How to fix menu with fadein effect?

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2

I have the following code that fixes the menu using bootstrap:

$(window).scroll(function(){
  scroll = $(window).scrollTop();
  if(scroll > 500) {
    $('.navbar').addClass('sticky-top')
  }
  else {
  $('.navbar').removeClass('sticky-top')
  }
  
})
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNavDropdown">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Features</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Pricing</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown link
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
    </ul>
  </div>
</nav>

<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

I would like to use animate so I can fix it with some fadein effect instead of it popping up at once on the screen but I’m not getting it.

Someone give me a light on how to fix the menu with effect?

html css twitter-bootstrap bootstrap-3
  • 1

    Dude, is your script a little fucked up or is it just me? It seems that it only appears once, then no further you run the screen again that the effect does not repeat... that’s exactly what you want?

  • @hugocsl put this script only as an example, the focus is to make a "fade" effect to display and hide the menu.

  • @hugocsl arranged to become easier to understand and help. I thank you from now on

2 answers

2

I made an option using two classes, one to remove the menu, another to put it back in place. However I do not use positon or display to make it disappear and come back it is always fixed, but I move it out of the screen. I preferred to use opacity and top. For giving display:block/none you don’t get a smooth transition understand.

inserir a descrição da imagem aqui

See how it looked in the example:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>Page Title</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" type="text/css" media="screen" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" />
  <link rel="stylesheet" type="text/css" media="screen" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" />
<style>

  .navbar {
    opacity: 1;
    transition: top 1s, opacity 1s;
  }
  .mostra {
    top: 0px !important;
    opacity: 1 !important;
}
  .esconde {
    top: -100px;
    opacity: 0;
}

</style>
</head>
<body>
  
  


  <nav class="navbar navbar-expand-lg navbar-light bg-light sticky-top">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNavDropdown">
      <ul class="navbar-nav">
        <li class="nav-item active">
          <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Features</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Pricing</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown link
          </a>
          <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
            <a class="dropdown-item" href="#">Action</a>
            <a class="dropdown-item" href="#">Another action</a>
            <a class="dropdown-item" href="#">Something else here</a>
          </div>
        </li>
      </ul>
    </div>
  </nav>


  <div style="height: 350vh;"></div>

  <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/js/bootstrap.bundle.min.js"></script>

  <script>
    $(window).scroll(function() {
      if ($(window).scrollTop() > 500 ){
        $('.navbar').addClass('mostra');
      } else {
        $('.navbar').removeClass('mostra');
      };   	
      if ($(window).scrollTop() > 1 ){
        $('.navbar').addClass('esconde');
      } else {
        $('.navbar').removeClass('esconde');
      };
    });
  </script>
</body>
</html>

  • When resizes the screen fills with bug. :/

  • @sam Uai young I did some tests here on all breacking-points and it worked normal, until I put some content on the page to test and I noticed no apparent bug, nor error in the console... What you presented there and in which browser?

  • I’m using Chrome itself. Run the snippet and put it in full screen and test mode. See that the effects don’t work like in normal mode.

  • @sam in Snippet here really seems like he doesn’t have any problem when you switch to "full screen" I believe it is pq he changes the CSS of the iframe in which the code is inside there for some reason stops working. But you can test there in a standard window and put in any resolution that works 100% ;)

2


Just make sure the nav has the class .sticky-top and apply the fadeIn(). But first you have to hide with .hide():

$(window).scroll(function(){
   var scroll = $(window).scrollTop();
   var nav = $('.navbar');
   if(scroll > 500) {
      if(!nav.hasClass('sticky-top')){
         nav.addClass('sticky-top')
         .hide()
         .fadeIn();
      }
   }else{
      nav.removeClass('sticky-top')
   }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNavDropdown">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Features</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Pricing</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown link
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
    </ul>
  </div>
</nav>

<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>

  • show! Thank you.

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