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---
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>
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