---
title: HTMLSelectElement.checkValidity()
slug: Web/API/HTMLSelectElement/checkValidity
translation_of: Web/API/HTMLSelectElement/checkValidity
---
<div>{{ APIRef("HTML DOM") }}</div>

<p><code><strong>HTMLSelectElement.checkValidity()</strong></code> 会检查元素是否有任何输入约束条件，并且检查值是否符合约束条件. 如果值是不符合约束条件的, 浏览器就会在该元素上触发一个可以撤销的 {{event("invalid")}} 事件,  然后返回 <code>false</code>.</p>

<h2 id="Syntax">Syntax</h2>

<pre class="eval  language-html"><code class="language-html">var <em>result</em> = <em>selectElt</em>.checkValidity();</code></pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('HTML WHATWG', '#dom-cva-checkvalidity', 'HTMLSelectElement.checkValidity()')}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>No change since the latest snapshot, {{SpecName('HTML5 W3C')}}.</td>
  </tr>
  <tr>
   <td>{{SpecName('HTML5 W3C', 'forms.html#dom-cva-checkvalidity', 'HTMLSelectElement.checkValidity()')}}</td>
   <td>{{Spec2('HTML5 W3C')}}</td>
   <td>Initial definition, snapshot of {{SpecName('HTML WHATWG')}}</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

{{Compat("api.HTMLSelectElement.checkValidity")}}

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/Guide/HTML/HTML5/Constraint_validation">Form validation.</a></li>
</ul>