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Accept only numbers in an textbox.

This javascript function is used to make an text-box to accept number alone.

JavaScript:

function isNumberKey(evt)                                   
      {                                   
         var charCode = (evt.which) ? evt.which : event.keyCode                                   
         if (charCode > 31 && (charCode < 48 || charCode > 57))                                   
            return false;                                   
                                   
         return true;                                   
      }                                   

<input type="text"  Onkeypress="return isNumberKey(event)"/>                                   
   

Demo:
                            
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