Error pos[...] Null or not an object. EEK!

mattal999 · September 26, 2007

hi,

i get an error message sometimes, when the car has gone to the finish line: "'pos[...]' is null or not an object?"

my code now:

<html>

<head>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>New Page 1</title>
<script language="JavaScript">
pos = new Array();
pos[0] = "60,60";
pos[1] = "65,60";
pos[2] = "70,60";
pos[3] = "75,60";
pos[4] = "80,60";
pos[5] = "85,60";
pos[6] = "90,60";
pos[7] = "95,60";
pos[8] = "100,60";
pos[9] = "105,60";
pos[10] = "110,60";
pos[11] = "115,60";
pos[12] = "120,60";
pos[13] = "125,60";
pos[14] = "130,60";
pos[15] = "135,60";
pos[16] = "140,60";
pos[17] = "145,60";
pos[18] = "160,60";
pos[19] = "165,60";
pos[20] = "170,60";
pos[21] = "175,60";
pos[22] = "180,60";
pos[23] = "185,60";
pos[24] = "190,60";
pos[25] = "195,60";
pos[26] = "200,60";
pos[27] = "205,60";
pos[28] = "210,60";
pos[29] = "215,60";
pos[30] = "220,60";
pos[31] = "225,60";
pos[32] = "230,60";
pos[33] = "235,60";
pos[34] = "240,60";
pos[35] = "245,60";
pos[36] = "250,60";
pos[37] = "255,60";
pos[38] = "260,60";
pos[39] = "265,60";
pos[40] = "270,60";
pos[41] = "275,60";
pos[42] = "280,60";
pos[43] = "285,60";
pos[44] = "290,60";
pos[45] = "295,60";
pos[46] = "300,60";
pos[47] = "305,60";

var step = 0;
var laststep = pos.length;

var timer;

function animate()
{
   step++;
   if(step == laststep) step = 0;
   
   var newpos = pos[step].split(",");
   rand = Math.floor(Math.random()*47+1) % 4;
   var newpos = pos[step + rand].split(",");   
   window.document.all.ball1.style.left = parseInt(newpos[0]);
   window.document.all.ball1.style.top = parseInt(newpos[1]);
   
   var thatpos = pos[step].split(",");
   rand = Math.floor(Math.random()*47+1) % 4;
   var thatpos = pos[step + rand].split(",");   
   window.document.all.ball2.style.left = parseInt(thatpos[0]);
   window.document.all.ball2.style.top = parseInt(105);
   
   timer = setTimeout("animate()",100);
   if(newpos[0] >= 301) window.location="won.php"; 
   if(newpos[0] >= 301) clearTimeout(timer);
   if(thatpos[0] >= 301) window.location="lost.php";
   if(thatpos[0] >= 301) clearTimeout(timer);

}

function stopAnimation()
{
   clearTimeout(timer);
}

</script>

</head>
<body onload='animate();' bgcolor="#333333">
<span id="he" style="position:absolute; visibility: visible; top:18; left:28; width:303; height:190; z-index:2"><img src='../My Pictures/bgg.bmp' width="344" height="142"></span><span id="ball1" style="position:absolute; visibility: visible; top:60; left:60; width:32; height:32; z-index:2">
<img border=0 width=32 height=15 src="../My%20Pictures/car.bmp"></span><span id="ball2" style="position:absolute; visibility: visible; top:90; left:60; width:32; height:32; z-index:2">
<img border=0 width=32 height=15 src="../My%20Pictures/car.bmp"></span>

Help plz

php_tom · September 27, 2007

Seems to work for me... I get two images 'racing' on the screen, when they reach the other side, it redirects to 'won.php'.

So I'm not sure what the problem you're having is. Maybe you need "var pos = new Array();" ?

mattal999 · September 27, 2007

try running it 5 times or more in frontpage or somthing that will show errors.

it doesnt do it all the time, just sometimes

emehrkay · September 27, 2007

the problem is that step is global and never reset. so after the first time it is run, it is still whatever it was the last time it was run.

and assign your arrays like this if your're not going to use all of the array features

var pos = [

'66,66',

'67,67' //and so on

];

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Error pos[...] Null or not an object. EEK!

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