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

I've started to use the jQuery validate plugin. I was having a few issues with the display of the error messages and wanted to create a test page where I could experiment with a few things. Despite the same setup working for me yesterday, I'm now getting the follwing message:

this[0] is undefined

looking at the jQuery code, it fails in the 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 at it, it must think that my validator isn't a form, but it is. Don't really understand what's going on. The code only fails when try to print out the result of the valid() method to the console. Here's my code so far. Grateful for any 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>
like image 230
Joe Avatar asked Jul 01 '11 10:07

Joe


3 Answers

Your #myform form is not loaded when the script is executed, so $('#myform') doesn't match anything. Wrap your script in a ready event handler.

<script type="text/javascript">
   $(function() { // <-- add this
      $('#myform').validate({
                    rules: {
                        thisval: "required"
                    }
      });
      console.info($('#myform').valid());
   });
</script>
like image 74
Bertrand Marron Avatar answered Oct 31 '22 10:10

Bertrand Marron


Wrap your code in a document ready function such as:

$(function()
{

    $('#myform').validate({
                    rules: {
                        thisval: "required"
                    }
    });
    console.info($('#myform').valid());

});
like image 2
Alex Avatar answered Oct 31 '22 12:10

Alex


Same happened here. For me it was a typo in my code:

$(document).ready(function(){
    //START of validate
$('#reply').validate({
    rules:{
        message:{
            required: true,
            },  
        },
    submitHandler: function(form) {
        var data = $("#reply").serialize();
        $.ajax({
            type:"POST",
            url:"ajax/scripts/msg_crt.php",
            data:data,
            success:function(data){
                alert("Loaded");
                }
            });
        }
    });
    //END of validate
  });

$(document).on('click','#send', function(){
    if($('#replay').valid()){// <--- Here is my selector typo
        $("#replay").submit(); // <--- Here is my selector typo
        }
        return false;
    });
like image 1
Rusty Avatar answered Oct 31 '22 12:10

Rusty