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+---
+title: XMLHttpRequest.onreadystatechange
+slug: Web/API/XMLHttpRequest/onreadystatechange
+translation_of: Web/API/XMLHttpRequest/onreadystatechange
+---
+<div>{{APIRef}}</div>
+
+<p>An <a href="/docs/Web/API/EventHandler" title="A possible way to get notified of Events of a particular type (such as click) for a given object is to specify an event handler using:"><code>EventHandler</code></a> that is called whenever the <code>readyState</code> attribute changes. The callback is called from the user interface thread. The <strong><code>XMLHttpRequest.onreadystatechange</code></strong> property contains the event handler to be called when the {{event("readystatechange")}} event is fired, that is every time the {{domxref("XMLHttpRequest.readyState", "readyState")}} property of the {{domxref("XMLHttpRequest")}} changes.</p>
+
+<div class="warning">
+<p><strong>Warning:</strong> This should not be used with synchronous requests and must not be used from native code.</p>
+</div>
+
+<p>The <code>readystatechange</code> event will not be fired when an <code>XMLHttpRequest</code> request is cancelled with the <a href="/docs/Web/API/XMLHttpRequest/abort">abort()</a> method.</p>
+
+<div class="note">
+<p>UPDATE: it's firing in the latest version of browsers (Firefox 51.0.1, Opera 43.0.2442.991, Safari 10.0.3 (12602.4.8), Chrome 54.0.2840.71, Edge, IE11). Example <a href="https://jsfiddle.net/merksam/ve5oc0gn/">here</a> - just reaload page few times.</p>
+</div>
+
+<h2 id="Syntax" name="Syntax">語法</h2>
+
+<pre class="syntaxbox"><em>XMLHttpRequest</em>.onreadystatechange = <em>callback</em>;</pre>
+
+<h3 id="值">值</h3>
+
+<ul>
+ <li><code><em>callback</em></code> is the function to be executed when the <code>readyState</code> changes.</li>
+</ul>
+
+<h2 id="Example" name="Example">範例</h2>
+
+<pre class="brush: js">var xhr = new XMLHttpRequest(),
+    method = "GET",
+    url = "https://developer.mozilla.org/";
+
+xhr.open(<em>method</em>, <em>url</em>, true);
+xhr.onreadystatechange = function () {
+        if(xhr.readyState === XMLHttpRequest.DONE &amp;&amp; xhr.status === 200) {
+            console.log(xhr.responseText);
+        }
+    };
+xhr.send();</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('XMLHttpRequest', '#handler-xhr-onreadystatechange')}}</td>
+   <td>{{Spec2('XMLHttpRequest')}}</td>
+   <td>WHATWG living standard</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(1)}}</td>
+   <td>{{CompatGeckoDesktop(1.0)}}</td>
+   <td>{{CompatIe(7)}}<sup>[1]</sup></td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatSafari(1.2)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>1.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Internet Explorer version 5 and 6 supported ajax calls using <code>ActiveXObject()</code>.</p>