Allow only Numeric Value in TextBox

by Ravi Tuvar 4:06 AM 0 comments

In this post i have tried to explain how to disallow all other characters then numeric values using javascript .

Using JavaScript

1st Way

Step 1 -

Write the Following JavaScript Code in Scripting area.

function isNumberKey(evt)
{
 var charCode = (evt.which) ? evt.which : event.keyCode
 if (charCode > 31 && (charCode < 48 || charCode > 57) )
    return false;

 return true;
}

Step 2-

Now add following textbox code in code-behind on page Load event

TetxBox1.Attributes.Add("onkeypress","return isNumberKey(event)");

2nd Way

 <script type="text/javascript">
        function IsDecimal(e)
        {
          var chrCode = (e.which) ? e.which : event.keyCode
          return (chrCode > 47 && chrCode < 58) || 
          chrCode == 8  ||
          chrCode == 45 ||
          chrCode == 46 ? true: false;
        }
      </script>

<input type="text" id="txtDecimal"  önkeypress="return IsDecimal(event);" />