How to Remove All Event Listeners from a DOM Object in JavaScript?

How to Remove All Event Listeners of a DOM Object in Javascript/DOM

Introduction

Javascript provides various methods for adding and removing event listeners to DOM objects. However, it can be challenging to understand how to remove all event listeners attached to an object.

Remove All Event Handlers

To remove all event handlers from any object, you can use the following approach:

<code class="javascript">const clone = element.cloneNode(true);</code>

This method preserves attributes and children, but it does not preserve any changes to DOM properties.

Remove Anonymous Event Handlers for Specific Event Types

Anonymous event handlers are created when a function is used as a callback during event listener registration without assigning a name to the function. These handlers cannot be removed using removeEventListener().

To handle this scenario, you can either:

1. Use the function directly instead of returning a function:

<code class="javascript">function handler() {
  dosomething();
}

div.addEventListener('click', handler, false);</code>

2. Create a wrapper function that stores a reference to the anonymous function and use it with custom addEventListener() and removeAllListeners() functions:

<code class="javascript">const addListener = (node, event, handler, capture = false) => {
  // Store references to handlers and nodes
  // ...
  node.addEventListener(event, handler, capture);
};

const removeAllListeners = (targetNode, event) => {
  // Remove listeners from specified nodes
  // ...
};</code>

Usage

<code class="javascript">addListener(div, 'click', eventReturner(), false);
// ...
removeAllListeners(div, 'click');</code>

Note:

Ensure to remove event handler references from the _eventHandlers global variable when destroying objects to prevent memory leaks.

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