To detect Ctrl+V, Ctrl+C using JavaScript, we listen for keypresses on the window.
For instance, we write
window.onkeypress = (evt) => {
const c = evt.keyCode;
const ctrlDown = evt.ctrlKey || evt.metaKey;
if (ctrlDown && evt.altKey) {
return true;
} else if (ctrlDown && c === 67) {
// c
return false;
} else if (ctrlDown && c === 86) {
// v
return false;
} else if (ctrlDown && c === 88) {
// x
return false;
}
return true;
};
to set window.onkeypress to a function that checks for various keys.
We check for ctrl or meta key press with evt.ctrlKey || evt.metaKey.
And then we check for keyCode for the 2nd key if ctrlDown is true.
If keyCode is 67, then c is pressed.
If keyCode is 86, then v is pressed.
If keyCode is 88, then x is pressed.
We return false if any of those are true to stop the behavior of copy and paste.
Otherwise, we return true.
