decimal validation using javascript

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Hi,

my requirement is text box is there inside grid. For this textbox, i need validation like this-- before decimal user should able to enter 5 digit(should not allow to type more than 5) and after decimal 3 digit. How to do using javascript

C#

function IsDecimal(evt) {
            debugger;
            var charCode = (evt.which) ? evt.which : event.keyCode
            if (charCode > 31 && (charCode < 48 || charCode > 57) && charCode != 46)
                return false;
            else {
                var len = evt.value.length;
                var index = evt.value.indexOf('.');

                if (index > 0 && charCode == 46) {
                    return false;
                }

                if (index < 0) {
                    if (len > 5) {
                        return false;
                    }
                }


                    if (index > 0) {
                        var CharAfterdot = (len + 1) - index;
                        var CharBeforeDot = (len + 1) - CharAfterdot;
                        if (CharAfterdot > 4) {
                            return false;
                        }
                        if (CharBeforeDot > 5) {
                            return false;
                        }

                    }


            }
            return true;
        }

Here its allowing to user to enter till 5 digit before decimal.But problem is after that i m trying to put dot which is decimal.Its not allowing to enter to user into textbox

Posted 6-Jun-14 4:13am

kamalsekhar

Updated 6-Jun-14 4:15am

Nirav Prabtani

v2

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Peter Leow · Answer 1 · 2014-06-06T06:51:00

Try this:

XML

<!DOCTYPE html>
<html>
<body>
Textbox:
<input type="text" onkeyup="validate(this);" onkeydown="validate(this);">

<script>
function validate(e) {
   var isValidCharacter = true;
   e.value = e.value.trim();
   var inputValue = e.value;
   if(isNaN(inputValue)) {
      isValidCharacter = false;
   } else if (inputValue.length == 6 && inputValue.substr(inputValue.length - 1) != '.') {
      isValidCharacter = false;
   } else if (inputValue.length > 9) {
      isValidCharacter = false;
   }

   if(isValidCharacter == false) {
      e.value = inputValue.substring(0, inputValue.length - 1);
   }
}
</script>

</body>
</html>

DamithSL · Answer 2 · 2014-06-06T04:31:00

Solution 1

try with regex

JavaScript

var regex = /^[0-9]{0,5}(?:\.[0-9]{0,3})?$/;
return regex.test(evt.value);

Posted 6-Jun-14 4:31am

DamithSL

Comments

kamalsekhar 6-Jun-14 10:52am

Hi DamithSL,
Its not working. While typing its allowing user to enter more that 5 before decimal.

Balimusi · Answer 3 · 2014-06-06T07:01:00

Try this method below and call it from onkeypress event.

JavaScript

function isNumberAndDecimal(evt) {
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode != 45 && (charCode != 46 || $(this).val().indexOf('.') != -1) &&
            (charCode < 48 || charCode > 57))
        return false;

    return true;
}

XML

<asp:TextBox ID="txtQuantity" runat="server" MaxLength="10" Width="60px" onkeypress="return isNumberAndDecimal(event);"></asp:TextBox>

decimal validation using javascript

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