HTML tutorial: How to use Flexbox for equal distribution

HTML tutorial: How to use Flexbox for equal distribution

In web development, achieving equal distribution is a very common requirement. The traditional approach may require a lot of CSS code and be difficult to maintain. Using Flexbox layout, we can achieve equal distribution through some simple attributes and values, which greatly simplifies the code writing and maintenance process.

This article will introduce the basic concepts and usage of Flexbox, and give specific code examples.

1. Introduction to Flexbox layout

Flexbox is a CSS layout module that can arrange and layout elements according to certain rules. Flexbox adopts the flexible box model, which allows elements to be freely expanded, aligned and distributed in the container. The advantage of Flexbox lies in its simple and easy-to-understand syntax and powerful layout capabilities.

2. Basic concepts of Flexbox layout

Before using Flexbox layout, we need to understand several basic concepts.

1. Container: Elements with Flexbox layout are called containers. All elements inside the container will be affected by Flexbox layout.

2. Item: The elements inside the container are called items. Items are the basic unit of Flexbox layout, they are placed on the main axis of the container.

3. Main Axis: The direction in which items are arranged in the container is called the main axis. By default, the main axis is horizontal.

4. Cross Axis: The direction perpendicular to the main axis is called the cross axis. By default, the cross axis is vertical.

3. Properties and values ​​of Flexbox layout

Flexbox layout provides a series of properties and values ​​for controlling the layout of containers and items.

1. Container properties

• display: Set the display mode of the container to flex or inline-flex.
• flex-direction: Set the direction of the main axis (row, row-reverse, column, column-reverse).
• flex-wrap: Set whether the item wraps (nowrap, wrap, wrap-reverse).
• justify-content: Set the alignment of the item on the main axis (flex-start, flex-end, center, space-between, space-around).
• align-items: Set the alignment of items on the cross axis (flex-start, flex-end, center, baseline, stretch).
• align-content: Set the alignment of multi-line items on the cross axis (flex-start, flex-end, center, space-between, space-around, stretch).

2. Project attributes

• order: Set the order of items.
• flex-grow: Set the magnification ratio of the item. The default is 0, which means no magnification.
• flex-shrink: Set the shrinkage ratio of the project. The default is 1, which can be reduced.
• flex-basis: Set the initial size of the item on the main axis.
• flex: Set the abbreviation properties of the project, including flex-grow, flex-shrink and flex-basis.
• align-self: Set the alignment of a single item on the cross axis.

4. Code example of using Flexbox for equal distribution

The following is a specific code example of using Flexbox for equal distribution, which implements a simple navigation bar layout.

HTML code:

<div class="navbar">
  <a href="#">Home</a>
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Contact</a>
</div>

CSS code:

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 50px;
  background-color: lightblue;
}

.navbar a {
  flex: 1;
  text-align: center;
  padding: 10px;
}

.navbar a:hover {
  background-color: lightgray;
}

In the above example, by setting the display of .navbar The property is flex, making it a container. The child element <a></a> of .navbar is the item. By setting the attribute of flex: 1, the equal distribution layout is achieved. At the same time, through the attributes of justify-content: space-between and align-items: center, the alignment and distribution of items on the main axis and cross axis are achieved.

Through this example, we can see that using Flexbox for equal distribution is very simple and only requires a few lines of CSS code to complete. At the same time, due to Flexbox’s powerful layout capabilities, more complex layout effects can be easily achieved.

Summary

This article introduces the basic concepts and usage of Flexbox layout, and gives a specific code example of equal distribution layout. I hope that through this article, readers can better understand and master the Flexbox layout and use it flexibly in actual projects.

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