HTML Tutorial: How to Use Flexbox for Vertical Average Layout-HTML Tutorial-php.cn

HTML Tutorial: How to Use Flexbox for Vertical Average Layout

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Release： 2023-10-24 13:15:41

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HTML Tutorial: How to Use Flexbox for Vertical Average Layout

Introduction:
In web design and development, layout is an important part that can be used on the page. Properly arranging the content on the page can not only improve the user experience, but also make the page look more beautiful and professional. In the past period of time, we have used float, position, and display attributes to implement different layout methods. However, these methods can cause problems in some cases, especially when dealing with vertical layouts. With the emergence of Flexbox (flexible box layout model), we can handle vertical layout more easily. This article will introduce how to use Flexbox to implement vertical average layout, and provide specific code examples to help readers better understand and apply.

What is Flexbox?
Flexbox is a CSS layout model designed to provide a more flexible way to lay out web pages. It can create a flexible box in a container so that the elements in it can be arranged and aligned according to certain rules. Flexbox consists of a container and the items in it. The container specifies how to lay out the items, and the items are the basic units that make up the layout. By defining the properties of the container to control the layout, we can more easily implement various complex layouts.
Vertical average layout
Vertical average layout is a layout method that evenly distributes elements in the container in the vertical direction. Traditionally, we need to resort to some tricks and calculations to achieve this layout. Using Flexbox, we can achieve vertical average layout more simply. The following are several key steps to achieve vertical average layout:

Step 1: Create a container that contains the elements that need to be vertically averaged layout.

<div class="container">
  <div class="item">Item 1</div>
  <div class="item">Item 2</div>
  <div class="item">Item 3</div>
</div>

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Step 2: Set the display attribute of the container to "flex" and determine the direction of the main axis and cross axis.

.container {
  display: flex;
  flex-direction: column;  /* 设置主轴方向为垂直方向 */
  justify-content: space-between;  /* 将项目在主轴方向上均匀分布 */
  align-items: flex-start;  /* 设置项目在交叉轴方向上左对齐 */
}

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Step 3: Set the required style for each element.

.item {
  width: 100%;  /* 设定元素的宽度为100%，使其填满容器 */
  height: 60px;  /* 设定元素的高度 */
  background-color: #ccc;  /* 设置元素的背景颜色 */
}

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Sample code and effect display
The following sample code will demonstrate how to use Flexbox to achieve vertical average layout:

<!DOCTYPE html>
<html>
  <head>
    <style>
      .container {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        align-items: flex-start;
        height: 400px;  /* 为容器设定高度以便观察效果 */
      }

      .item {
        width: 100%;
        height: 60px;
        background-color: #ccc;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="item">Item 1</div>
      <div class="item">Item 2</div>
      <div class="item">Item 3</div>
    </div>
  </body>
</html>

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Open the above code in the browser, that is You can see that the three Item elements are evenly distributed vertically in the container.

Conclusion:
Using Flexbox makes it easier to implement various layouts, including vertical average layouts. By setting the display, flex-direction, justify-content and align-items properties of the container and setting the style of the item, we can quickly achieve a vertically average layout effect. In actual development, we can adjust and optimize according to specific needs to make the layout of the page more flexible and beautiful.

Summary:
This article introduces how to use Flexbox to achieve vertical average layout. We understood the basic concepts and principles of Flexbox, and learned how to set the properties of the container and the style of the items to achieve a vertically average layout. I hope this article will be helpful to readers when using Flexbox to layout pages, and they can better master the methods and techniques of vertical average layout.

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