projects / OpenSPARC-T2-SAM / blame
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| 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 | ||
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| 137 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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