files/ja/web/api/element/childelementcount/index.html


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---
title: Element.childElementCount
slug: Web/API/Element/childElementCount
tags:
  - API
  - DOM
  - Property
  - Reference
browser-compat: api.Element.childElementCount
translation_of: Web/API/Element/childElementCount
original_slug: Web/API/ParentNode/childElementCount
---
<div>{{ APIRef("DOM") }}</div>

<p><code><strong>Element.childElementCount</strong></code> は読み取り専用のプロパティで、この要素の子要素の数を返します。</p>

<h2 id="Syntax">構文</h2>

<pre class="brush: js">element.childElementCount;</pre>

<h2 id="Example">例</h2>

<pre class="brush:js">let sidebar = document.getElementById('sidebar');
if (sidebar.childElementCount &gt; 0) {
  // 何もしない
}
</pre>

<h2 id="Specifications">仕様書</h2>

{{Specifications}}

<h2 id="Browser_compatibility">ブラウザーの互換性</h2>

<p>{{Compat}}</p>

<h2 id="See_also">関連情報</h2>

<ul>
  <li>{{domxref("Document.childElementCount")}}</li>
  <li>{{domxref("DocumentFragment.childElementCount")}}</li>
</ul>