Why my code(above) is not supported in SoloLearn? But it works on Microsoft edge and other browsers.

Question

https://code.sololearn.com/WGeqJWb40EHA/?ref=app

Answer 1

For the loading issue we can control it by two methods
1)create onload attribute to body element
2)use windows.onload event

These are pointed in Solo Learn app.
Java script->DOM & events->Handling events.

Answer 2

https://code.sololearn.com/WmVYVkveee97/?ref=app

Answer 3

marina enclose your Chang variable in a window.onload function😉

Answer 4

I think sololearn web is not exactly like a fully functional browser. Try to use an onload event attribute on you body tag, and to run all the js code inside a function that you call from the onload event.
it works for me fine like that :)

Answer 5

The problem is it runs before body is loaded so the getElementById returns null. I use a onload attribute to my body tags to avoid that problem.

Answer 6

Thanks for all answers ☺

Answer 7

Thanks for your explanation @John Wells ☺

Answer 8

Thanks also @Uria ☺ ☺

Answer 9

Above code was deleted mistakenly...Sorry for inconvenience.Bt modified one is saved in my codes which is inserted with window.onload function