JavaScript Made Easy: Free JavaScripts Tutorials Example Code

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JavaScript Basics

Inserting Javascript

Complete Tutorial

Advance DHTML Tutorial


Advanced Calculator		[View Sample]

This is a very comprehensive JavaScript calculator. Although the source code can get quite confusing, it works.


Insert into <HEAD>


Insert into <BODY>
<CENTER> <FORM name="Keypad" action=""> <!-- Original: http://www.dummyproof.com/javascripts --> <TABLE> <B> <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> </TABLE> </B> </FORM> </CENTER> <font face="Verdana, Arial, Helvetica" size=2> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin 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); } // End --> </SCRIPT>

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