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I have a page where some event listeners are attached to input boxes and select boxes. Is there a way to find out which event listeners are observing a particular DOM node and for what event?
Events are attached using:
Event.observe;addEventListener;element.onclick.
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Its stored in the actual list (array) of Event listeners for body . Elements have a list of function references in them for their event listeners. These references are not in the DOM. When firing an event, the browser has to run thru all the appropriate elements looking for these references and running them in order.
To check whether dynamically attached event listener exists or not with JavaScript, we can get and set the element's listener attribute. export const attachEvent = ( element: Element, eventName: string, callback: () => void ) => { if (element && eventName && element. getAttribute("listener") !== "true") { element.
If you just need to inspect what's happening on a page, you might try the Visual Event bookmarklet.
Update: Visual Event 2 available.
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