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

<p><code><strong>HTMLSelectElement.setCustomValidity()</strong></code> 方法可為指定的元素設定自定義檢核訊息。使用空字串表示元素<em>沒有</em>發生違反自定檢核條件的錯誤。</p>

<h2 id="語法">語法</h2>

<pre class="eval  language-html"><code class="language-html"><em>selectElt</em>.setCustomValidity(<em>string</em>);</code></pre>

<h3 id="參數">參數</h3>

<ul>
 <li><em>string</em>{{domxref("DOMString")}},代表錯誤訊息。</li>
</ul>

<h2 id="規範">規範</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">規範</th>
   <th scope="col">狀態</th>
   <th scope="col">意見</th>
  </tr>
  <tr>
   <td>{{SpecName('HTML WHATWG', '#dom-cva-setcustomvalidity', 'HTMLSelectElement.setCustomValidity()')}}</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-setcustomvalidity', 'HTMLSelectElement.setCustomValidity()')}}</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>

<p>{{Compat("api.HTMLSelectElement.setCustomValidity")}}</p>

<h2 id="參見">參見</h2>

<ul>
 <li><a href="/zh-TW/docs/Web/Guide/HTML/HTML5/Constraint_validation">表單驗證</a></li>
</ul>