Div容器隐藏在另一个div后面，即使z-index为999

时间：2015-08-15 01:25:18

标签： javascript jquery html css

我正在制作一个新的网站布局，我遇到了问题。

我点击一个菜单，触发一些Javascript来显示一个菜单容器。这会出现使用jquery切换功能。它出现了一秒钟，然后当它完成div隐藏在我的主要内容div后面，所以你无法看到它。

我已将子菜单容器上的z-index更改为999，但没有任何区别。

如果单击Home按钮（在下面的代码中或在JSFiddle链接中），您应该看到我的意思。

JSFiddle

＆＃13;
＆＃13; 
html,
body {
  font-family: arial;
  margin: 0;
  padding: 0;
}
h1 {
  font-size: x-large;
  font-weight: bold;
  color: #403537;
}
header {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  font-size: xx-large;
  font-weight: bold;
  vertical-align: central;
  background-color: #403537;
}
#container {
  width: 1024px;
  margin-left: auto;
  margin-right: auto;
  background-color: #E5E2E4;
  border: #BFBDBE solid thin;
  border-radius: 5px;
  margin-top: 10px;
  margin-bottom: 10px;
  padding: 10px;
}
form.loginForm {
  width: 500px;
  margin-left: auto;
  margin-right: auto;
  background-color: #E5E2E4;
  border: #BFBDBE solid thin;
  border-radius: 5px;
  margin-top: 40px;
  margin-bottom: 10px;
  padding: 10px;
  clear: both;
  white-space: normal;
}
input[type=text],
input[type=password] {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  transition: border linear .2s, box-shadow linear .2s;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
  width: 360px;
  margin-top: 10px;
  margin-bottom: 10px;
  outline: none;
}
input[type=text]:required:focus,
input[type=password]:required:focus {
  box-shadow: 4px 4px 5px rgba(200, 0, 0, 0.40);
  outline: none;
}
input[type=text]:valid:focus,
input[type=password]:valid:focus {
  box-shadow: 4px 4px 5px rgba(27, 127, 18, 0.40);
  outline: none;
}
input[type=submit] {
  width: 120px;
  padding: 10px;
  color: white;
  background: #3239ff;
  /* Old browsers */
  background: -moz-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(1%, #3239ff), color-stop(100%, #0d1cc1));
  /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* Opera 11.10+ */
  background: -ms-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* IE10+ */
  background: linear-gradient(to bottom, #3239ff 1%, #0d1cc1 100%);
  /* W3C */
  filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#3239ff', endColorstr='#0d1cc1', GradientType=0);
  border-radius: 5px;
  border: black solid thin;
  font-size: medium;
  text-shadow: 2px 2px 1px rgba(0, 0, 0, 1);
}
label {
  width: 100px;
  margin-right: 10px;
  text-align: right;
}
#pageTitle {
  width: 800px;
  border-bottom: #BFBDBE solid thin;
  margin-left: auto;
  margin-right: auto;
}
footer {
  color: #BFBDBE;
  text-align: center;
  font-size: small;
  margin-top: 50px;
}
footer a {
  color: #BFBDBE;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}
#errorToolbox {
  position: absolute;
  width: auto;
  height: auto;
  border-radius: 5px;
  display: none;
  padding: 8px;
  background-color: #403537;
  z-index: 9999;
  color: white;
  box-shadow: 4px 4px 5px rgba(0, 0, 0, 0.40);
}
nav {
  background: #403537;
  /* Old browsers */
  background: -moz-linear-gradient(top, #403537 0%, #665459 100%);
  /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #403537), color-stop(100%, #665459));
  /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, #403537 0%, #665459 100%);
  /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top, #403537 0%, #665459 100%);
  /* Opera 11.10+ */
  background: -ms-linear-gradient(top, #403537 0%, #665459 100%);
  /* IE10+ */
  background: linear-gradient(to bottom, #403537 0%, #665459 100%);
  /* W3C */
  filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#403537', endColorstr='#665459', GradientType=0);
  height: 40px;
}
.menu {
  width: 1024px;
  margin-left: auto;
  margin-right: auto;
  height: calc(100% - 20px);
  padding: 10px;
}
a.menuHeaderButton {
  width: 100px;
  margin-left: 1px;
  margin-right: 1px;
  height: 100%;
  float: left;
  font-weight: bold;
  color: white;
  text-shadow: 4px 4px 7px rgba(117, 110, 110, 1);
  text-decoration: none;
}
.subMenuContainer {
  background-color: #403537;
  width: 150px;
  padding-top: 10px;
  padding-bottom: 10px;
  clear: both;
  display: none;
  z-index: 999;
}
.menuItem {
  clear: both;
  display: block;
  margin-left: 5px;
  margin-right: 5px;
  padding-top: 8px;
  padding-bottom: 8px;
  border-bottom: #BFBDBE solid thin;
  padding-left: 4px;
  transition: all linear .2s, box-shadow linear .2s;
  z-index: 999;
}
.menuItem:hover {
  background-color: #BFBDBE;
}
a.menuItem {
  text-decoration: none;
  color: white;
  z-index: 999;
}
＆＃13; 
<!DOCTYPE html>
<html>

