调整导航栏的大小后，为什么我的图像会消失

Question

我有一个响应式导航栏，并带有一个下拉菜单。当我调整浏览器大小以使其达到断点并导航到其移动视图时，下面的英雄图像将消失并且部分可见标题标签，我不确定并且看不到是什么原因造成的。任何帮助将不胜感激！

HTML

    <section class="navigation">
  <div class="nav-container">
    <div class="brand">
      <a href="#!">image</a>
    </div>
    <nav>
      <div class="nav-mobile"><a id="nav-toggle" href="#!"><span></span></a></div>
      <ul class="nav-list">
        <li>
          <a href="#!">header 10</a>
        </li>
        <li>
          <a href="#!">header 9</a>
          <ul class="nav-dropdown">
            <li>
              <a href="#!">header 8</a>
            </li>
            <li>
              <a href="#!">header 7</a>
            </li>
            <li>
              <a href="#!">header 6</a>
            </li>
                        <li>
              <a href="#!">header 5</a>
            </li>
                        <li>
              <a href="#!">header 4</a>
            </li>
          </ul>
        </li>
        <li>
          <a href="#!">header3</a>
        </li>
        <li>
          <a href="#!">header 2</a>
        </li>
                <li>
          <a href="#!">Header 1</a>
        </li>
      </ul>
    </nav>
  </div>
</section>

<div class="hero-image">
  <div class="hero-text">
    <h1>Bring Your Garden And Driveway to life </h1>
    <h2>Scroll Down To Learn More</h2>
  </div>
</div>

CSS

    @charset "UTF-8";
.navigation {
  height: 70px;
  background: #262626;
}

.brand {
  position: absolute;
  padding-left: 20px;
  float: left;
  line-height: 70px;
  text-transform: uppercase;
  font-size: 1.4em;
}
.brand a,
.brand a:visited {
  color: #ffffff;
  text-decoration: none;
}

.nav-container {
  max-width: 1000px;
  margin: 0 auto;
}

nav {
  float: right;
}
nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
nav ul li {
  float: left;
  position: relative;
}
nav ul li a,
nav ul li a:visited {
  display: block;
  padding: 0 20px;
  line-height: 70px;
  background: #262626;
  color: #ffffff;
  text-decoration: none;
}
nav ul li a:hover,
nav ul li a:visited:hover {
  color: grey;
}
nav ul li a:not(:only-child):after,
nav ul li a:visited:not(:only-child):after {
  padding-left: 4px;
  content: ' ▾';
}
nav ul li ul li {
  min-width: 190px;
}
nav ul li ul li a {
  padding: 15px;
  line-height: 20px;
}

.nav-dropdown {
  position: absolute;
  display: none;
  z-index: 1;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.15);
}

/* Mobile navigation */
.nav-mobile {
  display: none;
  position: absolute;
  top: 0;
  right: 0;
  background: #262626;
  height: 70px;
  width: 70px;
}

@media only screen and (max-width: 798px) {
  .nav-mobile {
    display: block;
  }

  nav {
    width: 100%;
    padding: 70px 0 15px;
  }
  nav ul {
    display: none;
  }
  nav ul li {
    float: none;
  }
  nav ul li a {
    padding: 15px;
    line-height: 20px;
  }
  nav ul li ul li a {
    padding-left: 30px;
  }

  .nav-dropdown {
    position: static;
  }
}
@media screen and (min-width: 799px) {
  .nav-list {
    display: block !important;
  }
}
#nav-toggle {
  position: absolute;
  left: 18px;
  top: 22px;
  cursor: pointer;
  padding: 10px 35px 16px 0px;
}
#nav-toggle span,
#nav-toggle span:before,
#nav-toggle span:after {
  cursor: pointer;
  border-radius: 1px;
  height: 5px;
  width: 35px;
  background: #ffffff;
  position: absolute;
  display: block;
  content: '';
  transition: all 300ms ease-in-out;
}
#nav-toggle span:before {
  top: -10px;
}
#nav-toggle span:after {
  bottom: -10px;
}
#nav-toggle.active span {
  background-color: transparent;
}
#nav-toggle.active span:before, #nav-toggle.active span:after {
  top: 0;
}
#nav-toggle.active span:before {
  transform: rotate(45deg);
}
#nav-toggle.active span:after {
  transform: rotate(-45deg);
}

body, html {
  height: 100%;
  margin: 0;
  font-family: 'Montserrat', sans-serif;
}

body {
  height: 1000px;
}

.hero-image {
  background-image: url(https://stmed.net/sites/default/files/leaves-wallpapers-25246-1391025.jpg);
  height: 50%;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

/*==========WELCOME-TEXT==========*/
.hero-text {
  text-align: center;
  color: white;
  font-family: 'Slabo 27px', serif;
  font-size: 26px;
}

