CSS3过渡向下滑动/向上滑动

Question

.header {
        position:fixed;
        top:0;
        left:0;
        width:100%;
        height:50px;
        z-index:2
}    
.menu ul {
        position:absolute;
        top:0;
        left:0;
        width:100%;
        -webkit-transform:translateY(-100%);
        -moz-transform:translateY(-100%);
        transform:translateY(-50%);
        -webkit-transition: all 0.5s ease-in-out;
        -moz-transition: all 0.5s ease-in-out;
        transition: all 0.5s ease-in-out;
    }

    .menu ul.is-visible {
        -webkit-transform:translateY(50px);
        -moz-transform:translateY(50px);
        transform:translateY(50px)
        -webkit-transition: all 0.5s ease-in-out;
        -moz-transition: all 0.5s ease-in-out;
        transition: all 0.5s ease-in-out;
    }

以上是我用来使用过渡元素切换菜单打开/关闭的CSS,用于向下滑动/向上滑动效果.

目前菜单从标题顶部滑动; 它是否有可能从顶部50px的标题底部滑动？

我仍在努力学习如何使用转换,所以我们非常感谢任何建议.

谢谢!

Answer 1

这是你想要的吗？

DEMO

你没有提供你的标记,所以我不得不猜.基本上,如果您将li文本包装在一个范围中并为其指定背景颜色以匹配标题(导航栏)的颜色,则可以在菜单放置到位时使其模糊.

此外,我没有打扰浮动和绝对定位.同样,我没有看到你的实际标记的好处,但是完成这个特定的布局是不必要的.

HTML:

<header>
    <ul class="menu">
        <li><span>Menu Item 1</span>
            <ul>
                <li><a href="#">Submenu Item 1</a></li>
                <li><a href="#">Submenu Item 2</a></li>
                <li><a href="#">Submenu Item 3</a></li>
                <li><a href="#">Submenu Item 4</a></li>
                <li><a href="#">Submenu Item 5</a></li>
            </ul>
        </li>
        <li><span>Menu Item 2</span>
            <ul>
                <li><a href="#">Submenu Item 1</a></li>
                <li><a href="#">Submenu Item 2</a></li>
            </ul>
        </li>
        <li><a href="">Menu Item 3</a></li>
        <li><span>Menu Item 4</span>
            <ul>
                <li><a href="#">Submenu Item 1</a></li>
            </ul>
        </li>        
    </ul>
</header>

CSS:

header {
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:50px;
    background-color: yellowgreen;
    font-family: sans-serif;
}
a {
    color: yellowgreen;
    text-decoration: none;
}
ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
ul.menu > li {
    float: left;
    line-height: 50px;
    text-align: center;
    color: white;
    width: 150px;
}
li span {
    height: 50px;
    width: 100%;
    display: block;
    background-color: yellowgreen;
    position: relative;
    z-index: 100;
    cursor:pointer;
}
ul.menu > li > a {
    color: white;
}
li > ul {
    background-color: white;
    color: yellowgreen;
    text-align: left;
    -webkit-transform:translateY(-200%);
    -moz-transform:translateY(-200%);
    transform:translateY(-100%);
    -webkit-transition: all 0.5s ease-in-out;
    -moz-transition: all 0.5s ease-in-out;
    transition: all 0.5s ease-in-out;
}
li > ul > li {
    border: 1px solid yellowgreen;
    border-top: none;
    padding: 0 10px;    
}
li:hover ul {
    opacity: 1;
    -webkit-transform:translateY(0px);
    -moz-transform:translateY(0px);
    transform:translateY(0px) -webkit-transition: all 0.5s ease-in-out;
    -moz-transition: all 0.5s ease-in-out;
    transition: all 0.5s ease-in-out;
}