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+---
+title: 'Document: readystatechange イベント'
+slug: Web/API/Document/readystatechange_event
+tags:
+  - Event
+  - Reference
+  - XMLHttpRequest
+  - interactive
+translation_of: Web/API/Document/readystatechange_event
+---
+<div>{{APIRef}}</div>
+
+<p><strong><code>readystatechange</code></strong> eventは、文書の {{domxref("Document.readyState", "readyState")}} 属性が変化したときに発生します。</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">バブリング</th>
+   <td>なし</td>
+  </tr>
+  <tr>
+   <th scope="row">キャンセル</th>
+   <td>不可</td>
+  </tr>
+  <tr>
+   <th scope="row">インターフェイス</th>
+   <td>{{domxref("Event")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">イベントハンドラープロパティ</th>
+   <td><code>onreadystatechange</code></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<h3 id="Live_example" name="Live_example">ライブデモ</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div class="controls"&gt;
+  &lt;button id="reload" type="button"&gt;Reload&lt;/button&gt;
+&lt;/div&gt;
+
+&lt;div class="event-log"&gt;
+  &lt;label&gt;Event log:&lt;/label&gt;
+  &lt;textarea readonly class="event-log-contents" rows="8" cols="30"&gt;&lt;/textarea&gt;
+&lt;/div&gt;</pre>
+
+<div class="hidden">
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">body {
+  display: grid;
+  grid-template-areas: "control  log";
+}
+
+.controls {
+  grid-area: control;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.event-log {
+  grid-area: log;
+}
+
+.event-log-contents {
+  resize: none;
+}
+
+label, button {
+  display: block;
+}
+
+#reload {
+  height: 2rem;
+}
+
+</pre>
+</div>
+
+<h4 id="JS">JS</h4>
+
+<pre class="brush: js">const log = document.querySelector('.event-log-contents');
+const reload = document.querySelector('#reload');
+
+reload.addEventListener('click', () =&gt; {
+  log.textContent ='';
+  window.setTimeout(() =&gt; {
+      window.location.reload(true);
+  }, 200);
+});
+
+window.addEventListener('load', (event) =&gt; {
+    log.textContent = log.textContent + 'load\n';
+});
+
+document.addEventListener('readystatechange', (event) =&gt; {
+    log.textContent = log.textContent + `readystate: ${document.readyState}\n`;
+});
+
+document.addEventListener('DOMContentLoaded', (event) =&gt; {
+    log.textContent = log.textContent + `DOMContentLoaded\n`;
+});
+
+</pre>
+
+<h4 id="Result" name="Result">結果</h4>
+
+<p>{{ EmbedLiveSample('Live_example', '100%', '160px') }}</p>
+
+<h2 id="Specifications" name="Specifications">仕様書</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">仕様書</th>
+   <th scope="col">状態</th>
+   <th scope="col">備考</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "indices.html#event-readystatechange", "readystatechange")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<div class="hidden">このページの互換性一覧表は構造化データから生成されています。データに協力していただけるのであれば、 <a class="external" href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックアウトしてプルリクエストを送信してください。</div>
+
+<p>{{Compat("api.Document.readystatechange_event")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>関連イベント: {{domxref("Document/DOMContentLoaded_event", "DOMContentLoaded")}}, {{domxref("Window/load_event", "load")}}, {{domxref("Window/beforeunload_event", "beforeunload")}}, {{domxref("Window/unload_event", "unload")}}</li>
+</ul>