jQuery生成的日期选择表单无法加载日期选择框

![screenshot](https://oss-cn-
hangzhou.aliyuncs.com/yqfiles/6a9ba2ffb64c1d6d7cd878102bbfb6ec39ea59d6.png)
如上图所示，当用户点击按钮时，添加一行新的表单，然而添加的表单无法选择日期。我试了一下如果直接手工复制同样的表单在页面中，可以正常填写的。难道js加载完成后再向页面添加的元素就无法加载js特效了么？求解！！！！
js代码如下：

<script type="text/javascript">
    $(document).ready(function(){
        $("#add_relation").click(function(){
            $("#relation").append('<div class="col-md-2"><div class="form-group"><input name="family_relation"placeholder="与本人关系"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="family_name"placeholder="姓名"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="family_age"placeholder="年龄"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="family_employer"placeholder="工作单位"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="family_position"placeholder="职位"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="family_contact"placeholder="联系方式"class="form-control"></div></div>');
            obj = document.getElementsByName("family_relation");
            if (obj.length >= 3) {
                $("#add_relation").remove('#add_relation');
            }
        });

        $("#add_experience").click(function(){
            $("#experience").append('<div class="col-md-2"><div class="input-group date-picker input-daterange"data-date-format="yyyy-mm-dd"><input name="old_employed_time"type="text" class="form-control" placeholder="入职时间"><span class="input-group-addon">to</span><input name="old_departure_time"type="text" class="form-control" placeholder="离职时间"></div></div><div class="col-md-2"><div class="form-group"><input name="old_company_name"placeholder="公司名称"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="old_company_position"placeholder="职位"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="old_company_salary"placeholder="薪资"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="old_company_references"placeholder="证明人"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="old_company_contact"placeholder="联系电话"class="form-control"></div></div>');
            obj = document.getElementsByName("old_employed_time");
            if (obj.length >= 3) {
                $("#add_experience").remove('#add_experience');
            }
        });

        $("#add_education").click(function(){
            $("#education").append('<div id="education"class="row"><div class="col-md-2"><div class="form-group"><input name="education_enrollment_date"data-date-format="yyyy-mm-dd"placeholder="入学时间"class="form-control form-control-inline date-picker"/></div></div><div class="col-md-2"><div class="form-group"><input name="education_graduation_date"data-date-format="yyyy-mm-dd"placeholder="毕业时间"class="form-control form-control-inline date-picker"/></div></div><div class="col-md-2"><div class="form-group"><input name="education_school_name"placeholder="所在院校"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="education_specialty"placeholder="所学专业"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="education_diploma"placeholder="学历"class="form-control"></div></div><div class="col-md-2"><div class="form-group"><input name="education_degree"placeholder="所获学位"class="form-control"></div></div></div>');
            obj = document.getElementsByName("education_enrollment_date");
            if (obj.length >= 3) {
                $("#add_education").remove('#add_education');
            }
        });
    });
</script>