE</td>
</tr>
<tr>
<td>6</td>
<td>ENTITY_NODE</td>
</tr>
<tr>
<td>7</td>
<td>PROCESSING_INSTRUCTION_NODE</td>
</tr>
<tr>
<td>8</td>
<td>COMMENT_NODE</td>
</tr>
<tr>
<td>9</td>
<td>DOCUMENT_NODE</td>
</tr>
<tr>
<td>10</td>
<td>DOCUMENT_TYPE_NODE</td>
</tr>
<tr>
<td>11</td>
<td>DOCUMENT_FRAGMENT_NODE</td>
</tr>
<tr>
<td>12</td>
<td>NOTATION_NODE</td>
</tr>
</table>
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