calculator using javascript(any one can help to get first value and second value without disappearing the 1st value when clicking the operators)

Question

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HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
table
{
	border-radius:15px;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Calculator</title>
<script type="text/javascript">
window.onload=function()
{
	document.calculator.result.focus();
}

var total;
var opr = 0;

function display(val)
{
	
	document.calculator.result.value+= val;
	
}

function txtclear()
{
	document.calculator.result.value='';
}

function operator(opval) 
{
opr = opval;
total = document.calculator.result.value;

}


function equals() 
{
CValue = eval(document.calculator.result.value)
PValue = eval(total)

if(opr =="+") 
{
answer = PValue + CValue;
}
else if(opr =="*") 
{
answer = PValue * CValue;
}
else if(opr =="-") 
{
answer = PValue - CValue;
}
else if(opr =="/") 
{
answer = PValue / CValue;
}
document.calculator.result.value = answer;
}
function box(e)
{
var unicode=e.charCode? e.charCode : e.keyCode
if (unicode!=8 && unicode!=9 && unicode!=13)
	{ 
	 if (unicode<42 || unicode>57) 
	 return false; 
    }
	if(unicode==13)
	{
	 equals();
	 return false;
	}
	if(unicode==43)
	{
		operator("+");
		return false;
	}
	if(unicode==45)
	{
		operator("-");
		return false;
	}
	if(unicode==42)
	{
		operator("*");
		return false;
	}
	if(unicode==47)
	{
		operator("/");
		return false;
	}document.calculator.result.value='';
}

</script>
</head>

<body  bgcolor="#3CACA9">
<form name="calculator">
<table width="248" height="309" border="3" bordercolor="#0099FF" align="center" style="margin-removed100px">
<tr> 
   <td height="29" colspan="5" style="background-color:#09C;">
     <div style="color:#C09; font-weight:bolder; font-size:15px; " align="left">Calculator
     </div>
   </td>
</tr>
<tr>
  <td height="56" colspan="5" style=" background-color:#09C;">
    
      <input type="text" name="result" style="height:100%; width:98.5%; text-align: right; font-family:Lucida Grande; font-size:45px;" onkeypress="return box(event)" />
    
  </td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button"  style="height:100%; width:100%; font-weight:bold" name="one" value="1"  onclick="display('1')" onmouseup="hello()" />
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="two" value="2" onclick="display('2')" onmouseup="hello()" />
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="three" value="3" onclick="display('3')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="add" value="+" onclick=operator("+") />
</td>
<td width="43" rowspan="4" align="center">
<input type="button"  style="height:225px; width:100%; font-weight:bold" name="evaluate" value="=" onclick=equals() />
</td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="four" value="4" onclick="display('4')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="five" value="5" onclick="display('5')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="six" value="6" onclick="display('6')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="subtract" value="-" onclick=operator("-") />
</td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="seven" value="7" onclick="display('7')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="eight" value="8" onclick="display('8')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="nine" value="9" onclick="display('9')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="multiply" value="*" onclick=operator("*") />
</td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="dot" value="." onclick="display('.')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="zero" value="0" onclick="display('0')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="clear" value="C" onclick="txtclear()"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="divide" value="/" onclick=operator("/") />
</td>
</tr>

</table>
</form>
</body>
</html>

Posted 30-Jan-12 23:44pm

vijaylotus123

Updated 30-Jan-12 23:55pm

LanFanNinja

v2

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CRDave1988 · Answer 1 · 2012-01-30T23:56:00

Solution 1

Check this out:
http://javascriptsource.com/math-related/advanced.html[^]

Posted 30-Jan-12 23:56pm

CRDave1988

Sergey Alexandrovich Kryukov · Answer 2 · 2012-01-31T15:53:00

Solution 2

Do you call it a calculator?

This is a calculator: http://sakryukov.org/freeware/calculator/[^].

—SA

Posted 31-Jan-12 15:53pm

Sergey Alexandrovich Kryukov