I have ran into a bit of a problem when attempting to detect which arrow keys some one has presses.
No matter what I use, I end up with NULL being returned for arrow keys - here is the bit of the code were I get what key is presses.
function key(){
// This works for keys, but not arrows
document.onkeypress=function(e){
var e=window.event || e
alert("CharCode value: " + e.charCode + "\nCharacter: " + String.fromCharCode(e.charCode) )
}
// This returns NULL for everything
document.onkeydown=function(e){
var e=window.event || e
alert("CharCode value: " + e.charCode + "\nCharacter: " + String.fromCharCode(e.charCode) )
}
}
.
Here is a working code example I threw together to demonstrate the issue. It is not complete, but it gets the job done to point out my issue ...
.
<html>
<center>
<canvas id="x" width="500" height="500" style="border:1px solid #000000;"></canvas>
</center>
<script>
var c=document.getElementById("x");
var ctx=c.getContext("2d");
var FPS = 30;
setInterval(function(){
update();
draw();
},1000/FPS);
function update(){
key();
}
function draw(){
ctx.clearRect(0,0,500,500);
}
function key(){
// This works for keys, but not arrows
document.onkeypress=function(e){
var e=window.event || e
alert("** Test 1 ** \nCharCode value: " + e.charCode + "\nCharacter: " + String.fromCharCode(e.charCode) )
}
// This returns NULL for everything
document.onkeydown=function(e){
var e=window.event || e
alert("** Test 2 ** \nCharCode value: " + e.charCode + "\nCharacter: " + String.fromCharCode(e.charCode) )
}
}
</script>
</html>
