Flexbox Layout Module

Ovidiu Olea 

Agenda:

  • What is FlexBox?
  • Flexbox Properties
  • Demo
  • Q & A 
  • Flexbox concepts

What is flexbox?

Flexbox module is a new method in CSS3 that allows you to create complex responsive web layouts.

Flexbox concepts

  • was designed as a one-dimensional layout model (either as a row or as a column)
  • main axis & cross axis
  • flex container 

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 ​

Flexbox concepts

Main axis & Cross axis

When working with flexbox you need to think in terms of two axes, the main axis and the cross axis.

The main axis is defined by the flex-direction property, and the cross axis runs perpendicular to it.

Flexbox concepts

Main axis & Cross axis

The main axis is defined by flex-direction, which has four possible values:

  • row
  • row-reverse
  • column
  • column-reverse

Flexbox concepts

Main axis & Cross axis

  • row or row-reverse,  main axis will run along the row in the inline direction.

Flexbox concepts

Main axis & Cross axis

  • column or column-reverse , main axis will run from the top of the page to the bottom , in the block direction.

Flexbox concepts

 Cross axis

  • cross axis runs perpendicular to the main axis, if  flex-direction (main axis) is set to row or row-reverse the cross axis runs down the columns.

Flexbox concepts

 Cross axis

If your main axis is column or column-reverse then the cross axis runs along the rows.

Main axis & Cross axis

Flexbox concepts

Flexbox properties

Parent Properties

Children Properties

  • flex-direction
  • flex-wrap
  • justify-content
  • order
  • flex-grow
  • flex-shrink
  • flex-basis
  • align-items
  • flex (shorthand property)
  • flex-flow (shorthand property)
  • align-self

Parent property

flex-direction property, defines the direction items are placed in the container, and accepts the following values:

  • row: Items are placed the same as the text direction.
  • row-reverse: Items are placed opposite to the text direction.
  • column: Items are placed top to bottom.
  • column-reverse: Items are placed bottom to top
.flex-container {
    display: flex;
    flex-direction: row | column;
    background-color: blue; 
}

.flex-container > div { 
    background-color:#f1f1f1;
    width: 100px;
    margin:10px;
    text-align: center;
    line-height: 75px;
    font-size: 30px;
}

row

row-reverse

column

column-reverse

Parent property

flex-wrap  property, specifies whether the flex items should wrap or not and accepts the following values:

  • nowrap: Every item is fit to a single line.
  • wrap: Items wrap around to additional lines.
  • wrap-reverse: Items wrap around to additional lines in reverse.
.flex-container {
    display: flex; 
    flex-wrap: wrap;
    background-color: blue;
}

.flex-container > div { 
    background-color:#f1f1f1;
    width: 100px;
    margin:10px;
    text-align: center;
    line-height: 75px;
    font-size: 30px;
}

wrap

nowrap

wrap-reverse

Parent property

flex-flow  property is a shorthand property for setting both the flex-direction and flex-wrap properties.

.flex-container {
    flex-flow: flex-direction flex-wrap;
}
.flex-container {
  display: flex;
  flex-flow: row wrap;
  background-color: Blue;
}

.flex-container > div {
  background-color: #f1f1f1;
  width: 100px;
  margin: 10px;
  text-align: center;
  line-height: 75px;
  font-size: 30px;
}

Parent property

justify-content property, let you align items horizontally and accepts the following values:

  • flex-start: Items align to the left side of the container.
  • flex-end: Items align to the right side of the container.
  • center: Items align at the center of the container.
  • space-between: Items display with equal spacing between them.
  • space-around: Items display with equal spacing around them.

<div class="flex-container">
      <div>1</div>
      <div>2</div>       
      <div>3</div>                          
 </div>



.flex-container {
    display: flex;
    background-color: blue; 
    justify-content: center;
}

.flex-container > div { 
    background-color:#f1f1f1;
    margin:10px;
    padding:20px;
    font-size:30px;
}

center

flex-end

flex-start

space-around

space-between

Parent property

align-items property, let you align items vertically and accepts the following values:

  • flex-start: Items align to the top of the container.
  • center: Items align at the vertical center of the container.
  • flex-end: Items align to the bottom of the container.
  • stretch: Items are stretched to fit the container.
.flex-container {
    display: flex;
    background-color: dodgerblue; 
    align-items:center;
}

.flex-container > div { 
    background-color:#f1f1f1;
    margin:10px;
    padding:20px;
    font-size:30px;
}

center

flex-start

flex-end

stretch

Children property

order  property specifies the order of the flex items.


.item {
    order: <number>;
}
<div class="flex-container">
        <div style="order: 3">1</div>
        <div style="order: 2">2</div>       
        <div style="order: 4">3</div>
        <div style="order: 1">4</div>                                                                                   
 </div>

order

Children property

flex-grow  property specifies how much a flex item will grow relative to the rest of the flex items.


.item {
  flex-grow: <number>; 
}
<div class="flex-container">
        <div>7</div>
        <div>6</div>
        <div style="flex-grow:2">8</div>
 </div>

Children property

flex-shrink property specifies how much a flex item will shrink relative to the rest of the flex items.


.item {
  flex-shrink: <number>; 
}
<div class="flex-container">
            <div>1</div>
            <div>2</div>
            <div style="flex-shrink:2">3</div>
            <div>4</div>
            <div>5</div>
            <div>6</div>
            <div>7</div>
            <div>8</div>
            <div>9</div>
            <div>10</div>
  </div>

Children property

flex-basis property specifies the initial length of a flex item.


.item {
  flex-basis: <number>; 
}
 <div class="flex-container">
        <div>1</div>
        <div>2</div>
        <div style="flex-basis: 400px">3</div>
        <div>4</div>
  </div>

Children property

flex  property is a shorthand property for the flex-grow, flex-shrink, and flex-basis properties.


.item {
  flex: flex-grow  flex-shrink  flex-basis; 
}
<div class="flex-container">
        <div>1</div>
        <div>2</div>
        <div style="flex: 0 0 200px">3</div>
        <div>4</div>
</div>

Third flex item not growable (0), not shrinkable (0), and with an initial length of 200 pixels:

Children property

align-self property specifies the alignment for the selected item inside the flexible container.

<div class="flex-container">
        <div>1</div>
        <div>2</div>
        <div style="align-self: center">3</div>
        <div>4</div>
</div>

DEMO

Q&A

Thank You!

Flexbox

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Flexbox

Flexbox Layout Module

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