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You can encounter “addEventListener Is Not A Function Error” In JS. Thus, we will summarize the main causes and possible solutions to eliminate this problem. Let’s get started with the helpful information below.
When will the error “Addeventlistener Is Not A Function Error” in JS happen?
This error will occur when you want to use the “addEventListener()” method on the primary element in the array.
Supposing that you are working in Javascript, here is the error “Addeventlistener Is Not A Function Error” in JS displayed on your screen.
const example_boxes = document.getElementsByClassName('box');
console.log(example_boxes);
example_boxes.addEventListener('click here', function onClick() {
console.log('clicked');
});Output:
Uncaught TypeError: example_boxes.addEventListener is not a functionWe will propose the main causes:
1. Call method on the object wrongly.
2. Do not set the script tag at the end of the ‘body’ tag.
3. Misspell the ‘addEventListener’ method.
How to fix this problem?
Solution 1: Call the ‘addEventListener()’
First, you use the ‘addEventListener()’ method on the first element within the array-like object like below.
const example_boxes = document.getElementsByClassName('box');
console.log(example_boxes);
example_boxes[0].addEventListener('click here', function onClick() {
console.log('clicked');
});
for (const box of example_boxes) {
box.addEventListener('click here', function onClick() {
console.log('clicked');
});
}From the code above, you even use ‘console.log,’ which is the element you want to call the method on. Besides, you should check carefully before implementing the ‘addEventListener’ method. In addition, test if the value is the object or consists of the property: ‘addEventListener.’
const example_box = null;
if (type of example_box === 'object' && example_box !== null && 'addEventListener' in example_box) {
example_box.addEventListener('click here', function onClick() {
console.log('clicked');
});
}You must check if the ‘box’ variable stores a value. Next, do the same thing if the variable is not ‘null.’ Finally, you check whether the object consists of the ‘addEventListener’ property or not.
After calling the ‘addEventListener’ method and running the code, the error will be removed entirely.
Solution 2: Place the JS script tag at the end of the ‘body’ tag
The following solution that you need to do is to place the JS script tag at the end of the ‘body’ tag. Because DOM can not be available and prevent JS from operating with it, resulting in other behaviors.
Let’s place the Javascript scrip tag like below.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Addeventlistener Is Not A Function Error In JS - How To Solve It</title>
</head>
<body>
<script src="example-code.js"></script>
</body>
</html>Finally, run your program, and this problem is tackled successfully.
Solution 3: Spell the ‘addEventListener’ method correctly
In this case, you only need to spell and check the ‘addEventListener’ method carefully and precisely.
Conclusion
That’s all about the “addEventListener Is Not A Function Error” In JS and three beneficial approaches you need to care for. Send your feedback to us if possible. Thanks!
Read more:
→ Cannot read Property addEventListener of Null in JS – How To Solve It?
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