hover效果加边框不抖动
前两天遇到一个hover效果给整个div加边框的问题。
html 如下
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.offer-list{ &:hover{ border:solid 2px #027CFF; height:372px; margin: -1px -2px 0-2px; .offer-list-item{ margin-top: -1px; } } .underline{ border-bottom: solid 1px #e3e3e3; } ul{ margin-left: 10px; } .offer-list-item{ height: 372px; } }12345678910111213141516171819
遇到的主要问题是hover后文字抖动,并且边框不能完美覆盖之前每个div下部的分割线。
解决方案:
1 遮挡分割线,整个加hover的div上移1px。
2 解决抖动问题,减少div的height。
方向是这两个,但是.first-list 的margin上移带来了其他问题,就是虽然高度设了,但hover时还是会向下掉1px。
这个问题找了好久,发现原来外层div margin为负时,并不会把这个div块都带着移动,里层的li就没有跟着移动,所以出现了怎么调都还是会看到div块向下抖动的问题,并且下边框还出现了遮住1px的问题。问题是ul层也没有设置overflow:hidden。
后来想到了给li用一个margin:-1px。两个问题一起解决啦。不过下边框被遮住的应该是是因为div设置的高度值问题。
其实有种比较简单的解决方法,那就是hover之前给div加白色边框占位,hover改变border颜色。这样很简单,但是不够通用,在这里就用不了,因为页面上有一个div的左上角有一个背景图片,白色的边框会在上面留下痕迹。没办法用。
margin经常会出现无效的情况,之前有遇到过,在这里也总结一下。
margin-top失效
<div> <divclassdivclass="box1">float:left</div> <divclassdivclass="box2">clear:both;margin-top:20px;</div> </div> 1234
网上能找到的两种比较靠谱的解释:
1:“在CSS2.1中,水平的margin不会被折叠;垂直margin可能在一些盒模型中被折叠…” 2:当第一个层浮动,而第二个没浮动层的margin会被压缩,详见--浮动元素后非浮动元素的margin的处理。 得到解决问题思路:1一起浮动 2 两个div中间加一个div清除浮动。
2父元素里第一个子元素margin-top失效。它会默认为是父元素的margin。
解决办法:
1.给父容器box加overflow:hidden;属性
2.父容器box加border除none以外的属性
3.用父容器box的padding-top代替margin-top
知其然,知其所以然。
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