假设我有一个包含两个字段(电子邮件和库存号)的表单：

<form action="/something" method="post" id="demoForm">
     Inventory No: <input type="text" class="required" name="inventory_no" />
     Email: <input type="text" class="required" name="email" />
     <input type='submit' value='submit' />
</form>

绑定插件形成：

jQuery(function(){
    jQuery('#demoForm').validate();
});

//handle user submit

jQuery('#demoForm').bind('submit',function (e) {
    e.preventDefault();

    if (jQuery(e.target).valid()) {
        //form is valid submit request thru ajax

        jQuery.ajax({
            /*more options here*/

            success: function (data) {

                /*
                 Server process request and finds that,email is already in use
                 and inventory number is invalid
                 so it sends data in some format may pe JSon
                 with field names and message indicating errors
                 eg: Email:"Already in use"
                 InventoryNo: "Invalid Inventory No",Now can i invalidate these two fields on form mannualy
                 and display the message received from server for each field
                */
            }
        });
    }
});