Regular expression to enforce 2 digits after decimal point

**ksmariraj** · 01-08-2013 07:38 AM

<html>
<script>
function doCheck(txtidval)
{
var i,exceptions=[8,46,37,39,13,9]; // backspace, delete, arrowleft & right, enter, tab
var isException=false;
var isDot=(190==event.keyCode); // dot
//Value which is typed
var k=String.fromCharCode(event.keyCode);

for (i=0;i<exceptions.length;i++)
{
if(exceptions[i]==event.keyCode)
isException=true;
}

if(isNaN(k) && (!isException) && (!isDot))
{
event.returnValue=false;
}
else
{
var p=new String(document.getElementById(txtidval).value+k).indexOf(".");

if((p<document.getElementById(txtidval).value.length-2 || isDot) && p>-1 && (!isException))
{
event.returnValue=false;
}
else if(document.getElementById(txtidval).value.length>=3 && (!isException) && p==-1)
{
//dot checking
if(event.keyCode != "190")
{
alert(document.getElementById(txtidval).value);
event.returnValue=false;
}
}
else if(document.getElementById(txtidval).value>=3)
{
alert(document.getElementById(txtidval).value);
}
}
}
</script>
<body>
<input type="textbox" id="txtid" onkeydown="doCheck('txtid')"/>
</body>
</html>

i dont need output like .21 and also after entering 575 when moving curson in front of 575 it allows dot(".") so please kindly correct it

**wbport** · 01-08-2013 02:54 PM

/(\d*\.\d\d)\D*/ Should do it. You can take result[1] to parseFloat to read it.

**ksmariraj** · 01-09-2013 12:54 AM

Hi Wbport Thanks for answering ..where we use that in my code ?

**wbport** · 01-09-2013 06:30 AM

Code:

result = valueFromATextArea.match(/(\d*\.\d\d)\D*)
if (result == null)
  alert("Insert appropriate squawk here");
else
  var theNumberIWantToLookAt = parseFloat(result[1]);

**ksmariraj** · 01-09-2013 09:30 AM

Thanks wbport

**JMRKER** · 01-09-2013 10:36 AM

An alternative solution...

Code:

<!DOCTYPE HTML>
<html>
<head>
<title> Untitled </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

</head>
<body>
<input type="text" onkeyup="return processNumber(this)" value="">
<script type="text/javascript">
function processNumber(info) {
  var v = info.value;
  var n = v.split('.');
  if (n[1] != undefined) { v = n[0]+'.'+n[1].substring(0,2); }
  info.value = v;
  return true;
}
</script>

</body>
</html>

**wbport** · 01-09-2013 12:11 PM

My first line should have read: result = valueFromATextArea.match(/(\d*\.\d\d)\D*/)

The last slash was needed to terminate the regular expression.

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