Why flexbox is a one-dimensional layout

Flexible box is a one-dimensional layout mainly because its arrangement only involves one dimension, that is, the main axis direction. The main feature of the flexible box is to arrange and layout elements in the main axis direction, and in the cross axis direction. The layout relationship is less affected. In contrast, the traditional box model is based on two-dimensional layout, and elements have layout relationships in both horizontal and vertical directions. Flexible boxes limit the layout to one dimension by introducing the concepts of main axis and cross axis, making the layout More flexible and convenient.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Flexbox (Flexbox) is a CSS module used for web page layout. It provides a flexible way to perform one-dimensional layout, that is, to arrange elements in one dimension. Why is flexbox called a one-dimensional layout? I'll explain it in detail below.

1. The concept of one-dimensional layout

One-dimensional layout refers to arranging elements in one dimension, that is, the arrangement direction of elements can only be horizontal or vertical. In a one-dimensional layout, the size and position of elements are controlled primarily by properties in that dimension and less so by properties in another dimension.

2. Characteristics of Flexible Box

Flexible box is a CSS module used for one-dimensional layout. It has the following characteristics:

1. Main axis and Cross axis: Flexbox has the concept of main axis and cross axis. The main axis refers to the arrangement direction of the flexible boxes, which can be the horizontal direction (row) or the vertical direction (column). The cross axis is the direction perpendicular to the main axis.

2. Flexible container and flexible items: Flexible box consists of flexible containers and flexible items. Flexible container refers to the parent element with flexible box layout applied, and its display attribute is set to flex or inline-flex. Flex items are child elements in a flex container that are arranged according to the rules of the flex box.

3. Properties of flexible containers: Flexible containers can control the arrangement of flexible items by setting a series of properties. The main properties include: flex-direction (main axis direction), justify-content (alignment on the main axis), align-items (alignment on the cross axis) and flex-wrap (line wrapping), etc.

4. Properties of flexible items: Flexible items can control their size and position by setting a series of properties. The main properties include: flex-grow (enlargement ratio), flex-shrink (reduction ratio), flex-basis (base size) and align-self (alignment on the cross axis), etc.

3. Why the flexible box is a one-dimensional layout

The flexible box is called a one-dimensional layout, mainly because its arrangement only involves one dimension, that is, the main axis direction. The main feature of the flexible box is to arrange and layout elements in the main axis direction, but has less impact on the layout relationship in the cross-axis direction.

In contrast, the traditional box model (block and inline) is based on two-dimensional layout, and elements have layout relationships in both horizontal and vertical directions. The flexible box limits the layout to one dimension by introducing the concepts of main axis and cross axis, making the layout more flexible and convenient.

To sum up, flexible box is a CSS module used for one-dimensional layout. It uses the concepts of main axis and cross axis to make the arrangement and layout of elements mainly controlled by the direction of the main axis, so it is called One-dimensional layout. Flexbox is characterized by the concepts of main axis and cross axis, flexible container and flexible items, and it controls the layout by setting a series of properties.

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