CSS Flexbox responzivní

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Responzivní Flexbox

Z kapitoly Dotazy na média CSS jste se dozvěděli, že pomocí dotazů na média můžete vytvářet různá rozvržení pro různé velikosti obrazovky a zařízení.

Laptop and Desktops:

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Mobile phones and Tablets:

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2
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Chcete-li například vytvořit rozvržení se dvěma sloupci pro většinu velikostí obrazovky a jednosloupcové rozvržení pro malé velikosti obrazovek (jako jsou telefony a tablety), můžete změnit flex-direction z řádku na sloupec v konkrétním bodě přerušení (800px v příkladu níže):

Příklad

 .flex-container {
  display: flex;
  flex-direction: row;
}
  
/* Responsive layout - makes a one column layout instead of a two-column 
  layout */
@media (max-width: 800px) {
  .flex-container {
    
  flex-direction: column;
  }
}

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<!DOCTYPE html>
<html>
<head>
<style>
* {
  box-sizing: border-box;
}

.flex-container {
  display: flex;
  flex-direction: row;
  font-size: 30px;
  text-align: center;
}

.flex-item-left {
  background-color: #f1f1f1;
  padding: 10px;
  flex: 50%;
}

.flex-item-right {
  background-color: dodgerblue;
  padding: 10px;
  flex: 50%;
}

/* Responsive layout - makes a one column-layout instead of two-column layout */
@media (max-width: 800px) {
  .flex-container {
    flex-direction: column;
  }
}
</style>
</head>
<body>

<h1>Responsive Flexbox</h1>

<p>The "flex-direction: row;" stacks the flex items horizontally (from left to right).</p>
<p>The "flex-direction: column;" stacks the flex items vertically (from top to bottom).</p>
<p><b>Resize the browser window to see that the direction changes when the 
screen size is 800px wide or smaller.</b></p>

<div class="flex-container">
  <div class="flex-item-left">1</div>
  <div class="flex-item-right">2</div>
</div>

</body>
</html>

Dalším způsobem je změnit procento vlastnosti flex u položek flex k vytvoření různých rozvržení pro různé velikosti obrazovky. Všimněte si, že my v tomto příkladu také musíte na kontejneru Flex zahrnout flex-wrap: wrap; práce:

Příklad

 .flex-container {
  display: flex;
  flex-wrap: wrap;
}
  
.flex-item-left {
  flex: 50%;
}
.flex-item-right {
  
  flex: 50%;
}
  
/* Responsive layout - makes a one column layout instead of a two-column 
  layout */
@media (max-width: 800px) {
  .flex-item-right, 
  .flex-item-left {
    flex: 100%;
  }
}

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<!DOCTYPE html>
<html>
<head>
<style>
* {
  box-sizing: border-box;
}

.flex-container {
  display: flex;
  flex-wrap: wrap;
  font-size: 30px;
  text-align: center;
}

.flex-item-left {
  background-color: #f1f1f1;
  padding: 10px;
  flex: 50%;
}

.flex-item-right {
  background-color: dodgerblue;
  padding: 10px;
  flex: 50%;
}

/* Responsive layout - makes a one column-layout instead of a two-column layout */
@media (max-width: 800px) {
  .flex-item-right, .flex-item-left {
    flex: 100%;
  }
}
</style>
</head>
<body>

<h1>Responsive Flexbox</h1>

<p>In this example, we change the percentage of flex to create different layouts for different screen sizes.</p>
<p><b>Resize the browser window to see that the direction changes when the 
screen size is 800px wide or smaller.</b></p>

<div class="flex-container">
  <div class="flex-item-left">1</div>
  <div class="flex-item-right">2</div>
</div>

</body>
</html>

Responzivní galerie obrázků pomocí Flexbox

Použijte flexbox k vytvoření responzivní galerie obrázků, která se liší mezi čtyřmi, dvěma nebo obrázky v plné šířce v závislosti na velikosti obrazovky:

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<!DOCTYPE html>
<html>
<style>
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial;
}

.header {
  text-align: center;
  padding: 32px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  padding: 0 4px;
}

/* Create four equal columns that sits next to each other */
.column {
  flex: 25%;
  max-width: 25%;
  padding: 0 4px;
}

.column img {
  margin-top: 8px;
  vertical-align: middle;
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media (max-width: 800px) {
  .column {
    flex: 50%;
    max-width: 50%;
  }
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media (max-width: 600px) {
  .column {
    flex: 100%;
    max-width: 100%;
  }
}
</style>
<body>

<!-- Header -->
<div class="header">
  <h1>Responsive Image Gallery</h1>
  <p>Resize the browser window to see the responsive effect.</p>
</div>

<!-- Photo Grid -->
<div class="row"> 
  <div class="column">
    <img src="/w3images/wedding.jpg" style="width:100%">
    <img src="/w3images/rocks.jpg" style="width:100%">
    <img src="/w3images/falls2.jpg" style="width:100%">
    <img src="/w3images/paris.jpg" style="width:100%">
    <img src="/w3images/nature.jpg" style="width:100%">
    <img src="/w3images/mist.jpg" style="width:100%">
    <img src="/w3images/paris.jpg" style="width:100%">
  </div>
  
