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+---
+title: Can I use an arrow function as the callback for an event listener in JavaScript?
+type: question
+tags: javascript,browser,event,function
+authors: chalarangelo
+cover: blog_images/arrow-functions.jpg
+excerpt: Learn the differences between JavaScript ES6 arrow functions and regular functions and how they affect event listener callbacks.
+---
+
+**Arrow functions**
+
+JavaScript ES6 introduced the concept of arrow functions, a new way to define and write functions. While they might seem like a syntactic sugar on top of regular functions, they have a key difference which lies in the way the `this` context is bound. I will not go into a lot of detail in this article, however I strongly suggest you read [Understanding the "this" keyword in JavaScript](/blog/s/javascript-this) before continuing. To summarize what the afforementioned blog post explains in more detail:
+
+> Arrow functions do not have their own bindings for `this`, resulting in `this` retaining the value of the enclosing lexical context's `this`.
+
+**Event listener callbacks**
+
+One task that we often perform when writing browser-side JavaScript is creating event listeners. For example:
+
+```js
+const toggleElements = document.querySelectorAll('.toggle');
+toggleElements.forEach(el => {
+  el.addEventListener('click', function() {
+    this.classList.toggle('active');
+  });
+});
+```
+
+In the example above, we use `NodeList.prototype.forEach()` to iterate over the nodes matching a given selector and `EventTarget.addEventListener()` with a regular function as the callback for the `'click'` event to swap between an active and inactive state for the clicked element. As we are using a regular function, the `this` context inside the callback will be bound to the element on which the event was fired.
+
+**Arrow functions as callbacks**
+
+As we have already explained, arrow functions do not have their own bindings for `this`. So what happens if we convert the previous code snippet's callback to an arrow function? Its `this` context refers to the global one, which in this case is the `window` object.
+
+```js
+const toggleElements = document.querySelectorAll('.toggle');
+toggleElements.forEach(el => {
+  el.addEventListener('click', () => {
+    this.classList.toggle('active'); // `this` refers to `window`
+    // Error: Cannot read property 'toggle' of undefined
+  });
+});
+```
+
+This code will throw an error anytime the matching element is clicked, firing the event listener and executing the callback, due to the `window` object not having a `classList` property. Oftentimes, however, the code could fail silently as it might for example check for a condition that always evaluates to `false` for `window` while it should evaluate to `true` for a given element, resulting in many headaches and wasted hours until the issue is discovered and fixed.
+
+To deal with this, one could simply use the first argument of the callback function and `Event.target` or `Event.currentTarget` depending on their needs:
+
+```js
+const toggleElements = document.querySelectorAll('.toggle');
+toggleElements.forEach(el => {
+  el.addEventListener('click', (e) => {
+    e.currentTarget.classList.toggle('active'); // works correctly
+  });
+});
+```
+
+**Image credit:** [Matthew Smith](https://unsplash.com/@whale?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText) on [Unsplash](https://unsplash.com/s/photos/code?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText)