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+---
+title: element.hasAttribute
+slug: Web/API/Element/hasAttribute
+tags:
+  - DOM
+  - DOM Element Methods
+  - Gecko
+translation_of: Web/API/Element/hasAttribute
+---
+<div>{{ApiRef}}</div>
+
+<h2 id="Summary" name="Summary">概要</h2>
+
+<p>hasAttribute</p>
+
+<p>は指定の要素が指定の属性を持つか否かを示す真偽値を返します。</p>
+
+<p> </p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox"><var>var result</var> = <var>element</var>.hasAttribute(<var>attName</var>);
+</pre>
+
+<ul>
+ <li><code>result</code> : true または false の戻り値を保有</li>
+ <li><code>attName</code> : 属性の名前を表す文字列を指定</li>
+</ul>
+
+<h2 id="Example" name="Example">例</h2>
+
+<p>対象属性の存在をチェックし、無い場合にのみ属性を設定する例を以下に示します。</p>
+
+<pre class="brush:js;highlight:[4]">var d = document.getElementById("div1"); // 対象要素を取得
+
+if ( !d.hasAttribute("align") ) {
+  d.setAttribute("align", "center");
+}</pre>
+
+<h2 id="Notes" name="Notes">注記</h2>
+
+<div>{{DOMAttributeMethods}}</div>
+
+<h2 id="Specification" name="Specification">仕様書</h2>
+
+<ul>
+ <li><a href="http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-ElHasAttr">DOM Level 2 Core: hasAttribute</a></li>
+ <li><a href="http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-ElHasAttr">DOM Level 3 Core: hasAttribute</a></li>
+</ul>