Tuesday, May 30, 2017

Javascript: How to develop a simple Calculator using Javascript?

Source Code

<!-- this script got from www.javascriptfreecode.com-Coded by: Krishna Eydat -->
<CENTER>

Download complete source code here

<FORM name="Keypad" action="">
<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 Accumulate = 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 )
Accumulate += parseFloat(Readout);
else if ( '-' == PendingOp )
Accumulate -= parseFloat(Readout);
else if ( '/' == PendingOp )
Accumulate /= parseFloat(Readout);
else if ( '*' == PendingOp )
Accumulate *= parseFloat(Readout);
else
Accumulate = parseFloat(Readout);
FKeyPad.ReadOut.value = Accumulate;
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 () {
Accumulate = 0;
PendingOp = "";
ClearEntry();
}
function Neg () {
FKeyPad.ReadOut.value = parseFloat(FKeyPad.ReadOut.value) * -1;
}
function Percent () {
FKeyPad.ReadOut.value = (parseFloat(FKeyPad.ReadOut.value) / 100) * parseFloat(Accumulate);
}
// End -->
</SCRIPT>

Output


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HTML: How to develop a simple Calculator just using HTML?

Source Code:

<html>
<body>
<form name="myform">
    <table width="210" border="1" cellspacing="1" cellpadding="1" bgcolor="#003366">
      <tr>
        <td align="center">
          <table width="173" border="0" cellspacing="0" cellpadding="0" height="130">
            <tr>
Download Source Code here

           
            </tr>
            <tr>
              <td colspan="3">
                <input type="text" name="display" size="20">
              </td>
              <td width="53" height="0"> <font color="#FFFFFF">
                <input type="button" name="clear" value="   c   "
            onClick="myform.display.value=''" onMouseover="window.status='Clear numbers'" onMouseout="window.status=''">
                </font></td>
            </tr>
            <tr>
              <td width="53" height="0">
                <input type="button" name="seven" value="   7   "
            onClick="myform.display.value+='7'">
              </td>
              <td width="53" height="0">
                <input type="button" name="eight" value="   8   "
            onClick="myform.display.value+='8'">
              </td>
              <td width="53" height="0">
                <input type="button" name="nine" value="   9   "
            onClick="myform.display.value+='9'">
              </td>
              <td width="53" height="0"> <font color="#FFFFFF">
                <input type="button" name="divide" value="   /    "
            onClick="myform.display.value+='/'">
                </font></td>
            </tr>
            <tr>
              <td width="53" height="0">
                <input type="button" name="four" value="   4   "
            onClick="myform.display.value+='4'">
              </td>
              <td width="53" height="0">
                <input type="button" name="five" value="   5   "
            onClick="myform.display.value+='5'">
              </td>
              <td width="53" height="0">
                <input type="button" name="six" value="   6   "
            onClick="myform.display.value+='6'">
              </td>
              <td width="53" height="0"> <font color="#FFFFFF">
                <input type="button" name="times" value="   x   "
            onClick="myform.display.value+='*'">
                </font></td>
            </tr>
            <tr>
              <td width="53" height="0">
                <input type="button" name="one" value="   1   "
            onClick="myform.display.value +='1'">
              </td>
              <td width="53" height="0">
                <input type="button" name="two" value="   2   "
            onClick="myform.display.value +='2'">
              </td>
              <td width="54" height="0">
                <input type="button" name="three" value="   3   "
            onClick="myform.display.value +='3'">
              </td>
              <td width="72" height="0"> <font color="#FFFFFF">
                <input type="button" name="minus" value="    -   "
            onClick="myform.display.value+='-'">
                </font></td>
            </tr>
            <tr>
              <td width="53" height="0">
                <input type="button" name="zero" value="   0   "
            onClick="myform.display.value+='0'">
              </td>
              <td width="53" height="0"> </td>
              <td width="54" height="0">
                <input type="button" name="plus" value="   +   "
            onClick="myform.display.value +='+'">
              </td>
              <td width="72" height="0"> <font color="#FFFFFF">
                <input type="button" name="calculate" value="   =   "
            onClick="myform.display.value=eval(myform.display.value)">
                </font></td>
            </tr>
          </table>
        </td>
      </tr>
    </table>
  </form>
</body>
</html>

Output:


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JavaScript: Change Font color and Background color randomly.

