下拉菜单隐藏在图片后面

Posted

技术标签:

【中文标题】下拉菜单隐藏在图片后面【英文标题】：dropdown is hidden behind image 【发布时间】：2019-02-28 18:36:44 【问题描述】：

当向下滚动导航栏然后悬停正常工作时，我的下拉菜单隐藏在图像后面（猫头鹰 carousal 之一）。

问题仅显示在图像所在的上部区域。

我尝试通过提供 z-index.通过为导航栏提供比图像滑块更高的值。但这不起作用。

我也尝试过溢出值。

我给了溢出：可见；导航栏，但仍然不可见。

错误下拉菜单的屏幕截图

jQuery(document).ready(function($) 
    $("#owl-demo").owlCarousel(
        navigation : true,
        slideSpeed : 300,
        paginationSpeed : 500,
        items: 1,
        singleItem: true,
        autoPlay : 4000
    );
);

$('body').on('mouseenter mouseleave','.dropdown',function(e)
    var _d=$(e.target).closest('.dropdown');
    _d.addClass('show');
    setTimeout(function()
        _d[_d.is(':hover')?'addClass':'removeClass']('show');
        $('[data-toggle="dropdown"]', _d).attr('aria-expanded',_d.is(':hover'));
    ,300);
);
/*sticky header position*/
.sticky.is-sticky 
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 999;
    width: 100%;


header 
    background: transparent !important;



/*body */
    /*min-height: 1200px;*/
/**/
nav 
    background-color: #000000;
    min-height: 85px;
    color: white;
    opacity: 0.7;


.dropdown:hover>.dropdown-menu 
    display: block;
    overflow: visible;
    z-index: 1000;
    position: inherit;
    margin-top: 10%;


nav ul li a  
    color:  white !important;


.top-div 
    font-size: 14px;
    background-color: black;
    color: white;
    padding-top: 10px;


.top-div p .fa-map-marker
    margin-left: 4%;


.top-div p i 
    margin-right: 0.5%;
    margin-left: 3%;
    color: #c6b52d;


/* Ow; Slider CSS*/

#owl-demo 
    z-index: 30;


.owl-wrapper 
    positon: relative;


.owl-controls 
    position: absolute;
    bottom: 10px;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;


.owl-theme .owl-controls .owl-page span 
    background: #fff !important;


.owl-img 
    width: 100%;


.owl-text-overlay 
    position: absolute;
    text-align: center;
    width: 60%;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    color: #fff;
    background-color: rgba(0, 0, 0, 0.4);
    background: rgba(0, 0, 0, 0.4);
    padding-bottom: 20px;
    font-family: "Open Sans", sans-serif;
    border-radius: 15px 50px 30px 5px;

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Imagine</title>
    <link href="https://fonts.googleapis.com/css?family=Ubuntu:300,400,800" rel="stylesheet">
    <link rel="stylesheet" href="main.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.carousel.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.theme.min.css">

    <script src="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.carousel.min.js"></script>
   
</head>
<body>
<!--top header-->
<header>
    <!--most top info -->
    <!--<div style="height: 40px; background: red"></div>-->
    
    <!-- End most top info -->

    <nav class="navbar  navbar-expand-lg navbar-light top-navbar" data-toggle="sticky-onscroll">
        <div class="container">
            <a class="navbar-brand" href="#">
                <img src="assets/images/Logo-white.png"  >
            </a>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
                <ul class="navbar-nav pull-right">
                    <li class="nav-item">
                        <a class="nav-link active" href="#">Home</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="about-us.html">Who We Are</a>
                    </li>
                    <li class="nav-item dropdown">
                        <a class="nav-link dropdown-toggle" href="" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Dropdown link
                        </a>
                        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                            <a class="dropdown-item" href="#">Action</a>
                            <a class="dropdown-item" href="#">Another action</a>
                            <a class="dropdown-item" href="#">Something else here</a>
                        </div>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Support & Service</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Contact Us</a>
                    </li>

