如何使标题固定且内容必须在已经固定的位置上滚动

Question

嗨，我有一种情况需要将标题1 保留为fixed，并重置content必须scroll

下图显示了它们：

以下是我当前的代码：

#wrapper {
    padding-left: 0;
    transition: all 0.5s ease;
    height: 100%;
}
#sidebar-wrapper {
    z-index: 1000;
    position: fixed;
    top: 0;
    left: 0;
    width: 210px;
    height: calc(80vh - 6px); /* As you give a border of 3px */
    overflow-y: auto;
    background: rgba(0,0,0,0.9);
    transition: all 0.5s ease;
    border: 3px solid red;
    color:white;
}
.stories-preview-wrapper{
  position: fixed;
  height: calc(20vh - 6px); /* As you give a border of 3px */
  bottom: 0;
  left: 0;
  overflow-y: auto;
  border: 3px solid green;
  width: 210px;
}

.header{
    z-index: 100001;
    color: #fff;
    display: block;
    text-align: center;
    border-bottom: 1px solid red;
}

<div id="wrapper" class="toggled hidden-xs">
        <!-- Sidebar -->
        <div id="sidebar-wrapper">
             <div class="header">
                 <h4>
                    Heading 1
                 </h4>
              </div>
                <ul class="sidebar-nav">
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                </ul>
        </div>
      <div class="stories-preview-wrapper">
              <div class="header">
                 <h4>
                    Heading 2
                 </h4>
              </div>
             <ul class="sidebar-nav">
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
              </ul>
      </div>
 </div>

请提前帮助我！！！

Answer 1

尝试将.header设置为position: sticky，并记住将top: 0设置

希望这会有所帮助！干杯

#wrapper {
    padding-left: 0;
    transition: all 0.5s ease;
    height: 100%;
}
#sidebar-wrapper {
    z-index: 1000;
    position: fixed;
    top: 0;
    left: 0;
    width: 210px;
    height: calc(80vh - 6px); /* As you give a border of 3px */
    overflow-y: auto;
    background: rgba(0,0,0,0.9);
    transition: all 0.5s ease;
    border: 3px solid red;
    color:white;
}
.stories-preview-wrapper{
  position: fixed;
  height: calc(20vh - 6px); /* As you give a border of 3px */
  bottom: 0;
  left: 0;
  overflow-y: auto;
  border: 3px solid green;
  width: 210px;
}

.header{
    z-index: 100001;
    color: #fff;
    background-color: #000000;
    padding: 5px;
    display: block;
    position: sticky;
    top: 0;
    text-align: center;
    border-bottom: 1px solid red;
}

<div id="wrapper" class="toggled hidden-xs">
        <!-- Sidebar -->
        <div id="sidebar-wrapper">
             <div class="header">
                 <h4>
                    Heading 1
                 </h4>
              </div>
                <ul class="sidebar-nav">
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                  <li>hello world</li>
                </ul>
        </div>
      <div class="stories-preview-wrapper">
              <div class="header">
                 <h4>
                    Heading 2
                 </h4>
              </div>
             <ul class="sidebar-nav">
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
                  <li>hello world 2</li>
              </ul>
      </div>
 </div>

Answer 2

使用以下内容更新您的CSS：

#sidebar-wrapper {
    overflow: hidden;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    position: fixed;
    top: 0;
    left: 0;
    width: 210px;
    height: calc(80vh - 6px); /* As you give a border of 3px */
    background: rgba(0,0,0,0.9);
    transition: all 0.5s ease;
    border: 3px solid red;
    color:white;
}

.sidebar-nav {
    overflow: auto;
}