javascript - Trying to enable a disabled button when a textfield is not empty -


so im trying enable button when 3 text fields not empty,and disable button again if become empty.right trying 1 field working first cant work , no idea why.would appreciate help

     <head>         <script type="text/javascript">         function checkenablesubmit() {            if ( completepurchaseform.address.value != "")            {document.getelementbyid("button").disabled = false;}       }        </script>             <form action="regservlet" name="completepurchaseform" method="post">             <table>                 <tr>                     <td> address  : </td><td> <input name="address" onkeyup="checkenablesubmit()" id="address" size=100 type="text" /> </td>                  </tr>                                     <tr>                     <td> card type  : </td><td> <input name="cardtype" id="cardtype" size=15 type="text" /> </td>                  </tr>                 <tr>                     <td> card number  : </td><td> <input name="cardnumber" id="cardnumber" size=15 type="text" /> </td>                  </tr>             </table>              <input type="hidden" name="action" value="completepurchase" />             <input type="button" disabled name="submit" value="complete purchase" />         </form>

add id button <input type="button" id="button1"> use document.getelementbyid("button1")


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