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JavaScript - Allow only numbers in TextBox (Restrict Alphabets and Special Characters)

This JavaScript function will be used to restrict alphabets and special characters in Textbox , only numbers, delete, arrow keys and backspace will be allowed.

Allow Numbers in TextBox, Restrict Alphabets and Special Characters Using JavaScript

JavaScript function

<script type="text/javascript">
   /*code: 48-57 Numbers*/
   function restrictAlphabets(e){
       var x = e.which || e.keycode;
   	if((x>=48 && x<=57))
   		return true;
   	else
   		return false;
   }
</script>

HTML Source Code with JavaScript

<!--
   JavaScript - Allow only numbers in TextBox 
   (Restrict Alphabets and Special Characters).
   -->
<html>
   <head>
      <title>JavaScript - Allow only numbers in TextBox (Restrict Alphabets and Special Characters).</title>
      <script type="text/javascript">
         /*code: 48-57 Numbers*/
         function restrictAlphabets(e) {
             var x = e.which || e.keycode;
             if ((x >= 48 && x <= 57))
                 return true;
             else
                 return false;
         }
      </script>
   </head>
   <body style="text-align: center;">
      <h1>JavaScript - Allow only numbers in TextBox (Restrict Alphabets and Special Characters).</h1>
      <big>Enter numbers only: </big>
      <input type="text" onkeypress='return restrictAlphabets(event)'/>
   </body>
</html>