javascript - JQuery function to allow only alphabets in textbox not working -

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i use following jquery function restrict users writing numeric values in textbox. code works fine problem restrict users using other characters full stop(.), comma(,), $, @ , other signs..it not allow users use options of copy , past. want restrict users writing numeric values or numbers user should allowed use other characters.

$(function() {   $('.txtonly').keydown(function(e) {     if (e.shiftkey || e.ctrlkey || e.altkey) {       e.preventdefault();     } else {       var key = e.keycode;       if (!((key == 8) || (key == 32) || (key == 46) || (key >= 35 && key <= 40) || (key >= 65 && key <= 90))) {         e.preventdefault();       }     }   }); });

hope helps:

<!doctype html>  <html lang="en">     <head>         <script src="jquery-1.12.2.js"></script>     </head>     <body>         <input class="txtonly" id="txtonly" name="txtonly" type="text" />         <script>             $( document ).ready(function() {                 $( ".txtonly" ).keypress(function(e) {                     var key = e.keycode;                     if (key >= 48 && key <= 57) {                         e.preventdefault();                     }                 });             });         </script>     </body> </html>

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