Addeventlistener Javascript

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Il metodo 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.

Capture 397

The above example site image is a representation of the markup and the following JavaScript code

HTML

JavaScript

Note that when we invoke the querySelector, we are calling the .content-dest ’ when ’ .content -dest " does not exist in HTML. If we forgot to use the period on behalf of the class, we received the same error.

Debug

The value we need to choose in our JavaScript is ‚". destination content . After fixing this the error in the console goes away and we see the blue dotted border created in our event listener.

Capture 400

Conclusion

The method addEventListener is used to allow users to interact with the web page or document. Null is the absence of a value or object. when calling a selector that does not exist or forgets to include the dot in the class name or the hash symbol in the id when the n invoking the querySelector methods, we can throw the same null error.

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Addeventlistener Javascript __del__: Questions

How can I make a time delay in Python?

5 answers

I would like to know how to put a time delay in a Python script.

2973

Answer #1

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

Here is another example where something is run approximately once a minute:

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

2973

Answer #2

You can use the sleep() function in the time module. It can take a float argument for sub-second resolution.

from time import sleep
sleep(0.1) # Time in seconds

Addeventlistener Javascript __del__: Questions

How to delete a file or folder in Python?

5 answers

How do I delete a file or folder in Python?

2639

Answer #1


Path objects from the Python 3.4+ pathlib module also expose these instance methods:

We hope this article has helped you to resolve the problem. Apart from Addeventlistener Javascript, check other __del__-related topics.

Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Cornwall Krasiko

Tallinn | 2023-02-04

os Python module is always a bit confusing 😭 Addeventlistener Javascript is not the only problem I encountered. Checked yesterday, it works!

Davies Williams

Boston | 2023-02-04

Simply put and clear. Thank you for sharing. Addeventlistener Javascript and other issues with imp Python module was always my weak point 😁. I am just not quite sure it is the best method

Schneider Innsbruck

San Francisco | 2023-02-04

I was preparing for my coding interview, thanks for clarifying this - Addeventlistener Javascript in Python is not the simplest one. Will get back tomorrow with feedback

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