仅在第二行＆＃39;中对齐弹性项目。由flex-wrap创建：wrap

时间：2017-09-15 10:25:16

标签： html css css3 flexbox responsive

我想调整项目（项目数量可以变化），这些项目通过flex-wrap推入第二行：当浏览器的窗口大小调整到900px以下时，将其换行到右侧。

image to clarify what I want

我使用了flex-wrap：wrap，因为最初的问题是，当浏览器窗口太小时，整个菜单栏太宽了。
包装解决了这个问题，但随后崩溃的子菜单“坚持”＃39;菜单栏的主要元素后面（例如链接7后面的链接3.1）



overlapping sub menu

如果有人能提供比柔性包装更好的解决方案：换行我很乐意这样做。

我尝试用不同版本的对齐内容来解决这个问题。但它要么根本不起作用，要么整个菜单栏都受到影响。

所以主要的问题是：如何只将这些项目对齐到＃39中的右侧;第二次弹性排＆＃39;？
我还创建了一支笔： [但我不能发布两个以上的链接，所以我要将笔发布到评论中]

＆＃13;
＆＃13; 
jQuery(document).ready(function($) {

  // add JS-classes into the HTML-Tag
  $('html').addClass('js');

  // add classes for sub menus and sub menus toggle button
  $(".site-nav li > ul").parent('li').addClass('has-sub-menu');
  $(".site-nav li > ul").addClass('sub-menu');

  // create button for expand- und collapse the menu and render it into the header
  var create_toggle_nav_button = ['<div class="toggle-site-nav">Menu</div>'].join("");
  $("header").append(create_toggle_nav_button);

  // create button for expand- und collapse the sub menu  for mobile view and add them to all sub menus
  var create_sub_toggle_button = ['<span class="toggle-sub-menu"></span>'].join("");
  $(".has-sub-menu > a").after(create_sub_toggle_button);

  // define variables
  var $menu = $('.site-nav'),
    $toggle_nav = $('.toggle-site-nav'),
    $toggle_sub_menu = $('.toggle-sub-menu');

  // collapse and expand function of the main menu
  $toggle_nav.click(function(e) {
    e.preventDefault();
    $menu.slideToggle();
  });

  // collapse and expand function of the drop down menu for mobile view
  $toggle_sub_menu.click(function(e) {
    e.preventDefault();
    var $this = $(this);
    $this.toggleClass('active').next('ul').slideToggle();
  });

  // display hidden elements again, when browserwindow is resized by user
  $(window).resize(function() {
    var w = $(window).width();
    if (w > 900) {
      $('.site-nav').removeAttr('style');
      $('.sub-menu').removeAttr('style');
    }
  });

  // collapse navigation automatically to the left, when it run out of the viewport
  $(".site-nav .has-sub-menu").on('mouseenter mouseleave', function(e) {

    var nav_element = $('ul:first', this);
    var element_offset = nav_element.offset();
    var element_offset_left = element_offset.left;
    var element_width = nav_element.width();
    var viewport_width = $(window).width();

    var element_in_viewport = (element_offset_left + element_width <= viewport_width);

    if (!element_in_viewport) {
      $(this).addClass('sub-left');
    } else {
      $(this).removeClass('sub-left');
    }
  });

});
＆＃13; 
* {
  margin: 0;
  padding: 0;
  list-style: none;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

body::after {
  content: '';
  position: fixed;
  bottom: 1em;
  right: 1em;
  opacity: 0.5;
  font-size: 0.8em;
  z-index: 9999;
}

header {
  width: 100%;
  background: white;
}

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

.logo {
  display: block;
  width: 100%;
  padding: 1em;
  text-decoration: none;
  color: gray;
  /* ? */
}

.site-nav {
  z-index: 9999;
}

.site-nav>ul {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: stretch;
  flex-wrap: wrap;
}

.site-nav li {
  display: inline-block;
  flex-wrap: wrap;
  width: auto;
  padding: 0;
  position: relative;
  z-index: 9999;
}

