const disabledKeys = ["c", "C", "x", "J", "u", "I"]; // keys that will be disabled
const showAlert = e => {
e.preventDefault(); // preventing its default behaviour
return alert("Sorry, you can't view or copy source codes this way!");
}
document.addEventListener("contextmenu", e => {
showAlert(e); // calling showAlert() function on mouse right click
});
document.addEventListener("keydown", e => {
// calling showAlert() function, if the pressed key matched to disabled keys
if((e.ctrlKey && disabledKeys.includes(e.key)) || e.key === "F12") {
showAlert(e);
}
});