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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Node.compareDocumentPosition()
+slug: Web/API/Node/compareDocumentPosition
+tags:
+ - API
+ - Arborescence
+ - DOM
+ - Méthodes
+ - Noeuds
+ - Position
+translation_of: Web/API/Node/compareDocumentPosition
+---
+<div>{{APIRef("DOM")}}</div>
+
+<p>La méthode <code><strong>Node.compareDocumentPosition()</strong></code>compare la position du noeud courant par rapport à un autre noeud dans tout autre document.</p>
+
+<p>La valeur retournée est un masque de bits avec les valeurs suivantes :</p>
+
+<table>
+ <thead>
+ <tr>
+ <th scope="col">Nom</th>
+ <th scope="col">Valeur</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td><code>DOCUMENT_POSITION_DISCONNECTED</code></td>
+ <td>1</td>
+ </tr>
+ <tr>
+ <td><code>DOCUMENT_POSITION_PRECEDING</code></td>
+ <td>2</td>
+ </tr>
+ <tr>
+ <td><code>DOCUMENT_POSITION_FOLLOWING</code></td>
+ <td>4</td>
+ </tr>
+ <tr>
+ <td><code>DOCUMENT_POSITION_CONTAINS</code></td>
+ <td>8</td>
+ </tr>
+ <tr>
+ <td><code>DOCUMENT_POSITION_CONTAINED_BY</code></td>
+ <td>16</td>
+ </tr>
+ <tr>
+ <td><code>DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC</code></td>
+ <td>32</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Syntax" name="Syntax">Syntaxe</h2>
+
+<pre class="syntaxbox"><em>node</em>.compareDocumentPosition( <em>otherNode</em> )
+</pre>
+
+<h2 id="Example" name="Example">Exemple</h2>
+
+<pre class="brush:js">var head = document.getElementsByTagName('head').item(0);
+
+if (head.compareDocumentPosition(document.body) &amp; Node.DOCUMENT_POSITION_FOLLOWING) {
+ console.log("well-formed document");
+} else {
+ console.log("&lt;head&gt; is not before &lt;body&gt;");
+}
+</pre>
+
+<div class="note">
+<p><strong>Note :</strong> Parce que le résultat renvoyé par<em> </em><code>compareDocumentPosition</code> est un masque de bits, des <a href="https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Op%C3%A9rateurs/Op%C3%A9rateurs_binaires" title="/en-US/docs/Core_JavaScript_1.5_Guide/Operators/Bitwise_Operators">opérateurs binaires</a> doivent être utilisés pour des résultats significatifs.</p>
+</div>
+
+<div class="note">
+<p><strong>Note :</strong> La première instruction utilise l' <code>item(0)</code> de la méthode <a href="/en-US/docs/Web/API/NodeList/item">NodeList</a> , qui est l'équivalent de <code>getElementsByTagName('head')[0].</code></p>
+</div>
+
+<h2 id="Specification" name="Specification">Spécifications</h2>
+
+<table class="spectable standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Spécification</th>
+ <th scope="col">Statut</th>
+ <th scope="col">Commentaire</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM WHATWG','#dom-node-comparedocumentposition','Node.compareDocumentPosition()')}}</td>
+ <td>{{Spec2('DOM WHATWG')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM3 Core','core.html#Node3-compareDocumentPosition','Node.compareDocumentPosition()')}}</td>
+ <td>{{Spec2('DOM3 Core')}}</td>
+ <td>Définition initiale</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilité_des_navigateurs">Compatibilité des navigateurs</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Fonctionnalité</th>
+ <th>Chrome</th>
+ <th>Edge</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>9.0</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Fonctionnalité</th>
+ <th>Android</th>
+ <th>Edge</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>{{CompatUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Voir_aussi">Voir aussi</h2>
+
+<ul>
+ <li><code><a href="https://developer.mozilla.org/fr/docs/Web/API/Node/contains" title="/en-US/docs/DOM/Node.contains">Node.contains</a></code></li>
+</ul>