3

嗨，我最近使用 bootstrap 4 offcanvas 模板来构建我的网站

http://v4-alpha.getbootstrap.com/examples/offcanvas/#

现在我想让我的侧边栏跟随用户滚动但引导程序删除了词缀类并建议使用 css 位置粘性。我试图这样做并以侧边栏为目标，但它搞砸了布局。定位 .nav 也不起作用

html

<div class="container-fluid header navbar-fixed-top">        
    <div class="row">
           <div class="hidden-md-up col-xs-2">
                <button type="button" class="btn btn-secondary" data-toggle="offcanvas"><i class="fa fa-bars"></i></button>
           </div>

           <div class="col-md-12 col-sm-8 col-xs-8">                        
                <img src="images/logo.gif" class="img-fluid center-block" alt="emblem">                        
           </div>
    </div>   
</div><!-- /HEADER -->

<div class="container-fluid">
    <div class="row row-offcanvas row-offcanvas-left">

        <div class="col-md-2 col-sm-2 col-xs-4 sidebar-offcanvas" id="sidebar">
            <ul class="nav nav-stacked">
                <li class="nav-item">
                    <a class="nav-link" href="#home">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#about">About Us</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#area">Locations</a>     
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#deals">Deals</a>     
                </li>                   
                <li class="nav-item">
                    <a class="nav-link" href="#contact">Contact Us</a>
                </li>
            </ul>
        </div><!-- /Navigation -->


            <section id="home">
                <div class="row">

                    <div class="col-md-6 col-md-offset-5 col-sm-8 col-sm-offset-2 col-xs-10 col-xs-offset-1">
                        <img src="images/mazda2.gif" alt="Mazda2" class="img-fluid center-block">
                    </div>

                    <div class="col-md-6 col-md-offset-5 col-xs-12 text-xs-center">                        
                        <h3>Perth, Western Australia</h3>                           
                    </div>

                </div>
            </section><!-- HOME -->

            <section id="about">
                <div class="about-me">
                    <h3>About Us</h3>

                </div>
            </section><!-- ABOUT -->

    </div><!--ROW -->       
</div><!-- CONTAINER-FLUID -->

CSS

 /*
 * Style tweaks
 * --------------------------------------------------
 */
html,
body {
  overflow-x: hidden; /* Prevent scroll on narrow devices */
}
body {
  padding-top: 7em;
  position: relative;
}

/*
 * Off Canvas
 * --------------------------------------------------
 */
@media screen and (max-width: 767px) {
  .row-offcanvas {
    position: relative;
    -webkit-transition: all .25s ease-out;
         -o-transition: all .25s ease-out;
            transition: all .25s ease-out;
  }

   .row-offcanvas-left {
    left: 0;
  }

  .row-offcanvas-right {
    right: 0;
  }

  .row-offcanvas-left
  .sidebar-offcanvas {
  left: -33%; /* 4 columns */
  }

  .row-offcanvas-right
  .sidebar-offcanvas {
    right: -33%; /* 4 columns */
  }

  .row-offcanvas-left.active {
     left: 33%; /* 4 columns */
   }

   .row-offcanvas-right.active {
     right: 33%; /* 4 columns */
   }

   .sidebar-offcanvas {
    position: absolute;
    top: 0;
    width: 33%; /* 4 columns */

  }
}

/*
  * Custom Style
  * --------------------------------------------------
  */

  #sidebar {
    background-color: white;
    position:absolute;
    height:100vh;
 }

  .header {
     background-color: #232323;
 }

 .btn-secondary {
     background-color: #232323;
     border-color: #232323;
     margin-top:0.3em;
 }

 /*
  * HOME
  */

 #home {
   background-color: #434343;
   height: 100vh;
   width: 100vw;
 }

这可能与我的侧边栏关闭画布和侧边栏位置有关。但是如果没有 mysidebar 绝对位置，我的部分内容就会被下推。我尝试删除它并使用 col-xx 类但不行:(

4

1 回答 1

0

我认为你应该使用：

@media screen and (min-width: 768px) {
  .sidebar-offcanvas .nav-stacked {
   position: fixed;
   top: 8em;
   width: 33%;
  } 
}

阅读更多关于position: fixed：Affix 在 Bootstrap 4 alpha 中不起作用

于 2016-05-01T12:32:06.290 回答