jQuery Validate：remote - 一切正常，但没有显示错误

I'm trying to implement email validation using the Bassistance jQuery plugin, with a check if the email adress exists.

The remote script returns correcctly true or false, however - no error message is shown. Other validation (required, email) works fine.

Any idea's what I'm missing here?

The jQuery code:

jQuery().ready(function() {
    jQuery("#post").validate({
        rules: {
            lid_email: {
                required: true,
                email: true,
                remote:  {
                    type: 'POST',
                    url:"email-check.php"
                }
            }
        },
        messages: {
            lid_email: {
                required: 'Gelieve een geldig e-mailadres in te vullen.<br>',
                email: 'Gelieve een geldig e-mailadres in te vullen.<br>',
                remote: 'Dit adres bestaat reeds. Gelieve een ander adres te kiezen.'
            }
        }
    })
    jQuery('#lid_email').blur(function() {
        jQuery("#post").validate().element( "#lid_email" );
    });
});

And the remote script:

<?php 
header('Content-type: application/json');
require('../../../wp-blog-header.php');

$request = trim(strtolower($_POST['lid_email']));

if ( email_exists($request) == TRUE ) {
    echo json_encode(FALSE);
} else {
    echo json_encode(TRUE);
}
?>

I found the solution:

• I'm using the script in a Wordpress site, and included wp-blog-header.php in order to have access to the Wordpress functions.

• Apparently the line require('../../../wp-blog-header.php breaks the json functionality

• If I remove this line, the booleans are sent correctly, and the error message shows up.

• All I have to do, is write my own user_exists-function, and then the problem should be solved.

Have you tried with:

echo (email_exists($request) === true )?'true':'false'

instead of:

if ( email_exists($request) == TRUE ) {
    echo json_encode(FALSE);
} else {
    echo json_encode(TRUE);
}

I have a similar problem and I resolved in this way. Additionally, I commented to you that in this way I didn't need put a json header.