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附加组件

webNavigation.onDOMContentLoaded

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在页面中触发DOMContentLoaded 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,样式表和子帧)可能尚未被加载。

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.
filter可选

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

Chrome Edge Firefox Firefox for Android Opera
Basic support Yes Yes 45.0 48.0 33

Compatibility notes

Chrome

  • If the filter parameter is empty, Chrome matches all URLs.

Edge

  • Filtering is not supported

Firefox

  • Filtering is supported from version 50.
  • If the filter parameter is empty, Firefox raises an exception.

Firefox for Android

  • Filtering is supported from version 50.
  • If the filter parameter is empty, Firefox raises an exception.

Opera

  • If the filter parameter is empty, Opera matches all URLs.

Examples

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

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

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

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

Acknowledgements

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.

文档标签和贡献者

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 最后编辑者: xgqfrms-GitHub,