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----
-title: ParentNode.childElementCount
-slug: Web/API/ParentNode/childElementCount
-tags:
- - API
- - DOM
- - Noeuds
- - Propriétés
- - Reference
- - parent
-translation_of: Web/API/ParentNode/childElementCount
----
-<div>
-<p>{{APIRef("DOM") }}</p>
-</div>
-
-<p>La propriété <code><strong>ParentNode.childElementCount</strong></code> en lecture seule renvoie un <code>unsigned long</code> (<em>long non signé</em>) représentant le nombre d'élèments fils de l'élément donné.</p>
-
-<div class="note">
-<p>Cette propriété a été définie dans la pure interface {{domxref("ElementTraversal")}}.<br>
- Comme cette interface contenait deux différents jeux de propriétés, l'un visant les  {{domxref("Node")}} (<em>noeuds</em>) qui ont des enfants, l'autre les enfants, ils ont été déplacés dans deux interfaces pures, {{domxref("ParentNode")}} et {{domxref("ChildNode")}}. Dans ce cas, <code>childElementCount</code> a été rattaché à {{domxref("ParentNode")}}. C'est un changement assez technique qui ne devrait pas affecter la compatibilité.</p>
-</div>
-
-<h2 id="Syntaxe">Syntaxe</h2>
-
-<pre class="syntaxbox">var <var>count</var> = <em>node</em>.childElementCount;
-</pre>
-
-<dl>
- <dt>count</dt>
- <dd>détient la valeur de retour, un type <code>unsigned long</code> (<em>long non signé</em>) (simplement un nombre entier)</dd>
- <dt>node</dt>
- <dd>est un objet représentant un <code>Document</code>, un <code>DocumentFragment</code> ou un <code>Element</code>.</dd>
-</dl>
-
-<h2 id="Exemple">Exemple</h2>
-
-<pre class="brush:js line-numbers language-js"><code class="language-js"><span class="keyword token">var</span> foo <span class="operator token">=</span> document<span class="punctuation token">.</span><span class="function token">getElementById</span><span class="punctuation token">(</span><span class="string token">"foo"</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
-<span class="keyword token">if</span> <span class="punctuation token">(</span>foo<span class="punctuation token">.</span>childElementCount <span class="operator token">&gt;</span> <span class="number token">0</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
- <span class="comment token">// faire quelque chose</span>
-<span class="punctuation token">}</span></code></pre>
-
-<h2 id="Polyfill_pour_IE8_IE9_Safari">Polyfill pour IE8 &amp; IE9 &amp; Safari</h2>
-
-<p>Cette propriété n'est pas supportée par les versions antérieures à IE9 ni par IE9 ni par Safari. Ainsi, les objets Document, DocumentFragment dans ces navigateurs ne l'ont pas.</p>
-
-<pre class="brush:js line-numbers language-js"><code class="language-js"><span class="punctuation token">;</span><span class="punctuation token">(</span><span class="keyword token">function</span><span class="punctuation token">(</span>constructor<span class="punctuation token">)</span> <span class="punctuation token">{</span>
- <span class="keyword token">if</span> <span class="punctuation token">(</span>constructor <span class="operator token">&amp;&amp;</span>
- constructor<span class="punctuation token">.</span>prototype <span class="operator token">&amp;&amp;</span>
- constructor<span class="punctuation token">.</span>prototype<span class="punctuation token">.</span>childElementCount <span class="operator token">==</span> <span class="keyword token">null</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
- Object<span class="punctuation token">.</span><span class="function token">defineProperty</span><span class="punctuation token">(</span>constructor<span class="punctuation token">.</span>prototype<span class="punctuation token">,</span> <span class="string token">'childElementCount'</span><span class="punctuation token">,</span> <span class="punctuation token">{</span>
- <span class="keyword token">get</span><span class="punctuation token">:</span> <span class="keyword token">function</span><span class="punctuation token">(</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
- <span class="keyword token">var</span> i <span class="operator token">=</span> <span class="number token">0</span><span class="punctuation token">,</span> count <span class="operator token">=</span> <span class="number token">0</span><span class="punctuation token">,</span> node<span class="punctuation token">,</span> nodes <span class="operator token">=</span> <span class="keyword token">this</span><span class="punctuation token">.</span>childNodes<span class="punctuation token">;</span>
- <span class="keyword token">while</span> <span class="punctuation token">(</span>node <span class="operator token">=</span> nodes<span class="punctuation token">[</span>i<span class="operator token">++</span><span class="punctuation token">]</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
- <span class="keyword token">if</span> <span class="punctuation token">(</span>node<span class="punctuation token">.</span>nodeType <span class="operator token">===</span> <span class="number token">1</span><span class="punctuation token">)</span> count<span class="operator token">++</span><span class="punctuation token">;</span>
- <span class="punctuation token">}</span>
- <span class="keyword token">return</span> count<span class="punctuation token">;</span>
- <span class="punctuation token">}</span>
- <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
- <span class="punctuation token">}</span>
-<span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">(</span>window<span class="punctuation token">.</span>Node <span class="operator token">||</span> window<span class="punctuation token">.</span>Element<span class="punctuation token">)</span><span class="punctuation token">;</span></code></pre>
-
-<h2 id="Spécification">Spécification</h2>
-
-<table class="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-parentnode-childElementCount', 'ParentNode.childElementCount')}}</td>
- <td>{{Spec2('DOM WHATWG')}}</td>
- <td>Divise l'interface <code>ElementTraversal</code> en {{domxref("ChildNode")}} et <code>ParentNode</code>. La propriété est maintenant définie sur cette dernière.<br>
- Les {{domxref("Document")}} et {{domxref("DocumentFragment")}} implémentent la nouvelle interface.</td>
- </tr>
- <tr>
- <td>{{SpecName('Element Traversal', '#attribute-childElementCount', 'ElementTraversal.childElementCount')}}</td>
- <td>{{Spec2('Element Traversal')}}</td>
- <td>Ajout de sa définition initiale à la pure interface <code>ElementTraversal</code> et de son utilisation sur {{domxref("Element")}}.</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Compatibilité_des_navigateurs">Compatibilité des navigateurs</h2>
-
-
-<p>{{Compat("api.ParentNode.childElementCount")}}</p>
-
-<h2 id="Voir_aussi">Voir aussi</h2>
-
-<ul>
- <li>Les interfaces pures {{domxref("ParentNode")}} et {{domxref("ChildNode")}}.</li>
- <li>
- <div class="syntaxbox">Types d'objets implémentant cette interface pure : {{domxref("Document")}}, {{domxref("Element")}} et {{domxref("DocumentFragment")}}.</div>
- </li>
-</ul>