动画CSS3:显示+不透明度

Question

我遇到了CSS3动画的问题.

.child {
    opacity: 0;
    display: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    display: block;
}

此代码仅在我删除更改时才有效display.

我想在悬停后立即更改显示,但应使用过渡更改不透明度.

Answer 1

根据Michaels的回答,这是要使用的实际CSS代码

.parent:hover .child
{
    display: block;

    -webkit-animation: fadeInFromNone 0.5s ease-out;
    -moz-animation: fadeInFromNone 0.5s ease-out;
    -o-animation: fadeInFromNone 0.5s ease-out;
    animation: fadeInFromNone 0.5s ease-out;
}

@-webkit-keyframes fadeInFromNone {
    0% {
        display: none;
        opacity: 0;
    }

    1% {
        display: block;
        opacity: 0;
    }

    100% {
        display: block;
        opacity: 1;
    }
}

@-moz-keyframes fadeInFromNone {
    0% {
        display: none;
        opacity: 0;
    }

    1% {
        display: block;
        opacity: 0;
    }

    100% {
        display: block;
        opacity: 1;
    }
}

@-o-keyframes fadeInFromNone {
    0% {
        display: none;
        opacity: 0;
    }

    1% {
        display: block;
        opacity: 0;
    }

    100% {
        display: block;
        opacity: 1;
    }
}

@keyframes fadeInFromNone {
    0% {
        display: none;
        opacity: 0;
    }

    1% {
        display: block;
        opacity: 0;
    }

    100% {
        display: block;
        opacity: 1;
    }
}

Answer 2

您可以使用CSS动画:

0% display:none ; opacity: 0;
1% display: block ; opacity: 0;
100% display: block ; opacity: 1;

Answer 3

如果可能 - 使用visibility而不是display

例如:

.child {
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s, visibility 0.3s;
}

.parent:hover .child {
    visibility: visible;
    opacity: 1;
    transition: opacity 0.3s, visibility 0.3s;
}

Answer 4

此解决方法有效:

1. 定义一个"关键帧":

   @-webkit-keyframes fadeIn { 
     0% { opacity: 0; }
     20% { opacity: 0; }
     40% { opacity: 0.3; }
     60% { opacity: 0.5; }
     80% { opacity: 0.9; }
     100% { opacity: 1; }
   }
   
   @keyframes fadeIn {
     0% { opacity: 0; }
     20% { opacity: 0; }
     40% { opacity: 0.3; }
     60% { opacity: 0.5; }
     80% { opacity: 0.9; }
     100% { opacity: 1; }
   }
   

2. 在"悬停"上使用此"关键帧":

   div a span { 
     display: none;
   }
   
   div a:hover span {
     display: block;
   
     -webkit-animation-name: fadeIn;
     -webkit-animation-duration: 1s;
     animation-name: fadeIn;
     animation-duration: 1s;
   }
   

Answer 5

我用它来实现它.它们在悬停时褪色,但隐藏时不占空间,完美!

.child {
    height: 0px;
    opacity: 0;
    visibility: hidden;
    transition: all .5s ease-in-out;
}

.parent:hover child {
    height: auto;
    opacity: 1;
    visibility: visible;
}

Answer 6

我改变了一点,但结果很美.

.child {
    width: 0px;
    height: 0px;
    opacity: 0;
}

.parent:hover child {
    width: 150px;
    height: 300px;
    opacity: .9;
}

谢谢大家.

Answer 7

还有另一种很好的方法可以通过使用指针事件来完成这项工作:

.child {
    opacity: 0;
    pointer-events: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    pointer-events: all;
}

不幸的是,IE10及以下版本不支持此功能.