Commit | Line | Data |
---|---|---|
920dae64 AT |
1 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
2 | <html> | |
3 | <head> | |
4 | <link rel="STYLESHEET" href="lib.css" type='text/css' /> | |
5 | <link rel="SHORTCUT ICON" href="../icons/pyfav.png" type="image/png" /> | |
6 | <link rel='start' href='../index.html' title='Python Documentation Index' /> | |
7 | <link rel="first" href="lib.html" title='Python Library Reference' /> | |
8 | <link rel='contents' href='contents.html' title="Contents" /> | |
9 | <link rel='index' href='genindex.html' title='Index' /> | |
10 | <link rel='last' href='about.html' title='About this document...' /> | |
11 | <link rel='help' href='about.html' title='About this document...' /> | |
12 | <link rel="next" href="dom-documenttype-objects.html" /> | |
13 | <link rel="prev" href="dom-node-objects.html" /> | |
14 | <link rel="parent" href="node652.html" /> | |
15 | <link rel="next" href="dom-documenttype-objects.html" /> | |
16 | <meta name='aesop' content='information' /> | |
17 | <title>13.6.2.3 NodeList Objects </title> | |
18 | </head> | |
19 | <body> | |
20 | <DIV CLASS="navigation"> | |
21 | <div id='top-navigation-panel' xml:id='top-navigation-panel'> | |
22 | <table align="center" width="100%" cellpadding="0" cellspacing="2"> | |
23 | <tr> | |
24 | <td class='online-navigation'><a rel="prev" title="13.6.2.2 Node Objects" | |
25 | href="dom-node-objects.html"><img src='../icons/previous.png' | |
26 | border='0' height='32' alt='Previous Page' width='32' /></A></td> | |
27 | <td class='online-navigation'><a rel="parent" title="13.6.2 Objects in the" | |
28 | href="node652.html"><img src='../icons/up.png' | |
29 | border='0' height='32' alt='Up One Level' width='32' /></A></td> | |
30 | <td class='online-navigation'><a rel="next" title="13.6.2.4 DocumentType Objects" | |
31 | href="dom-documenttype-objects.html"><img src='../icons/next.png' | |
32 | border='0' height='32' alt='Next Page' width='32' /></A></td> | |
33 | <td align="center" width="100%">Python Library Reference</td> | |
34 | <td class='online-navigation'><a rel="contents" title="Table of Contents" | |
35 | href="contents.html"><img src='../icons/contents.png' | |
36 | border='0' height='32' alt='Contents' width='32' /></A></td> | |
37 | <td class='online-navigation'><a href="modindex.html" title="Module Index"><img src='../icons/modules.png' | |
38 | border='0' height='32' alt='Module Index' width='32' /></a></td> | |
39 | <td class='online-navigation'><a rel="index" title="Index" | |
40 | href="genindex.html"><img src='../icons/index.png' | |
41 | border='0' height='32' alt='Index' width='32' /></A></td> | |
42 | </tr></table> | |
43 | <div class='online-navigation'> | |
44 | <b class="navlabel">Previous:</b> | |
45 | <a class="sectref" rel="prev" href="dom-node-objects.html">13.6.2.2 Node Objects</A> | |
46 | <b class="navlabel">Up:</b> | |
47 | <a class="sectref" rel="parent" href="node652.html">13.6.2 Objects in the</A> | |
48 | <b class="navlabel">Next:</b> | |
49 | <a class="sectref" rel="next" href="dom-documenttype-objects.html">13.6.2.4 DocumentType Objects</A> | |
50 | </div> | |
51 | <hr /></div> | |
52 | </DIV> | |
53 | <!--End of Navigation Panel--> | |
54 | ||
55 | <H3><A NAME="SECTION0015623000000000000000"></A><A NAME="dom-nodelist-objects"></A> | |
56 | <BR> | |
57 | 13.6.2.3 NodeList Objects | |
58 | </H3> | |
59 | ||
60 | <P> | |
61 | A <tt class="class">NodeList</tt> represents a sequence of nodes. These objects are | |
62 | used in two ways in the DOM Core recommendation: the | |
63 | <tt class="class">Element</tt> objects provides one as its list of child nodes, and | |
64 | the <tt class="method">getElementsByTagName()</tt> and | |
65 | <tt class="method">getElementsByTagNameNS()</tt> methods of <tt class="class">Node</tt> return | |
66 | objects with this interface to represent query results. | |
67 | ||
68 | <P> | |
69 | The DOM Level 2 recommendation defines one method and one attribute | |
