How do you fix addEventListener is not a function?

How do you fix addEventListener is not a function?

So you are trying to use the method addEventListener() on the array when you need to use the method addEventListener() on the actual element within the array. You need to return an element not an array by accessing the element within the array so the var comment itself is assigned an element not an array.

What is querySelectorAll in JavaScript?

querySelectorAll() The Document method querySelectorAll() returns a static (not live) NodeList representing a list of the document’s elements that match the specified group of selectors.

What does document querySelectorAll return?

The Document method querySelector() returns the first Element within the document that matches the specified selector, or group of selectors. If no matches are found, null is returned.

How do you use addEventListener in react?

Adding an Event Listener

1. You can create an event listener in a React app by using the window.addEventListener method, just like you would in a vanilla Javascript app:
2. The code snippet above shows you how to add a keydown event listener to the window.
3. To solve the first issue you will need to use the useEffect hook.

What is the use of querySelectorAll?

The querySelector() method in HTML is used to return the first element that matches a specified CSS selector(s) in the document. Note: The querySelector() method only returns first element that match the specified selectors. To return all the matches, use querySelectorAll() method. Selectors are the required field.

What does a NodeList contain?

A NodeList is a collection of document nodes. A NodeList and an HTML collection is very much the same thing. Both an HTMLCollection object and a NodeList object is an array-like list (collection) of objects. Both have a length property defining the number of items in the list (collection).

Does querySelectorAll return in order?

The querySelectorAll() methods on the Document , DocumentFragment , and Element interfaces must return a NodeList containing all of the matching Element nodes within the subtrees of the context node, in document order. If there are no matching nodes, the method must return an empty NodeList .

Can I use addEventListener on querySelectorAll?

addEventListener on a querySelectorAll() with classList const cbox = document. querySelectorAll(“. box”); function doit() { for (let i = 0; i < cbox. length; i++){ cbox[i].

How do you add an event listener to all elements of an array?

To add the event listener to the multiple elements, first we need to access the multiple elements with the same class name or id using document. querySelectorAll() method then we need to loop through each element using the forEach() method and add an event listener to it.

How to add an addEventListener to a JavaScript function?

I’m creating a Chrome Extension, and the way JavaScript functions are handled is slightly different; I can’t just call the function, it has to have an addEventListener () on it. I’m using vanilla/plain JavaScript. I’m trying to add the addEventListener () to several things at once, so I tried:

How to add an addEventListener in CBOX?

There are some dissimilarities between the code and the link you have provided. There is no function doit () in there. You have attached addEvenListener to the NodeList in cbox.addEventListener (“click”,….. You can use forEach on the class or use Event delegation. Notice that I changed your variable name.

How to add event listener to all elements?

If you want to add event listener to all the elements, then you will need to loop through them document.getElementsByClassName returns an array of elements. so may be you want to target a specific index of them: var comment = document.getElementsByClassName (‘button’) [0]; should get you what you want.

What does the document queryselectorall ( ) do?

The Document method querySelectorAll() returns a static (not live) NodeList representing a list of the document’s elements that match the specified group of selectors.