conceal the bootstrap navigation bar while the page is being

Question

conceal the bootstrap navigation bar while the page is being

Struggling to toggle a Bootstrap navbar on scroll? Need some guidance from the pros out there. I admit, my Bootstrap and jQuery skills are pretty basic. The browser console doesn't throw any errors, and I've experimented with fadeIn, fadeOut, addClass, and removeClass without success.

$(document).ready(function() {

  var banner = $("#navscroll");
  $(window).scroll(function() {
    var scroll = $(window).scrollTop();
    if (scroll >= banner.height()) {
      $("#banner").hide();

    } else {
      $("banner").show();
    }
  });

});

console.log();

body {
  background-color: azure;
}

.divi {
  width: 500px;
  height: 500px;
}

#divi1 {
  background-color: red;
}

#divi2 {
  background-color: greenyellow;
}

<!DOCTYPE html>
<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
  <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
  <!-- Stylesheet for Mysite -->


  <title>My Site</title>

</head>

<body>

  <!-- Banner -->
  <div id="banner" class="container-fluid">
    <nav id="navscroll" class="navbar navbar-toggleable-sm navbar-light fixed-top">
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
          </button>
      <a class="navbar-brand" href="#">My Site</a>
      <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
        <div class="navbar-nav">
          <a class="nav-item nav-link active" href="#">Me<span class="sr-only">(current)</span></a>
          <a class="nav-item nav-link" href="#">What I do</a>
          <a class="nav-item nav-link" href="#">Find Me</a>
        </div>
      </div>
    </nav>
  </div>
  <!-- Banner -->

  <!-- Divs -->
  <div class="container-fluid">
    <div id="divi1" class="divi"></div>
    <div id="divi2" class="divi"></div>
  </div>
  <!-- Divs -->



  <!-- jQuery first, then Tether, then Bootstrap JS. -->

  <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
</body>

</html>

javascript jquery html css twitter-bootstrap

Answer 1

Answer №1

There are a couple of issues that need to be addressed for your code to properly display the navbar when scrolling up:

The line $("banner").show(); should have "#" before banner.
When hiding an element, its height is not preserved. This causes unexpected behavior when checking the navbar height after it has been hidden. To resolve this, it is recommended to save the height beforehand and compare it with the saved variable.

Here is the corrected code:

$(document).ready(function() {
  var banner_height = $("#navscroll").height();
  var lastScrollTop = 0;
  $(window).scroll(function() {
    var scroll = $(window).scrollTop();
    var currScrollTop = $(this).scrollTop();
    if (scroll >= banner_height && currScrollTop > lastScrollTop) {
      $("#banner").hide();
    } else {
      $("#banner").show();
    }
    lastScrollTop = currScrollTop;

  });

});

body {
  background-color: azure;
}

.divi {
  width: 500px;
  height: 500px;
}

#divi1 {
  background-color: red;
}

#divi2 {
  background-color: greenyellow;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!DOCTYPE html>
<html lang="en">

<head>
  <!-- Necessary meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
  <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
  <!-- Stylesheet for Mysite -->

  <title>My Site</title>

</head>

<body>

  <!-- Banner -->
  <div id="banner" class="container-fluid">
    <nav id="navscroll" class="navbar navbar-toggleable-sm navbar-light fixed-top">
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
          </button>
      <a class="navbar-brand" href="#">My Site</a>
      <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
        <div class="navbar-nav">
          <a class="nav-item nav-link active" href="#">Me<span class="sr-only">(current)</span></a>
          <a class="nav-item nav-link" href="#">What I do</a>
          <a class="nav-item nav-link" href="#">Find Me</a>
        </div>
      </div>
    </nav>
  </div>
  <!-- Banner -->

  <!-- Divs -->
  <div class="container-fluid">
    <div id="divi1" class="divi"></div>
    <div id="divi2" class="divi"></div>
  </div>
  <!-- Divs -->

  <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
</body>

</html>

Answer 2

There are a couple of issues that need to be addressed for your code to properly display the navbar when scrolling up:

The line $("banner").show(); should have "#" before banner.
When hiding an element, its height is not preserved. This causes unexpected behavior when checking the navbar height after it has been hidden. To resolve this, it is recommended to save the height beforehand and compare it with the saved variable.

Here is the corrected code:

$(document).ready(function() {
  var banner_height = $("#navscroll").height();
  var lastScrollTop = 0;
  $(window).scroll(function() {
    var scroll = $(window).scrollTop();
    var currScrollTop = $(this).scrollTop();
    if (scroll >= banner_height && currScrollTop > lastScrollTop) {
      $("#banner").hide();
    } else {
      $("#banner").show();
    }
    lastScrollTop = currScrollTop;

  });

});

body {
  background-color: azure;
}

.divi {
  width: 500px;
  height: 500px;
}

#divi1 {
  background-color: red;
}

#divi2 {
  background-color: greenyellow;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!DOCTYPE html>
<html lang="en">

<head>
  <!-- Necessary meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
  <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
  <!-- Stylesheet for Mysite -->

