Question

每当我将鼠标悬停在它们上面时，我想让导航栏链接的背景颜色变深。它工作正常，但是当我更改填充（在这种情况下为0px）时它开始闪烁:(全屏查看以获得更好的效果）此外，图像链接与其他链接的高度不同（当折叠时，它具有正确的空白区域），并且我无法使用当前样式规则将其放在同一行中。

**编辑：它是由padding:0px!important引起的，但那是因为我不希望悬停的背景占据整个高度。如何使高度较低的悬停背景？

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" rel="stylesheet"/>

<style>       
    .navbar {
        min-height: 80px;
        font-size: 0.8rem;
        font-weight:500;
    }

    .navbar-brand {
        padding: 0 15px;
        height: 80px;
        line-height: 80px;
    }

    .navbar-toggle {
        /* (80px - button height 34px) / 2 = 23px */
        margin-top: 23px;
        padding: 9px 10px !important;
    }

    @media (min-width: 768px) {
        .navbar-nav > li > a {
            /* (80px - line-height of 27px) / 2 = 26.5px */
            padding-top: 26.5px;
            padding-bottom: 26.5px;
            line-height: 27px;
        }
    }
    .bottom-space {
        margin-bottom: 20px;
    }
    #navbar_logged_in > a:link {
        color: white ; 
    }
    #navbar_logged_in > a:hover {
        opacity:0.7 ; 
    }
    #navbar_logged_in > a:visited {
        color: white ;
    }

    #navbar_logged_in > li.nav-link{
        color:white;
    }

    .nav-pills .nav-link.active, .nav-pills .show > .nav-link{
        background-color: #17A2B8;
    }

    body {
        padding-top: 110px;
    }

    .main-nav a:hover {       
        background-color: #0D47A1!important;
        padding: 0px!important;

    }  
</style>
<nav id="navbar_logged_in" class="navbar navbar-expand-lg navbar-light bottom-space fixed-top" style="background: linear-gradient(to right, #3399ff , #1a8cff, #0080ff, #0073e6);">
    <div class="container">
        <a class="navbar-brand mx-auto" href="#">            
            Logo
        </a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse text-right" id="navbarTogglerDemo02">         
            <ul class="navbar-nav ml-auto mt-2 mt-lg-0">
                            <li class="nav-item main-nav">
                    <a class="nav-link" href="#" style="color:white;margin-right:25px;">
                        <img class="img-circle" src="Image" alt="Image" width="35" height="35" style="border-radius: 50%!important;">
                    </a>
                </li>
                <li class="nav-item main-nav">
                    <a id="homepage_link" class="nav-link" href="#" style="color:white">Homepage</a>
                </li>

                <li class="nav-item main-nav">
                    <a class="nav-link" href="#" style="color:white">About</a>
                </li>
                <li class="nav-item main-nav">
                    <a class="nav-link" href="#" style="color:white">Log Out</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

是什么造成的？我该如何解决？

由于

Answer 1

悬停中的填充导致问题：padding: 10px!important;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" rel="stylesheet"/>

<style>       
    .navbar {
        min-height: 80px;
        font-size: 0.8rem;
        font-weight:500;
    }

    .navbar-brand {
        padding: 0 15px;
        height: 80px;
        line-height: 80px;
    }

    .navbar-toggle {
        /* (80px - button height 34px) / 2 = 23px */
        margin-top: 23px;
        padding: 9px 10px !important;
    }

    @media (min-width: 768px) {
        .navbar-nav > li > a {
            /* (80px - line-height of 27px) / 2 = 26.5px */
            padding-top: 26.5px;
            padding-bottom: 26.5px;
            line-height: 27px;
        }
    }
    .bottom-space {
        margin-bottom: 20px;
    }
    #navbar_logged_in > a:link {
        color: white ; 
    }
    #navbar_logged_in > a:hover {
        opacity:0.7 ; 
    }
    #navbar_logged_in > a:visited {
        color: white ;
    }

    #navbar_logged_in > li.nav-link{
        color:white;
    }

    .nav-pills .nav-link.active, .nav-pills .show > .nav-link{
        background-color: #17A2B8;
    }

    body {
        padding-top: 110px;
    }

    .main-nav a:hover {       
        background-color: #0D47A1!important;
        

    }  
</style>
<nav id="navbar_logged_in" class="navbar navbar-expand-lg navbar-light bottom-space fixed-top" style="background: linear-gradient(to right, #3399ff , #1a8cff, #0080ff, #0073e6);">
    <div class="container">
        <a class="navbar-brand mx-auto" href="#">            
            Logo
        </a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse text-right" id="navbarTogglerDemo02">         
            <ul class="navbar-nav ml-auto mt-2 mt-lg-0">
                            <li class="nav-item main-nav">
                    <a class="nav-link" href="#" style="color:white;margin-right:25px;">
                        <img class="img-circle" src="Image" alt="Image" width="35" height="35" style="border-radius: 50%!important;">
                    </a>
                </li>
                <li class="nav-item main-nav">
                    <a id="homepage_link" class="nav-link" href="#" style="color:white">Homepage</a>
                </li>

                <li class="nav-item main-nav">
                    <a class="nav-link" href="#" style="color:white">About</a>
                </li>
                <li class="nav-item main-nav">
                    <a class="nav-link" href="#" style="color:white">Log Out</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

Answer 2

引起闪烁是因为当您悬停时，您正在移除填充，从而将元素从光标下方拉出。然后停止悬停并重新应用填充，将其放回光标下方，触发悬停状态。冲洗并重复。

要停止闪烁，您需要这两种样式一起工作：

@media (min-width: 768px) {
    .navbar-nav > li > a {
        padding-top: 26.5px;
        padding-bottom: 26.5px;
        line-height: 27px;
    }
}

.main-nav a:hover {       
    background-color: #0D47A1!important;
    padding: 0px!important;

}

如果您希望悬停背景占用更少的高度，请用边距替换您不想要背景的部分。这可能看起来像：

@media (min-width: 768px) {
    .navbar-nav > li > a {
        padding: 6.5px 8px; /* top/bottom, sides */
        margin: 20px 0px;
        line-height: 27px;
    }
}

.main-nav a:hover {       
    background-color: #0D47A1!important;
}

简而言之，不要在悬停时更改您的包装尺寸，如果您不想要背景，请使用margin代替padding

Bootstrap 4悬停在导航栏链接上会导致闪烁

2 个答案: