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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:17 -0500
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+---
+title: Document.hasFocus()
+slug: Web/API/Document/hasFocus
+tags:
+ - API
+ - DOM
+ - Focus
+ - Method
+ - Reference
+translation_of: Web/API/Document/hasFocus
+---
+<p>{{ ApiRef("DOM") }}</p>
+
+<p><code><strong>Document.hasFocus()</strong></code> 메소드는 문서 또는 문서 내의 요소(element) 중 어느 하나라도 포커스(focus)를 갖고 있으면 <code>true, </code>그렇지 않으면<code> false</code>인 {{jsxref("Boolean")}} 값을 반환한다. 이 메소드를 사용하여 문서내 활성화된(active) 요소가 포커스를 갖고 있는지 판단할 수 있다.</p>
+
+<div class="note">
+<p>문서를 볼 때, 포커스를 가진 요소는 언제나 문서상의 활성화된 요소이다. 반면에 활성화된 요소는 꼭 포커스를 갖지 않을 수 도 있다. 예를 들면 전면에 나와있지 않은(not a foreground) 팝업창 내의 활성화된 요소는 포커스를 갖고 있지 않다.</p>
+</div>
+
+<h2 id="Syntax" name="Syntax">구문</h2>
+
+<pre>focused = document.hasFocus();</pre>
+
+<h3 id="반환_값">반환 값</h3>
+
+<p>문서 내의 활성화된 요소가 포커스를 갖고 있지 않으면 <code>false</code>를 반환, 포커스를 갖고 있다면 <code>true</code>를 반환</p>
+
+<h2 id="Example" name="Example">예제</h2>
+
+<pre><code>&lt;!DOCTYPE html&gt;
+&lt;html lang="en"&gt;
+&lt;head&gt;
+&lt;meta charset="UTF-8" /&gt;
+&lt;title&gt;TEST&lt;/title&gt;
+&lt;style&gt;
+#message { font-weight: bold; }
+&lt;/style&gt;
+
+&lt;script&gt;
+
+setInterval( CheckPageFocus, 200 );
+
+function CheckPageFocus() {
+ var info = document.getElementById("message");
+
+ if ( document.hasFocus() ) {
+ info.innerHTML = "The document has the focus.";
+ } else {
+ info.innerHTML = "The document doesn't have the focus.";
+ }
+}
+
+function OpenWindow() {
+ window.open (
+ "http://developer.mozilla.org/",
+ "mozdev",
+ width=640,
+ height=300,
+ left=150,
+ top=260
+ );
+}
+
+&lt;/script&gt;
+&lt;/head&gt;
+
+&lt;body&gt;
+ &lt;h1&gt;JavaScript hasFocus example&lt;/h1&gt;
+ &lt;div id="message"&gt;Waiting for user action&lt;/div&gt;
+ &lt;div&gt;&lt;button onclick="OpenWindow()"&gt;Open a new window&lt;/button&gt;&lt;/div&gt;
+&lt;/body&gt;
+&lt;/html&gt;</code></pre>
+
+<h2 id="Specification" name="Specification">명세</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', 'interaction.html#dom-document-hasfocus', 'Document.hasFocus()')}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td>Initial definition</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+<p>{{Compat("api.Document.hasFocus")}}</p>
+
+<h2 id="관련_참고">관련 참고</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/ko/docs/Web/Guide/User_experience/Using_the_Page_Visibility_API">페이지 가시성 API 사용하기</a></li>
+</ul>