wasd or similar

No other libraries to import, just this code in the page:

<script>

// Examples:
// keyboard.showBuffer();
// keyboard.isKeyPressed(idKey); -> parameter must be an id (number) or the name of the key
// if (keyboard.isKeyPressed(32) == true) alert("Spacebar key pressed");
// if (keyboard.isKeyPressed("spacebar") == true) alert("Spacebar key pressed");
function Keyboard(){
this.key = [];
this.functionsKeyDown = [];
this.functionsKeyUp = [];

var totalkeys = 256;
for (var i = 0; i < totalkeys; i++) this.key.push(0);

this.onkeydown = function(e){
var e = window.event || e;
var keyPressedValue = e.keyCode ? e.keyCode : e.charCode;
keyboard.key[keyPressedValue] = 1;

var functionsAdded = keyboard.functionsKeyDown.length;
for (var i = 0; i < functionsAdded; i++) keyboard.functionsKeyDown();
}
this.onkeyup = function(e){
var e = window.event || e;
var keyPressedValue = e.keyCode ? e.keyCode : e.charCode;
keyboard.key[keyPressedValue] = 0;

var functionsAdded = keyboard.functionsKeyUp.length;
for (var i = 0; i < functionsAdded; i++) keyboard.functionsKeyUp();
}
this.showBuffer = function(){
var buffer = "";
for (var i = 0; i < totalkeys; ++i)
if (keyboard.key == 1){
if (buffer == "")
buffer = i;
else
buffer = buffer + ", " + i;
}

return buffer;
}
this.isKeyPressed = function(idKey){
if (typeof(idKey) == "number"){

// Find key by id
return keyboard.key[idKey];

} else {

// Find key by name
var keyName = idKey;
idKey = 0;
if (keyName.length == 1 && keyName.toUpperCase()>='A' && keyName.toUpperCase()<='Z') {
idKey = keyName.toUpperCase().charCodeAt(0);
} else {
switch (keyName.toLowerCase()){
case "back": idKey = 8; break;
case "tab": idKey = 9; break;
case "center": idKey = 12; break;
case "enter": idKey = 13; break;
case "shift": idKey = 16; break;
case "ctrl": idKey = 17; break;
case "alt": idKey = 18; break;
case "pausa": idKey = 19; break;
case "caps": idKey = 20; break;
case "esc": idKey = 27; break;
case "spacebar": idKey = 32; break;
case "right-up": idKey = 33; break;
case "right-down": idKey = 34; break;
case "left-down": idKey = 35; break;
case "left-up": idKey = 36; break;
case "left": idKey = 37; break;
case "up": idKey = 38; break;
case "right": idKey = 39; break;
case "down": idKey = 40; break;
case "ins": idKey = 45; break;
case "canc": idKey = 46; break;
case "0": idKey = 48; break;
case "1": idKey = 49; break;
case "2": idKey = 50; break;
case "3": idKey = 51; break;
case "4": idKey = 52; break;
case "5": idKey = 53; break;
case "6": idKey = 54; break;
case "7": idKey = 55; break;
case "8": idKey = 56; break;
case "9": idKey = 57; break;
case "<": idKey = 60; break;
case "windows": idKey = 91; break;
case "0'": idKey = 96; break;
case "1'": idKey = 97; break;
case "2'": idKey = 98; break;
case "3'": idKey = 99; break;
case "4'": idKey = 100; break;
case "5'": idKey = 101; break;
case "6'": idKey = 102; break;
case "7'": idKey = 103; break;
case "8'": idKey = 104; break;
case "9'": idKey = 105; break;
case "*": idKey = 106; break;
case "+": idKey = 107; break;
case "-": idKey = 109; break;
case "/": idKey = 111; break;
case "f1": idKey = 112; break;
case "f2": idKey = 113; break;
case "f3": idKey = 114; break;
case "f4": idKey = 115; break;
case "f5": idKey = 116; break;
case "f6": idKey = 117; break;
case "f7": idKey = 118; break;
case "f8": idKey = 119; break;
case "f9": idKey = 120; break;
case "f10": idKey = 121; break;
case "f11": idKey = 122; break;
case "f12": idKey = 123; break;
case "blocnum": idKey = 144; break;
case "_": idKey = 173; break;
case ",": idKey = 188; break;
case ".": idKey = 190; break;
case "|": idKey = 220; break;
default : break;
}
}
return keyboard.key[idKey];
}
}
}
var keyboard = new Keyboard();
document.onkeydown = keyboard.onkeydown;
document.onkeyup = keyboard.onkeyup;

keyboard.functionsKeyDown.push(function() {

// W A S D
if (keyboard.isKeyPressed("w") == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=n";
if (keyboard.isKeyPressed("a") == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=w";
if (keyboard.isKeyPressed("s") == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=s";
if (keyboard.isKeyPressed("d") == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=e";

// with bloc num active
if (keyboard.isKeyPressed(104) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=n";
if (keyboard.isKeyPressed(100) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=w";
if (keyboard.isKeyPressed(98) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=s";
if (keyboard.isKeyPressed(102) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=e";
if (keyboard.isKeyPressed(103) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=nw";
if (keyboard.isKeyPressed(105) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=ne";
if (keyboard.isKeyPressed(97) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=sw";
if (keyboard.isKeyPressed(99) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=se";

// with bloc num not active
if (keyboard.isKeyPressed(38) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=n";
if (keyboard.isKeyPressed(37) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=w";
if (keyboard.isKeyPressed(40) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=s";
if (keyboard.isKeyPressed(39) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=e";
if (keyboard.isKeyPressed(36) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=nw";
if (keyboard.isKeyPressed(33) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=ne";
if (keyboard.isKeyPressed(35) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=sw";
if (keyboard.isKeyPressed(34) == true) location.href = "https://www.agonialands.com/hydre/prophets/main.php?action=move&dir=se";

});


</script>



PS: the bbcode is breaking the code, i put it temporary in a txt file: wasd.txt