A guide to CSS flex layout properties: flex-direction and flex-wrap

CSS Flexible Layout Property Guide: flex-direction and flex-wrap

In CSS flexible layout, flex-direction and flex-wrap are two key properties , they can help us better control the arrangement and wrapping behavior of flex boxes. This article will introduce you to these two properties in detail and provide specific code examples.

1. flex-direction attribute

The flex-direction attribute is used to determine the main axis direction of the elements inside the flexible box. The main axis direction can be horizontal (row) or vertical (column).

Commonly used values:

1. row: Default value, the main axis is horizontal.
2. row-reverse: The main axis is horizontal, opposite to row.
3. column: The main axis is vertical.
4. column-reverse: The main axis is vertical, opposite to column.

Code example:

.container {
  display: flex;
  flex-direction: row;
}

The above code will create a flexible container in which the child elements will be arranged horizontally according to the default main axis direction.

2. flex-wrap attribute

The flex-wrap attribute is used to determine whether to wrap when the elements in the flexible container exceed the container size.

Commonly used values:

1. nowrap: Default value, no line wrapping, so that child elements are arranged in one line, which may cause overflow.
2. wrap: When the width of the child element exceeds the width of the container, wrap and continue to arrange.
3. wrap-reverse: When the width of the child element exceeds the width of the container, wrap in reverse and continue to arrange.

Code example:

.container {
  display: flex;
  flex-wrap: wrap;
}

The above code will create a flexible container that will automatically wrap when the container is not wide enough to accommodate all child elements.

Comprehensive example:

The following is an example of comprehensive application of flex-direction and flex-wrap.

.container {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
}

.item {
  width: 200px;
  height: 200px;
  margin: 10px;
}

<div class="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
  <div class="item">5</div>
  <div class="item">6</div>
</div>

The above code will create a vertical flexible container. When the container width is not enough to accommodate all child elements, it will automatically wrap and arrange.

Summary:

flex-direction and flex-wrap are very important properties in CSS elastic layout. By flexibly using these two properties, you can easily achieve different layout effects. Mastering their usage will greatly improve our page layout capabilities. Hope this article is helpful to you.

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