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How to use the Layui framework to develop a permission management system that supports multi-user login

王林Original: 2023-10-27 13:27:191350browse

Introduction:
In the modern Internet era, more and more applications It is necessary to support multi-user login to achieve personalized functions and permission management. In order to protect the security of the system and the privacy of data, developers need to use certain means to implement multi-user login and permission management functions. This article will introduce how to use the Layui framework to develop a permission management system that supports multi-user login, and give specific code examples.

Preparation
Before starting development, we need to prepare some necessary tools and resources. First, we need to download and install the Layui framework. You can download the latest stable version from the official website. Secondly, we need a server environment that supports PHP, which can be built using an integrated environment such as XAMPP. Finally, we need a database to store user information and permission data. You can choose MySQL or other relational databases.
Database Design
Before designing the database, we need to determine the functions and permission levels required by the system. Suppose our permission management system has three roles: administrator, ordinary user and guest. Administrators have the highest authority and can manage users and permissions; ordinary users can use various functions of the system; visitors can only browse the public content of the system.

We can design a user table and a role table to store user information and role information. The user table contains user ID, user name, password and other fields; the role table contains role ID, role name and other fields. In addition, we can also design a permission table to store permission information for various functions and pages. The permission table includes fields such as permission ID, permission name, and permission URL.

Design of login page
It is very simple to design a login page using the Layui framework. We can use Layui's form module to create a login form and add corresponding validation rules and event handling functions. The following is a sample code for a simple login page:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>登录</title>
    <link rel="stylesheet" href="layui/css/layui.css">
</head>
<body>
    <div class="layui-container">
        <form class="layui-form" action="login.php" method="post">
            <div class="layui-form-item">
                <label class="layui-form-label">用户名</label>
                <div class="layui-input-inline">
                    <input type="text" name="username" lay-verify="required" placeholder="请输入用户名" autocomplete="off" class="layui-input">
                </div>
            </div>
            <div class="layui-form-item">
                <label class="layui-form-label">密码</label>
                <div class="layui-input-inline">
                    <input type="password" name="password" lay-verify="required" placeholder="请输入密码" autocomplete="off" class="layui-input">
                </div>
            </div>
            <div class="layui-form-item">
                <div class="layui-input-block">
                    <button class="layui-btn" lay-submit lay-filter="login-btn">登录</button>
                </div>
            </div>
        </form>
    </div>

    <script src="layui/layui.js"></script>
    <script>
        layui.use(['form'], function() {
            var form = layui.form;

            form.on('submit(login-btn)', function(data) {
                // 处理登录请求
            });
        });
    </script>
</body>
</html>

Login verification and permission management
In the login page, we can use AJAX technology to send the username and password to the background for processing verify. After receiving the login request in the background, PHP can be used to verify the user name and password, and set the corresponding login status and permissions based on the verification results.

First, we need to write a login.php script to handle login requests. In this script, we can verify the correctness of the username and password by querying the user table, and return the query results to the front-end page. The following is a sample code of a simplified login.php script:

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "root", "123456", "mydb");
if (!$conn) {
    die("连接数据库失败：" . mysqli_connect_error());
}

// 处理登录请求
$username = $_POST["username"];
$password = $_POST["password"];

$sql = "SELECT * FROM user WHERE username='" . $username . "' AND password='" . $password . "'";
$result = mysqli_query($conn, $sql);

if (mysqli_num_rows($result) > 0) {
    // 登录成功，设置登录状态和权限
    session_start();
    $_SESSION["username"] = $username;

    // 获取用户角色
    $role = mysqli_fetch_assoc($result)["role"];

    // 根据角色设置权限
    if ($role == "admin") {
        // 设置管理员权限
        $_SESSION["role"] = "admin";
    } else if ($role == "user") {
        // 设置普通用户权限
        $_SESSION["role"] = "user";
    } else {
        // 设置访客权限
        $_SESSION["role"] = "guest";
    }

    echo "success";
} else {
    // 登录失败
    echo "error";
}

// 关闭数据库连接
mysqli_close($conn);
?>

After completing the login verification, we can decide which functions and pages the user can access based on the user's permissions. When creating each function and page, we can use PHP to determine the user's permissions and perform corresponding processing based on the judgment results.

Design of permission management page
It is also very simple to use the Layui framework to design the permission management page. We can use Layui's table module to create a table and add corresponding data and event handling functions. The following is a sample code for a simple permission management page:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>权限管理</title>
    <link rel="stylesheet" href="layui/css/layui.css">
</head>
<body>
    <div class="layui-container">
        <table class="layui-table" lay-data="{url:'get_permissions.php', page:true, limit:10, id:'permission_table'}" lay-filter="permission_table">
            <thead>
                <tr>
                    <th lay-data="{field:'id', width:80, sort:true}">ID</th>
                    <th lay-data="{field:'name', width:120}">权限名</th>
                    <th lay-data="{field:'url'}">URL</th>
                </tr>
            </thead>
        </table>
    </div>

    <script src="layui/layui.js"></script>
    <script>
        layui.use(['table'], function() {
            var table = layui.table;

            // 监听表格事件
            table.on('tool(permission_table)', function(obj) {
                var data = obj.data;

                if (obj.event === 'edit') {
                    // 编辑权限
                    editPermission(data);
                } else if (obj.event === 'delete') {
                    // 删除权限
                    deletePermission(data);
                }
            });

            // 编辑权限
            function editPermission(data) {
                // TODO: 编辑权限的逻辑
            }

            // 删除权限
            function deletePermission(data) {
                // TODO: 删除权限的逻辑
            }
        });
    </script>
</body>
</html>

In the permission management page, we can listen to the events of the table and trigger the corresponding event handler when the user clicks the edit or delete button. . In the event handling function, we can use AJAX technology to send the corresponding operation to the background for processing.

Summary
Through the introduction of this article, we have learned how to use the Layui framework to develop a permission management system that supports multi-user login, and given corresponding code examples. In actual development, we can expand the functions and permissions of the system according to actual needs, and optimize and adjust the code. I hope this article can be helpful to everyone, and everyone is welcome to practice and communicate.

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