Only allow single dot in textbox

Question

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--I am using 
<pre lang="xml"><ajaxToolkit:FilteredTextBoxExtender ID="filtertext" runat="server"
       FilterType="Numbers, Custom" ValidChars="." TargetControlID="txtid">
   </ajaxToolkit:FilteredTextBoxExtender>

--But i want only single dot in the textbox. Currently user can enter multiple dot.

Like i want

23.45
.45

if entered

48. (then it should make it as 48.00)

Kindly help

Posted 10-Jan-14 0:19am

anurag19289

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6 solutions

Solution 3

try with the help of contains function. like that

C#

TextBox tt = new TextBox();
       if (tt.ToString().Contains('.'))
       {
           //code here
       }

i hope this is help full for you. for any query hit to reply.

Posted 10-Jan-14 0:30am

joginder-banger

Comments

TrushnaK 10-Jan-14 6:50am

he wants to allow at least single time.

Solution 1

You can try this regex.
^(?=\D*\d)\d*(\.\d+)?$
This may help.

Posted 10-Jan-14 0:28am

Gitanjali Singh

Comments

TrushnaK 10-Jan-14 6:52am

this regular expression can not add "." at single time.
he wants to add the "." at single time only.

But i want only single dot in the textbox. Currently user can enter multiple dot.

Solution 4

you can make use of below javascript.

JavaScript

function isNumberDecimalKey(evt, ctlName, decimalPlaces) {
           var key;

           var isShift;

           if (window.event) {

               key = window.event.keyCode;

               isShift = window.event.shiftKey ? true : false;

           } else {

               key = evt.which;

               isShift = evt.shiftKey ? true : false;

           }

           if (isShift) {

               switch (key) {

                   case 16:

                   case 37:

                       return false;

                       break;

                   default:

                       return false;

                       break;

               }

           }
           //debugger;
           var charCode = (evt.which) ? evt.which : event.keyCode;

           var txtValue = document.getElementById(ctlName.id).value

           //does not include current keypress
           if (charCode == 8 || charCode == 9 || charCode == 46 || charCode == 37 || charCode == 39)    // Backspace or tab or delete
               return true;


           if (charCode == 190 || charCode == 110) //decimal   Not allowing decimals
           {
               if (txtValue.indexOf(".") != -1)
                   return false;
               else
                   return true;
           }
           else if ((charCode > 57 || (charCode > 31 && charCode < 48)) && !(charCode >= 96 && charCode <= 105)) {     //48-0, 96-numpad 0 Omitting both 0(zeroes)
               return false;
           }
           else {
               if (decimalPlaces != null && txtValue.indexOf(".") != -1) {
                   var txtSplit = txtValue.split(".");
                   var caretPosition = doGetCaretPosition(ctlName);
                   if (txtSplit[1].length == decimalPlaces && caretPosition > txtSplit[0].length) {
                       // if input is over the max decimal place, detect whether current selection existing.
                       var selectionText = "";
                       if (window.getSelection) {
                           selectionText = window.getSelection();
                       }
                       else if (document.selection) {
                           selectionText = document.selection.createRange().text;
                       }
                       return selectionText.length != 0;
                   }
               }
               return true;
           }
       }

       function doGetCaretPosition(ctrl) {
           var CaretPos = 0;
           // IE Support
           if (document.selection) {
               ctrl.focus();
               var Sel = document.selection.createRange();
               Sel.moveStart('character', -ctrl.value.length);
               CaretPos = Sel.text.length;
           }
           // Firefox support
           else if (ctrl.selectionStart || ctrl.selectionStart == '0')
               CaretPos = ctrl.selectionStart;


           return (CaretPos);
       }

call it onkeydown event of textbox

return isNumberDecimalKey(event, this, 2);

where 2 is the number of decimal places allowed

Posted 10-Jan-14 0:34am

Prabhu S M

Updated 10-Jan-14 0:35am

v2

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Karthik_Mahalingam · Accepted Answer · 2014-01-10T00:30:00

Solution 2

Check this similar post, allow only one decimal point in a Text Box in Asp.Net. [^]

Posted 10-Jan-14 0:30am

Karthik_Mahalingam

Comments

anurag19289 11-Jan-14 4:04am

Thanks..this works

Karthik_Mahalingam 11-Jan-14 4:27am

welcome anurag :)

TrushnaK · Accepted Answer · 2014-01-10T00:35:00

Solution 5

try this:-

C#

document.getElementById('Textbox1').onkeypress = function (e) {
      if (e.keyCode === 46 && this.value.split('.').length === 2) {
        return false;
    }
}

try demo on:-http://jsfiddle.net/ygKHE/[^]

Posted 10-Jan-14 0:35am

TrushnaK

Comments

anurag19289 11-Jan-14 4:04am

Thanks thats a good idea to split and check.

anurag19289 · Accepted Answer · 2014-01-10T19:35:00

<pre lang="xml"><script type="text/javascript">
      function validate() {
          var num = document.getElementById("txtid").value;
          if (isNaN(num) == true) {

              alert("Please enter numeric value!");
              document.getElementById("txtid").value = "";

          }
      }
  </script>

<asp:textbox id="txtid" cssclass="textBox_for6tds" runat="server" onkeyup="javascript:validate();" xmlns:asp="#unknown">

--or it can be done in onblur()