Explaining and Solving 'Cannot read property addEventListener of null'

This video aims at answering questions of 형빈 to my video.

Basic Web Development Environment
- VS Code with Live Server Extension
- - Light-weighted, means fast
- - Hot refresh - no need to save and refresh

Cannot read property addEventListener of undefined
- Variable declared but not initialize

Cannot read property addEventListener of null
- Get element function fails because the script runs before the element exists

[slimjimhelper]

Thank you so much! This helped me with my coursework. I was struggling to see the problem. Thank you again!!

[FranciscoGutierrez-ystt]

Recently started codding in JavaScript and this video helped me a lot! Thank you

[nathanielloueferandez]

Thank you very much! You helped me fix my problem!

[jameskillian]

you literally solved my problem. Thank You

[asharudheenkp]

thanks for the video its really helped

[thiagobeltramidiasbatista]

Thanks man... 2 hours trying to figure out what was happening.

[Will-xlxp]

I’m creating a new parent node and adding a button to that node then And add event listener to the button. When I consolelog the line afterto the button node- it shows the node exists. But right away- the following line, where I add event Listener it shows this null error

[mathiasmatanda]

Hi I have consoled my selected input element and saw it in the console.log but when adding .value to get the value in the input it just blanc

[leiryj.]

I tried to solve it but I couldn't, it keeps giving an error. I don't know how I can fix it

[yardenkerman]

I have applied all your tips to solve this problem but it still writes "Cannot read property addEventListener of null". What can i do?