Javascript not getting keyDown input
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by William
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Published on 2010-06-13T19:49:35Z
Indexed on
2010/06/13
19:52 UTC
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For some reason my code just isn't wanting to fire off any kind of OnKeyDown event. I don't know why. Can anyone tell me what I'm doing wrong?
<!DOCTYPE html>
<html lang="en">
<head>
<title>Canvas test</title>
<meta charset="utf-8" />
<link href="/bms/style.css" rel="stylesheet" />
<style>
body { text-align: center; background-color: #000000;}
canvas{ background-color: #ffffff;}
</style>
<script type="text/javascript">
var x = 50;
var y = 250;
var speed = 5;
function controls(event){
if(!e){
//for IE
e = window.event;
}
if(e.keyCode==37){//keyCode 37 is left arrow
x -= speed;
}
if(e.keyCode==39){ //keyCode 39 is right arrow
x += speed;
}
if(e.keyCode==38){//keyCode 37 is up arrow
y -= speed;
}
if(e.keyCode==40){ //keyCode 39 is down arrow
y += speed;
}
}
function update(){
document.onkeydown="controls(event);";
draw();
}
function draw(){
var canvas = document.getElementById('screen1');
if (canvas.getContext){
var ctx = canvas.getContext('2d');
ctx.fillStyle = 'rgba(255,255,255,0.5)';
ctx.fillRect(0,0,500,500);
ctx.fillStyle = 'rgb(236,138,68)';
ctx.fillRect(x,y,25,25);
}
}
setInterval('update();', 1000/60);
</script>
</head>
<body>
<canvas id="screen1" width="500" height="500"></canvas>
</body>
</html>
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