---
title: readystatechange
slug: Web/Events/readystatechange
translation_of: Web/API/Document/readystatechange_event
---
<p>{{ApiRef}}</p>

<p>O evento <code>readystatechange</code> é ativado quando o atributo <a href="https://developer.mozilla.org/pt-BR/docs/Web/API/Document/readyState"><code>readyState</code></a> de um documento é alterado.</p>

<h2 id="Informações_gerais">Informações gerais</h2>

<dl>
 <dt style="float: left; text-align: right; width: 120px;">Especificação</dt>
 <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/dom.html#current-document-readiness">HTML5</a></dd>
 <dt style="float: left; text-align: right; width: 120px;">Interface</dt>
 <dd style="margin: 0 0 0 120px;">Event</dd>
 <dt style="float: left; text-align: right; width: 120px;">Propaga</dt>
 <dd style="margin: 0 0 0 120px;">Não</dd>
 <dt style="float: left; text-align: right; width: 120px;">Cancelável</dt>
 <dd style="margin: 0 0 0 120px;">Não</dd>
 <dt style="float: left; text-align: right; width: 120px;">Alvo</dt>
 <dd style="margin: 0 0 0 120px;">Document</dd>
 <dt style="float: left; text-align: right; width: 120px;">Ação Padrão</dt>
 <dd style="margin: 0 0 0 120px;">Nenhuma.</dd>
</dl>

<h2 id="Propriedades">Propriedades</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Property</th>
   <th scope="col">Type</th>
   <th scope="col">Description</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>target</code> {{readonlyInline}}</td>
   <td>{{domxref("EventTarget")}}</td>
   <td>The event target (the topmost target in the DOM tree).</td>
  </tr>
  <tr>
   <td><code>type</code> {{readonlyInline}}</td>
   <td>{{domxref("DOMString")}}</td>
   <td>The type of event.</td>
  </tr>
  <tr>
   <td><code>bubbles</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>Whether the event normally bubbles or not.</td>
  </tr>
  <tr>
   <td><code>cancelable</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>Whether the event is cancellable or not.</td>
  </tr>
 </tbody>
</table>

<h2 id="Exemplo">Exemplo</h2>

<pre class="brush: js">// alternativa ao DOMContentLoaded
document.onreadystatechange = function () {
    if (document.readyState == "interactive") {
        initApplication();
    }
}
</pre>

<h2 id="Compatibilidade_entre_Navegadores">Compatibilidade entre Navegadores</h2>

<p>Este evento tem sido suportado pelo Internet Explorer há várias versões, e pode ser usada como uma alternativa para o evento <a href="/en-US/docs/Mozilla_event_reference/DOMContentLoaded_(event)"><code>DOMContentLoaded</code></a> (veja a seção <a href="/pt-BR/docs/Web/Events/DOMContentLoaded#Cross-browser_fallback">cross-browser fallback</a>).</p>

<h2 id="Eventos_Relacionados">Eventos Relacionados</h2>

<ul>
 <li>{{event("DOMContentLoaded")}}</li>
 <li>{{event("readystatechange")}}</li>
 <li>{{event("load")}}</li>
 <li>{{event("beforeunload")}}</li>
 <li>{{event("unload")}}</li>
</ul>