70 | for these objects: | |
71 | ||
72 | <P> | |
73 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
74 | <td><nobr><b><tt id='l2h-4385' xml:id='l2h-4385' class="method">item</tt></b>(</nobr></td> | |
75 | <td><var>i</var>)</td></tr></table></dt> | |
76 | <dd> | |
77 | Return the <var>i</var>'th item from the sequence, if there is one, or | |
78 | <code>None</code>. The index <var>i</var> is not allowed to be less then zero | |
79 | or greater than or equal to the length of the sequence. | |
80 | </dl> | |
81 | ||
82 | <P> | |
83 | <dl><dt><b><tt id='l2h-4386' xml:id='l2h-4386' class="member">length</tt></b></dt> | |
84 | <dd> | |
85 | The number of nodes in the sequence. | |
86 | </dl> | |
87 | ||
88 | <P> | |
89 | In addition, the Python DOM interface requires that some additional | |
90 | support is provided to allow <tt class="class">NodeList</tt> objects to be used as | |
91 | Python sequences. All <tt class="class">NodeList</tt> implementations must include | |
92 | support for <tt class="method">__len__()</tt> and <tt class="method">__getitem__()</tt>; this allows | |
93 | iteration over the <tt class="class">NodeList</tt> in <tt class="keyword">for</tt> statements and | |
94 | proper support for the <tt class="function">len()</tt> built-in function. | |
95 | ||
96 | <P> | |
97 | If a DOM implementation supports modification of the document, the | |
98 | <tt class="class">NodeList</tt> implementation must also support the | |
99 | <tt class="method">__setitem__()</tt> and <tt class="method">__delitem__()</tt> methods. | |
100 | ||
101 | <P> | |
102 | ||
103 | <DIV CLASS="navigation"> | |
104 | <div class='online-navigation'> | |
105 | <p></p><hr /> | |
106 | <table align="center" width="100%" cellpadding="0" cellspacing="2"> | |
107 | <tr> | |
108 | <td class='online-navigation'><a rel="prev" title="13.6.2.2 Node Objects" | |
109 | href="dom-node-objects.html"><img src='../icons/previous.png' | |
110 | border='0' height='32' alt='Previous Page' width='32' /></A></td> | |
111 | <td class='online-navigation'><a rel="parent" title="13.6.2 Objects in the" | |
112 | href="node652.html"><img src='../icons/up.png' | |
113 | border='0' height='32' alt='Up One Level' width='32' /></A></td> | |
114 | <td class='online-navigation'><a rel="next" title="13.6.2.4 DocumentType Objects" | |
115 | href="dom-documenttype-objects.html"><img src='../icons/next.png' | |
116 | border='0' height='32' alt='Next Page' width='32' /></A></td> | |
117 | <td align="center" width="100%">Python Library Reference</td> | |
118 | <td class='online-navigation'><a rel="contents" title="Table of Contents" | |
119 | href="contents.html"><img src='../icons/contents.png' | |
120 | border='0' height='32' alt='Contents' width='32' /></A></td> | |
121 | <td class='online-navigation'><a href="modindex.html" title="Module Index"><img src='../icons/modules.png' | |
122 | border='0' height='32' alt='Module Index' width='32' /></a></td> | |
123 | <td class='online-navigation'><a rel="index" title="Index" | |
124 | href="genindex.html"><img src='../icons/index.png' | |
125 | border='0' height='32' alt='Index' width='32' /></A></td> | |
126 | </tr></table> | |
127 | <div class='online-navigation'> | |
128 | <b class="navlabel">Previous:</b> | |
129 | <a class="sectref" rel="prev" href="dom-node-objects.html">13.6.2.2 Node Objects</A> | |
130 | <b class="navlabel">Up:</b> | |
131 | <a class="sectref" rel="parent" href="node652.html">13.6.2 Objects in the</A> | |
132 | <b class="navlabel">Next:</b> | |
133 | <a class="sectref" rel="next" href="dom-documenttype-objects.html">13.6.2.4 DocumentType Objects</A> | |
134 | </div> | |
135 | </div> | |
136 | <hr /> | |
137 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
138 | </DIV> | |
139 | <!--End of Navigation Panel--> | |
140 | <ADDRESS> | |
141 | See <i><a href="about.html">About this document...</a></i> for information on suggesting changes. | |
142 | </ADDRESS> | |
143 | </BODY> | |
144 | </HTML> |