---
title: HTMLFormElement.length
slug: Web/API/HTMLFormElement/length
tags:
  - DOM
  - Gecko
  - Gecko DOM Reference
translation_of: Web/API/HTMLFormElement/length
---
<div>
 {{ApiRef}}</div>
<h2 id="Summary" name="Summary">概要</h2>
<p><code>length</code> は {{htmlelement("form")}} 要素内のフォームコントロールの数を返します。</p>
<h2 id="Syntax" name="Syntax">構文</h2>
<pre class="syntaxbox"><var>integer</var> = form.length
</pre>
<h2 id="Example" name="Example">例</h2>
<pre class="brush:js">if (document.getElementById("form1").length &gt; 1) {
  // more than one form control here
}
</pre>
<h2 id="Specifications" name="Specifications">仕様書</h2>
<ul>
 <li><a href="http://www.w3.org/TR/DOM-Level-2-HTML/html.html#HTML-HTMLFormElement-length">DOM Level 2: length</a></li>
</ul>