Revision 737091 of NamedNodeMap

<div>
 {{APIRef}}</div>
<p>The <code><strong>NamedNodeMap</strong></code> interface represents a collection of {{domxref("Attr")}} objects. Objects inside a <code>NamedNodeMap</code> are not in any particular order, unlike {{ domxref("NodeList") }}, although they may be accessed by an index as in an array.</p>
<p>A <code>NamedNodeMap</code> object is&nbsp;<em>live</em> and will thus be auto-updated if changes are made to its contents internally or elsewhere.</p>
<div class="note">
 <p>Although called <code>NamedNodeMap</code>, this interface doesn't deal with {{domxref("Node")}} objects but with {{domxref("Attr")}} objects, which were originally a specialized class of {{domxref("Node")}}, and still are in some implementations.</p>
</div>
<h2 id="Properties">Properties</h2>
<p><em>This interface doesn't inherit any property.</em></p>
<dl>
 <dt>
  {{ domxref("NamedNodeMap.length") }} {{ReadOnlyInline}}</dt>
 <dd>
  Returns the amount of objects in the map.</dd>
</dl>
<h2 id="Methods">Methods</h2>
<p><em>This interface doesn't inherit any method.</em></p>
<dl>
 <dt>
  {{domxref("NamedNodeMap.getNamedItem()")}}</dt>
 <dd>
  Returns a {{ domxref("Attr") }}, corresponding to the given name.</dd>
 <dt>
  {{domxref("NamedNodeMap.setNamedItem()")}}</dt>
 <dd>
  Replaces, or adds, the {{ domxref("Attr") }} identified in the map by the given name.</dd>
 <dt>
  {{domxref("NamedNodeMap.removeNamedItem()")}}</dt>
 <dd>
  Removes the {{ domxref("Attr") }} identified by the given map.</dd>
 <dt>
  {{domxref("NamedNodeMap.item()")}}</dt>
 <dd>
  Returns the {{ domxref("Attr") }} at the given index, or <code>null</code> if the index is higher or equal to the number of nodes.</dd>
 <dt>
  {{domxref("NamedNodeMap.getNamedItemNS()")}}</dt>
 <dd>
  Returns a {{ domxref("Attr") }} identifyied by a namespace and related local name.</dd>
 <dt>
  {{domxref("NamedNodeMap.setNamedItemNS()")}}</dt>
 <dd>
  Replaces, or adds, the {{ domxref("Attr") }} identified in the map by the given namespace and related local name.</dd>
 <dt>
  {{domxref("NamedNodeMap.removeNamedItemNS()")}}</dt>
 <dd>
  Removes the {{ domxref("Attr") }} identified by the given namespace and related local name.</dd>
</dl>
<h2 id="Specifications">Specifications</h2>
<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('DOM WHATWG', '#interface-namednodemap', 'NamedNodeMap')}}</td>
   <td>{{Spec2('DOM WHATWG')}}</td>
   <td>Deals with {{domxref("Attr")}} instead of {{domxref("Node")}}</td>
  </tr>
  <tr>
   <td>{{SpecName('DOM3 Core', 'core.html#ID-1780488922', 'NamedNodeMap')}}</td>
   <td>{{Spec2('DOM3 Core')}}</td>
   <td>No change from {{SpecName('DOM2 Core')}}</td>
  </tr>
  <tr>
   <td>{{SpecName('DOM2 Core', 'core.html#ID-1780488922', 'NamedNodeMap')}}</td>
   <td>{{Spec2('DOM2 Core')}}</td>
   <td>Added <code>getNamedItemNS()</code>, <code>setNamedItemNS()</code> and <code>removeNamedItemNS()</code></td>
  </tr>
  <tr>
   <td>{{SpecName('DOM1', 'core.html#ID-1780488922', 'NamedNodeMap')}}</td>
   <td>{{Spec2('DOM1')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{ CompatibilityTable() }}</p>
<div id="compat-desktop">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Chrome</th>
    <th>Firefox (Gecko)</th>
    <th>Internet Explorer</th>
    <th>Opera</th>
    <th>Safari</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
   </tr>
   <tr>
    <td>Deals with {{domxref("Attr")}} rather than {{domxref("Node")}}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{CompatGeckoDesktop(22)}} (but this interface was named <code>mozNamedAttrMap</code> to reflect this change)<br />
     {{CompatGeckoDesktop(34)}} (interface named back to <code>NamedNodeMap</code>)<br />
     &nbsp;</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<div id="compat-mobile">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Android</th>
    <th>Firefox Mobile (Gecko)</th>
    <th>IE Mobile</th>
    <th>Opera Mobile</th>
    <th>Safari Mobile</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
   </tr>
   <tr>
    <td>Deals with {{domxref("Attr")}} rather than {{domxref("Node")}}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{CompatGeckoMobile(22)}} (but this interface was named <code>mozNamedAttrMap</code> to reflect this change)<br />
     {{CompatGeckoMobile(34)}} (interface named back to <code>NamedNodeMap</code>)</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<h2 id="See_also">See also</h2>
<ul>
 <li>{{ domxref("Element.attributes") }}</li>
</ul>