A javascript error

Question

I have been working on an image editor and it worked fine on my laptop but when i upload it here it gives an error can anyone tell me what is wrong with it
https://code.sololearn.com/WQqmPZ46NFUt/?ref=app

Answer 1

It's the usual problem here of JavaScript running before the HTML is fully loaded.
To fix it, simply encase everything in the JavaScript tab within:

window.onload = function(){

All of your current JavaScript here

}

That will cause the JavaScript to not run until the HTML is fully loaded and so fixes that error.

Answer 2

Thank you man it works 👍

Answer 3

I know the code might look annoying but its my first try in JavaScript