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addEventListener () viene utilizzato insieme a EventTarget, che √® un’implementazione del Document Object Model (DOM) che può ricevere eventi come clic, passaggio del mouse, invio, keydown, trascinamento e Other. Events can be thought of as a user ’s interaction with the web page or a document.
Unlike undefined value, NULL can be a value assigned for this purpose by developers in their programs. It represents the absence of a value or an object. It is a primitive and false value.
In this article, we’re going to dive into why developers might get this error while coding.
Why the error is triggered. Null
An event listener has been added to the ship image on the site below. We should see a blue dotted border around the image by clicking on it, but we get the "Unable to read property" addEventListener "property of null" error in the console.