Javascript prevent special char

onkeypress

by Rich Costello

HTML

<form id="frm" runat="server">
      <input type="text" name="name"  onkeypress="return blockSpecialChar(event)"/></form>

JavaScript

function blockSpecialChar(e) {
            var k = e.keyCode;
            return ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8   || (k >= 48 && k <= 57));

        }