Listen to multiple keydowns

Question

I\'m trying to let a user move an element on the page using the arrow keys. So far, I have movement working for up/down/left/right, but not for diagonal (two arrow keys pres

Answer 1

Logically this sounds rather simple:

1. the first key triggers a key down event, store this event in a stack
2. then the second key triggers a key down event, store this event in a stack
3. now you have two key downs and no key up
4. if a key up fires you have three possibilities
   1. you have only one event => go in that direction
   2. you have two events => go diagonally
   3. you have more than two events, or an invalid option (e.g. right and left) => do nothing, or whatever you feel like
5. clear the stack