Unable to send ajaxSubmit request

[noblehabib256]

i have created form via jquery after dom us loaded when ever i use ajaxSubmit it do nothing i am sending you sample code

function createForm(url,method,fields){
     var newForm = $('<form>', {
        'action': url,
        'method': method,

    }).append(jQuery('<input>', {
        'name': 'q',
        'value': 'stack overflow',
        'type': 'hidden'
    }));

    for (var key in fields) {
    var value = fields[key];
   $(newForm).append($('<input>', {
        'name': key,
        'value': value,
        'type': 'hidden'
    }));
}
return newForm;
}

 var cart_id=$(this).closest('tr').attr('id'); 
             var field= $(this).attr('name');
             var fieldVal=$(this).val();
             var fields= {id:cart_id,field:fieldVal};
             var url="<?php echo $this->ServerUrl;?>/mainadmin/ajax/Sales/edit-item.php";
             var method='post'

             var myForm=createForm(url,method,fields);
            $(myForm).ajaxSubmit({dataType:  'json', beforeSubmit: salesBeforeSubmit, success: processAddData});