Keep the middle item centered when side items have different widths(当侧项具有不同宽度时,保持中间项居中)
问题描述
Imagine the following layout, where the dots represent the space between the boxes:
[Left box]......[Center box]......[Right box]
When I remove the right box, I like the center box to still be in the center, like so:
[Left box]......[Center box].................
The same goes for if I would remove the left box.
................[Center box].................
Now when the content within the center box gets longer, it will take up as much available space as needed while remaining centered. The left and right box will never shrink and thus when where is no space left the overflow:hidden
and text-overflow: ellipsis
will come in effect to break the content;
[Left box][Center boxxxxxxxxxxxxx][Right box]
All the above is my ideal situation, but I have no idea how to accomplish this effect. Because when I create a flex structure like so:
.parent {
display : flex; // flex box
justify-content : space-between; // horizontal alignment
align-content : center; // vertical alignment
}
If the left and right box would be exactly the same size, I get the desired effect. However when one of the two is from a different size the centered box is not truly centered anymore.
Is there anyone that can help me?
Update
A justify-self
would be nice, this would be ideal:
.leftBox {
justify-self : flex-start;
}
.rightBox {
justify-self : flex-end;
}
If the left and right boxes would be exactly the same size, I get the desired effect. However when one of the two is a different size the centered box is not truly centered anymore. Is there anyone that can help me?
Here's a method using flexbox to center the middle item, regardless of the width of siblings.
Key features:
- pure CSS
- no absolute positioning
- no JS/jQuery
Use nested flex containers and auto
margins:
.container {
display: flex;
}
.box {
flex: 1;
display: flex;
justify-content: center;
}
.box:first-child > span { margin-right: auto; }
.box:last-child > span { margin-left: auto; }
/* non-essential */
.box {
align-items: center;
border: 1px solid #ccc;
background-color: lightgreen;
height: 40px;
}
p {
text-align: center;
margin: 5px 0 0 0;
}
<div class="container">
<div class="box"><span>short text</span></div>
<div class="box"><span>centered text</span></div>
<div class="box"><span>loooooooooooooooong text</span></div>
</div>
<p>↑<br>true center</p>
Here's how it works:
- The top-level div (
.container
) is a flex container. - Each child div (
.box
) is now a flex item. - Each
.box
item is givenflex: 1
in order to distribute container space equally (more details). - Now the items are consuming all space in the row and are equal width.
- Make each item a (nested) flex container and add
justify-content: center
. - Now each
span
element is a centered flex item. - Use flex
auto
margins to shift the outerspan
s left and right.
You could also forgo justify-content
and use auto
margins exclusively.
But justify-content
can work here because auto
margins always have priority.
8.1. Aligning with
auto
marginsPrior to alignment via
justify-content
andalign-self
, any positive free space is distributed to auto margins in that dimension.
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