.site-nav a {
  display: inline-flex;
  align-content: stretch;
  padding: 1em;
  white-space: nowrap;
  text-decoration: none;
  height: 100%;
  width: 100%;
  color: white;
  /* text color of all */
  background: #5a595a;
  /* background color main nav Link 1 */
  border-top: 1px solid rgba(0, 0, 0, 0.5);
  z-index: 9999;
}

.site-nav a:hover {
  background: rgba(0, 0, 0, 0.4);
  /* mouseover color Link 1 and Link 1.1 */
}

.js .site-nav {
  display: none;
}

.js .sub-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0px;
}

.js .sub-menu .sub-menu {
  top: 0px;
  left: 100%;
}

.js .has-sub-menu {
  position: relative;
  top: 100%;
  left: 0px;
}

.sub-menu li:last-of-type {
  padding-bottom: 0;
}

.sub-menu a {
  background: #676567;
  /* background color menu 2.1 only */
}

.sub-menu .sub-menu a {
  background: #747274;
  /* background color menu 2.1.1 only */
}

.sub-menu .sub-menu a:hover {
  background: rgba(0, 0, 0, 0.4);
  /* mouseover color Link 1 and Link 1.1 */
}


/* toggles */

.toggle-site-nav {
  background: #5a595a;
  /* background color of menu button when resized */
  display: block;
  position: absolute;
  right: 0;
  top: 0;
  padding: 1em;
  color: white;
  /* text color of the word menu in menu button when resized */
  cursor: pointer;
  z-index: 9999;
}

.toggle-site-nav:hover {
  background: rgba(0, 0, 0, 0.5);
  /* mouseover color of menu button when resized */
}

.toggle-sub-menu {
  display: none;
}

.js .toggle-sub-menu {
  display: flex;
  position: absolute;
  align-content: center;
  right: 0em;
  top: 1.05em;
  /* hight of the borders */
  background: #817e81;
  /* backgound of annoying squares when resized */
  height: 15px;
  width: 15px;
  cursor: pointer;
  z-index: 10000;
}

.js .toggle-sub-menu.active {
  background: #DCDCDC;
  /* color of annoying square after clicking on it when resized */
}

.toggle-sub-menu:hover,
.toggle-sub-menu.active:hover {
  background-color: rgba(0, 0, 0, 0.4);
  /* mouseover of annoying squares when resized */
}

@media screen and (min-width:900px) {
  .logo {
    width: auto;
    float: left;
  }
  .site-nav {
    width: auto;
    display: block !important;
  }
  .site-nav a {
    border: none;
  }
  .site-nav li {
    width: auto;
    padding: 0;
  }
  .site-nav li:hover {
    background: rgba(52, 50, 52, 1);
    /* mouseover background color of all menu */
  }
  .has-sub-menu a {
    padding-right: 2em;
    /* check this value */
  }
  .has-sub-menu:after {
    /* check this for editing the stripes */
    display: flex;
    content: '';
    position: absolute;
    align-content: center;
    top: 1.2em;
    right: 0;
    width: 0.5em;
    height: 25%;
    background: #817e81;
    /* color of stripes in main menu when it has submenu */
  }
  /* sub menu */
  .site-nav li:hover>.sub-menu {
    display: block;
    position: absolute;
    width: 300px;
    padding: 0 25px 25px 25px;
    left: -25px;
  }
  .sub-menu {
    display: none;
  }
  .sub-menu li {
    width: 100%;
  }
  .sub-menu>a {
    width: 100%;
    display: block;
  }
  .has-sub-menu .has-sub-menu:after {
    background: #817e81;
    /* color of stripes of Link 2.1 menu when it has submenu */
  }
  .has-sub-menu .has-sub-menu:hover .sub-menu {
    display: block;
    position: absolute;
    width: 300px;
    padding: 0 25px 25px 25px;
    left: 224px;
    top: 0px;
  }
  .toggle-site-nav,
  .toggle-sub-menu {
    display: none !important;
  }
  /* navigations items, which collapse to the left */
  .sub-left>.sub-menu {
    left: auto;
    right: 0;
  }
  .site-nav .sub-menu .sub-left>.sub-menu {
    left: -275px;
  }
}