                </ul>

            </div>
        </div>
    </nav>

</header>


<div class="owl-carousel owl-theme" id="owl-demo">
    <div>
        <div class="owl-text-overlay hidden-xs">
            <h2 class="owl-title">Arrow</h2>
            <p class="owl-caption hidden-sm">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent iaculis purus vel enim suscipit, vitae volutpat ante scelerisque. Pellentesque blandit malesuada dui, sed aliquet risus molestie non.</p>
        </div><img class="owl-img" src="https://res.cloudinary.com/jbennett45/image/upload/v1474628443/arrow_dqnmmf.jpg"></div>
    <div>
        <div class="owl-text-overlay hidden-xs">
            <h2 class="owl-title">Flash</h2>
            <p class="owl-caption hidden-sm">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent iaculis purus vel enim suscipit, vitae volutpat ante scelerisque. Pellentesque blandit malesuada dui, sed aliquet risus molestie non.</p>
        </div><img class="owl-img" src="https://res.cloudinary.com/jbennett45/image/upload/v1474628444/flash_pxythx.jpg"></div>
</div>

【问题讨论】：

您是否尝试在您的 CSS 属性末尾添加 !important？试试z-index。您的 css 可能会被其他内容覆盖，这也取决于首先加载和最后加载的内容等。示例：z-index: 9999 !important; @Martin 我试过了，但还是不行。我刚刚发布了下拉错误的图像，请看一下。谢谢 你能在 JSFiddle 中设置它吗？看看会容易很多 我通过 github 页面 mohsinbhaai.github.io/imagine 实现了它，它很快就会工作。否则你会看到完整的代码或者你可以从这里下载github.com/mohsinbhaai/imagine 【参考方案1】：

将z-index 添加到nav。

z-index 属性指定元素的堆叠顺序。

Reference

jQuery(document).ready(function($) 
    $("#owl-demo").owlCarousel(
        navigation : true,
        slideSpeed : 300,
        paginationSpeed : 500,
        items: 1,
        singleItem: true,
        autoPlay : 4000
    );
);

$('body').on('mouseenter mouseleave','.dropdown',function(e)
    var _d=$(e.target).closest('.dropdown');
    _d.addClass('show');
    setTimeout(function()
        _d[_d.is(':hover')?'addClass':'removeClass']('show');
        $('[data-toggle="dropdown"]', _d).attr('aria-expanded',_d.is(':hover'));
    ,300);
);
/*sticky header position*/
.sticky.is-sticky 
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 999;
    width: 100%;


header 
    background: transparent !important;



/*body */
    /*min-height: 1200px;*/
/**/
nav 
    background-color: #000000;
    min-height: 85px;
    color: white;
    opacity: 0.7;
    z-index: 999999; //Add this


.dropdown:hover>.dropdown-menu 
    display: block;
    overflow: visible;
    z-index: 1000;
    position: inherit;
    margin-top: 10%;


nav ul li a  
    color:  white !important;


.top-div 
    font-size: 14px;
    background-color: black;
    color: white;
    padding-top: 10px;


.top-div p .fa-map-marker
    margin-left: 4%;


.top-div p i 
    margin-right: 0.5%;
    margin-left: 3%;
    color: #c6b52d;


/* Ow; Slider CSS*/

#owl-demo 
    z-index: 30;


.owl-wrapper 
    positon: relative;


.owl-controls 
    position: absolute;
    bottom: 10px;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;


.owl-theme .owl-controls .owl-page span 
    background: #fff !important;


.owl-img 
    width: 100%;


.owl-text-overlay 
    position: absolute;
    text-align: center;
    width: 60%;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    color: #fff;
    background-color: rgba(0, 0, 0, 0.4);
    background: rgba(0, 0, 0, 0.4);
    padding-bottom: 20px;
    font-family: "Open Sans", sans-serif;
    border-radius: 15px 50px 30px 5px;

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Imagine</title>
    <link href="https://fonts.googleapis.com/css?family=Ubuntu:300,400,800" rel="stylesheet">
    <link rel="stylesheet" href="main.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.carousel.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.theme.min.css">

    <script src="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.carousel.min.js"></script>
   
</head>
<body>
<!--top header-->
<header>
    <!--most top info -->
    <!--<div style="height: 40px; background: red"></div>-->
    
