Detailed explanation of automatic spacing and filling effects in CSS Flex layout

Detailed explanation of automatic spacing and filling effects in Css Flex elastic layout

Introduction:
In modern web design, it is very important to implement responsive layout. The Flex layout of CSS is a powerful tool that can help us achieve flexible layout effects. This article will focus on the automatic spacing and filling effects in Flex layout. Through specific code examples, it will give you an in-depth understanding of how to flexibly use these features to achieve better web page layout effects.

1. Introduction to Flex Layout
Flex layout is a modern layout method in CSS, which allows us to easily implement flexible box layout. Specifically, Flex layout divides the container (that is, the parent element) into two directions: the main axis and the cross axis. By setting the properties of the container, you can control the arrangement of child elements to achieve different layout effects. Among them, the main attributes include flex-direction, justify-content, align-items, flex, etc.

2. Automatic spacing effect
In Flex layout, we can achieve automatic spacing effect between sub-elements by setting the justify-content attribute. The justify-content attribute defines the alignment of child elements in the main axis direction. There are several commonly used values:

1. flex-start: child elements are aligned to the left.
2. flex-end: child elements are aligned to the right.
3. center: child elements are centered.
4. space-between: Evenly distribute spacing between child elements.
5. space-around: Evenly distribute space around child elements.

Here is a sample code that shows how to use the justify-content attribute to achieve the automatic spacing effect:

<div class="container">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>

.container {
  display: flex;
  justify-content: space-between;
}

.item {
  width: 100px;
  height: 100px;
  background-color: red;
}

In the above code, we set the container to Flex layout and then pass Set justify-content: space-between; to evenly distribute spacing between child elements. You can adjust the width of the container and the width of the child elements yourself, and observe the arrangement of the child elements in the container.

3. Filling effect
In addition to the automatic spacing effect, Flex layout can also achieve the automatic filling effect of child elements. In Flex layout, we can control the size allocation ratio of child elements by setting the flex attribute. The flex property is an abbreviation for three values, which represent the values ​​of the three properties flex-grow, flex-shrink and flex-basis respectively. Among them, flex-basis defines the initial size of the child element, flex-grow defines the sufficiency of the child element when there is remaining space, and flex-shrink defines the degree of shrinkage of the child element when there is insufficient space.

The following is a sample code that shows how to use the flex property to achieve the fill effect:

<div class="container">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>

.container {
  display: flex;
}

.item {
  flex: 1;
  height: 100px;
  background-color: red;
}

In the above code, we set the container to Flex layout, and then set the flex property of .item is 1, so that the child elements are filled in equal proportions. You can adjust the width of the container and the number of sub-elements by yourself, and observe the size changes of the sub-elements.

Conclusion:
This article introduces in detail the automatic spacing and filling effects in Flex layout. By setting the justify-content attribute, we can achieve automatic spacing between child elements so that the child elements distribute space evenly in the main axis direction. By setting the flex attribute, we can achieve the automatic filling effect of sub-elements, so that the sub-elements can be resized according to proportion. I hope that through the explanation of this article, you will have a deeper understanding of the automatic spacing and filling effects in Flex layout, and be able to flexibly use these features in actual projects to achieve better web page layout effects.

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