@media (max-width :800px) {
  .site-nav {
    z-index: 999999999999999999;
    margin-top: 25px;
  }
}
＆＃13; 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<header>
  <div class="container">

    <a href="#" class="logo"></a>
    <nav class="site-nav">
      <ul>
        <li><a href="#">Link 1</a></li>
        <li><a href="#">Link 2</a>
          <ul>
            <li><a href="#">Link 2.1</a></li>
            <li><a href="#">Link 2.1</a>
              <ul>
                <li><a href="#">Link 2.1.1</a></li>
                <li><a href="#">Link 2.1.2</a></li>
                <li><a href="#">Link 2.1.3</a></li>
                <li><a href="#">Link 2.1.4</a></li>
              </ul>
            </li>
            <li><a href="#">Link 2.1</a></li>
          </ul>
        </li>
        <li><a href="#">Link 3</a>
          <ul>
            <li><a href="#">Link 3.1</a></li>
            <li><a href="#">Link 3.2</a></li>
            <li><a href="#">Link 3.3</a></li>
            <li><a href="#">Link 3.4</a></li>
            <li><a href="#">Link 3.5</a></li>
          </ul>
        </li>
        <li><a href="#">Link 4</a></li>
        <li><a href="#">Link 5</a></li>
        <li><a href="#">Link 6</a></li>
        <li><a href="#">Link 7</a>
          <ul>
            <li><a href="#">Link 7.1</a></li>
            <li><a href="#">Link 7.2</a></li>
            <li><a href="#">Link 7.3</a>
              <ul>
                <li><a href="#">Link 7.3.1</a></li>
                <li><a href="#">Link 7.3.2</a></li>
                <li><a href="#">Link 7.3.3</a></li>
                <li><a href="#">Link 7.3.4</a></li>
                <li><a href="#">Link 7.3.5</a></li>
              </ul>
            </li>
            <li><a href="#">Link 7.4</a></li>
            <li><a href="#">Link 7.5</a></li>
          </ul>
        </li>
        <li><a href="#">Link 8</a></li>
      </ul>
    </nav>

  </div>
</header>
＆＃13;
＆＃13;
＆＃13;

1 个答案:

答案 0 :(得分：2)

将以下内容添加到site-nav：

@media screen and (min-width: 900px) {
  .site-nav {
    width: auto;
    display: flex;
  }
}

然后，您可以将margin-auto应用于ul，并将justify-content应用于flex-end（这将与li正确对齐。

您可能需要在margin-top上调整site-nav属性以正确对齐。

jQuery(document).ready(function($) {

  // add JS-classes into the HTML-Tag
  $('html').addClass('js');

  // add classes for sub menus and sub menus toggle button
  $(".site-nav li > ul").parent('li').addClass('has-sub-menu');
  $(".site-nav li > ul").addClass('sub-menu');

  // create button for expand- und collapse the menu and render it into the header
  var create_toggle_nav_button = ['<div class="toggle-site-nav">Menu</div>'].join("");
  $("header").append(create_toggle_nav_button);

  // create button for expand- und collapse the sub menu  for mobile view and add them to all sub menus
  var create_sub_toggle_button = ['<span class="toggle-sub-menu"></span>'].join("");
  $(".has-sub-menu > a").after(create_sub_toggle_button);

  // define variables
  var $menu = $('.site-nav'),
    $toggle_nav = $('.toggle-site-nav'),
    $toggle_sub_menu = $('.toggle-sub-menu');

  // collapse and expand function of the main menu
  $toggle_nav.click(function(e) {
    e.preventDefault();
    $menu.slideToggle();
  });

  // collapse and expand function of the drop down menu for mobile view
  $toggle_sub_menu.click(function(e) {
    e.preventDefault();
    var $this = $(this);
    $this.toggleClass('active').next('ul').slideToggle();
  });