    <!-- End most top info -->

    <nav class="navbar  navbar-expand-lg navbar-light top-navbar" data-toggle="sticky-onscroll">
        <div class="container">
            <a class="navbar-brand" href="#">
                <img src="assets/images/Logo-white.png"  >
            </a>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
                <ul class="navbar-nav pull-right">
                    <li class="nav-item">
                        <a class="nav-link active" href="#">Home</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="about-us.html">Who We Are</a>
                    </li>
                    <li class="nav-item dropdown">
                        <a class="nav-link dropdown-toggle" href="" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Dropdown link
                        </a>
                        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                            <a class="dropdown-item" href="#">Action</a>
                            <a class="dropdown-item" href="#">Another action</a>
                            <a class="dropdown-item" href="#">Something else here</a>
                        </div>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Support & Service</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Contact Us</a>
                    </li>

                </ul>

            </div>
        </div>
    </nav>

</header>


<div class="owl-carousel owl-theme" id="owl-demo">
    <div>
        <div class="owl-text-overlay hidden-xs">
            <h2 class="owl-title">Arrow</h2>
            <p class="owl-caption hidden-sm">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent iaculis purus vel enim suscipit, vitae volutpat ante scelerisque. Pellentesque blandit malesuada dui, sed aliquet risus molestie non.</p>
        </div><img class="owl-img" src="https://res.cloudinary.com/jbennett45/image/upload/v1474628443/arrow_dqnmmf.jpg"></div>
    <div>
        <div class="owl-text-overlay hidden-xs">
            <h2 class="owl-title">Flash</h2>
            <p class="owl-caption hidden-sm">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent iaculis purus vel enim suscipit, vitae volutpat ante scelerisque. Pellentesque blandit malesuada dui, sed aliquet risus molestie non.</p>
        </div><img class="owl-img" src="https://res.cloudinary.com/jbennett45/image/upload/v1474628444/flash_pxythx.jpg"></div>
</div>

【讨论】：

将 z-index 添加到导航类。 这不起作用我添加了我面临的问题的屏幕截图，请查看问题区域图像是否存在。谢谢 是的，这个问题已经解决了。你可以运行这段代码并全屏打开，看看这段代码运行良好。 我粘贴整个代码。现在图像滑块被隐藏，下拉菜单工作正常。但我也想要图像滑块。请查看代码github.com/mohsinbhaai/imagine 并在这里直播mohsinbhaai.github.io/imagine 谢谢你 我在您的代码导航中看不到 z-index。添加后它对我来说效果很好。甚至图像滑块也能正常工作。您已将z-index 添加到.dropdown:hover&gt;.dropdown-menu，这是导致此问题的原因。【参考方案2】：

您需要将z-index: 999 添加到.navbar 类。这是下拉菜单的整体父级：

jQuery(document).ready(function($) 
    $("#owl-demo").owlCarousel(
        navigation : true,
        slideSpeed : 300,
        paginationSpeed : 500,
        items: 1,
        singleItem: true,
        autoPlay : 4000
    );
);

$('body').on('mouseenter mouseleave','.dropdown',function(e)
    var _d=$(e.target).closest('.dropdown');
    _d.addClass('show');
    setTimeout(function()
        _d[_d.is(':hover')?'addClass':'removeClass']('show');
        $('[data-toggle="dropdown"]', _d).attr('aria-expanded',_d.is(':hover'));
    ,300);
);
/*sticky header position*/
.sticky.is-sticky 
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 999;
    width: 100%;


header 
    background: transparent !important;



/*body */
    /*min-height: 1200px;*/
/**/
nav 
    background-color: #000000;
    min-height: 85px;
    color: white;
    opacity: 0.7;


.dropdown:hover>.dropdown-menu 
    display: block;
    overflow: visible;
    z-index: 1000;
    position: inherit;
    margin-top: 10%;


.navbar 
  z-index: 999;


nav ul li a  
    color:  grey !important;


.top-div 
    font-size: 14px;
    background-color: black;
    color: white;
    padding-top: 10px;


.top-div p .fa-map-marker
    margin-left: 4%;


