小编VIV*_*HRA的帖子

我一直试图检查div中是否存在类.但它总是产生一个长度为0.这是我的代码: -

<div id="accordion2" class="accordion" >
  <div class="accordion-group">
    <div class="accordion-heading"> <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseOne">
        <div class="align-nav arrow-active">OSTOMY PRODUCTS</div></a>
    </div>
    <div id="collapseOne" class="accordion-body in collapse">
        <div class="accordion-inner">
            <ul>
                <li><a href="#">Professional Resources</a></li>
                <li><a href="#">One-piece Pouching</a></li>
            </ul>
        </div>
    </div>
  </div>
  <div class="accordion-group">
    <div class="accordion-heading"> <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseTwo">
        <div class="align-nav arrow-inactive">LEARNING CENTER</div>
    </a> </div>
    <div id="collapseTwo" class="accordion-body collapse">
        <div class="accordion-inner">
            <ul>
                 <li><a href="#">Videos</a></li>
                 <li><a href="#">Before Your Surgery</a></li>
            </ul>
        </div>
    </div>
  </div>
  <div class="accordion-group">
    <div class="accordion-heading"> <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseThree">
      <div …

如何在没有jQuery的情况下使用JSON文档？getJSON()我不想调用这个方法,而是想设计自己的方法.我怎么做？

我收到了关于AJAX Post方法的400 Bad Request.我在Backend使用Spring Data Rest Services.下面是我在JS前端的代码

var url = "/udb/data/SecurityRoleGroup",
        groupData = {id:"",name:"",accesslevel:"",roles:[]};
        groupData.id = groupId.val();
        groupData.name = groupName.val();
        groupData.accesslevel = groupDescription.val();
        groupData.roles = multiselect_to.val();

        $.ajax(url, { type: 'POST',
            dataType: 'json',
            headers: {
                'X-CSRF-Token': _csrfGroup.val(),
                'Content-Type' : 'application/json'
            },
            data: JSON.stringify(groupData),
            contentType: 'application/json',
        })
        .done(function(results) {
            showMessage.html("Group details are saved successfully.");
            showMessage.removeClass().addClass("alert alert-success").show();
        })
        .fail( function(xhr, textStatus, errorThrown){
            showMessage.html("Error : Rolegroup AJAX request failed! Please try again.");
            showMessage.removeClass().addClass("alert alert-danger").show();
        });

虽然我正在序列化JSON数据.我仍然收到400 Bad Request错误.如果某些代码在后端中断或者发送到服务器的请求出现问题,是否会出现此错误？

JAVA实施

@RepositoryRestResource(collectionResourceRel = "SecurityRoleGroup", path = …