  // display hidden elements again, when browserwindow is resized by user
  $(window).resize(function() {
    var w = $(window).width();
    if (w > 900) {
      $('.site-nav').removeAttr('style');
      $('.sub-menu').removeAttr('style');
    }
  });

  // collapse navigation automatically to the left, when it run out of the viewport
  $(".site-nav .has-sub-menu").on('mouseenter mouseleave', function(e) {

    var nav_element = $('ul:first', this);
    var element_offset = nav_element.offset();
    var element_offset_left = element_offset.left;
    var element_width = nav_element.width();
    var viewport_width = $(window).width();

    var element_in_viewport = (element_offset_left + element_width <= viewport_width);

    if (!element_in_viewport) {
      $(this).addClass('sub-left');
    } else {
      $(this).removeClass('sub-left');
    }
  });

});
* {
  margin: 0;
  padding: 0;
  list-style: none;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

body::after {
  content: '';
  position: fixed;
  bottom: 1em;
  right: 1em;
  opacity: 0.5;
  font-size: 0.8em;
  z-index: 9999;
}

header {
  width: 100%;
  background: white;
}

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

.logo {
  display: block;
  width: 100%;
  padding: 1em;
  text-decoration: none;
  color: gray;
  /* ? */
}

.site-nav {
  z-index: 9999;
}

.site-nav>ul {
  display: flex;
  flex-direction: row;
  justify-content: flex-end;
  align-items: stretch;
  flex-wrap: wrap;
  margin: auto;
}

.site-nav li {
  display: inline-block;
  flex-wrap: wrap;
  width: auto;
  padding: 0;
  position: relative;
  z-index: 9999;
}

.site-nav a {
  display: inline-flex;
  align-content: stretch;
  padding: 1em;
  white-space: nowrap;
  text-decoration: none;
  height: 100%;
  width: 100%;
  color: white;
  /* text color of all */
  background: #5a595a;
  /* background color main nav Link 1 */
  border-top: 1px solid rgba(0, 0, 0, 0.5);
  z-index: 9999;
}

.site-nav a:hover {
  background: rgba(0, 0, 0, 0.4);
  /* mouseover color Link 1 and Link 1.1 */
}

.js .site-nav {
  display: none;
}

.js .sub-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0px;
}

.js .sub-menu .sub-menu {
  top: 0px;
  left: 100%;
}

.js .has-sub-menu {
  position: relative;
  top: 100%;
  left: 0px;
}

.sub-menu li:last-of-type {
  padding-bottom: 0;
}

.sub-menu a {
  background: #676567;
  /* background color menu 2.1 only */
}

.sub-menu .sub-menu a {
  background: #747274;
  /* background color menu 2.1.1 only */
}

.sub-menu .sub-menu a:hover {
  background: rgba(0, 0, 0, 0.4);
  /* mouseover color Link 1 and Link 1.1 */
}


/* toggles */

.toggle-site-nav {
  background: #5a595a;
  /* background color of menu button when resized */
  display: block;
  position: absolute;
  right: 0;
  top: 0;
  padding: 1em;
  color: white;
  /* text color of the word menu in menu button when resized */
  cursor: pointer;
  z-index: 9999;
}

.toggle-site-nav:hover {
  background: rgba(0, 0, 0, 0.5);
  /* mouseover color of menu button when resized */
}

.toggle-sub-menu {
  display: none;
}

.js .toggle-sub-menu {
  display: flex;
  position: absolute;
  align-content: center;
  right: 0em;
  top: 1.05em;
  /* hight of the borders */
  background: #817e81;
  /* backgound of annoying squares when resized */
  height: 15px;
  width: 15px;
  cursor: pointer;
  z-index: 10000;
}

.js .toggle-sub-menu.active {
  background: #DCDCDC;
  /* color of annoying square after clicking on it when resized */
}

.toggle-sub-menu:hover,
.toggle-sub-menu.active:hover {
  background-color: rgba(0, 0, 0, 0.4);
  /* mouseover of annoying squares when resized */
}

