---
title: webNavigation.onDOMContentLoaded
slug: Mozilla/Add-ons/WebExtensions/API/webNavigation/onDOMContentLoaded
tags:
  - API
  - onDOMContentLoaded
  - webNavigation
  - webNavigation.onDOMContentLoaded
translation_of: Mozilla/Add-ons/WebExtensions/API/webNavigation/onDOMContentLoaded
---
<div>{{AddonSidebar()}}</div>

<p>在页面中触发<a href="/en-US/docs/Web/Events/DOMContentLoaded">DOMContentLoaded</a> 事件时触发。此时，文档被加载和解析，并且DOM被完全构造，但链接的资源（例如图像，样式表和子框架（subframes））可能尚未被加载。</p>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox brush:js">browser.webNavigation.onDOMContentLoaded.addListener(
  listener,                   // function
  filter                      // optional object
)
browser.webNavigation.onDOMContentLoaded.removeListener(listener)
browser.webNavigation.onDOMContentLoaded.hasListener(listener)
</pre>

<p>事件有三个方法:</p>

<dl>
 <dt><code>addListener(callback)</code></dt>
 <dd>为此事件添加监听方法.</dd>
 <dt><code>removeListener(listener)</code></dt>
 <dd>停止监听此事件. <code>listener</code> 参数为需要移出的监听方法.</dd>
 <dt><code>hasListener(listener)</code></dt>
 <dd>检测是否有 <code>listener</code> 被注册在事件上. 如果有返回 <code>true</code> , 否则返回<code>false</code> .</dd>
</dl>

<h2 id="addListener_syntax">addListener syntax</h2>

<h3 id="参数">参数</h3>

<dl>
 <dt><code>callback</code></dt>
 <dd>
 <p>为当此事件发生是需要被调用的函数. 该函数将传递以下参数:</p>

 <dl class="reference-values">
  <dt><code>details</code></dt>
  <dd><a href="#details"><code>object</code></a>. 有关导航（navigation）事件的详细信息.</dd>
 </dl>
 </dd>
 <dt><code>filter</code>{{optional_inline}}</dt>
 <dd>
 <p><code>object</code>. 包含单个属性 <code>url</code> 的对象,  这是一个  {{WebExtAPIRef("events.UrlFilter")}} <font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">数组</span></font>对象. 如果包含此参数，则该事件将仅触发转换为与数组中至少一个<code>UrlFilter</code>匹配的URL。 在数组中。如果您省略此参数，则该事件将触发所有转换。</p>
 </dd>
</dl>

<h2 id="Additional_objects">Additional objects</h2>

<h3 id="details">details</h3>

<dl class="reference-values">
 <dt><code>tabId</code></dt>
 <dd><code>integer</code>. The ID of the tab in which the navigation has occurred.</dd>
 <dt><code>url</code></dt>
 <dd><code>string</code>. The URL to which the given frame has navigated.</dd>
 <dt><code>processId</code></dt>
 <dd><code>integer</code>. The ID of the process in which this tab is being rendered.</dd>
 <dt><code>frameId</code></dt>
 <dd><code>integer</code>. Frame in which the navigation is occurring. 0 indicates that navigation happens in the tab's top-level browsing context, not in a nested <a href="/en-US/docs/Web/HTML/Element/iframe">iframe</a>. A positive value indicates that navigation happens in a nested iframe. Frame IDs are unique for a given tab and process.</dd>
 <dt><code>timeStamp</code></dt>
 <dd><code>number</code>. The time at which <code>DOMContentLoaded</code> was fired, in <a href="https://en.wikipedia.org/wiki/Unix_time">milliseconds since the epoch</a>.</dd>
</dl>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>

<p>{{Compat("webextensions.api.webNavigation.onDOMContentLoaded")}}</p>

<h2 id="Examples">Examples</h2>

<p>Logs the target URLs for <code>onDOMContentLoaded</code>, if the target URL's hostname contains "example.com" or starts with "developer".</p>

<pre class="brush: js">var filter = {
  url:
  [
    {hostContains: "example.com"},
    {hostPrefix: "developer"}
  ]
}

function logOnDOMContentLoaded(details) {
  console.log("onDOMContentLoaded: " + details.url);
}

browser.webNavigation.<code>onDOMContentLoaded</code>.addListener(logOnDOMContentLoaded, filter);

</pre>

<p>{{WebExtExamples}}</p>

<div class="note"><strong>Acknowledgements</strong>

<p>This API is based on Chromium's <a href="https://developer.chrome.com/extensions/webNavigation#event-onBeforeNavigate"><code>chrome.webNavigation</code></a> API. This documentation is derived from <a href="https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/web_navigation.json"><code>web_navigation.json</code></a> in the Chromium code.</p>

<p>Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.</p>
</div>

<div class="hidden">
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</pre>
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