Fired when a navigation is about to occur.
Syntax
browser.webNavigation.onBeforeNavigate.addListener(function(
details // object
) {...})
browser.webNavigation.onBeforeNavigate.removeListener(listener)
browser.webNavigation.onBeforeNavigate.hasListener(listener)
Events have three functions:
addListener(callback)- Adds a listener to this event.
removeListener(listener)- Stop listening to this event. The
listenerargument is the listener to remove. hasListener(listener)- Check whether
listeneris registered for this event. Returnstrueif it is listening,falseotherwise.
addListener syntax
Parameters
callback-
Function that will be called when this event occurs. The function will be passed the following arguments:
detailsobject.
Additional objects
details
tabIdinteger. The ID of the tab in which the navigation is about to occur.urlstring.processIdinteger. The ID of the process runs the renderer for this tab.frameIdinteger. 0 indicates the navigation happens in the tab content window; a positive value indicates navigation in a subframe. Frame IDs are unique for a given tab and process.parentFrameIdinteger. ID of frame that wraps the frame. Set to -1 of no parent frame exists.timeStampnumber. The time when the browser was about to start the navigation, in milliseconds since the epoch.
Browser compatibility
Examples
Acknowledgements
This API is based on Chromium's chrome.webNavigation API. This documentation is derived from web_navigation.json in the Chromium code.
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