check pincode is number or not 

        
<!DOCTYPE html>
<html>
    <head>
        <title>check pincode is number or not</title>
    </head>
    <body>
    <h1>Check Pincode is number or not</h1>
    <form name="f1">
    Enter the Pincode:- <input type=text name="tpin" required><br>
    <input type="submit" value="check" onclick="check()">
    <input type="reset" value="Clear" alt="Clear the search form"><br>
   
    </form>
    <script type="text/javascript">
    function check()
        { 
            event.preventDefault();
            var p;
            p = f1.tpin.value;
            if(isNaN(p))
            {
                  alert("Entered Pincode is not a number");
            }
            else
            {
                  alert("Entered pincode is number");
            }
            
        }
    </script>
    </body>
</html>

Enter the Pincode:-


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