@media screen and (min-width:900px) {
  .logo {
    width: auto;
    float: left;
  }
  .site-nav {
    width: auto;
    display: flex !important;
  }
  .site-nav a {
    border: none;
  }
  .site-nav li {
    width: auto;
    padding: 0;
  }
  .site-nav li:hover {
    background: rgba(52, 50, 52, 1);
    /* mouseover background color of all menu */
  }
  .has-sub-menu a {
    padding-right: 2em;
    /* check this value */
  }
  .has-sub-menu:after {
    /* check this for editing the stripes */
    display: flex;
    content: '';
    position: absolute;
    align-content: center;
    top: 1.2em;
    right: 0;
    width: 0.5em;
    height: 25%;
    background: #817e81;
    /* color of stripes in main menu when it has submenu */
  }
  /* sub menu */
  .site-nav li:hover>.sub-menu {
    display: block;
    position: absolute;
    width: 300px;
    padding: 0 25px 25px 25px;
    left: -25px;
  }
  .sub-menu {
    display: none;
  }
  .sub-menu li {
    width: 100%;
  }
  .sub-menu>a {
    width: 100%;
    display: block;
  }
  .has-sub-menu .has-sub-menu:after {
    background: #817e81;
    /* color of stripes of Link 2.1 menu when it has submenu */
  }
  .has-sub-menu .has-sub-menu:hover .sub-menu {
    display: block;
    position: absolute;
    width: 300px;
    padding: 0 25px 25px 25px;
    left: 224px;
    top: 0px;
  }
  .toggle-site-nav,
  .toggle-sub-menu {
    display: none !important;
  }
  /* navigations items, which collapse to the left */
  .sub-left>.sub-menu {
    left: auto;
    right: 0;
  }
  .site-nav .sub-menu .sub-left>.sub-menu {
    left: -275px;
  }
}

@media (max-width :800px) {
  .site-nav {
    z-index: 999999999999999999;
    margin-top: 18px;
  }
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<header>
  <div class="container">

    <a href="#" class="logo"></a>
    <nav class="site-nav">
      <ul>
        <li><a href="#">Link 1</a></li>
        <li><a href="#">Link 2</a>
          <ul>
            <li><a href="#">Link 2.1</a></li>
            <li><a href="#">Link 2.1</a>
              <ul>
                <li><a href="#">Link 2.1.1</a></li>
                <li><a href="#">Link 2.1.2</a></li>
                <li><a href="#">Link 2.1.3</a></li>
                <li><a href="#">Link 2.1.4</a></li>
              </ul>
            </li>
            <li><a href="#">Link 2.1</a></li>
          </ul>
        </li>
        <li><a href="#">Link 3</a>
          <ul>
            <li><a href="#">Link 3.1</a></li>
            <li><a href="#">Link 3.2</a></li>
            <li><a href="#">Link 3.3</a></li>
            <li><a href="#">Link 3.4</a></li>
            <li><a href="#">Link 3.5</a></li>
          </ul>
        </li>
        <li><a href="#">Link 4</a></li>
        <li><a href="#">Link 5</a></li>
        <li><a href="#">Link 6</a></li>
        <li><a href="#">Link 7</a>
          <ul>
            <li><a href="#">Link 7.1</a></li>
            <li><a href="#">Link 7.2</a></li>
            <li><a href="#">Link 7.3</a>
              <ul>
                <li><a href="#">Link 7.3.1</a></li>
                <li><a href="#">Link 7.3.2</a></li>
                <li><a href="#">Link 7.3.3</a></li>
                <li><a href="#">Link 7.3.4</a></li>
                <li><a href="#">Link 7.3.5</a></li>
              </ul>
            </li>
            <li><a href="#">Link 7.4</a></li>
            <li><a href="#">Link 7.5</a></li>
          </ul>
        </li>
        <li><a href="#">Link 8</a></li>
      </ul>
    </nav>

  </div>
</header>

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