Learning jQuery

Below jQuery code snippets will allow only numbers in the textbox. However backspace and delete keys are also allowed.

$(document).ready(function(){ 
   $("#<%= txtNumbers.ClientID%>").keydown(function(e) 
   {
       if (e.shiftKey) 
           e.preventDefault();
       else 
       {
           var nKeyCode = e.keyCode;
           //Ignore Backspace and Tab keys
           if (nKeyCode == 8 || nKeyCode == 9)
               return;
           if (nKeyCode < 95) 
           {
               if (nKeyCode < 48 || nKeyCode > 57)
                   e.preventDefault();
           }
           else 
           {
               if (nKeyCode < 96 || nKeyCode > 105) 
               e.preventDefault();
           }
       }
   });
});

Also read my related posts, which describe how to allow arrow keys with number, alphabets and specific characters.

Feel free to contact me for any help related to jQuery. I will gladly help you.