javascript - 修复窗口调整大小时带有侧边栏位置的导航栏

Question

我目前正在开发一个带有导航栏和侧边栏的网页。我的导航栏包含我的页面类别，即汽车和摩托车。单击后，将显示侧边栏，其中包含所选类别的库和引用。但是，无论何时调整窗口大小时，我的页面都会丢失其格式。侧边栏是固定的，但它可以滚动，看起来它与导航栏断开连接。如何固定他们的位置？

.navbar-inverse {
  background: black;
  font-size: 18px;
}

.navbar-inverse .navbar-nav>li>a:hover,
.navbar-inverse .navbar-nav>li>a:focus {
  color: #ffb143;
}

.navbar-inverse .navbar-brand:hover,
.navbar-inverse .navbar-brand:focus {
  color: white;
  font-size: 18px;
}

.navbar-brand {
  font-family: 'Lato', sans-serif;
  color: grey;
  font-size: 20px !important;
  margin: 0px;
}

td {
  font-weight: normal;
  padding-left: 55px;
  padding-right: 10px;
  padding-bottom: 18px;
  text-align: center;
}

th {
  font-weight: bold;
  padding-left: 65px;
  padding-right: 50px;
  overflow: hidden;
  white-space: nowrap;
  text-align: center;
}

table#bod {
  width: 100%;
  margin-left: 15px;
  margin-right: 45%;
}

#add {
  margin-left: 10px;
  width: 50px;
}

.sidebar {
  height: 100%;
  width: 200px;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: black;
  overflow-x: hidden;
  padding-top: 80px;
  margin-top: 45px;
}


/* Style sidebar links */

.sidebar a {
  padding: 6px 8px 6px 16px;
  text-decoration: none;
  font-size: 18px;
  color: white;
  display: block;
}


/* Style links on mouse-over */

.sidebar a:hover {
  color: #f1f1f1;
}


/* Style the main content */

.main {
  margin-left: 160px;
  /* Same as the width of the sidenav */
  padding: 0px 10px;
}


/* Add media queries for small screens (when the height of the screen is less than 450px, add a smaller padding and font-size) */

@media screen and (max-height: 450px) {
  .sidebar {
    padding-top: 15px;
  }
  .sidebar a {
    font-size: 18px;
  }
}

<nav class="navbar navbar-inverse" nav id="nav_bar">
  <div class="container-fluid">
    <div class="navbar-header">
      <a class="navbar-brand" href="index.php"> MRB Data Library </a>
    </div>
    <ul class="nav navbar-nav">
      <li class="active"><a href="#" style=>Cars</a></li>
      <li class="active"><a href="#">||</a></li>
      <li class="active"><a href="#">Motorcycle</a></li>
    </ul>
  </div>

</nav>


<form action="slider_update.php" method="POST">
  <div class="sidebar">
    <center>
      <h2 style="color: white">LIBRARY</h2>
    </center>
    <a href="index.php"><i class="fa fa-fw fa-home"></i> Home</a>
    <a href="#.php"><i class="fa fa-fw fa-folder"></i> Reference</a>
    </nav>
  </div>

窗口调整大小时的预期输出

窗口调整大小时的输出

Answer 1

如果我理解你的问题......那么我只是减少了侧边栏的 Z-index 并将所有元素的 box-sizing 设置为 border-box 并将 body 的边距和填充设置为 0

/* added this */
*{
padding : 0;
margin : 0;
box-sizing : border-box;
}
.navbar-inverse {
  background: black;
  font-size: 18px;
}

.navbar-inverse .navbar-nav>li>a:hover,
.navbar-inverse .navbar-nav>li>a:focus {
  color: #ffb143;
}

.navbar-inverse .navbar-brand:hover,
.navbar-inverse .navbar-brand:focus {
  color: white;
  font-size: 18px;
}

.navbar-brand {
  font-family: 'Lato', sans-serif;
  color: grey;
  font-size: 20px !important;
  margin: 0px;
}

td {
  font-weight: normal;
  padding-left: 55px;
  padding-right: 10px;
  padding-bottom: 18px;
  text-align: center;
}

th {
  font-weight: bold;
  padding-left: 65px;
  padding-right: 50px;
  overflow: hidden;
  white-space: nowrap;
  text-align: center;
}

table#bod {
  width: 100%;
  margin-left: 15px;
  margin-right: 45%;
}

#add {
  margin-left: 10px;
  width: 50px;
}

.sidebar {
  height: 100%;
  width: 200px;
  position: fixed;
  z-index: -1;
  top: 0;
  left: 0;
  background-color: black;
  overflow-x: hidden;
  padding-top: 80px;
  margin-top: 45px;
}


/* Style sidebar links */

.sidebar a {
  padding: 6px 8px 6px 16px;
  text-decoration: none;
  font-size: 18px;
  color: white;
  display: block;
}


/* Style links on mouse-over */

.sidebar a:hover {
  color: #f1f1f1;
}


/* Style the main content */

.main {
  margin-left: 160px;
  /* Same as the width of the sidenav */
  padding: 0px 10px;
}


/* Add media queries for small screens (when the height of the screen is less than 450px, add a smaller padding and font-size) */

@media screen and (max-height: 450px) {
  .sidebar {
    padding-top: 15px;
  }
  .sidebar a {
    font-size: 18px;
  }
}

<nav class="navbar navbar-inverse" nav id="nav_bar">
  <div class="container-fluid">
    <div class="navbar-header">
      <a class="navbar-brand" href="index.php"> MRB Data Library </a>
    </div>
    <ul class="nav navbar-nav">
      <li class="active"><a href="#" style=>Cars</a></li>
      <li class="active"><a href="#">||</a></li>
      <li class="active"><a href="#">Motorcycle</a></li>
    </ul>
  </div>

</nav>


<form action="slider_update.php" method="POST">
  <div class="sidebar">
    <center>
      <h2 style="color: white">LIBRARY</h2>
    </center>
    <a href="index.php"><i class="fa fa-fw fa-home"></i> Home</a>
    <a href="#.php"><i class="fa fa-fw fa-folder"></i> Reference</a>
    </nav>
  </div>