Keyboard input using socket.io - socket.io

Question

At the moment I have been able to get the sprite to move using the mouse but I am stuck on getting it to move using the keyboard
Client code shortened:
var Client = {};
Client.socket = io.connect();
Client.sendClick = function(x,y){
Client.socket.emit('click',{x:x,y:y});
};
Client.socket.on('move',function(data){
Game.movePlayer(data.id,data.x,data.y);
});
Server code shortened:
socket.on('click',function(data){
console.log('click to '+data.x+', '+data.y);
socket.player.x = data.x;
socket.player.y = data.y;
io.emit('move',socket.player);
});
I've tried something along these lines
Client.sendKey = function(data){
switch(data.keyCode)
{
case 40:
Client.socket.emit('movement', data.y - 10);
break;
case 38:
Client.socket.emit('movement', data.y + 10);
break;
case 37:
Client.socket.emit('movement', data.x - 10);
break;
case 39:
Client.socket.emit('movement', data.x + 10);
break;
}
});

Answer 1

This would be an example of how to handle keycodes within a game loop scenario and could also be malleable if you are not using this as part of a game. I'm also presuming your using JavaScript, though if I'm wrong I'll remove this answer.
//keys array
var keys = [];
//Bind document event listeners
document.addEventListener('keyup', keyUp);
document.addEventListener('keydown', keyDown);
function moveClient(KeyCodeArr) {
//if a key code is true then it means the key has been pressed.
if (KeyCodeArr[40]) {
Client.socket.emit('movement', data.y - 10);
}
if (KeyCodeArr[38]) {
Client.socket.emit('movement', data.y + 10);
}
if (KeyCodeArr[37]) {
Client.socket.emit('movement', data.x - 10);
}
if (KeyCodeArr[39]) {
Client.socket.emit('movement', data.x + 10);
}
}
/**
* These two events handle
*/
//key down event for use with listener
function keyDown(event) {
keys[event.keyCode] = true;
}
//key up event for use with event listener
function keyUp(event) {
keys[event.keyCode] = false;
}
//main in this example would be a game loop.
function main() {
moveClient();
}