---
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> 方法會檢查元素是否有任何的檢核、驗證條件，並且檢查是否滿足這些條件。如果元素沒有通過這些檢核，瀏覽器會於該元素上觸發一個可取消的 {{event("invalid")}} 事件，並回傳 <code>false</code>。</p>

<h2 id="語法">語法</h2>

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

<h2 id="規範">規範</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="瀏覽器相容性">瀏覽器相容性</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Edge</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop(2.0)}}</td>
   <td>10</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Chrome</th>
   <th>Edge</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Firefox OS</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoMobile(2.0)}}</td>
   <td>1.0</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="參見">參見</h2>

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