Question 168457 in Html Question posted in
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Can a fixed drop down menu in HTML scroll to the bottom of its links?

I want a drop down nav bar that (with the header) covers the entire viewport. I do not want the content behind the nav drop down to scroll behind the drop down.

I’ve achieved this by using position: fixed on the header and nav elements. And when my menu button is clicked the body has overflow: hidden applied.

Problem is, on very small viewports the bottom nav list items fall outside the viewport and I can’t scroll down to see/click them.

Here’s my code.

header {
    height: 60px;
    background-color: green;
}

body.nav-shown {
      overflow: hidden;
}

body.nav-shown header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
}

body.nav-shown nav {
      position: fixed;
      top: 60px;
      left: 0;
      right: 0;
      min-height: calc(100vh - 60px);
      background-color: black;
      color: white;
      font-size: 30px;
      line-height: 3em;
      overflow: scroll;
}
<body class="nav-shown">

<header>
    
    <button class="nav-button">Menu</button>

    <nav>
        <ul>
      <li>Link1</li>
      <li>Link2</li>
      <li>Link3</li>
      <li>Link4</li>
      <li>Link5</li>
      <li>Link6</li>
      <li>Link7</li>
       <li>Link8</li>
      <li>Link9</li>
   </ul>
    </nav>

</header>
Tags:

2

Answers


  1. 0

    Fixed section should be set with width, height and top, bottom properties, otherwise it won’t recognise its size and position.

    In this case you can use max-height: 100%; to the nav.

    header {
  height: 60px;
  background-color: green;
}

body.nav-shown {
  overflow: hidden;
}

body.nav-shown header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
}

body.nav-shown nav {
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  min-height: calc(100vh - 60px);
  max-height: 100%;
  background-color: black;
  color: white;
  font-size: 30px;
  line-height: 3em;
  overflow: scroll;
}
    <body class="nav-shown">
  <header>
    <button class="nav-button">Menu</button>
    <nav>
      <ul>
        <li>Link1</li>
        <li>Link2</li>
        <li>Link3</li>
        <li>Link4</li>
        <li>Link5</li>
        <li>Link6</li>
        <li>Link7</li>
        <li>Link8</li>
        <li>Link9</li>
      </ul>
    </nav>
  </header>
</body>
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  2. 0

    You can give overflow: auto on the header element and set min-height to header element instead of nav element. Here is the updated code. Try that:-

     header {
        height: 60px;
        background-color: green;
    }

    body.nav-shown {
        overflow: hidden;
    }

    body.nav-shown header {
          position: fixed;
          top: 0;
          left: 0;
          right: 0;
          overflow: auto;
          min-height: calc(100vh - 60px);
    }



    body.nav-shown nav {
         position: absolute;
          top: 60px;
          left: 0;
          right: 0;
          background-color: black;
          color: white;
          font-size: 30px;
          line-height: 3em;
    }
        <body class="nav-shown">

    <header>
        
        <button class="nav-button">Menu</button>


        <nav>
            <ul>
          <li>Link1</li>
          <li>Link2</li>
          <li>Link3</li>
          <li>Link4</li>
          <li>Link5</li>
          <li>Link6</li>
          <li>Link7</li>
           <li>Link8</li>
          <li>Link9</li>
       </ul>
        </nav>


    </header>

    </body>
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