Textbox only for Numeric & decimal values

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Hi friends,
i have a Textbox like Add. Tax, in this textbox value can be like 12 or 12.5.
the textbox should contain such values not others any (special characters or alphabets).
how it can be achieve.

Regards,
aamir

Posted 21-Jul-12 1:32am

aamir07

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Sandeep Singh Shekhawat · Answer 1 · 2014-03-28T19:12:00

Following code accepts numbers and a decimal point.

C#

function isNumberKey(evt)
           {
               var charCode = (evt.which) ? evt.which : event.keyCode

               if (charCode == 46)
               {
                   var inputValue = $("#inputfield").val()
                   if (inputValue.indexOf('.') < 1)
                   {
                       return true;
                   }
                   return false;
               }
               if (charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57))
               {
                   return false;
               }
               return true;
           }

Siva Hyderabad · Answer 2 · 2014-03-28T19:21:00

C#

function validatenumerics(key) {
    //getting key code of pressed key
    var keycode = (key.which) ? key.which : key.keyCode;
    //comparing pressed keycodes

    if (keycode > 31 && (keycode < 48 || keycode > 57) && keycode != 46) {
        alert(" You can enter only characters 0 to 9 ");
        return false;
    }
    else return true;
}
function isNumberKey(key) {
    //getting key code of pressed key
    var keycode = (key.which) ? key.which : key.keyCode;
    //comparing pressed keycodes

    if (keycode > 31 && (keycode < 48 || keycode > 57) && keycode != 47) {
        alert(" You can enter only characters 0 to 9 ");
        return false;
    }
    else return true;
}

here first method for "Textbox" Accept only 0-9 numbers
second method for "textbox accept 0-9 and one decimal point"

You can place the code between Script tag..

call like this in text box tag..
onkeypress="return isNumberKey(event)"

Ganesh Kumar Kaki · Answer 3 · 2012-07-21T01:42:00

Go for the javascript coding
Its better and light weight
check the below code

HTML

<html>
  <head>
    <script language="Javascript">
       <!--
       function isNumberKey(evt)
       {
          var charCode = (evt.which) ? evt.which : event.keyCode
          if (charCode != 46 && charCode > 31 
            && (charCode < 48 || charCode > 57))
             return false;

          return true;
       }
       //-->
    </script>
  </head>
  <body>
    <input id="txtChar" onkeypress="return isNumberKey(event)">
           type="text" name="txtChar"&gt;
  </input></body>
</html>

OriginalGriff · Answer 4 · 2012-07-21T01:46:00

How you do it depends on what you are producing: For web applications you could use a validator:

XML

<asp:TextBox ID="NumericTextBox" runat="server"></asp:TextBox>
    <asp:RegularExpressionValidator ID="NumericOnlyValidator" runat="server" ControlToValidate="TextBox1" ErrorMessage="Enter a valid number" ValidationExpression="^\d$"></asp:RegularExpressionValidator>

Or, you could do it with Javascript, and prevent entry of non-numerics:

function isNumeric(evt)
{
 var c = (evt.which) ? evt.which : event.keyCode
 if ((c >= '0'  && c <= '9') || c == '.' )
    return true;
 return false;
}

MyTextBox.Attributes.Add("onkeypress","return isNumeric(event)");

For a Winforms, I would use a NumericUpDown.

UTHIRASAMY · Answer 5 · 2013-04-26T06:10:00

This is Working greate ...........

event : onfocusout="fnAdddecimal('txtDTI');"

function fnAdddecimal(obj) {

txt = document.getElementById(obj);
var val = jsTrimValues(txt.value);
if (val != '') {
val = val.split('.00');
if (val.length > 1) {

}
else {
txt.value = txt.value + '.00';
}
}
}

King Fisher · Answer 6 · 2014-03-28T20:41:00

simply you can use ajax tools

C#

<asp:textbox id="txtbox" runat="server" xmlns:asp="#unknown"></asp:textbox><asp:filteredtextboxextender targetcontrolid="txtbox" xmlns:asp="#unknown">
                     FilterType="Custom, Numbers" ValidChars="."  ID="FilteredTextBoxExtender1" runat="server">
                   </asp:filteredtextboxextender>

Filtered Texbox

Textbox only for Numeric & decimal values

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