Jquery.parent在DOM上面写得太多了

我正在尝试创建一个动态联系人表单错误检查脚本…这一切都很好，除了当我试图改变直接在输入字段上面的HTML元素的类。下面是我的代码:

<div class="container">
                <div class="row">
                    <div class="col-sm-4">
                        <h4>Address:</h4>
                        <address>
                            <p>
                                Plot 12<br>
                                Ogudu Phase 2 <br>
                                Ogudu Lagos <br>
                                <a href="mailto:marketing@businessplusng.com">marketing@businessplusng.com</a>
                            </p>
                        </address>
                    </div>
                    <form method="post" id="contactform" class="form-minimal">
                        <div class="col-sm-4"> 
                            <div class="form-group">
                                <label for="name">Name</label>
                                <input type="text" class="form-control" name="name" id="name" placeholder="Enter name"  title="Please enter your name (at least 2 characters)"/>
                                <div class="form-line"></div>
                            </div>
                            <div class="form-group">
                                <label for="email">Email</label>
                                <input type="email" class="form-control" name="email" id="email" placeholder="Enter email" title="Please enter a valid email address"/>
                                <div class="form-line"></div>
                            </div>
                            <div class="form-group">
                                <label for="phone">Phone</label>
                                <input name="phone" class="form-control required digits" type="tel" id="phone" size="30" value="" placeholder="Enter email phone" title="Please enter a valid phone number (at least 10 characters)">
                                <div class="form-line"></div>
                            </div>
                        </div>
                        <div class="col-sm-4">
                            <div class="form-group">
                                <label for="comments">Your Brief</label>
                                <textarea name="comment" class="form-control" id="comments" cols="3" rows="5" placeholder="Enter your message…" title="Please enter your message (at least 10 characters)"></textarea>
                                <div class="form-line"></div>
                            </div>

                        </div>                        
                        <div class="col-md-8 col-md-offset-4">
                            <button name="submit" type="submit" class="btn large primary" id="submit"> Submit</button>
                            <div class="result"></div>
                        </div>
                    </form>

这是我的javascript代码

var form = $("#contactform");
var submit= $("#submit");
var name =$("#name");
var email =$("#email");
var comments =$("#comments");
form.submit(function(e) {
    e.preventDefault();
if($("input#name").val().length < 10)
    {
        $(this).parent(".form-group").addClass("has-error");
    }
    else
    {
        submit.addClass("disabled").html("Please wait");
        $.post("email.php",form.serialize(),"text")
        .done(function(data){
            submit.removeClass("disabled").html("Mail Sent");
            alert(data);
        })
        .fail(function(data)
        {   submit.removeClass("disabled").html("Mail Failed");
        });
    }
});

基本上当我调用。parent()。addclass()…它一直到地址列上面的行div。我如何解决这个问题，使其直接位于名称输入元素(I。E父表单组div)

任何帮助都非常感谢