Layout CSS - Esempi di float
Questa pagina contiene esempi di float comuni.
Griglia di riquadri / Riquadri di uguale larghezza
Riquadro 1
Riquadro 2
Riquadro 1
Riquadro 2
Riquadro 3
Con la floatproprietà, è facile far galleggiare scatole di contenuto fianco a fianco:
Esempio
* {
box-sizing: border-box;
}
.box {
float: left;
width: 33.33%; /* three
boxes (use 25% for four, and 50% for two, etc) */
padding:
50px; /* if you want space between the images */
}
Che cos'è il dimensionamento della scatola?
Puoi facilmente creare tre scatole galleggianti affiancate. Tuttavia, quando aggiungi qualcosa che ingrandisce la larghezza di ogni riquadro (ad es. riempimento o bordi), il riquadro si rompe. La box-sizingproprietà ci consente di includere l'imbottitura e il bordo nella larghezza (e altezza) totale della scatola, assicurandoci che l'imbottitura rimanga all'interno della scatola e che non si rompa.
Puoi leggere di più sulla proprietà box-sizing nel nostro capitolo CSS Box Sizing .
Immagini affiancate
La griglia di riquadri può essere utilizzata anche per visualizzare le immagini affiancate:
Esempio
.img-container {
float: left;
width: 33.33%; /* three
containers (use 25% for four, and 50% for two, etc) */
padding:
5px; /* if you want space between the images */
}
Scatole di uguale altezza
In the previous example, you learned how to float boxes side by side with an equal width. However, it is not easy to create floating boxes with equal heights. A quick fix however, is to set a fixed height, like in the example below:
Box 1
Some content, some content, some content
Box 2
Some content, some content, some content
Some content, some content, some content
Some content, some content, some content
Example
.box {
height: 500px;
}
However, this is not very flexible. It is ok if you can guarantee that the boxes will always have the same amount of content in them. But many times, the content is not the same. If you try the example above on a mobile phone, you will see that the second box's content will be displayed outside of the box. This is where CSS3 Flexbox comes in handy - as it can automatically stretch boxes to be as long as the longest box:
Example
Using Flexbox to create flexible boxes:
Tip: You can read more about the Flexbox Layout Module in our CSS Flexbox Chapter.
Navigation Menu
You can also use float with a list of hyperlinks to create a horizontal menu:
Example
Web Layout Example
It is also common to do entire web layouts using the float property:
Example
.header, .footer {
background-color: grey;
color: white;
padding: 15px;
}
.column {
float: left;
padding: 15px;
}
.clearfix::after {
content:
"";
clear: both;
display: table;
}
.menu {
width: 25%;
}
.content {
width: 75%;
}
More Examples
Let an image float to the right in a paragraph. Add border and margins to the image.
Let an image with a caption float to the right.
Let the first letter of a paragraph float to the left and style the letter.
Use float to create a homepage with a navbar, header, footer, left content and main content.
All CSS Float Properties
| Property | Description |
|---|---|
| box-sizing | Defines how the width and height of an element are calculated: should they include padding and borders, or not |
| clear | Specifies what should happen with the element that is next to a floating element |
| float | Specifies whether an element should float to the left, right, or not at all |
| overflow | Specifies what happens if content overflows an element's box |
| overflow-x | Specifies what to do with the left/right edges of the content if it overflows the element's content area |
| overflow-y | Specifies what to do with the top/bottom edges of the content if it overflows the element's content area |