JavaScript: Remove an event listener from an element

JavaScript fundamental (ES6 Syntax): Exercise-93 with Solution

Write a JavaScript program to remove an event listener from an element.

• Use EventTarget.removeEventListener() to remove an event listener from an element.
• Omit the fourth argument opts to use false or specify it based on the options used when the event listener was added.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2
// Define the 'off' function to remove an event listener from an element.
const off = (el, evt, fn, opts = false) => el.removeEventListener(evt, fn, opts);

// Define a function 'fn' to log an exclamation mark to the console.
const fn = () => console.log('!');

// Add an event listener for 'click' events on the document body, calling the 'fn' function.
document.body.addEventListener('click', fn);

// Remove the event listener for 'click' events on the document body that calls the 'fn' function.
console.log(off(document.body, 'click', fn)); 

Output:

undefined

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-93-1 by w3resource (@w3resource) on CodePen.

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