DOM Level 3 once proposed element.eventListenerList to get all listeners, but it is unclear whether this will make it to the final specification. Are there any examples in D&D lore (all editions) of metallic or chromatic dragons switching alignment? Event handlers attached using traditional element.onclick= handler or HTML can be retrieved trivially from the element.onclick property from script or in-debugger. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Is every finite group the outer automorphism group of a finite group? HTML allows event handler attributes, with JavaScript code, to be added to HTML elements. I'm voting this down, because in general use in any language, you are not supposed to access methods that start with and underscore. How is it secure to allow withdrawals from my bank by just giving an account number to a financial institution? Just for the sake of illustration (untested code) - this is an example of how you would 'wrap' addEventListener to have records of the registered event listeners on object itself: I was curious whether @Rolf's approach would actually work. How can I get the JS code of an existing HTML element? Listen to events of a certain type using monitorEvents(). In the United States, why aren't both legislative chambers involved in the Supreme Court confirmation process? Earth was suddenly teleported away from the sun. Stack Overflow for Teams is a private, secure spot for you and
Visual Event is an open source Javascript bookmarklet which provides debugging information about events that have been attached to DOM elements. There is no implementation in any browser today. Your answer, however, did the trick. As such we are forced to looked at the individual Javascript libraries, which typically maintain a cache of attached events (so they can later be removed and perform other useful abstractions). As such, in order for Visual Event to show events, it must be able to parse the event information out of a Javascript library. @GeorgeJempty This is JavaScript, there are no real private methods, so the use of an underscore is the developers way of telling someone using the library not to use the method. Teacher assigned a book that will be too upsetting to our child because of the anxiety she’s facing during the pandemic. Asking for help, clarification, or responding to other answers. I'll also link to a more popular discussion on this: In Opera you can use built-in Opera Dragonfly for that. What is the most efficient way to deep clone an object in JavaScript? View the event handlers which are attached to the document elements. The link is updated on each keypress and you install it just as you would with any other bookmarklet :-). Why is Olympus Mons the largest volcano in the whole solar system? Monitoring the progress of a calculation over a list. I have been searching for something like this for hours now, inside and outside Stack Overflow, and no one had given a proper answer thus far. Visual Event shows: Which elements have events attached to them; The type of events attached to an element; The … You'd also have to extend HTMLElement.prototype.removeEventListener to keep records that accurately reflect what is happening in the DOM. The original and simplest method of adding an event handler to an element is to assign a handler function to a property of the element that corresponds to an event type. But it's impossible to find a listener added using addEventListener or attachEvent unless a reference has been kept somewhere and it's made available (see comment about libraries). The short answer is that it's not possible to reliably determine all the listeners on an element just using javascript.
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