<body>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  <script>
    function clickHeader(headerName) {
      //Get the position of the header menu
      var position = $("#header" + headerName).position();
      //alert("Left: " + position.left);
      $(".subMenuContainer").hide();
      $("#" + headerName).css({
        "margin-left": position.left
      })
      $("#" + headerName).toggle("medium");
    }
  </script>
  <header>
    <div style="width: 1024px; margin-left: auto; margin-right: auto;"></div>
  </header>
  <nav>
    <div class="menu"> <a class="menuHeaderButton" id="headerHome" href="javascript:clickHeader('Home');">Home</a>
      <a class="menuHeaderButton" id="headerBlog" href="javascript:clickHeader('Blog');">Blog</a>
      <a class="menuHeaderButton" id="headerCritiMon" href="#">CritiMon</a>

    </div>
    <div class="subMenuContainer" id="Home"> <a class="menuItem" href="#">Item 1</a>
      <a class="menuItem" href="#">Item 2</a>

    </div>
    <div class="subMenuContainer" id="Blog"> <a class="menuItem" href="#">Item 3</a>
      <a class="menuItem" href="#">Item 4</a>

    </div>
  </nav>
  <div id="container">
    <p>Hello, the quick brown fox jumped over the lazy dogs back.</p>
    <p>All good men must come to the aid of the party.</p>
  </div>
  <footer>&copy; 2010 - 2015 | <a href="#">Privacy Policy</a> 
  </footer>
</body>

</html>
＆＃13;
＆＃13;
＆＃13;

2 个答案:

答案 0 :(得分：8)

您忘记了position: absolute;上的.subMenuContainer。 z-index不会影响静态定位的元素。

  

对于定位框，'z-index'属性指定：

     
      
  1. 当前堆叠上下文中框的堆栈级别。
    2.   
  2. 框是否建立堆叠上下文。
    3.         

    http://www.w3.org/TR/CSS2/visuren.html#propdef-z-index

（强调我的） 

.subMenuContainer {
  background-color: #403537;
  position: absolute;
  width: 150px;
  padding-top: 10px;
  padding-bottom: 10px;
  clear: both;
  display: none;
  z-index: 999;
}