.hero-text h2 {
  font-style: italic;
  font-size: 22px;
}

@media only screen and (max-width: 450px) {
  .hero-text h1 {
    font-size: 20px;
    font-family: 'Slabo 20px', serif;
  }

  .hero-text h2 {
    font-size: 18px;
  }
}

下面是我的代码的jsfiddle https://jsfiddle.net/wkqph6x4/1/

Answer 1

只需将Rouzbehs-MacBook-Pro-2:AirSim Rouzbeh$ ./setup.sh + set -e +++ dirname ./setup.sh ++ cd . ++ pwd + SCRIPT_DIR=/Users/Rouzbeh/BoxSync/Fall2018/AirSim + pushd /Users/Rouzbeh/BoxSync/Fall2018/AirSim + downloadHighPolySuv=true + [[ '' == \-\-\n\o\-\f\u\l\l\-\p\o\l\y\-\c\a\r ]] ++ uname + '[' Darwin == Darwin ']' + [[ ! -z '' ]] + brew tap llvm-hs/homebrew-llvm Updating Homebrew... ==> Auto-updated Homebrew! Updated 2 taps (homebrew/core, homebrew/cask). ==> Updated Formulae convox jenkins brew install llvm-5.0 ==> Installing llvm-5.0 from llvm-hs/llvm ==> Downloading http://releases.llvm.org/5.0.1/llvm-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/cfe-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--clang--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/libcxx-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--libcxx--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/lld-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--lld--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/polly-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--polly--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/clang-tools-extra-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--clang-tools-extra--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/openmp-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--openmp--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/libcxx-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--libcxx--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/libunwind-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--libunwind--5.0.1.tar.xz ==> Downloading http://releases.llvm.org/5.0.1/compiler-rt-5.0.1.src.tar.xz Already downloaded: /Users/Rouzbeh/Library/Caches/Homebrew/llvm-5.0--compiler-rt--5.0.1.tar.xz ==> cmake /private/tmp/llvm-5.0-20180826-50196-5rhe1j/llvm-5.0.1.src -DCMAKE_C_FLAGS_RELEASE=-DND ==> cmake --build . Last 15 lines from /Users/Rouzbeh/Library/Logs/Homebrew/llvm-5.0/02.cmake: [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_stacktrace_printer.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_stoptheworld_mac.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_suppressions.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_symbolizer.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_symbolizer_libbacktrace.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_symbolizer_mac.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_symbolizer_win.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_tls_get_addr.cc.o [ 94%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_thread_registry.cc.o [ 95%] Building CXX object lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.ios.dir/sanitizer_win.cc.o [ 95%] Built target RTSanitizerCommonNoTermination.ios make[3]: *** [all] Error 2 make[2]: *** [tools/clang/runtime/compiler-rt-stamps/compiler-rt-build] Error 2 make[1]: *** [tools/clang/runtime/CMakeFiles/compiler-rt.dir/all] Error 2 make: *** [all] Error 2 分配给width: 100%类。

我认为您的图片宽度大于783px。因此，只要div宽度低于783px，您的图像就会停止显示，.hero-image的宽度变为0px。

Answer 2

您需要在.hero-image类上指定宽度。在这种情况下，width: '100%';就足够了，尽管它可以是您想要的任何形式。

执行此操作后，您会注意到导航和英雄图像之间存在15px间隙，该间隙来自nav元素的底部填充。如果这是一种风格/设计选择，则无需担心删除或调整它。只是想抬起头来。

更新的小提琴：https://jsfiddle.net/wxbj0L17/1/

Answer 3

在媒体查询中触发798px以下的移动菜单

@media only screen and (max-width: 798px) {

两个方块使它消失。

nav {     宽度：100％;     填充：70px 0 15px;   }   导航ul {     显示：无；   }

Answer 4

这是正确的工作答案-即使在flex项目上设置宽度也解决了部分问题。我将nav { float: right }移到了799px以上的媒体查询中，然后在nav元素下方添加了一些样式（z索引和位置）。

更新的小提琴：https://jsfiddle.net/wkqph6x4/24/

(function($) { // Begin jQuery
  $(function() { // DOM ready
    // If a link has a dropdown, add sub menu toggle.
    $('nav ul li a:not(:only-child)').click(function(e) {
      $(this).siblings('.nav-dropdown').toggle();
      // Close one dropdown when selecting another
      $('.nav-dropdown').not($(this).siblings()).hide();
      e.stopPropagation();
    });
    // Clicking away from dropdown will remove the dropdown class
    $('html').click(function() {
      $('.nav-dropdown').hide();
    });
    // Toggle open and close nav styles on click
    $('#nav-toggle').click(function() {
      $('nav ul').slideToggle();
    });
    // Hamburger to X toggle
    $('#nav-toggle').on('click', function() {
      this.classList.toggle('active');
    });
  }); // end DOM ready
})(jQuery); // end jQuery

