HTML tutorial: How to use Flexbox for scalable, equal-height, equal-width, equal-spacing adaptive layout-HTML Tutorial-php.cn

HTML tutorial: How to use Flexbox for scalable, equal-height, equal-width, equal-spacing adaptive layout

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Release： 2023-10-19 10:22:46

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HTML tutorial: How to use Flexbox for scalable, equal-height, equal-width, equal-spacing adaptive layout

HTML tutorial: How to use Flexbox for scalable adaptive layout of equal height, equal width and equal spacing. Specific code examples are required.

1. What is Flexbox layout
Flexbox It is a new layout mode introduced in CSS3 that can achieve flexible box model layout. It is the abbreviation of Flexible Box, which means flexible layout. Flexbox layout can automatically adjust the position and size of elements according to the size of the container to achieve various flexible arrangements.

2. How to use Flexbox layout

Create a layout container
First, you need to create a container containing the elements to be laid out. In HTML, you can use a div element as a container. In order to set the container to Flexbox layout, you need to add the following code to the style attribute of the container:

<div style="display: flex;"></div>

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Set the layout direction of the element
In the container, you need to specify the layout of the element The direction can be horizontal or vertical. By default, elements are arranged horizontally. If you need to arrange vertically, you can add the following code in the style attribute of the container:

<div style="display: flex; flex-direction: column;"></div>

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Set the scaling ratio of the element
The elements in the Flexbox layout can be adjusted according to the set Scale to allocate remaining space. By default, the element's scaling ratio is 0, which means no scaling is performed. You can add the following code to the style attribute of the element to set the scaling ratio of the element:

<div style="display: flex;">
  <div style="flex: 1;"></div>
  <div style="flex: 2;"></div>
</div>

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In this example, the scaling ratio of the first div element is 1, and the scaling ratio of the second div element is 1. The ratio is 2. That is, the first element occupies 1/3 of the space, and the second element occupies 2/3 of the space.

Set equal height and equal width
Flexbox layout can easily achieve equal height and equal width layout. Add the following code to the style attribute of the element to achieve the effect of equal height and equal width:

<div style="display: flex;">
  <div style="flex: 1;"></div>
  <div style="flex: 1;"></div>
  <div style="flex: 1;"></div>
</div>

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In this example, the scaling ratio of the three div elements is 1, and they will divide the container equally. space, achieving the effect of equal height and equal width.

Set spacing
In Flexbox layout, you can set the spacing of elements through the justify-content and align-items properties. The justify-content property is used to set the spacing in the horizontal direction, and the align-items property is used to set the spacing in the vertical direction. The values that can be set for these two properties are: flex-start, flex-end, center, space-between and space-around.

<div style="display: flex; justify-content: space-between; align-items: center;">
  <div></div>
  <div></div>
</div>

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In this example, the spacing between the two div elements is evenly distributed, and the specific size of the spacing is determined by the space of the container.

3. Browser compatibility of Flexbox layout
Flexbox layout has good compatibility in modern browsers, but there may be compatibility issues in some older browsers. These problems can be solved by adding some browser prefixes such as -webkit-, -moz-, -ms-, etc.

4. Sample code

<!DOCTYPE html>
<html>
<head>
  <style>
    .container {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      align-items: center;
      height: 500px;
      background-color: #f2f2f2;
      padding: 20px;
      box-sizing: border-box;
    }
    
    .item {
      flex: 1;
      width: 100%;
      background-color: #fff;
      border: 1px solid #ccc;
      margin-bottom: 10px;
    }
  </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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The above code implements an example of Flexbox layout. There are three child elements with equal height and equal spacing in the container. The height of the container is a fixed value and is displayed vertically in the center of the container.

Summary:
Using Flexbox layout can easily achieve scalable, equal height, equal width, and equal spacing adaptive layout. By setting the attribute values of containers and elements, it is easy to achieve various flexible arrangements. At the same time, it should be noted that Flexbox layout may have compatibility issues in some older browsers, which can be solved by adding a browser prefix. I hope this article can help you use Flexbox layout in HTML development.

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