How to fix Cannot read property 'addEventListener' of undefined Error in JavaScript?

Cannot read property 'addEventListener' of undefined is the most frequent error we see when developing a client-side application with the help of JavaScript. Fixing this error requires you to understand further this error. So it's first important to know what causes this error. Actually, It occurs when your script code calls an external function that has not been defined in your code. This is caused due to improper use of the development tools. Here we have listed some useful steps to solve this problem:

 

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Uncaught TypeError: Cannot read property 'addEventListener' of undefined

By Blue_kingBlue_king on Jan 27, 2021 
1)Check you placed .before the class
Example:
document.getElementsByClassName('.yourclassname') //.before class name is wrong
the code should be document.getElementsByClassName('yourclassname');
2)Check the spelling for addEventListener 
///dont feel embrassed because i always do these mistakes eventhough i used this property it 10000 times

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The most common cause of the above error is usually a conflict between jQuery and another JavaScript library on that page. Try the code mentioned above.

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