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Allow only numberic key presses.

/ Published in: JavaScript
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The following code allows only numeric characters to be entered.

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Copy this code and paste it in your HTML 
  1. <html>
  2. <head>
  3. <script type="text/javascript">
  4.     function checkIt(evt) {
  5.         evt = (evt) ? evt : window.event
  6.         var charCode = (evt.which) ? evt.which : evt.keyCode
  7.         if (charCode > 31 && (charCode < 48 || charCode > 57)) {
  8.             document.getElementById("errorMessage").innerHTML = "This field accepts numbers only."
  9.             return false
  10.         }
  11.         document.getElementById("errorMessage").innerHTML = ""
  12.         return true
  13.     }
  14. </script>
  15. </head>
  16. <body>
  17.     <input id="numbersOnly" type="text" onKeyPress="return checkIt(event)" />
  18.     <span id="errorMessage"></span>
  19. </body>
  20. </html>

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