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<title>HTML DOM Properties and Methods</title>
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
<h1>HTML DOM Properties and Methods</h1>
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<p class="intro">Properties and methods define the programming interface to the
HTML DOM.</p>
<hr />
<h2>Programming Interface</h2>
<p>The DOM models HTML as a set of node objects. The nodes can be accessed with
JavaScript or other programming languages. In this tutorial we use JavaScript.</p>
<p>The programming interface to the DOM is defined by a set standard properties
and methods.</p>
<p><b>Properties</b> are often referred to as something that is (i.e. nodename
is "p").</p>
<p><b>Methods</b> are often referred to as something that is done (i.e. delete
"p").</p>
<hr />
<h2>HTML DOM Properties</h2>
<p>These are some typical DOM properties:</p>
<ul>
<li>x.innerHTML - the inner text value of x (a HTML element)</li>
<li>x.nodeName - the name of x</li>
<li>x.nodeValue - the value of x</li>
<li>x.parentNode - the parent node of x</li>
<li>x.childNodes - the child nodes of x</li>
<li>x.attributes - the attributes nodes of x</li>
</ul>
<p><b>Note:</b> In the list above, x is a node object (HTML element).</p>
<hr />
<h2>HTML DOM Methods</h2>
<ul>
<li>x.getElementByID(<i>id</i>) - get the element with a specified id</li>
<li>x.getElementsByTagName(<i>name</i>) - get all elements with a specified
tag name</li>
<li>x.appendChild(<i>node</i>) - insert a child node to x</li>
<li>x.removeChild(<i>node</i>) - remove a child node from x</li>
</ul>
<p><b>Note:</b> In the list above, x is a node object (HTML element).</p>
<hr />
<h2>innerHTML</h2>
<p>The easiest way to get or modify the content of an element is by using the
innerHTML property.</p>
<p>innerHTML is not a part of the W3C DOM specification. However, it is
supported by all major browsers.</p>
<p>The innerHTML property is useful for returning or replacing the content of
HTML elements (including <html> and <body>), it can also be used to view the
source of a page that has been dynamically modified.</p>
<h2>Example</h2>
<p>The JavaScript code to get the text from a <p> element with the id "intro" in
a HTML document:</p>
<p>txt=document.getElementById("intro").innerHTML</p>
<p>After the execution of the statement, txt will hold the value "Hello World!"
</p>
<p>Explained:</p>
<ul>
<li><b>document</b> - the current HTML document</li>
<li><b>getElementById("intro")</b> - the <p> element with the id "intro"</li>
<li><b>innerHTML</b> - the inner text of the HTML element</li>
</ul>
<p>In the example above, getElementById is a method, while innerHMTL is a property. </p>
<p><a target="_blank" href="../js/tryit.asp@filename=try_dom_methods">Try it
yourself</a></p>
<hr />
<h2>childNodes and nodeValue</h2>
<p>The W3C DOM specified way of getting to the content of an element works like
this:</p>
<p>The JavaScript code to get the text from a <p> element with the id "intro" in
a HTML document:</p>
<p>txt=document.getElementById("intro").childNodes[0].nodeValue</p>
<p>After the execution of the statement, txt will hold the value "Hello World!"
</p>
<p>Explained:</p>
<ul>
<li><b>document</b> - the current HTML document</li>
<li><b>getElementById("intro")</b> - the <p> element with the id "intro"</li>
<li><b>childNodes[0]</b> - the first child of the <p> element (the text
node)</li>
<li><b>nodeValue</b> - the value of the node (the text itself)</li>
</ul>
<p>In the example above, getElementById is a method, while childNodes and
nodeValue are properties. </p>
<p><a target="_blank" href="../js/tryit.asp@filename=try_dom_methods2">Try it
yourself</a></p>
<p>In this tutorial we will mostly use the innerHTML property. However, learning
the method above is useful for understanding the tree structure of the DOM and
dealing with XML files.</p>
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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
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