HTML tutorial: How to use Flexbox for spacing-free layout

HTML Tutorial: How to use Flexbox for spacing-free layout

In web development, achieving flexible and spacing-free layout has always been an important technical problem. Traditional layout methods usually require the use of a large number of techniques such as center alignment, floating, and clearing floats. However, these methods are often too complex and difficult to achieve responsive layout. Fortunately, CSS3 introduced the Flexbox (flexible box layout) model. This new layout model can simply and elegantly implement various layout needs, and is very flexible. This article will introduce how to use Flexbox for spacing-free layout and give specific code examples.

1. Basic Concepts of Flexbox

Before we officially start using Flexbox, we need to understand some basic concepts.

1. Flex container (Flex Container): Elements that set the display attribute to flex or inline-flex are called Flex containers. The child elements of the Flex container will be laid out according to certain rules.
2. Flex Item: Each sub-element within the Flex container is called a Flex item. Flex items will be arranged and laid out based on the properties of the Flex container.
3. Main Axis and Cross Axis: The Flex container has a main axis and a cross axis by default. The main axis is the arrangement direction of Flex projects, and the cross axis is perpendicular to the main axis.
4. Spindle start point (Main Start) and spindle end point (Main End): The main axis start point is the starting position of the Flex project on the main axis, and the main axis end point is the end position of the Flex project on the main axis.
5. Cross Start and Cross End: The cross axis start point is the starting position of the Flex project on the cross axis, and the cross axis end point is the end position of the Flex project on the cross axis. .

2. Flexbox to implement spacing-free layout

It is very simple to use Flexbox to implement spacing-free layout. It only requires a few simple steps:

1. Create a Flex container

First, create a div element in the HTML file as a Flex container:

<div class="container">
  <!-- 这里是Flex项目 -->
</div>

2. Set the style of the Flex container

Then, in the CSS file, set the display attribute to flex for the Flex container, and set the layout and alignment of the main axis direction and cross axis direction as needed. For example, set the main axis to the horizontal direction, the cross axis to the vertical direction, and adopt a center-aligned layout:

.container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}

3. Add Flex project

Next, in the Flex container Add Flex items in the container, and these items will be arranged according to the layout set by the container. For example, add two Flex items:

<div class="container">
  <div class="item">Flex项目1</div>
  <div class="item">Flex项目2</div>
</div>

4. Set the style of the Flex item

Finally, in the CSS file, set the style for the Flex item, you can set the width of the item , height, margin, background color, etc. It should be noted that to set the spacing of an item, you only need to set the margin attribute of the item to 0:

.item {
  margin: 0;
  /* 其他样式设置 */
}

At this point, we have successfully implemented a spacing-free layout. With a few simple steps, we can use Flexbox models to easily achieve various layout effects.

3. Flexbox code example

A complete example is given below to demonstrate how to use Flexbox for spacing-free layout:

<style>
.container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}

.item {
  margin: 0;
  padding: 20px;
  background-color: #f0f0f0;
}
</style>



<div class="container">
  <div class="item">Flex项目1</div>
  <div class="item">Flex项目2</div>
</div>

The Flex container in the above code example is set The main axis in the horizontal direction and the cross axis in the vertical direction adopt a center-aligned layout. The Flex project sets styles such as margins and background colors, but the spacing between items is eliminated by setting margin to 0.

Summary

The Flexbox model provides us with a simple, flexible and powerful layout method. By appropriately setting the properties of the Flex container and Flex project, we can easily achieve various layout needs . Through the introduction of this article, I believe you have understood how to use Flexbox for spacing-free layout, and I hope it will be helpful to your web development work.

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