What is a flexible layout container?

The container of flexible layout refers to the parent element that applies flexible layout technology. By setting the properties and values ​​of the container, you can control how the child elements within the container are arranged, aligned, and scaled. Common flexible layout container properties: 1. display, set the container to a flexible layout; 2. flex-direction, set the direction of the main axis; 3. flex-wrap, specify whether to allow sub-elements to wrap; 4. justify-content, set the sub-elements to wrap. The alignment of elements on the main axis; 5. align-items, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Flexbox is a technology for creating flexible and adaptive layouts that provides a simple way to arrange and align elements across a variety of different screen sizes and devices .

The container of flexible layout refers to the parent element that applies flexible layout technology. By setting the properties and values ​​of the container, we can control how the child elements within the container are arranged, aligned, and scaled.

In flexible layout, there are two main concepts: main axis and cross axis. The main axis refers to the direction in which elements are arranged within the container, which can be horizontal (left to right) or vertical (top to bottom). The cross axis is perpendicular to the main axis and is used to align elements.

The following are some common flexible layout container properties:

display: Set the container to flexible layout. Define the container as a flexible layout by setting the display property to flex or inline-flex. flex represents block-level elements, and inline-flex represents inline elements.

flex-direction: Set the direction of the main axis. The default value is row, which means the main axis is horizontal. Other values ​​include column (the main axis is vertical), row-reverse (the main axis is horizontal and elements are arranged from right to left), and column-reverse (the main axis is vertical and elements are arranged from bottom to top).

flex-wrap: Specifies whether to allow sub-elements to wrap. By default, all child elements in a flex container are aligned as closely as possible. Setting the flex-wrap attribute to wrap can cause child elements to wrap automatically when they need to wrap.

justify-content: Set the alignment of child elements on the main axis. You can use this property to control the horizontal position of child elements within the container. Common values ​​include flex-start (left-aligned), flex-end (right-aligned), center (center-aligned), space-between (evenly distributed on the main axis), and space-around (evenly distributed on the main axis, with left margins on both sides). There is white space) etc.

align-items: Set the alignment of child elements on the cross axis. You can use this property to control the vertical position of child elements within the container. Common values ​​include flex-start (top alignment), flex-end (bottom alignment), center (center alignment), baseline (aligned to the first line of text baseline), stretch (stretch to fill the entire container), etc.

align-content: Set the alignment of multi-line child elements on the cross axis. When the child element has multiple rows, you can use this attribute to control the vertical position of the multi-line child element in the container. Common values ​​are similar to align-items.

The above are some common uses of container attributes of flexible layout. By adjusting these properties and values, we can easily create a variety of different layout effects. The container attribute of elastic layout provides a more flexible and adaptive layout method, which is suitable for diverse application scenarios such as responsive design and mobile devices.

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