Detailed explanation of line breaks and overflow processing methods in CSS Flex flexible layout-CSS Tutorial-php.cn

Detailed explanation of line breaks and overflow processing methods in CSS Flex flexible layout

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Release： 2023-09-29 19:04:41

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详解Css Flex 弹性布局中的换行与溢出处理方法

Detailed explanation of line breaks and overflow processing methods in CSS Flex flexible layout

CSS flexible layout (Flex) is a new layout method in CSS3, which can help We lay out elements more flexibly. In Flex elastic layout, the layout of elements only depends on the settings of the parent container, and no longer requires complex relative or absolute positioning. This article will introduce in detail the newline and overflow processing methods in Flex layout, and combine it with specific code examples to help readers better understand and use it.

1. Line wrap processing method
In Flex layout, when the total width of the child elements exceeds the width of the parent container, sometimes we need to perform line wrap processing. The following are some common ways to handle line breaks:

flex-wrap attribute: The flex-wrap attribute is used to set whether to wrap lines. By default, its value is nowrap, which means no line wrapping. You can set it to wrap to achieve automatic line wrapping. For example:
```
.container {
 display: flex;
 flex-wrap: wrap;
}
```
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flex-direction property: The flex-direction property can also be used to control line wrapping. It has four possible values: row, row-reverse, column, column-reverse. The default value is row, which means arranging child elements in the same row. If set to column, child elements will be arranged vertically. When the total width of the child element exceeds the width of the parent container, it will automatically wrap. For example:
```
.container {
 display: flex;
 flex-direction: column;
}
```
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Use the flex-basis attribute: The flex-basis attribute is used to set the initial length of the element. You can change the width of child elements by setting different flex-basis values to achieve a line wrapping effect. For example:
```
.container {
 display: flex;
}
.item {
 flex-basis: 200px;
}
```
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2. Overflow processing method
When the length of the child element exceeds the length of the parent container, sometimes we need to process the overflow content. The following are some common overflow handling methods:

overflow attribute: The overflow attribute is used to set how overflow content is handled. By default, its value is visible, which means no processing is performed. You can set it to hidden to hide overflow content. For example:
```
.container {
 display: flex;
 overflow: hidden;
}
```
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Use the flex attribute: The flex attribute is the abbreviation of flex-grow, flex-shrink and flex-basis. Among them, flex-basis is used to set the initial length of the element. You can change the width of child elements by setting different flex-basis values to achieve the hiding effect of overflow content. For example:
```
.container {
 display: flex;
}
.item {
 flex: 0 0 200px;
 overflow: hidden;
}
```
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Use the text-overflow attribute: The text-overflow attribute is used to set the display method of overflow content. It only works on one line of text content. It can be set to ellipsis to achieve the ellipsis display effect of overflow content. For example:
```
.container {
 display: flex;
}
.item {
 white-space: nowrap;
 overflow: hidden;
 text-overflow: ellipsis;
}
```
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3. Sample code analysis
The following is a sample code analysis, showing the specific application of line breaks and overflow processing methods in Flex layout:

<!DOCTYPE html>
<html>
<head>
    <style>
        .container {
            display: flex;
            flex-wrap: wrap;
            width: 400px;
            border: 1px solid #ccc;
        }
        .item {
            flex-basis: 200px;
            height: 100px;
            border: 1px solid #ccc;
            margin: 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 class="item">Item 4</div>
        <div class="item">Item 5</div>
        <div class="item">Item 6</div>
        <div class="item">Item 7</div>
        <div class="item">Item 8</div>
    </div>
</body>
</html>

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In the above code, the width of the container element is 400px, the flex-wrap attribute is set to wrap, and the flex-basis attribute of the child element is set to 200px. When the container is not wide enough to accommodate all child elements, it will automatically wrap and adjust the width of the child elements.

At the same time, the height of the child element is set to 100px, and the layout is made more intuitive by setting styles such as borders and margins. Readers can modify the code according to their own needs and learn more about line breaks and overflow processing methods in Flex layout.

Summary
This article introduces the newline and overflow processing methods in Flex layout in detail, and analyzes it with specific code examples. In actual development, the flexible use of these methods can help us better handle the layout and overflow content of elements and improve user experience. Readers can carry out further practice and application according to their own needs.

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