"this[0] is undefined" message using jQuery validate plugin -


i've started use jquery validate plugin. having few issues display of error messages , wanted create test page experiment few things. despite same setup working me yesterday, i'm getting follwing message:

this[0] undefined

looking @ jquery code, fails in following section (specific line highlighted):

valid: function() {     if ( $(this[0]).is('form')) {         return this.validate().form();     } else {         var valid = true;         **var validator = $(this[0].form).validate();**         this.each(function() {             valid &= validator.element(this);         });         return valid;     } }

from looking @ it, must think validator isn't form, is. don't understand what's going on. code fails when try print out result of valid() method console. here's code far. grateful help.

<html xmlns="http://www.w3.org/1999/xhtml"> <head>     <style type="text/css">         th {             text-align: center;         }         .labelcol {             width: 60px;         }     </style>     <script type="text/javascript" src="jquery-1.6.1.full.js"></script>     <script type="text/javascript" src="jquery.validate.full.js"></script>     <script type="text/javascript">         $('#myform').validate({                         rules: {                             thisval: "required"                         }         });         console.info($('#myform').valid());     </script> </head>  <body>     <form id="myform" name="myform" action="" method="post">         <table>             <tr>                 <th colspan="2">header section</th>             </tr>             <tr>                 <td class="labelcol">this title</td>                 <td class="valuecol">                     <input type="text" name="thisval" id="thisval"                         maxlength="45" size="45" />                 </td>             </tr>             <tr>                 <td>                     <input type="submit" value="submit" />                 </td>             </tr>         </table>     </form> </body> </html>

your #myform form not loaded when script executed, $('#myform') doesn't match anything. wrap script in ready event handler.

<script type="text/javascript">    $(function() { // <-- add       $('#myform').validate({                     rules: {                         thisval: "required"                     }       });       console.info($('#myform').valid());    }); </script>

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