html,
body {
  font-family: arial;
  margin: 0;
  padding: 0;
}
h1 {
  font-size: x-large;
  font-weight: bold;
  color: #403537;
}
header {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  font-size: xx-large;
  font-weight: bold;
  vertical-align: central;
  background-color: #403537;
}
#container {
  width: 1024px;
  margin-left: auto;
  margin-right: auto;
  background-color: #E5E2E4;
  border: #BFBDBE solid thin;
  border-radius: 5px;
  margin-top: 10px;
  margin-bottom: 10px;
  padding: 10px;
}
form.loginForm {
  width: 500px;
  margin-left: auto;
  margin-right: auto;
  background-color: #E5E2E4;
  border: #BFBDBE solid thin;
  border-radius: 5px;
  margin-top: 40px;
  margin-bottom: 10px;
  padding: 10px;
  clear: both;
  white-space: normal;
}
input[type=text],
input[type=password] {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  transition: border linear .2s, box-shadow linear .2s;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
  width: 360px;
  margin-top: 10px;
  margin-bottom: 10px;
  outline: none;
}
input[type=text]:required:focus,
input[type=password]:required:focus {
  box-shadow: 4px 4px 5px rgba(200, 0, 0, 0.40);
  outline: none;
}
input[type=text]:valid:focus,
input[type=password]:valid:focus {
  box-shadow: 4px 4px 5px rgba(27, 127, 18, 0.40);
  outline: none;
}
input[type=submit] {
  width: 120px;
  padding: 10px;
  color: white;
  background: #3239ff;
  /* Old browsers */
  background: -moz-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(1%, #3239ff), color-stop(100%, #0d1cc1));
  /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* Opera 11.10+ */
  background: -ms-linear-gradient(top, #3239ff 1%, #0d1cc1 100%);
  /* IE10+ */
  background: linear-gradient(to bottom, #3239ff 1%, #0d1cc1 100%);
  /* W3C */
  filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#3239ff', endColorstr='#0d1cc1', GradientType=0);
  border-radius: 5px;
  border: black solid thin;
  font-size: medium;
  text-shadow: 2px 2px 1px rgba(0, 0, 0, 1);
}
label {
  width: 100px;
  margin-right: 10px;
  text-align: right;
}
#pageTitle {
  width: 800px;
  border-bottom: #BFBDBE solid thin;
  margin-left: auto;
  margin-right: auto;
}
footer {
  color: #BFBDBE;
  text-align: center;
  font-size: small;
  margin-top: 50px;
}
footer a {
  color: #BFBDBE;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}
#errorToolbox {
  position: absolute;
  width: auto;
  height: auto;
  border-radius: 5px;
  display: none;
  padding: 8px;
  background-color: #403537;
  z-index: 9999;
  color: white;
  box-shadow: 4px 4px 5px rgba(0, 0, 0, 0.40);
}
nav {
  background: #403537;
  /* Old browsers */
  background: -moz-linear-gradient(top, #403537 0%, #665459 100%);
  /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #403537), color-stop(100%, #665459));
  /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, #403537 0%, #665459 100%);
  /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top, #403537 0%, #665459 100%);
  /* Opera 11.10+ */
  background: -ms-linear-gradient(top, #403537 0%, #665459 100%);
  /* IE10+ */
  background: linear-gradient(to bottom, #403537 0%, #665459 100%);
  /* W3C */
  filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#403537', endColorstr='#665459', GradientType=0);
  height: 40px;
}
.menu {
  width: 1024px;
  margin-left: auto;
  margin-right: auto;
  height: calc(100% - 20px);
  padding: 10px;
}
a.menuHeaderButton {
  width: 100px;
  margin-left: 1px;
  margin-right: 1px;
  height: 100%;
  float: left;
  font-weight: bold;
  color: white;
  text-shadow: 4px 4px 7px rgba(117, 110, 110, 1);
  text-decoration: none;
}
.subMenuContainer {
  background-color: #403537;
  position: absolute;
  width: 150px;
  padding-top: 10px;
  padding-bottom: 10px;
  clear: both;
  display: none;
  z-index: 999;
}
.menuItem {
  clear: both;
  display: block;
  margin-left: 5px;
  margin-right: 5px;
  padding-top: 8px;
  padding-bottom: 8px;
  border-bottom: #BFBDBE solid thin;
  padding-left: 4px;
  transition: all linear .2s, box-shadow linear .2s;
  z-index: 999;
}
.menuItem:hover {
  background-color: #BFBDBE;
}
a.menuItem {
  text-decoration: none;
  color: white;
  z-index: 999;
}
<!DOCTYPE html>
<html>

<body>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  <script>
    function clickHeader(headerName) {
      //Get the position of the header menu
      var position = $("#header" + headerName).position();
      //alert("Left: " + position.left);
      $(".subMenuContainer").hide();
      $("#" + headerName).css({
        "margin-left": position.left
      })
      $("#" + headerName).toggle("medium");
    }
  </script>
  <header>
    <div style="width: 1024px; margin-left: auto; margin-right: auto;"></div>
  </header>
  <nav>
    <div class="menu"> <a class="menuHeaderButton" id="headerHome" href="javascript:clickHeader('Home');">Home</a>
      <a class="menuHeaderButton" id="headerBlog" href="javascript:clickHeader('Blog');">Blog</a>
      <a class="menuHeaderButton" id="headerCritiMon" href="#">CritiMon</a>

    </div>
    <div class="subMenuContainer" id="Home"> <a class="menuItem" href="#">Item 1</a>
      <a class="menuItem" href="#">Item 2</a>

    </div>
    <div class="subMenuContainer" id="Blog"> <a class="menuItem" href="#">Item 3</a>
      <a class="menuItem" href="#">Item 4</a>

    </div>
  </nav>
  <div id="container">
    <p>Hello, the quick brown fox jumped over the lazy dogs back.</p>
    <p>All good men must come to the aid of the party.</p>
  </div>
  <footer>&copy; 2010 - 2015 | <a href="#">Privacy Policy</a> 
  </footer>
</body>

</html>

答案 1 :(得分：2)

如果您将float: left添加到.subMenuContainer类，则下拉菜单会显示在堆栈顶部。

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