Money Format : Validation « Form Control « JavaScript DHTML

Money Format


/*
JavaScript Unleashed, Third Edition
by Richard Wagner and R. Allen Wyke 

ISBN: 067231763X
Publisher Sams CopyRight 2000

*/
<html>
<head>
<title>Money Format</title>
<script language= "JavaScript">
<!--begin script
function moneyFormat(textObj) {
   var newValue = textObj.value;
   var decAmount = "";
   var dolAmount = "";
   var decFlag = false;
   var aChar = "";
   
   // ignore all but digits and decimal points.
   for(i=0; i < newValue.length; i++) {
      aChar = newValue.substring(i,i+1);
      if(aChar >= "0" && aChar <= "9") {
         if(decFlag) {
            decAmount = "" + decAmount + aChar;
         }
         else {
            dolAmount = "" + dolAmount + aChar;
         }
      }
      if(aChar == ".") {
         if(decFlag) {
            dolAmount = "";
            break;
         }
         decFlag=true;
      }
   }
   
   // Ensure that at least a zero appears for the dollar amount.

   if(dolAmount == "") {
      dolAmount = "0";
   }
   // Strip leading zeros.
   if(dolAmount.length > 1) {
      while(dolAmount.length > 1 && dolAmount.substring(0,1) == "0") {
         dolAmount = dolAmount.substring(1,dolAmount.length);
      }
   }
   
   // Round the decimal amount.
   if(decAmount.length > 2) {
      if(decAmount.substring(2,3) > "4") {
         decAmount = parseInt(decAmount.substring(0,2)) + 1;
         if(decAmount < 10) {
            decAmount = "0" + decAmount;
         }
         else {
            decAmount = "" + decAmount;
         }
      }
      else {
         decAmount = decAmount.substring(0,2);
      }
      if (decAmount == 100) {
         decAmount = "00";
         dolAmount = parseInt(dolAmount) + 1;
      }
   }
   
   // Pad right side of decAmount
   if(decAmount.length == 1) {
      decAmount = decAmount + "0";
   }
   if(decAmount.length == 0) {
      decAmount = decAmount + "00";
   }
   
   // Check for negative values and reset textObj
   if(newValue.substring(0,1) != '-' ||
         (dolAmount == "0" && decAmount == "00")) {
      textObj.value = dolAmount + "." + decAmount;

   }
   else{
      textObj.value = '-' + dolAmount + "." + decAmount;
   }
}
// end script-->
</script>
</head>
   
<body>
<h1>Money Format</h1>
<form name="form1">
<input type="text"
   size=16
   maxlength=16
   name="data">
<input type="button"
   name="CheckButton"
   value="Format"
   onClick="moneyFormat(document.form1.data)">
</form>
</body>
</html>

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