How to select the current row in jquery-Front-end Q&A-php.cn

How to select the current row in jquery

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Release： 2023-05-11 22:31:36

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jQuery is a very popular JavaScript library that can help developers easily write highly interactive and responsive Web pages. In jQuery, selecting elements is a very common operation, and selecting the current row (also called current row highlighting) is an important requirement during the development process. In this article, we will explore how to select and style the current row using jQuery.

1. Requirements Analysis

In web development, we usually use tables to display data. When we move the mouse to a row (tr) of the table, we hope that the row will be highlighted to remind the user of the currently selected row. Therefore, we need to write a piece of jQuery code to achieve this requirement.

2. Code Implementation

In the process of realizing this requirement, we can use jQuery's on() method and siblings() method to select the current row and add styles to it. The specific implementation steps are as follows:

Bind a mouse over event for each row (tr) of the table, and the event is triggered when the mouse moves to a certain row.
```
$('table tr').on('mouseover', function() {
 // 鼠标滑过事件处理逻辑
});
```
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In the event processing logic, use the siblings() method to select the sibling elements of the current row, and then add styles to them.

$('table tr').on('mouseover', function() {
 $(this).siblings().removeClass('currentRow'); // 移除其他行的样式
 $(this).addClass('currentRow'); // 为当前行添加样式
});

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Define the .currentRow class in CSS to set the style of the current row.
```
.currentRow {
 background-color: #f0f0f0;
}
```
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The implementation principle of this code is that when the mouse slides over a certain row, first use the siblings() method to select the sibling elements of the current row, that is, other rows, and then use removeClass( ) method to remove the existing styles of other rows, and finally use the addClass() method to add a highlight style to the current row.

3. Example demonstration

The following is a simple example to demonstrate how to use jQuery to select the current row and add styles to it.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>jQuery选择当前行</title>
    <style>
        table {
            width: 100%;
            border-collapse: collapse;
        }
        table th, table td {
            padding: 10px;
            border: 1px solid #ccc;
            text-align: left;
        }
        .currentRow {
            background-color: #f0f0f0;
        }
    </style>
</head>
<body>
    <table>
        <thead>
            <tr>
                <th>姓名</th>
                <th>年龄</th>
                <th>性别</th>
                <th>地址</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>张三</td>
                <td>18</td>
                <td>男</td>
                <td>北京市海淀区</td>
            </tr>
            <tr>
                <td>李四</td>
                <td>20</td>
                <td>女</td>
                <td>上海市浦东新区</td>
            </tr>
            <tr>
                <td>王五</td>
                <td>22</td>
                <td>男</td>
                <td>广州市天河区</td>
            </tr>
        </tbody>
    </table>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $('table tr').on('mouseover', function() {
            $(this).siblings().removeClass('currentRow');
            $(this).addClass('currentRow');
        });
    </script>
</body>
</html>

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In the above example, we bind the mouse rollover event to each row of the table. When the mouse moves to a certain row, use the siblings() method to select other elements of the current row (i.e. other rows ), remove its existing styles, and finally add a highlight style to the current row.

4. Summary

Selecting the current row is a very common operation in web development and can be easily implemented using jQuery. By using the on() method and siblings() method, we can select the current row and add styles to it. At the same time, when adding styles to the current row, you should pay attention to defining the corresponding style class in CSS to ensure the ease of modifying the style.

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