Membuat Kalkulator dengan Kode HTML

Reader, Ada yang tau bagaimana cara membuat kalkulator html dengan javascript ??. Buruan kemari sob, di kesempatan kali ini saya akan postng tutorialnya, cepat .. :) .. Langsung ke TKP saja sob.

1. Copy paste code dibawah ini ke notepad .

<form name="Keypad" action>
<table border="1" bgcolor="#838383">
<tr>
<td colspan="5" bgcolor="#DFDFDF">
<input name="ReadOut" type="Text" size="30" value="0">
</td>
</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnSeven" type="Button" value=" 7 " onClick="NumPressed(7)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnEight" type="Button" value=" 8 " onClick="NumPressed(8)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnNine" type="Button" value=" 9 " onClick="NumPressed(9)">
</td>
<td bgcolor="#DFDFDF"><input name="btnNeg" type="Button" value=" +/- " onClick="Neg()"></td>
<td bgcolor="#DFDFDF"><input name="btnPercent" type="Button" value=" % " onClick="Percent()"></td>

</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnFour" type="Button" value=" 4 " onClick="NumPressed(4)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnFive" type="Button" value=" 5 " onClick="NumPressed(5)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnSix" type="Button" value=" 6 " onClick="NumPressed(6)">
</td>
<td bgcolor="#DFDFDF"><input name="btnPlus" type="Button" value=" + "
onClick="Operation('+')"></td>
<td bgcolor="#DFDFDF"><input name="btnMultiply" type="Button" value=" * "
onClick="Operation('*')"></td>

</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnOne" type="Button" value=" 1 " onClick="NumPressed(1)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnTwo" type="Button" value=" 2 " onClick="NumPressed(2)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnThree" type="Button" value=" 3 " onClick="NumPressed(3)">
</td>
<td bgcolor="#DFDFDF"><input name="btnMinus" type="Button" value=" - "
onClick="Operation('-')"></td>
<td bgcolor="#DFDFDF"><input name="btnDivide" type="Button" value=" / "
onClick="Operation('/')"></td>

</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnZero" type="Button" value=" 0 " onClick="NumPressed(0)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnDecimal" type="Button" value=" . " onClick="Decimal()">
</td>
<td colspan="3" bgcolor="#797979">
<input name="btnClear" type="Button" value=" C " onClick="Clear()">
<input name="btnClearEntry" type="Button" value=" CE " onClick="ClearEntry()">
<input name="btnEquals" type="Button" value=" = " onClick="Operation('=')"></td>
</tr>
</table>
</form>
<script LANGUAGE="JavaScript">

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);
}
</script>

2. Kemudian simpan code tersebut dengan berekstansi ( .(titik)html ).
3. Kemudian jalankan dengan browser yang anda punya misalnya mozila firefox, google chrom, opera mini dll.

Cukup sekian tutorial diatas, saya ucapkan terima kasih yang telah membaca tutorial yang saya tulis. SALAM BLOGGER.

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