  <title>My Site</title>

</head>

<body>

  <!-- Banner -->
  <div id="banner" class="container-fluid">
    <nav id="navscroll" class="navbar navbar-toggleable-sm navbar-light fixed-top">
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
          </button>
      <a class="navbar-brand" href="#">My Site</a>
      <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
        <div class="navbar-nav">
          <a class="nav-item nav-link active" href="#">Me<span class="sr-only">(current)</span></a>
          <a class="nav-item nav-link" href="#">What I do</a>
          <a class="nav-item nav-link" href="#">Find Me</a>
        </div>
      </div>
    </nav>
  </div>
  <!-- Banner -->

  <!-- Divs -->
  <div class="container-fluid">
    <div id="divi1" class="divi"></div>
    <div id="divi2" class="divi"></div>
  </div>
  <!-- Divs -->

  <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
</body>

</html>

Answer 3

Answer №2

Don't forget to set the banner height variable outside of the scroll function and also make sure to include the # symbol in your script. Your code should look something like this:

$(document).ready(function(){

                var banner = $("#navscroll");
                var bannerHeight = banner.height();
                $(window).scroll(function(){
                    var scroll = $(window).scrollTop();
                    if (scroll >= bannerHeight){
                        $("#banner").hide();
                    } else {
                        $("#banner").show();
                    }
                });

        });

Answer 4

Don't forget to set the banner height variable outside of the scroll function and also make sure to include the # symbol in your script. Your code should look something like this:

$(document).ready(function(){

                var banner = $("#navscroll");
                var bannerHeight = banner.height();
                $(window).scroll(function(){
                    var scroll = $(window).scrollTop();
                    if (scroll >= bannerHeight){
                        $("#banner").hide();
                    } else {
                        $("#banner").show();
                    }
                });

        });

Answer 5

Answer №3

I went ahead and made some adjustments to the code for you while also adding in some helpful comments. Feel free to open up the console and scroll to see the changes taking place.

The issue stemmed from comparing the scroll height to the banner height, which was experiencing a change from 40 to -16 when hidden. To remedy this, I made sure to save the banner's initial height beforehand.

        
$(document).ready(function(){
    var banner = $("#navscroll");
    var bannerStartHeight = $("#navscroll").height();
    
    $(window).scroll(function(){
        var scroll = $(window).scrollTop();
        
        console.log("SCROLL: "+scroll)
        console.log("BANNER HEIGHT:"+banner.height())
        console.log("BANNER START HEIGHT: "+bannerStartHeight)
        
        if (scroll >= bannerStartHeight){
            $("#banner").hide();
        } else {
            $("#banner").show(); // don't forget the #
        }
    });
});

I hope these changes are helpful to you!

Answer 6

I went ahead and made some adjustments to the code for you while also adding in some helpful comments. Feel free to open up the console and scroll to see the changes taking place.

The issue stemmed from comparing the scroll height to the banner height, which was experiencing a change from 40 to -16 when hidden. To remedy this, I made sure to save the banner's initial height beforehand.

        
$(document).ready(function(){
    var banner = $("#navscroll");
    var bannerStartHeight = $("#navscroll").height();
    
    $(window).scroll(function(){
        var scroll = $(window).scrollTop();
        
        console.log("SCROLL: "+scroll)
        console.log("BANNER HEIGHT:"+banner.height())
        console.log("BANNER START HEIGHT: "+bannerStartHeight)
        
        if (scroll >= bannerStartHeight){
            $("#banner").hide();
        } else {
            $("#banner").show(); // don't forget the #
        }
    });
});

I hope these changes are helpful to you!

Answer 7

Answer №4

It is recommended to calculate the banner height outside of the scroll function.

$(document).ready(function() {

  var banner = $("#navscroll");
  var bannerHgt = banner.height();
  $(window).scroll(function() {
    var scroll = $(window).scrollTop();
    if (scroll >= bannerHgt) {
      $("#banner").hide();
    } else {
      $("#banner").show();
    }
  });

});

console.log();

 body{
    
            background-color: azure;
        }

        .divi{

            width: 500px;
            height: 500px;
        }

        #divi1{

            background-color: red;
        }

        #divi2{

            background-color: greenyellow;
        }

<!DOCTYPE html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous"></aDoIDEWoOUDeILUWEODEWlOSDeSfLoWeEdesrrnTheyMlsdfvOWhoWS&DhttpmrnytzMLsOIffOEWhsuitmflash-fssSEWsletysOntsstESfPLEMNssiOEDE

Answer 8

It is recommended to calculate the banner height outside of the scroll function.

$(document).ready(function() {

  var banner = $("#navscroll");
  var bannerHgt = banner.height();
  $(window).scroll(function() {
    var scroll = $(window).scrollTop();
    if (scroll >= bannerHgt) {
      $("#banner").hide();
    } else {
      $("#banner").show();
    }
  });

});

console.log();

 body{
    
            background-color: azure;
        }

        .divi{

            width: 500px;
            height: 500px;
        }

        #divi1{

            background-color: red;
        }

        #divi2{

            background-color: greenyellow;
        }

<!DOCTYPE html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous"></aDoIDEWoOUDeILUWEODEWlOSDeSfLoWeEdesrrnTheyMlsdfvOWhoWS&DhttpmrnytzMLsOIffOEWhsuitmflash-fssSEWsletysOntsstESfPLEMNssiOEDE

conceal the bootstrap navigation bar while the page is being

Answer №1

Answer №2

Answer №3

Answer №4

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