CSS过渡或动画从顶部:100％滑到底部:0: [英] CSS transition or animate slide up from top:100% to bottom:0

问题描述

内部div的高度可变，取决于内部文本的长度，该长度总是比外部div短.我希望当外部div悬停时，内部叠加层div从top:100％滑到bottom:0:我下面的CSS代码无法产生我想要的向上滑动效果.它只是在外部div的底部弹出内部div.

The inner div has a variable height depends on the length of the text inside, which is always shorter than the outer div. I'd like the inner overlay div to slide up from top:100% to bottom:0 when the outer div is hovered. My CSS code below does not produce the slide up effect I want. It simply pops up the inner div at the bottom of the outer div.

<div class="outer">
    <div class="inner">This is a content block.</div>
</div>

.outer {
    position:relative;
    background-color:#eee;
    width:150px; height:150px;
    overflow:hidden;
}
.inner {
    position:absolute; z-index:10;
    box-sizing:border-box; width:100%; padding:10px;
    background-color:rgba(0,0,0,0.5); color:#fff;
    left:0; right:0; top:100%; bottom:auto;
    transition:top 300ms, bottom 300ms;
}
.outer:hover .inner {
    top:auto; bottom:0;
}

推荐答案

您的代码无法正常工作，因为从/向 auto 的过渡不起作用.

your code cannot work because transition doesn't work from/to auto.

默认情况下，您可以设置bottom:0并使用transfom，例如

you could set bottom:0 by default and play with transfom, e.g.

.outer {
    position:relative;
    background-color:#eee;
    width:150px; height:150px;
    overflow:hidden;
}
.inner {
    position:absolute; z-index:10;
    box-sizing:border-box; width:100%; padding:10px;
    background-color:rgba(0,0,0,0.5); color:#fff;
    left:0; right:0; bottom:0;
transform: translateY(100%);
    transition: transform 300ms;
}
.outer:hover .inner {
    transform: translateY(0);
}

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