@charset "UTF-8";
.navigation {
  height: 70px;
  background: #262626;
}

.brand {
  position: absolute;
  padding-left: 20px;
  float: left;
  line-height: 70px;
  text-transform: uppercase;
  font-size: 1.4em;
}
.brand a,
.brand a:visited {
  color: #ffffff;
  text-decoration: none;
}

.nav-container {
  max-width: 1000px;
  margin: 0 auto;
}


nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
nav ul li {
  float: left;
  position: relative;
}
nav ul li a,
nav ul li a:visited {
  display: block;
  padding: 0 20px;
  line-height: 70px;
  background: #262626;
  color: #ffffff;
  text-decoration: none;
}
nav ul li a:hover,
nav ul li a:visited:hover {
  color: grey;
}
nav ul li a:not(:only-child):after,
nav ul li a:visited:not(:only-child):after {
  padding-left: 4px;
  content: ' ▾';
}
nav ul li ul li {
  min-width: 190px;
}
nav ul li ul li a {
  padding: 15px;
  line-height: 20px;
}

.nav-dropdown {
  position: absolute;
  display: none;
  z-index: 1;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.15);
}

/* Mobile navigation */
.nav-mobile {
  display: none;
  position: absolute;
  top: 0;
  right: 0;
  background: #262626;
  height: 70px;
  width: 70px;
}

@media only screen and (max-width: 798px) {
  .nav-mobile {
    display: block;
  }

  nav {
    width: 100%;
    padding: 70px 0 15px;
    z-index: 100;
    position: relative;
  }
  nav ul {
    display: none;
  }
  nav ul li {
    float: none;
  }
  nav ul li a {
    padding: 15px;
    line-height: 20px;
  }
  nav ul li ul li a {
    padding-left: 30px;
  }

  .nav-dropdown {
    position: static;
  }
}
@media screen and (min-width: 799px) {
  
  nav {
    float: right;
    
  }
  .nav-list {
    display: block !important;
  }
}
#nav-toggle {
  position: absolute;
  left: 18px;
  top: 22px;
  cursor: pointer;
  padding: 10px 35px 16px 0px;
}
#nav-toggle span,
#nav-toggle span:before,
#nav-toggle span:after {
  cursor: pointer;
  border-radius: 1px;
  height: 5px;
  width: 35px;
  background: #ffffff;
  position: absolute;
  display: block;
  content: '';
  transition: all 300ms ease-in-out;
}
#nav-toggle span:before {
  top: -10px;
}
#nav-toggle span:after {
  bottom: -10px;
}
#nav-toggle.active span {
  background-color: transparent;
}
#nav-toggle.active span:before, #nav-toggle.active span:after {
  top: 0;
}
#nav-toggle.active span:before {
  transform: rotate(45deg);
}
#nav-toggle.active span:after {
  transform: rotate(-45deg);
}

body, html {
  height: 100%;
  margin: 0;
  font-family: 'Montserrat', sans-serif;
}

body {
  height: 1000px;
}

.hero-image {
  background-image: url(https://stmed.net/sites/default/files/leaves-wallpapers-25246-1391025.jpg);
  height: 50%;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

/*==========WELCOME-TEXT==========*/
.hero-text {
  text-align: center;
  color: white;
  font-family: 'Slabo 27px', serif;
  font-size: 26px;
}

.hero-text h2 {
  font-style: italic;
  font-size: 22px;
}

@media only screen and (max-width: 450px) {
  .hero-text h1 {
    font-size: 20px;
    font-family: 'Slabo 20px', serif;
  }

  .hero-text h2 {
    font-size: 18px;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<section class="navigation">
  <div class="nav-container">
    <div class="brand">
      <a href="#!">image</a>
    </div>
    <nav>
      <div class="nav-mobile"><a id="nav-toggle" href="#!"><span></span></a></div>
      <ul class="nav-list">
        <li>
          <a href="#!">header 10</a>
        </li>
        <li>
          <a href="#!">header 9</a>
          <ul class="nav-dropdown">
            <li>
              <a href="#!">header 8</a>
            </li>
            <li>
              <a href="#!">header 7</a>
            </li>
            <li>
              <a href="#!">header 6</a>
            </li>
                        <li>
              <a href="#!">header 5</a>
            </li>
                        <li>
              <a href="#!">header 4</a>
            </li>
          </ul>
        </li>
        <li>
          <a href="#!">header3</a>
        </li>
        <li>
          <a href="#!">header 2</a>
        </li>
                <li>
          <a href="#!">Header 1</a>
        </li>
      </ul>
    </nav>
  </div>
</section>

<div class="hero-image">
  <div class="hero-text">
    <h1>Bring Your Garden And Driveway to life </h1>
    <h2>Scroll Down To Learn More</h2>
  </div>
</div>