Bootstrap 3 mouseover图像响应 [英] Bootstrap 3 mouseover image responsive

问题描述

对于Bootstrap 3的响应式图像鼠标悬停是否有任何解决方案？

Is there any solution for responsive image mouseover for Bootstrap 3?

这是我的代码： http://jsfiddle.net/4gac7/

.image{
background-image:url("http://placehold.it/350x150/000/fff");
width:350px; /* responsive possible ?? */
height:150px; 

}
.image:hover{
background-image:url("http://placehold.it/350x150/ccc/fff");
}

谢谢！

推荐答案

它需要更多HTML代码，但您可以使用与 http://alistapart.com/article/creating-intrinsic-ratios-for-video/ 。您需要在某处设置宽度（因为背景图像没有内部尺寸），但这可能来自父元素。基本上：

It will need more HTML code, but you can use the same basic technique as http://alistapart.com/article/creating-intrinsic-ratios-for-video/. You will need to set a width somewhere (because background images don't have intrinsic dimensions), but that could come from a parent element. Essentially:

<div class="wrapper-with-intrinsic-ratio"><div class="element-to-stretch"></div></div>

.wrapper-with-intrinsic-ratio {
    position: relative;
    padding-bottom: 20%; /* Adjust this to suit the aspect ratio of the image */
    height: 0;
    width: 100%;
}
.element-to-stretch {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("http://placehold.it/350x150/000/fff");
    background-size: cover;
}
.element-to-stretch:hover {
    background-image: url("http://placehold.it/350x150/ccc/fff");
}

这是一些关于背景大小的文档。其次，宽高比可能很棘手：如果比例为2：1（因此图像的宽度是它的两倍），那么 padding-bottom on .wrapper-with-intrinsic-ratio 将 50％。使用（高度÷宽度）×100进行处理。例如，您的350×150px图像将是 padding-bottom：42.857％; 和 150x350px它是233.333％。

Here's some documentation on background-size. Secondly, the aspect ratio can be tricky: If the ratio is 2:1 (so the image is twice as wide as it is tall) then the padding-bottom on .wrapper-with-intrinsic-ratio would be 50%. Work it out with (height ÷ width) × 100. So for example your 350×150px image would be padding-bottom: 42.857%; and for a 150x350px it'd be 233.333%.

或者，您可以使用两个img元素。 Clunky，但是......

Alternatively, you could do it with two img elements. Clunky, but...

<div>
    <img src="normal.jpg" alt="" class="normal"><img src="hover.jpg" alt="" class="hover">
</div>

div img { max-width: 100%; height: auto; }
div img.normal,
div:hover img.hover { display: block; }
div img.hover,
div:hover img.normal { display: none; }

或者你可以使用javascript。

Or you could use javascript.

这篇关于Bootstrap 3 mouseover图像响应的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！