.top-div p i 
    margin-right: 0.5%;
    margin-left: 3%;
    color: #c6b52d;


/* Ow; Slider CSS*/

#owl-demo 
    z-index: 30;


.owl-wrapper 
    positon: relative;


.owl-controls 
    position: absolute;
    bottom: 10px;
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;


.owl-theme .owl-controls .owl-page span 
    background: #fff !important;


.owl-img 
    width: 100%;


.owl-text-overlay 
    position: absolute;
    text-align: center;
    width: 60%;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    color: #fff;
    background-color: rgba(0, 0, 0, 0.4);
    background: rgba(0, 0, 0, 0.4);
    padding-bottom: 20px;
    font-family: "Open Sans", sans-serif;
    border-radius: 15px 50px 30px 5px;

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Imagine</title>
    <link href="https://fonts.googleapis.com/css?family=Ubuntu:300,400,800" rel="stylesheet">
    <link rel="stylesheet" href="main.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.carousel.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.theme.min.css">

    <script src="https://cdnjs.cloudflare.com/ajax/libs/owl-carousel/1.3.3/owl.carousel.min.js"></script>
   
</head>
<body>
<!--top header-->
<header>
    <!--most top info -->
    <!--<div style="height: 40px; background: red"></div>-->
    
    <!-- End most top info -->

    <nav class="navbar  navbar-expand-lg navbar-light top-navbar" data-toggle="sticky-onscroll">
        <div class="container">
            <a class="navbar-brand" href="#">
                <img src="assets/images/Logo-white.png"  >
            </a>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
                <ul class="navbar-nav pull-right">
                    <li class="nav-item">
                        <a class="nav-link active" href="#">Home</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="about-us.html">Who We Are</a>
                    </li>
                    <li class="nav-item dropdown">
                        <a class="nav-link dropdown-toggle" href="" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Dropdown link
                        </a>
                        <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                            <a class="dropdown-item" href="#">Action</a>
                            <a class="dropdown-item" href="#">Another action</a>
                            <a class="dropdown-item" href="#">Something else here</a>
                        </div>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Support & Service</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Contact Us</a>
                    </li>

                </ul>

            </div>
        </div>
    </nav>

</header>


<div class="owl-carousel owl-theme" id="owl-demo">
    <div>
        <div class="owl-text-overlay hidden-xs">
            <h2 class="owl-title">Arrow</h2>
            <p class="owl-caption hidden-sm">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent iaculis purus vel enim suscipit, vitae volutpat ante scelerisque. Pellentesque blandit malesuada dui, sed aliquet risus molestie non.</p>
        </div><img class="owl-img" src="https://res.cloudinary.com/jbennett45/image/upload/v1474628443/arrow_dqnmmf.jpg"></div>
    <div>
        <div class="owl-text-overlay hidden-xs">
            <h2 class="owl-title">Flash</h2>
            <p class="owl-caption hidden-sm">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent iaculis purus vel enim suscipit, vitae volutpat ante scelerisque. Pellentesque blandit malesuada dui, sed aliquet risus molestie non.</p>
        </div><img class="owl-img" src="https://res.cloudinary.com/jbennett45/image/upload/v1474628444/flash_pxythx.jpg"></div>
</div>

只是一个旁注：您可能想要更改子菜单项的颜色文本，因为它们当前是白色的，与背景图像匹配并且不可见。

【讨论】：

【参考方案3】：

只需将 z-index 添加到下拉列表中，它应该大于图像及其父级的 z-index（如果有的话）。

【讨论】：

【参考方案4】：

如果 Z-index 不起作用，另一种可能是溢出设置为隐藏。这就是我刚才发生的事情。

【讨论】：

以上是关于下拉菜单隐藏在图片后面的主要内容，如果未能解决你的问题，请参考以下文章

下拉菜单隐藏在 IE 中的其他元素后面

Bootstrap 模态中选择的下拉菜单隐藏在模态页脚后面

下拉菜单打不开

jquery 下拉菜单

mouseenter 上的 angular-bootstrap 下拉菜单，并在单击之前保持下拉菜单隐藏。

单击时切换下拉菜单并隐藏所有其他下拉菜单