erorr cardId is not defined

Question

why cardId is defined what is wrong with my script help me to solve this erorr
https://code.sololearn.com/WwPdIuRf9qB5/?ref=app

Answer 1

when you set the wrapping to "onLoad" the functions you define are only defined inside that block, and cannot be accessed by outside event handlers.

to fix this, change:
function cardHide() {......}
to
window.cardHide = function() {....}

Answer 2

ok thanks i just found out about this thanks Mohamed ELomari

Answer 3

remove the parentheses from cardHide inside the addEventListener method

Answer 4

Mohamed ELomari ok thanks for success oh yes i want to ask again if i give event click in attribute so onclick = cardHide () why always erorr and the function named cardHide is defined why it can happen like this
https://code.sololearn.com/WwPdIuRf9qB5/?ref=app