BACKGROUNG
The Flexbox Layout
(Flexible Box) module (currently a W3C Last Call Working Draft) aims at providing a more efficient way to lay out, align and distribute space among items in a container, even when their size is unknown and/or dynamic (thus the word “flex”).
The main idea behind the flex layout is to give the container the ability to alter its items’ width/height (and order) to best fill the available space (mostly to accommodate to all kind of display devices and screen sizes). A flex container expands items to fill available free space, or shrinks them to prevent overflow.
Most importantly, the flexbox layout is direction-agnostic as opposed to the regular layouts (block which is vertically-based and inline which is horizontally-based). While those work well for pages, they lack flexibility (no pun intended) to support large or complex applications (especially when it comes to orientation changing, resizing, stretching, shrinking, etc.).
Note: Flexbox layout is most appropriate to the components of an application, and small-scale layouts, while the Grid layout is intended for larger scale layouts.
Basics & Terminology
Since flexbox is a whole module and not a single property, it involves a lot of things including its whole set of properties. Some of them are meant to be set on the container (parent element, known as “flex container”) whereas the others are meant to be set on the children (said “flex items”).
If regular layout is based on both block and inline flow directions, the flex layout is based on “flex-flow directions”. Please have a look at this figure from the specification, explaining the main idea behind the flex layout.
Basically, items will be laid out following either the main axis
(from main-start
to main-end
) or the cross axis (from cross-start
to cross-end
).
- main axis – The main axis of a flex container is the primary axis along which flex items are laid out. Beware, it is not necessarily horizontal; it depends on the
flex-direction
property (see below). - main-start | main-end – The flex items are placed within the container starting from main-start and going to main-end.
- main size – A flex item’s width or height, whichever is in the main dimension, is the item’s main size. The flex item’s main size property is either the ‘width’ or ‘height’ property, whichever is in the main dimension.
- cross axis – The axis perpendicular to the main axis is called the cross axis. Its direction depends on the main axis direction.
- cross-start | cross-end – Flex lines are filled with items and placed into the container starting on the cross-start side of the flex container and going toward the cross-end side.
- cross size – The width or height of a flex item, whichever is in the cross dimension, is the item’s cross size. The cross size property is whichever of ‘width’ or ‘height’ that is in the cross dimension.
Properties for the Parent
(flex container)
#display
This defines a flex container; inline or block depending on the given value. It enables a flex context for all its direct children.
.container {
display: flex; /* or inline-flex */
}
Note that CSS columns have no effect on a flex container.
#flex-direction
This establishes the main-axis, thus defining the direction flex items are placed in the flex container. Flexbox is (aside from optional wrapping) a single-direction layout concept. Think of flex items as primarily laying out either in horizontal rows or vertical columns.
.container {
flex-direction: row | row-reverse | column | column-reverse;
}
row
(default): left to right inltr
; right to left inrtl
row-reverse
: right to left inltr
; left to right inrtl
column
: same asrow
but top to bottomcolumn-reverse
: same asrow-reverse
but bottom to top
#flex-wrap
By default, flex items will all try to fit onto one line. You can change that and allow the items to wrap as needed with this property.
.container{
flex-wrap: nowrap | wrap | wrap-reverse;
}
nowrap
(default): all flex items will be on one linewrap
: flex items will wrap onto multiple lines, from top to bottom.wrap-reverse
: flex items will wrap onto multiple lines from bottom to top.
#flex-flow (Applies to: parent flex container element)
This is a shorthand flex-direction
and flex-wrap
properties, which together define the flex container’s main and cross axes. Default is row nowrap
.
flex-flow: <‘flex-direction’> || <‘flex-wrap’>
#justify-content
This defines the alignment along the main axis. It helps distribute extra free space left over when either all the flex items on a line are inflexible, or are flexible but have reached their maximum size. It also exerts some control over the alignment of items when they overflow the line.
.container {
justify-content: flex-start | flex-end | center | space-between | space-around | space-evenly;
}
flex-start
(default): items are packed toward the start lineflex-end
: items are packed toward to end linecenter
: items are centered along the linespace-between
: items are evenly distributed in the line; first item is on the start line, last item on the end linespace-around
: items are evenly distributed in the line with equal space around them. Note that visually the spaces aren’t equal, since all the items have equal space on both sides. The first item will have one unit of space against the container edge, but two units of space between the next item because that next item has its own spacing that applies.space-evenly
: items are distributed so that the spacing between any two items (and the space to the edges) is equal.
#align-items
This defines the default behaviour for how flex items are laid out along the cross axis on the current line. Think of it as the justify-content
version for the cross-axis (perpendicular to the main-axis).
.container {
align-items: flex-start | flex-end | center | baseline | stretch;
}
flex-start
: cross-start margin edge of the items is placed on the cross-start lineflex-end
: cross-end margin edge of the items is placed on the cross-end linecenter
: items are centered in the cross-axisbaseline
: items are aligned such as their baselines alignstretch
(default): stretch to fill the container (still respect min-width/max-width)
#align-content
This aligns a flex container’s lines within when there is extra space in the cross-axis, similar to how justify-content
aligns individual items within the main-axis.
Note: this property has no effect when there is only one line of flex items.
.container {
align-content: flex-start | flex-end | center | space-between | space-around | stretch;
}
flex-start
: lines packed to the start of the containerflex-end
: lines packed to the end of the containercenter
: lines packed to the center of the containerspace-between
: lines evenly distributed; the first line is at the start of the container while the last one is at the endspace-around
: lines evenly distributed with equal space around each linestretch
(default): lines stretch to take up the remaining space
- Tech Tricks answered 10 months ago
- last edited 10 months ago
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