  <div class="column">
    <img src="/w3images/underwater.jpg" style="width:100%">
    <img src="/w3images/ocean.jpg" style="width:100%">
    <img src="/w3images/wedding.jpg" style="width:100%">
    <img src="/w3images/mountainskies.jpg" style="width:100%">
    <img src="/w3images/rocks.jpg" style="width:100%">
    <img src="/w3images/underwater.jpg" style="width:100%">
  </div> 
   
  <div class="column">
    <img src="/w3images/wedding.jpg" style="width:100%">
    <img src="/w3images/rocks.jpg" style="width:100%">
    <img src="/w3images/falls2.jpg" style="width:100%">
    <img src="/w3images/paris.jpg" style="width:100%">
    <img src="/w3images/nature.jpg" style="width:100%">
    <img src="/w3images/mist.jpg" style="width:100%">
    <img src="/w3images/paris.jpg" style="width:100%">
  </div>
  
  <div class="column">
    <img src="/w3images/underwater.jpg" style="width:100%">
    <img src="/w3images/ocean.jpg" style="width:100%">
    <img src="/w3images/wedding.jpg" style="width:100%">
    <img src="/w3images/mountainskies.jpg" style="width:100%">
    <img src="/w3images/rocks.jpg" style="width:100%">
    <img src="/w3images/underwater.jpg" style="width:100%">
  </div>
</div>

</body>
</html>

Responzivní web využívající Flexbox

Použijte flexbox k vytvoření responzivního webu, který obsahuje flexibilní navigační panel a flexibilní obsah:

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<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {
  box-sizing: border-box;
}

/* Style the body */
body {
  font-family: Arial;
  margin: 0;
}

/* Header/logo Title */
.header {
  padding: 60px;
  text-align: center;
  background: #1abc9c;
  color: white;
}

/* Style the top navigation bar */
.navbar {
  display: flex;
  background-color: #333;
}

/* Style the navigation bar links */
.navbar a {
  color: white;
  padding: 14px 20px;
  text-decoration: none;
  text-align: center;
}

/* Change color on hover */
.navbar a:hover {
  background-color: #ddd;
  color: black;
}

/* Column container */
.row {  
  display: flex;
  flex-wrap: wrap;
}

/* Create two unequal columns that sits next to each other */
/* Sidebar/left column */
.side {
  flex: 30%;
  background-color: #f1f1f1;
  padding: 20px;
}

/* Main column */
.main {
  flex: 70%;
  background-color: white;
  padding: 20px;
}

/* Fake image, just for this example */
.fakeimg {
  background-color: #aaa;
  width: 100%;
  padding: 20px;
}

/* Footer */
.footer {
  padding: 20px;
  text-align: center;
  background: #ddd;
}

/* Responsive layout - when the screen is less than 700px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 700px) {
  .row, .navbar {   
    flex-direction: column;
  }
}
</style>
</head>
<body>

<!-- Note -->
<div style="background:yellow;padding:5px">
  <h4 style="text-align:center">Resize the browser window to see the responsive effect.</h4>
</div>

<!-- Header -->
<div class="header">
  <h1>My Website</h1>
  <p>With a <b>flexible</b> layout.</p>
</div>

<!-- Navigation Bar -->
<div class="navbar">
  <a href="#">Link</a>
  <a href="#">Link</a>
  <a href="#">Link</a>
  <a href="#">Link</a>
</div>

<!-- The flexible grid (content) -->
<div class="row">
  <div class="side">
    <h2>About Me</h2>
    <h5>Photo of me:</h5>
    <div class="fakeimg" style="height:200px;">Image</div>
    <p>Some text about me in culpa qui officia deserunt mollit anim..</p>
    <h3>More Text</h3>
    <p>Lorem ipsum dolor sit ame.</p>
    <div class="fakeimg" style="height:60px;">Image</div><br>
    <div class="fakeimg" style="height:60px;">Image</div><br>
    <div class="fakeimg" style="height:60px;">Image</div>
  </div>
  <div class="main">
    <h2>TITLE HEADING</h2>
    <h5>Title description, Dec 7, 2017</h5>
    <div class="fakeimg" style="height:200px;">Image</div>
    <p>Some text..</p>
    <p>Sunt in culpa qui officia deserunt mollit anim id est laborum consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco.</p>
    <br>
    <h2>TITLE HEADING</h2>
    <h5>Title description, Sep 2, 2017</h5>
    <div class="fakeimg" style="height:200px;">Image</div>
    <p>Some text..</p>
    <p>Sunt in culpa qui officia deserunt mollit anim id est laborum consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco.</p>
  </div>
</div>

<!-- Footer -->
<div class="footer">
  <h2>Footer</h2>
</div>

</body>
</html>