CSS select odd child elements
CSS Select Odd Child Elements
In front-end development, we often need to style the odd-numbered children of a group of elements. This is where CSS selectors come in handy. By selecting odd-numbered children with CSS, we can easily style elements across the page, making them look more aesthetically pleasing and unified.
Using the :nth-child Selector to Select Odd-Numbered Children
In CSS, we can use the :nth-child selector to select the children of an element, passing in a parameter to select a specific child. To select the odd-numbered child, simply pass the “odd” parameter to the :nth-child(odd) selector.
The sample code is as follows:
/* Select odd-numbered child elements */
li:nth-child(odd) {
background-color: #f2f2f2;
}
In the example code above, we use the :nth-child(odd) selector to select the odd-numbered child elements of the li element and set their background color to #f2f2f2. This will give the odd-numbered child elements on the page a gray background.
Actual Application Scenarios
List Elements
In web development, we often use list elements (such as ul and ol). If we want to style the odd-numbered rows in a list, we can use the :nth-child selector.
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>Odd List Items</title>
<style>
/* Select odd numbered rows */
li:nth-child(odd) {
background-color: #f2f2f2;
}
</style>
</head>
<body>
<h1>Odd List Items</h1>
<ul>
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
<li>Item 4</li>
<li>Item 5</li> </ul>
</body>
</html>
In the example code above, we use the :nth-child(odd) selector to select the odd-numbered rows (li elements) within the ul element and set their background color to #f2f2f2. This gives the odd-numbered rows in the list a gray background.
Table Elements
Another common application scenario is the table element. When we want to style the odd-numbered rows within a table, we can also use the :nth-child selector.
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>Odd Table Rows</title>
<style>
/* Select odd numbered rows */
tr:nth-child(odd) {
background-color: #f2f2f2;
}
</style>
</head>
<body>
<h1>Odd Table Rows</h1>
<table>
<tr>
<td>Row 1, Data 1</td>
<td>Row 1, Data 2</td>
</tr>
<tr>
<td>Row 2, Data 1</td> <td>Row 2, Data 2</td>
</tr>
<tr>
<td>Row 3, Data 1</td>
<td>Row 3, Data 2</td>
</tr>
</table>
</body>
</html>
In the example code above, we use the :nth-child(odd) selector to select the odd-numbered rows (tr elements) in the table and set their background color to #f2f2f2. This gives the odd-numbered rows a gray background.
Conclusion
Through this article, we learned how to use the :nth-child selector to select odd-numbered child elements and demonstrated it with a practical example.