使用 z-index 将重叠 css3 过渡带到前面

Question

我正在创建一个投资组合页面来显示一些图像。当您将鼠标悬停在缩略图上时，我使用 CSS3 过渡将缩略图展开为全尺寸图像，但其他拇指位于展开元素的前面。我尝试使用 z-index 将它们强制到后面，但它不起作用。有没有办法在展开的时候把过渡元素带到顶层？这是我编写的代码的精简版本。当您将鼠标悬停在红色框上时，我希望绿色框留在展开的红色后面。

CSS:

* {
    box-sizing: border-box;
}
.row:after {
    content: "";
    clear: both;
    display: block;
}

[class*="col-"] {
    float: left;
    padding: 15px;
}
.col-1 {width: 8.33%;}
.col-2 {width: 16.66%;}
.col-3 {width: 25%;}
.col-4 {width: 33.33%;}
.col-5 {width: 41.66%;}
.col-6 {width: 50%;}
.col-7 {width: 58.33%;}
.col-8 {width: 66.66%;}
.col-9 {width: 75%;}
.col-10 {width: 83.33%;}
.col-11 {width: 91.66%;}
.col-12 {width: 100%;}

.grow1{
    background: red;
    background-size: contain;
    background-repeat: no-repeat;
    width: 100px;
    height: 50px;
    -webkit-transition: width 1s, height 1s; 
    transition: width 1s, height 1s;
    z-index: 1;
    }
.grow1:hover{
    background-size: contain;
    width:150px;
    height:70px;
    z-index: 2;
}
.grow2{
    background: green;
    background-size: contain;
    background-repeat: no-repeat;
    width: 100px;
    height: 50px;
    -webkit-transition: width 1s, height 1s; 
    transition: width 1s, height 1s;
    z-index: 1;
    }
.grow2:hover{
    background-size: contain;
    width:150px;
    height:70px;
    z-index: 2;
}

HTML:

<div class="row">
    <div class="col-4"></div>
    <div class="col-2">
        <div class="grow1"></div>
    </div>
    <div class="col-2">
        <div class="grow2"></div>
    </div>
    <div class="col-4"></div>

这里还有 Fiddle link：https://jsfiddle.net/timmyll/8nef4v88/1/

谢谢！

Answer 1

这在 z-index 中是可能的，但它只适用于绝对定位的元素。将 position: absolute; 添加到两个框并使用 .grow1:hover, .grow2:hover { z-index: 5; } 将悬停框置于最前面。

当您的鼠标离开第一个框时，第二个框将在第一个框的前面，而过渡仍然是运行。我想不出一个纯粹的 CSS 解决方法来避免这种情况。

Answer 2

尝试添加 position: absolute; 我已经在此处更新了您的代码，您应该相应地添加 position 的属性

即top: ?pxleft: ?px

.grow1{
    position: absolute;
    background: red;
    background-size: contain;
    background-repeat: no-repeat;
    width: 100px;
    height: 50px;
    -webkit-transition: width 1s, height 1s; 
    transition: width 1s, height 1s;
    z-index: 1;
    }
.grow1:hover{
    background-size: contain;
    width:150px;
    height:70px;
    z-index: 999;
}
.grow2{
    position: absolute;
    background: green;
    background-size: contain;
    background-repeat: no-repeat;
    width: 100px;
    height: 50px;
    -webkit-transition: width 1s, height 1s; 
    transition: width 1s, height 1s;
    z-index: 2;
    }
.grow2:hover{
    background-size: contain;
    width:150px;
    height:70px;
    z-index: 1;
}

Answer 3

添加一个转换，它将起作用

.grow1:hover{
    transform: translateZ(0px);
}

为了让它在悬停时继续工作，我添加了一个过渡：变换。

为了证明第二个元素也有效，我在其中做了一个 translateX

* {
    box-sizing: border-box;
}
.row:after {
    content: "";
    clear: both;
    display: block;
}

[class*="col-"] {
    float: left;
    padding: 15px;
}
.col-1 {width: 8.33%;}
.col-2 {width: 16.66%;}
.col-3 {width: 25%;}
.col-4 {width: 33.33%;}
.col-5 {width: 41.66%;}
.col-6 {width: 50%;}
.col-7 {width: 58.33%;}
.col-8 {width: 66.66%;}
.col-9 {width: 75%;}
.col-10 {width: 83.33%;}
.col-11 {width: 91.66%;}
.col-12 {width: 100%;}

.grow1{
 background: red;
 background-size: contain;
 background-repeat: no-repeat;
 width: 100px;
 height: 50px;
 -webkit-transition: width 1s, height 1s; 
 transition: width 1s, height 1s, transform 1s;
 z-index: 1;
 }
.grow1:hover{
 background-size: contain;
 width:150px;
 height:70px;
 z-index: 2;
    transform: translateZ(0px);
}
.grow2{
 background: green;
 background-size: contain;
 background-repeat: no-repeat;
 width: 100px;
 height: 50px;
 -webkit-transition: width 1s, height 1s; 
 transition: width 1s, height 1s, transform 1s;
 z-index: 1;
 }
.grow2:hover{
 background-size: contain;
 width:150px;
 height:70px;
 z-index: 2;
    transform: translateX(-50px);
}

<div class="row">
    <div class="col-4"></div>
    <div class="col-2">
        <div class="grow1"></div>
    </div>
    <div class="col-2">
        <div class="grow2"></div>
    </div>
    <div class="col-4"></div>

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