Source Code

<!-- TWO STEPS TO INSTALL COLORASSIST:

  1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  -->

<!-- STEP ONE: Paste this code into the HEAD of your HTML document  -->

Download Source Codes here


<HEAD>

<SCRIPT LANGUAGE="JavaScript">


<!-- Begin
function showBGColor()
{
  if(document.clrForm.bgRandom.checked == true)
    document.bgColor = document.clrForm.bgColor.value = getRandom();
  else
  {
    if(document.clrForm.bgColor.value.search(/^#[a-f0-9]{6}$/ig) == -1)
      alert('Invalid background color');
    else
      document.bgColor = document.clrForm.bgColor.value;
  }
}
function showTXTColor()
{
  if(document.clrForm.txtRandom.checked == true)
    txtChg.style.color = document.clrForm.txtColor.value = getRandom();
  else
  {
    if(document.clrForm.txtColor.value.search(/^#[a-f0-9]{6}$/ig) == -1)
      alert('Invalid font color');
    else
      txtChg.style.color = document.clrForm.txtColor.value;
  }
}
var pool = new Array("0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F");
function getRandom()
{
  var clr = '';
  for(i=0; i<6; i++)
  {
    num = Math.round(Math.random() * (pool.length-1));
    clr += pool[num];
  }
  return '#'+ clr;
}
function saveColor(field)
{
  if(field == "bgColor")  // bgColor field
    opt = document.clrForm.bgColor.value.toUpperCase();
  else // txtColor field
    opt = document.clrForm.txtColor.value.toUpperCase();
  if(opt != '')
  {
    i = document.clrForm.saveList.options.length;
    for(j=0; j < i; j++)
    {
      if(document.clrForm.saveList.options[j].value == opt)
        return;
    }
    document.clrForm.saveList.options[i] = new Option(opt, opt);
    document.clrForm.saveList.selectedIndex = i;
  }
}
function putColor(field)
{
  if(field == "bgColor")  // bgColor field
  {
    if(document.clrForm.saveList.selectedIndex >= 0)
    {
      document.clrForm.bgRandom.checked = false;
      document.clrForm.bgColor.value = document.clrForm.saveList.options[document.clrForm.saveList.selectedIndex].value;
      showBGColor();
    }
  }
  else // txtColor field
  {
    if(document.clrForm.saveList.selectedIndex >= 0)
    {
      document.clrForm.txtRandom.checked = false;
      document.clrForm.txtColor.value = document.clrForm.saveList.options[document.clrForm.saveList.selectedIndex].value;
      showTXTColor();
    }
  }
}
//  End -->
</script>

</HEAD>

<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

<BODY>

<div align="center">
<form name="clrForm">
<table bgcolor="white" border="1">
<tr>
  <td align="left" valign="top"><font face="verdana" size="-1">
    <b>Background Color:</b><br>
    <input type="text" name="bgColor" value="#FFFFFF" size="8" maxlength="7" onKeyUp="document.clrForm.bgRandom.checked=false;">
    <input type="button" name="addBG" value="save ->" onClick="saveColor('bgColor');"><br>
    <input type="checkbox" name="bgRandom"> random<br>
    <input type="button" value="Display" onClick="showBGColor()">
    </font>
  </td>
  <td align="center" valign="top"><font face="verdana" size="-1">
    <b>Saved List:</b><br>
    <select name="saveList" size="2">
    </select><br>
    <input type="button" name="fillBG" value="<- put" onClick="putColor('bgColor');">
    <input type="button" name="fillTXT" value="put ->" onClick="putColor('txtColor');">
    </font>
  </td>
  <td align="right" valign="top"><font face="verdana" size="-1">
    <b>Font Color:</b><br>
    <input type="button" name="addTXT" value="<- save" onClick="saveColor('txtColor');">
    <input type="text" name="txtColor" value="#000000" size="8" maxlength="7" onKeyUp="document.clrForm.txtRandom.checked=false;"><br>
    <input type="checkbox" name="txtRandom"> random<br>
    <input type="button" value="Display" onClick="showTXTColor()">
    </font>
  </td>
</tr>
</table>
<h2 id=txtChg align=center>Make your choices above</h2>
</form>
</div>

Sample Output


Output in Video

Download Source File



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