Számológép haladóknak.

<div align=center>
<FORM name="Keypad" action="">
<table>
<strong>
<table border=2 width=50 height=60 cellpadding=1 cellspacing=5>
<tr>
<td colspan=3 align=middle>
<input name="ReadOut" type="Text" size=24 value="0" width=100%> </td>
<td> </td>
<td><input name="btnClear" type="Button" value=" C " onclick="Clear()"> </td>
<td><input name="btnClearEntry" type="Button" value=" CE " onclick="ClearEntry()"> </td>
</tr>
<tr>
<td><input name="btnSeven" type="Button" value=" 7 " onclick="NumPressed(7)"></td>
<td><input name="btnEight" type="Button" value=" 8 " onclick="NumPressed(8)"></td>
<td><input name="btnNine" type="Button" value=" 9 " onclick="NumPressed(9)"></td>
<td> </td>
<td><input name="btnNeg" type="Button" value=" +/- " onclick="Neg()"></td>
<td><input name="btnPercent" type="Button" value=" % " onclick="Percent()"></td>
</tr>
<tr>
<td><input name="btnFour" type="Button" value=" 4 " onclick="NumPressed(4)"></td>
<td><input name="btnFive" type="Button" value=" 5 " onclick="NumPressed(5)"></td>
<td><input name="btnSix" type="Button" value=" 6 " onclick="NumPressed(6)"></td>
<td> </td>
<td align=middle><input name="btnPlus" type="Button" value=" + " onclick="Operation('+')"></td>
<td align=middle><input name="btnMinus" type="Button" value=" - " onclick="Operation('-')"></td>
</tr>
<tr>
<td><input name="btnOne" type="Button" value=" 1 " onclick="NumPressed(1)"></td>
<td><input name="btnTwo" type="Button" value=" 2 " onclick="NumPressed(2)"></td>
<td><input name="btnThree" type="Button" value=" 3 " onclick="NumPressed(3)"></td>
<td> </td>
<td align=middle><input name="btnMultiply" type="Button" value=" * " onclick="Operation('*')"></td>
<td align=middle><input name="btnDivide" type="Button" value=" / " onclick="Operation('/')"></td>
</tr>
<tr>
<td><input name="btnZero" type="Button" value=" 0 " onclick="NumPressed(0)"></td>
<td><input name="btnDecimal" type="Button" value=" . " onclick="Decimal()"></td>
<td colspan=3> </td>
<td><input name="btnEquals" type="Button" value=" = " onclick="Operation('=')"></td>
</tr>
</table>
</strong>
</FORM>
<font face="Verdana, Arial, Helvetica" size=2>
<script language="JavaScript" type="text/javascript" src="haladocalculator_java.js"> </script>
</div>

CSS - fájl, azaz stílusmeghatározás, a számológéphez nem készül.
Ha, akarunk készíteni, akkor megtehetjük. A table, és td cellákat el kell látni, egyedi azonosítókkal, melyekhez egyedi stílust írhatunk.

var FKeyPad = document.Keypad;
var Accum = 0;
var FlagNewNum = false;
var PendingOp = "";
function NumPressed (Num)
{
if (FlagNewNum)
{
FKeyPad.ReadOut.value = Num;
FlagNewNum = false;
}
else
{
if (FKeyPad.ReadOut.value == "0")
FKeyPad.ReadOut.value = Num;
else
FKeyPad.ReadOut.value += Num;
}
}
function Operation (Op)
{
var Readout = FKeyPad.ReadOut.value;
if (FlagNewNum && PendingOp != "=");
else
{
FlagNewNum = true;
if ( '+' == PendingOp )
Accum += parseFloat(Readout);
else if ( '-' == PendingOp )
Accum -= parseFloat(Readout);
else if ( '/' == PendingOp )
Accum /= parseFloat(Readout);
else if ( '*' == PendingOp )
Accum *= parseFloat(Readout);
else
Accum = parseFloat(Readout);
FKeyPad.ReadOut.value = Accum;
PendingOp = Op;
}
}
function Decimal ()
{
var curReadOut = FKeyPad.ReadOut.value;
if (FlagNewNum)
{
curReadOut = "0.";
FlagNewNum = false;
}
else
{
if (curReadOut.indexOf(".") == -1)
curReadOut += ".";
}
FKeyPad.ReadOut.value = curReadOut;
}
function ClearEntry ()
{
FKeyPad.ReadOut.value = "0";
FlagNewNum = true;
}
function Clear ()
{
Accum = 0;
PendingOp = "";
ClearEntry();
}
function Neg ()
{
FKeyPad.ReadOut.value = parseFloat (FKeyPad. ReadOut. value) * -1;
}
function Percent ()
{
FKeyPad.ReadOut.value = (parseFloat (FKeyPad. ReadOut. value) / 100) * parseFloat (Accum);
}