Javascript Calculator - Buttons calculator keyboard support operations modulo
Javascript Calculator - Buttons calculator keyboard support operations modulo
The 09/08/2010 at 19:35:30
Rating: 4/5
Keywords: javascript calculator buttons calculator keyboard support mathematics operations modulo addition substraction multiplication division reset script function calculator html js
The 09/08/2010 at 19:35:30Rating: 4/5
Keywords: javascript calculator buttons calculator keyboard support mathematics operations modulo addition substraction multiplication division reset script function calculator html js
Hi,
This script is a Javascript Calculator valid (X)html strict 1.1 and CSS 2.1. This calculator has buttons and a zone to display the result, she offer various options.
This is a preview of the calculator:
She can do the following mathematic operations:
- Modulo(%)
- Additions(+)
- Substractions(-)
- Multiplications(x)
- Divisions(/)
- Conversion of a positif to a negatif number(also the inserse)
- Support point numbers
- Ability to reset (CE)
- This calculator support keyboard
This calculator is simple, she has a fonction that initialize the calculator when the page is loaded or when the user click on the CE button. She also have a function to add numbers when the user clicks on the buttons and an other to make the mathematic operations. Finaly, there is another function to detect keys when the user uses the keyboard.
This is the codes:
calculator.js
calc_array = new Array();
var calcul=0;
var pas_ch=0;
function $id(id)
{
return document.getElementById(id);
}
function f_calc(id,n)
{
if(n=='ce')
{
init_calc(id);
}
else if(n=='=')
{
if(calc_array[id][0]!='=' && calc_array[id][1]!=1)
{
eval('calcul='+calc_array[id][2]+calc_array[id][0]+calc_array[id][3]+';');
calc_array[id][0] = '=';
$id(id+'_result').value=calcul;
calc_array[id][2]=calcul;
calc_array[id][3]=0;
}
}
else if(n=='+-')
{
$id(id+'_result').value=$id(id+'_result').value*(-1);
if(calc_array[id][0]=='=')
{
calc_array[id][2] = $id(id+'_result').value;
calc_array[id][3] = 0;
}
else
{
calc_array[id][3] = $id(id+'_result').value;
}
pas_ch = 1;
}
else if(n=='nbs')
{
if($id(id+'_result').value<10 && $id(id+'_result').value>-10)
{
$id(id+'_result').value=0;
}
else
{
$id(id+'_result').value=$id(id+'_result').value.slice(0,$id(id+'_result').value.length-1);
}
if(calc_array[id][0]=='=')
{
calc_array[id][2] = $id(id+'_result').value;
calc_array[id][3] = 0;
}
else
{
calc_array[id][3] = $id(id+'_result').value;
}
}
else
{
if(calc_array[id][0]!='=' && calc_array[id][1]!=1)
{
eval('calcul='+calc_array[id][2]+calc_array[id][0]+calc_array[id][3]+';');
$id(id+'_result').value=calcul;
calc_array[id][2]=calcul;
calc_array[id][3]=0;
}
calc_array[id][0] = n;
}
if(pas_ch==0)
{
calc_array[id][1] = 1;
}
else
{
pas_ch=0;
}
document.getElementById(id+'_result').focus();
return true;
}
function add_calc(id,n)
{
if(calc_array[id][1]==1)
{
$id(id+'_result').value=n;
}
else
{
$id(id+'_result').value+=n;
}
if(calc_array[id][0]=='=')
{
calc_array[id][2] = $id(id+'_result').value;
calc_array[id][3] = 0;
}
else
{
calc_array[id][3] = $id(id+'_result').value;
}
calc_array[id][1] = 0;
document.getElementById(id+'_result').focus();
return true;
}
function init_calc(id)
{
$id(id+'_result').value=0;
calc_array[id] = new Array('=',1,'0','0',0);
document.getElementById(id+'_result').focus();
return true;
}
function key_detect_calc(id,evt)
{
if((evt.keyCode>95) && (evt.keyCode<106))
{
var nbr = evt.keyCode-96;
add_calc(id,nbr);
}
else if((evt.keyCode>47) && (evt.keyCode<58))
{
var nbr = evt.keyCode-48;
add_calc(id,nbr);
}
else if(evt.keyCode==107)
{
f_calc(id,'+');
}
else if(evt.keyCode==109)
{
f_calc(id,'-');
}
else if(evt.keyCode==106)
{
f_calc(id,'*');
}
else if(evt.keyCode==111)
{
f_calc(id,'');
}
else if(evt.keyCode==110)
{
add_calc(id,'.');
}
else if(evt.keyCode==190)
{
add_calc(id,'.');
}
else if(evt.keyCode==188)
{
add_calc(id,'.');
}
else if(evt.keyCode==13)
{
f_calc(id,'=');
}
else if(evt.keyCode==46)
{
f_calc(id,'ce');
}
else if(evt.keyCode==8)
{
f_calc(id,'nbs');
}
else if(evt.keyCode==27)
{
f_calc(id,'ce');
}
return true;
}
calculator.css.calculator
{
width:300px;
height:300px;
background-color:#eeeeee;
border:2px solid #CCCCCC;
margin:auto;
padding-left:5px;
padding-bottom:5px;
}
.calculator td
{
height:16.66%;
}
.calc_td_result
{
text-align:center;
}
.calc_result
{
width:90%;
text-align:right;
}
.calc_td_calculs
{
text-align:center;
}
.calc_calculs
{
width:90%;
text-align:left;
}
.calc_td_btn
{
width:25%;
height:100%;
}
.calc_btn
{
width:90%;
height:90%;
font-size:20px;
}
calculator.html<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Javascript Calculator</title>
<script type="text/javascript" src="calculator.js"></script>
<link rel="stylesheet" media="screen, print, handheld" type="text/css" href="calculator.css" />
</head>
<body>
<table class="calculator" id="calc">
<tr>
<td colspan="4" class="calc_td_result">
<input type="text" readonly="readonly" name="calc_result" id="calc_result" class="calc_result" onkeydown="javascript:key_detect_calc('calc',event);" />
</td>
</tr>
<tr>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="CE" onclick="javascript:f_calc('calc','ce');" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="←" onclick="javascript:f_calc('calc','nbs');" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="%" onclick="javascript:f_calc('calc','%');" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="+" onclick="javascript:f_calc('calc','+');" />
</td>
</tr>
<tr>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="7" onclick="javascript:add_calc('calc',7);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="8" onclick="javascript:add_calc('calc',8);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="9" onclick="javascript:add_calc('calc',9);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="-" onclick="javascript:f_calc('calc','-');" />
</td>
</tr>
<tr>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="4" onclick="javascript:add_calc('calc',4);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="5" onclick="javascript:add_calc('calc',5);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="6" onclick="javascript:add_calc('calc',6);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="x" onclick="javascript:f_calc('calc','*');" />
</td>
</tr>
<tr>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="1" onclick="javascript:add_calc('calc',1);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="2" onclick="javascript:add_calc('calc',2);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="3" onclick="javascript:add_calc('calc',3);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="÷" onclick="javascript:f_calc('calc','');" />
</td>
</tr>
<tr>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="0" onclick="javascript:add_calc('calc',0);" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="±" onclick="javascript:f_calc('calc','+-');" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="," onclick="javascript:add_calc('calc','.');" />
</td>
<td class="calc_td_btn">
<input type="button" class="calc_btn" value="=" onclick="javascript:f_calc('calc','=');" />
</td>
</tr>
</table>
<script type="text/javascript">
document.getElementById('calc').onload=init_calc('calc');
</script>
</body>
</html>TestI hope this script will be useful.
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