html - 当高度设置为 100% 时网格显示整页

Question

一段时间以来，我一直致力于聊天室布局，我的网站(我将展示)的主要概念是我有一个固定的导航栏和一个固定的底部页脚 (Bootstrap 4)。因此，在它们之间我添加了一个包含 3 列的网格系统 (3 + 6 + 3) 现在我希望网格系统成为高度，以便它覆盖导航栏和页脚之间的整个区域。但问题是当我给他们 100% 的高度时，滚动条出现并使它成为一个完整的页面网格。

我的代码:

.dropdown-toggle::after {
  content: none;
}

body {
  margin: 0;
  padding: 0;
}

<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<nav class="navbar navbar-expand navbar-dark" style="background-color:#3A5070">
  <a class="navbar-brand" href="#">LOGO</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav ml-auto">
      <li class="nav-item">
        <img src="https://image.flaticon.com/icons/svg/1156/1156949.svg" width="25" style="margin-top:10px;margin-right:15px;" />
      </li>
      <li class="nav-item">
        <img src="https://image.flaticon.com/icons/svg/813/813020.svg" width="25" style="margin-top:10px;margin-right:15px;" />
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          <img src="libs/images/icon.png" width="35" />
        </a>
        <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdown" style="margin-top:7px;border-radius:0px;width:110%;">
          <a class="dropdown-item" href="#">Edit Profile</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Logout</a>
        </div>
      </li>
    </ul>
  </div>
</nav>

<div class="row no-gutter" style="height:100%">
  <div class="col-3" style="background: orange;">col-3</div>
  <div class="col-6" style="background:black;">col-6</div>
  <div class="col-3" style="background: orange;">col-3</div>
</div>

<nav class="navbar fixed-bottom navbar-light " style="background-color:#3A5070">
  <a class="navbar-brand" href="#"></a>
</nav>

Answer 1

使用 calc() 计算元素的高度:

<style>
  .full_height {
    height: calc(100vh - 82px);
    overflow: auto;
  }
</style>

.full_height {
	height: calc(100vh - 82px);
	overflow: auto;
}

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.0/css/bootstrap.min.css" rel="stylesheet"/>

<nav class="navbar navbar-expand navbar-dark" style="background-color:#3A5070">
  <a class="navbar-brand" href="#">LOGO</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
    aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav ml-auto">
      <li class="nav-item">
        <img src="https://image.flaticon.com/icons/svg/1156/1156949.svg" width="25"
          style="margin-top:10px;margin-right:15px;" />
      </li>
      <li class="nav-item">
        <img src="https://image.flaticon.com/icons/svg/813/813020.svg" width="25"
          style="margin-top:10px;margin-right:15px;" />
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown"
          aria-haspopup="true" aria-expanded="false">
          <img src="libs/images/icon.png" width="35" />
        </a>
        <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdown"
          style="margin-top:7px;border-radius:0px;width:110%;">
          <a class="dropdown-item" href="#">Edit Profile</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Logout</a>
        </div>
      </li>
    </ul>
  </div>
</nav>

<div class="container-fluid full_height">
  <div class="row no-gutter text-center" style="height:100%">
    <div class="col-3" style="background: orange;">col-3</div>
    <div class="col-6" style="background:black;color:white;">col-6</div>
    <div class="col-3" style="background: orange;">col-3</div>
  </div>
</div>

<nav class="navbar fixed-bottom navbar-light " style="background-color:#3A5070">
  <a class="navbar-brand" href="#"></a>
</nav>

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