Finally, here is the revised version... im open to suggestions and commens.
<html>
<head>
<title>All about HEX - by Kumashgore</title>
</head>
<script language="JavaScript">
<!--
var hexstr = '0123456789ABCDEF';
function compare(text1,text2)
{
len = 0; ctr = 0; str = ''; error = 0;
text1val = '<font size="2" face="courier new">'; text2val = '<font size="2" face="courier new">';
if (text1.length >= text2.length) len=text1.length;
else len=text2.length;
for (x=0; x<len; x++)
{
if(text1.charAt(x) == text2.charAt(x))
{
if (text1.charAt(x) < ' ')
if(ctr == 1)
{
text1val += '<br>';
text2val += '<br>';
ctr = 0;
}
else
ctr++;
else
text1val += text1.charAt(x);
text2val += text2.charAt(x);
}
else
{
text1val += '<font style="color:black; background: yellow;"><b>' + text1.charAt(x) + "</b></font>";
text2val += '<font style="color:red; background: yellow;"><b>' + text2.charAt(x) + "</b></font>";
error = 1;
}
}
if(error == 0) alert('Done without errors!');
else
document.write('<table width="100%" border=1><tr><td width="50%" valign="top">' + text1val + '</td><td width="50%" valign="top">' + text2val + '</td></tr></table>');
}
function validatehex(hexval)
{
if (hexstr.indexOf(hexval.charAt(0)) >= 0)
if (hexstr.indexOf(hexval.charAt(1)) >= 0)
if (hexval.length == 2)
return 1;
}
function h2dconvert(hexval)
{
var hexvalue = 0;
if (hexstr.indexOf(hexval.charAt(0)) >= 0)
hexvalue += hexstr.indexOf(hexval.charAt(0)) * 16;
if (hexstr.indexOf(hexval.charAt(1)) >= 0)
hexvalue += hexstr.indexOf(hexval.charAt(1));
return hexvalue;
}
function hextodec(hexval)
{
if (validatehex(hexval) == 1)
alert(hexval + ' = ' + h2dconvert(hexval));
else
alert('Please input correct Hex value (ex. 0E)');
}
function subhex(hex1, hex2)
{
if (validatehex(hex1) + validatehex(hex2) == 2)
alert(hex1 + '[' + h2dconvert(hex1) + ']' + ' - ' + hex2 + '[' + h2dconvert(hex2) + ']' + ' = ' + (h2dconvert(hex1) - h2dconvert(hex2)));
else
alert('Please input correct Hex value (ex. 0E)');
}
function d2hconvert(hexval)
{
decvalue = hexstr.charAt(Math.floor(eval(hexval) / 16)) + hexstr.charAt(eval(hexval) % 16);
return decvalue;
}
function dectohex(hexval)
{
if ((hexval<=255) && (hexval != ' '))
alert(hexval + ' = ' + d2hconvert(hexval));
else
alert('Please input number from 0-255.');
}
function addhex(hex1, hex2)
{
if (validatehex(hex1) + validatehex(hex2) == 2)
alert(hex1 + '[' + h2dconvert(hex1) + ']' + ' - ' + hex2 + '[' + h2dconvert(hex2) + ']' + ' = ' + (h2dconvert(hex1) + h2dconvert(hex2)));
else
alert('Please input correct Hex value (ex. 0E)');
}
-->
</script>
<body>
<form>
<center>
<font size="-1">All about HEX - by Kumashgore</font><br><br>
<table border="0" width="50%">
<tr><td align="center">
<textarea name="text1" cols="40" rows="4"></textarea><br><textarea name="text2" cols="40" rows="4"></textarea><br>
<input type="button" onclick="compare(text1.value,text2.value);" value="Compare Hex">
<br><br><hr>
<table border="0" width="100%">
<tr>
<td><input type="text" name="hextodecval" size="2"> <input type="button" onclick="hextodec(hextodecval.value.toUpperCase());" value="Hex to Dec"></td>
<td align="right"><input type="text" name="dectohexval" size="2"> <input type="button" onclick="dectohex(dectohexval.value);" value="Dec to Hex"></td>
</tr><tr>
<td colspan="2"><hr></td>
</tr><tr>
<td><input type="text" name="subhex1" size="2"> <input type="text" name="subhex2" size="2"> <input type="button" onclick="subhex(subhex1.value.toUpperCase(), subhex2.value.toUpperCase());" value="Subtract Hex"></td>
<td align="right"><input type="text" name="addhex1" size="2"> <input type="text" name="addhex2" size="2"> <input type="button" onclick="addhex(addhex1.value.toUpperCase(), addhex2.value.toUpperCase());" value="Add Hex"></td>
</tr>
</table>
</td></tr>
</table>
</center>
</form>
</body>
</html>
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