How to Remove All Event Listeners from a DOM Object in JavaScript: A Comprehensive Guide

Javascript/DOM: How to Remove All Event Listeners from a DOM Object

The question arises: how can one completely remove all events from an object, such as a div? In particular, the query pertains to an event added using per div.addEventListener('click', eventReturner(), false);.

Removing All Event Handlers

If the intent is to eliminate all event handlers (regardless of type) from an element, consider the following method:

var clone = element.cloneNode(true);

This technique preserves attributes and children without affecting DOM property modifications.

Removing Anonymous Event Handlers of a Specific Type

The alternative approach is to utilize the removeEventListener() method, but it may not work when dealing with anonymous functions. The key issue here is that calling addEventListener with an anonymous function assigns a unique listener each time the function is invoked. Consequently, attempting to remove the event handler using the same function reference has no effect.

To address this limitation, consider these two alternatives:

1. Use a Named Function:

function handler() {
     dosomething();
 }

 div.addEventListener('click',handler,false);

2. Create a Wrapper Function:

var _eventHandlers = {}; // somewhere global

const addListener = (node, event, handler, capture = false) => {
   if (!(event in _eventHandlers)) {
     _eventHandlers[event] = []
   }
   _eventHandlers[event].push({ node: node, handler: handler, capture: capture })
   node.addEventListener(event, handler, capture)
 }
...
addListener(div, 'click', eventReturner(), false)

This approach allows for the creation of a wrapper function that stores a reference to the added event listener. The corresponding removeAllListeners function can then be used to remove these handlers.

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