webNavigation.onDOMContentLoaded

Fired when the DOMContentLoaded event is fired in the page. At this point the document is loaded and parsed, and the DOM is fully constructed, but linked resources such as images, stylesheets and subframes may not yet be loaded.

Syntax

browser.webNavigation.onDOMContentLoaded.addListener(
  listener,                   // function
  filter                      // optional object
)
browser.webNavigation.onDOMContentLoaded.removeListener(listener)
browser.webNavigation.onDOMContentLoaded.hasListener(listener)

Events have three functions:

addListener(callback)
Adds a listener to this event.
removeListener(listener)
Stop listening to this event. The listener argument is the listener to remove.
hasListener(listener)
Check whether listener is registered for this event. Returns true if it is listening, false otherwise.

addListener syntax

Parameters

callback

Function that will be called when this event occurs. The function will be passed the following arguments:

details
object. Details about the navigation event.
filterOptional

object. An object containing a single property url, which is an Array of events.UrlFilter objects. If you include this parameter, then the event will fire only for transitions to URLs which match at least one UrlFilter in the array. If you omit this parameter, the event will fire for all transitions.

Additional objects

details

tabId
integer. The ID of the tab in which the navigation has occurred.
url
string. The URL to which the given frame has navigated.
processId
integer. The ID of the process in which this tab is being rendered.
frameId
integer. Frame in which the navigation is occurring. 0 indicates that navigation happens in the tab's top-level browsing context, not in a nested <iframe>. A positive value indicates that navigation happens in a nested iframe. Frame IDs are unique for a given tab and process.
timeStamp
number. The time at which DOMContentLoaded was fired, in milliseconds since the epoch.

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
onDOMContentLoaded
Yes
If the filter parameter is empty, Chrome matches all URLs.
14
Filtering is not supported.
45
["Filtering is supported from version 50.", "If the filter parameter is empty, Firefox raises an exception."]
?
17
If the filter parameter is empty, Opera matches all URLs.
14
If the filter parameter is empty, Safari matches all URLs.
?
?
48
["Filtering is supported from version 50.", "If the filter parameter is empty, Firefox raises an exception."]
?
?
?

Examples

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

const filter = {
  url:
  [
    {hostContains: "example.com"},
    {hostPrefix: "developer"}
  ]
}

function logOnDOMContentLoaded(details) {
  console.log(`onDOMContentLoaded: ${details.url}`);
}

browser.webNavigation.onDOMContentLoaded.addListener(logOnDOMContentLoaded, filter);

Note: This API is based on Chromium's chrome.webNavigation API. This documentation is derived from web_navigation.json in the Chromium code.

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

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webNavigation/onDOMContentLoaded