CSS sets the height to be the same as the specified sibling
CSS sets the height to be the same as the specified sibling
In front-end development, you often encounter situations where you need to set the height of different elements to be consistent. In this case, we can use CSS to achieve the same height as specified sibling elements. This article will detail how to use CSS to set an element’s height to match that of specified sibling elements, along with precautions and specific examples.
Method 1: Using display: flex
Flex layout is a common layout method in modern front-end development. Using display: flex, you can easily achieve the same height effect. The specific steps are as follows:
- Add
display: to the parent element flex property.
<li>Place elements that need to have the same height within the same flex container. </li>
</ol>
<p>The sample code is as follows:</p>
<pre data-language="HTML"><code class="language-markup line-numbers"><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Set Height Same As Sibling Using Flexbox</title>
<style>
.flex-container {
display: flex;
}
.box1, .box2 {
background-color: #f0f0f0;
border: 1px solid #333;
padding: 10px;
margin: 10px;
}
</style>
</head>
<body>
<div class="flex-container">
<div class="box1">Box 1</div>
<div class="box2">Box 2</div></div>
</body>
</html>
In the example above,
.flex-containeris the parent container, and.box1and.box2are the elements that need to be set to the same height. By placing them in a flex container, their heights will automatically be consistent.Method 2: Using Grid Layout
In addition to Flex layout, CSS grid layout can also achieve the same height effect. The specific steps are as follows:
- Add the
display: gridproperty to the parent element. - Place the elements that need to be set to the same height in the same grid container.
The sample code is as follows:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Set Height Same As Sibling Using CSS Grid</title> <style> .grid-container { display: grid; grid-template-columns: 1fr 1fr; } .box3, .box4 { background-color: #f0f0f0; border: 1px solid #333; padding: 10px; margin: 10px; } </style> </head> <body> <div class="grid-container"> <div class="box3">Box 3</div> <div class="box4">Box 4</div> </div> </body> </html>In the above example,
.grid-containeris the parent container, and.box3and.box4are the elements that need to have the same height. By placing them in a grid container, their heights will automatically remain consistent.Method 3: Dynamically Calculate Heights with JavaScript
If you’re not using Flex or grid layout, you can also achieve the same height effect by dynamically calculating the height of elements with JavaScript. The specific steps are as follows:
- Use JavaScript to get the height of the element to be set.
- Apply the obtained height to the element to be set.
The sample code is as follows:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Set Height Same As Sibling Using JavaScript</title> <style> .box5, .box6 { background-color: #f0f0f0; border: 1px solid #333; padding: 10px; margin: 10px; } </style> </head> <body> <div class="box5" id="box5">Box 5</div> <div class="box6" id="box6">Box 6</div> <script> const box5 = document.getElementById('box5'); const box6 = document.getElementById('box6'); const height = box5.offsetHeight + 'px'; box6.style.height = height; </script> </body> </html>In the above example, JavaScript dynamically calculates the height of
box5and applies it tobox6, achieving the same height.Notes
- Using Flex or grid layouts is recommended because they are commonly used in modern front-end development and are easy to maintain and extend.
- When using JavaScript to dynamically calculate height, ensure the element’s height is known; otherwise, the calculation and application won’t be correct.
Through this article, I believe you’ve mastered how to use CSS to set an element’s height to match that of a specified sibling element. Choosing the appropriate method for your scenario can easily achieve consistent element heights and improve front-end development efficiency.
- Add the