我想在CSS中应用鼠标输出延迟

Question

我试图在鼠标输出事件开始CSS转换之前应用延迟.我的CSS代码如下,请让我知道如何在鼠标输出开始CSS转换之前应用时间延迟.

我希望在用户将鼠标指针移出菜单后,菜单保持稳定一段时间(例如3秒).

.timnav li .dropdown {
    width: auto;
    min-width: 0px;
    max-width: 230px;
    height: 0;
    position: absolute;
    overflow: hidden;
    z-index: 999;
    background:rgba(255, 255, 255, 0.8);
    }

.timnav li:hover .dropdown {
    min-height: 60px;
    max-height: 500px;
    height: auto;
    width: 100%;
    padding: 0;
            -webkit-transition: delay .5s ease-in-out;
        -moz-transition: delay .5s ease-in-out;
        -o-transition: delay .5s ease-in-out;
}

.timnav li .dropdown ul {
    margin: 0;
    margin-top:7px;


}

.timnav li .dropdown ul > li {
    display: block;
    width: 100%;
    float: left;
    text-align: left;
    height: auto;
    border-radius: none;
    padding-bottom:2px;
}


    .timnav li .dropdown  .dropdown2{
    display: none;
    width: 100%;
    float: left;
    text-align: left;
    height: auto;
    border-radius: none; 
}

    .timnav li .dropdown ul > li:hover .dropdown2{
    display: block;
    width: 100%;
    float: left;
    text-align: left;
    height: auto;
    border-radius: none;

}

    .timnav li .dropdown .dropdown2:hover {
    display: block;
    width: 100%;
    float: left;
    text-align: left;
    height: auto;
    border-radius: none;


}


    .timnav li .dropdown .dropdown2 li a {
    display: block;
    padding-left:7px !important;
    height:6 !important;
    padding-top:8px;
    background: url(../images/nav-bg.jpg) repeat; color:#fff;

}


.timnav li .dropdown ul > li a {
    display: block;
    line-height: 26px;
    height: 22px;
    padding: 10px;
    background: url(../images/nav-crrent.jpg) repeat; color:#FFFFFF;

}

.timnav ul .dropdown ul li:first-child a {
    border-radius: 0;
}

.timnav li .dropdown li a:hover {
    background: url(../images/nav-bg.jpg) repeat; color:#000;
}

Answer 1

您可以为转换添加延迟,语法如下:

transition: all 0.5s ease-in-out 3s;

所以

transition: <property> <duration> <timing-function> <delay>;

所有前缀版本的语法也相同.

我已经创建了一个这样的演示,因为你需要做一些有点棘手的事情,以使项目没有延迟,但在它之前延迟.

http://jsfiddle.net/pgqM2/

诀窍是重新定义转换,以便在没有悬停时添加3秒延迟,但在有悬停时有0秒延迟:

li ul {
    opacity: 0;
    transition: all 0.5s ease 3s;
}

li:hover ul {
    opacity: 1;
    transition: all 0.5s ease 0s;
}

Answer 2

transition-delayCSS中有一个属性.只需将其添加到您的代码中,您就可以获得所需的效果.

transition-delay:3s;

出于速记过渡属性的目的,这是一张总结它的图片

所以在你的情况下,它看起来像这样

div:hover {
  -webkit-transition: .5s ease-in-out 3s;
  -moz-transition: .5s ease-in-out 3s;
  -o-transition: .5s ease-in-out 3s;
  transition: .5s ease-in-out 3s;
  color: red;
  cursor: pointer;
}

<div>Hover me. There is a delay!</div>

这是一个小提琴演示