why transition doesn't work on absolutely positioned image? - html

Question

I have an absolutely positioned image inside a relatively positioned container.
Height of image is bigger than that of the container.
I want the image to scroll up to its end using only CSS.
The catch is that height of the image could vary, so it makes sense to make sure that bottom of the image is aligned with bottom of the container once hovered.
Following is the code:
.box {
position: relative;
display: block;
height: 200px;
width: 200px;
background-color: red;
overflow: hidden;
}
.box img {
position: absolute;
left: 0;
-webkit-transition: all 1s ease;
-moz-transition: all 1s ease;
-o-transition: all 1s ease;
-ms-transition: all 1s ease;
transition: all 1s ease;
}
img:hover {
bottom: 0;
}
<div class="box">
<img src="http://voxman.net/wp-content/uploads/2011/04/whiteonblack.jpg">
</div>

Answer 1

Try transition on transform
.box {
position: relative;
display: block;
height: 200px;
width: 200px;
background-color: red;
overflow: hidden;
}
.box img {
position: absolute;
left: 0;
top: 0;
transition: transform 1s ease;
}
img:hover {
transform: translateY(-60%);
}
<div class="box">
<img src="http://voxman.net/wp-content/uploads/2011/04/whiteonblack.jpg">
</div>
EDIT:
As the height is not set, I'd suggest a jQuery/js solution
$("img")
.mouseover(function() {
var offset = -$(this).height() + 200;
$(this).css("top", offset);
})
.mouseleave(function() {
$(this).css("top", 0);
});
body {
display: flex;
justify-content: space-around;
}
.box {
position: relative;
display: block;
height: 200px;
width: 200px;
background-color: red;
overflow: hidden;
}
.box img {
position: absolute;
left: 0;
top: 0;
transition: top 1s ease;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="box">
<img src="http://voxman.net/wp-content/uploads/2011/04/whiteonblack.jpg">
</div>
<div class="box">
<img src="https://upload.wikimedia.org/wikipedia/commons/0/0c/Vertical-Banner-EN.jpg">
</div>

Answer 2

You need a way to position the element equivalent to bottom: 0px, but taken for the reference the top .
If you set top: 100%, the top of the element will be at the bottom of the parent.
Then, set a transform of 100%, and the bottom will be where the top was.
Notice that this solution works for any image and container height.
.box {
position: relative;
display: block;
height: 200px;
width: 200px;
background-color: red;
overflow: hidden;
}
.box img {
position: absolute;
left: 0;
top: 0%;
transform: translateY(0%);
transition: all 1s ease;
}
img:hover {
top: 100%;
transform: translateY(-100%);
}
<div class="box">
<img src="http://voxman.net/wp-content/uploads/2011/04/whiteonblack.jpg">
</div>

Answer 3

You can have a transition between bottom: 0 and bottom: calc(100% - 18px), which is the height of the container minus the height of box2.
.box {
position: relative;
display: block;
height: 200px;
width: 200px;
background-color: red;
}
.box2 {
position: absolute;
height: 18px;
bottom: calc(100% - 18px);
-webkit-transition: all 1s ease;
-moz-transition: all 1s ease;
-o-transition: all 1s ease;
-ms-transition: all 1s ease;
transition: all 1s ease;
}
.box:hover .box2 {
background-color: green;
bottom: 0;
}
<div class="box">
<div class="box2">
test
</div>
</div>

Answer 4

You can use this, try this with working snippet,
.box{
position:relative;
display:block;
height:200px;
width:200px;
background-color:red;
transition: all 1s ease;
}
.box2{
position: absolute;
transition: all 1s ease;
}
.box:hover .box2{
background-color:green;
margin-top: 180px;
}
<div class="box">
<div class="box2">
test
</div>
</div>