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静态单页-项目数据-无刷新分页-增删改…

将项目改造成无刷新分页,前端用Ajax实现数据异步加载
实现记录的编辑与删除功能,想一下如何优雅的实现它

1. 往 staffs 表添加默认数据

insert staffs (name,gender, salary, email,birthday) values
     ('king','male',6500,'king@php.cn','1992-10-29'),
     ('amy','female',7800,'amy@163.com','1998-10-22'),
     ('betty','female',9800,'betty@qq.com','1953-10-19'),
     ('jack','male',12500,'jack@php.cn', '1977-10-24'),
     ('marry','female',15800,'marry@php.cn', '1990-01-08'),
     ('alice','female',8600,'alice@php.cn','1989-09-18'),
     ('admin','male',16600,'admin@php.cn','1989-09-18'),
     ('lisa','female',13500,'lisa@qq.com','1983-09-13'),
     ('peter','male',9600,'peter@163.com','1993-09-29'),
     ('linda','female',5600,'linda@163.com','1993-09-29');

2. 新建前端渲染文件 0226.html

<!DOCTYPE html>
<html lang="zh-CN">
<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>员工管理系统</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <table>
        <caption>员工管理系统</caption>
        <thead>
            <tr>
                <td>编号</td>
                <td>姓名</td>
                <td>性别</td>
                <td>工资</td>
                <td>邮箱</td>
                <td>生日</td>
                <td>入职时间</td>
                <td>操作</td>
            </tr>
        </thead>
        <!-- 数据渲染区 -->
        <tbody></tbody>
    </table>
    <!-- 分页渲染区 -->
    <p></p>
    <!-- 模态框编辑区 -->
    <div class="modal">
        <div class="modal-drop"></div>
        <div class="modal-body">
            <button class="close">关闭</button>
            <form action="" name="editform">
                <table>
                    <caption>员工信息编辑</caption>
                    <tbody>
                        <tr>
                            <td>姓名</td>
                            <td><input type="text" value="" name="name" id="name"></td>
                        </tr>
                        <tr>
                            <td>性别</td>
                            <td>
                                <select name="gender" id="gender">
                                    <option value="male" selected>男</option>
                                    <option value="female">女</option>
                                </select>
                            </td>
                        </tr>
                        <tr>
                            <td>工资</td>
                            <td><input type="text" value="" name="salary" id="salary"></td>
                        </tr>
                        <tr>
                            <td>邮箱</td>
                            <td><input type="text" value="" name="email" id="email"></td>
                        </tr>
                        <tr>
                            <td>生日</td>
                            <td><input type="text" value="" name="birthday" id="birthday"></td>
                        </tr>
                        <tr>
                            <td colspan="2"><button class="save">保存</button></td>
                        </tr>
                    </tbody>
                </table>
            </form>
        </div>
    </div>
    <!-- 模态框样式 -->
    <style>
        /* 模态框初始化隐藏 */
        .modal {
            display: none;
        }
        /* 遮罩层 */
        .modal .modal-drop {
            position: fixed;
            background-color: rgb(0, 0, 0, .5);
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
        }
        .modal .modal-body {
            position: fixed;
            background-color: #fff;
            padding: 1em;
            overflow: hidden;
            max-width: 25em;
            max-height: 20em;
            /* 水平垂直自动居中 */
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
        }
        /* 关闭按钮 */
        .modal .modal-body .close {
            position: absolute;
            top: 1.1em;
            right: 1.5em;
            width: 3em;
            height: 1.5em;
        }
    </style>
    <!-- 引入js文件 -->
    <script src="0226.js"></script>
</body>
</html>

3. 引入的 style.css 是默认的

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  color: #555;
}
body {
  display: flex;
  flex-direction: column;
  align-items: center;
}
/*表格样式*/
table {
  width: 90%;
  border: 1px solid;
  border-collapse: collapse;
  text-align: center;
}
table caption {
  font-size: 1.2rem;
  margin: 10px;
}
table td,
table th {
  border: 1px solid;
  padding: 5px;
}
table tr:hover {
  background-color: #eee;
}
table thead tr:only-of-type {
  background-color: lightcyan;
}
table button {
  width: 56px;
  height: 26px;
}
table button:last-of-type {
  color: red;
}
table button {
  cursor: pointer;
  margin: 0 3px;
}
/*分页条样式*/
body > p {
  display: flex;
}
p > a {
  text-decoration: none;
  color: #555;
  border: 1px solid #888;
  padding: 5px 10px;
  margin: 10px 2px;
}
.active {
  background-color: seagreen;
  color: white;
  border: 1px solid seagreen;
}

4. 引入的 0226.js 文件代码

// 页面载入完成时默认渲染第一页数据
window.onload = function () {
    select(1);
};
// 增
// ...
// 编辑和删除记录
document.querySelector('table:first-of-type tbody').addEventListener('click', ev => {
    // 获取记录 id
    const id = ev.target.parentNode.parentNode.querySelector('td').textContent * 1;
    // 操作类型
    switch (ev.target.textContent) {
        case '编辑':
            // 显示模态框
            document.querySelector('.modal').style.display = 'block';
            // 点击关闭按钮，关闭模态框
            document.querySelector('.modal .close').addEventListener('click', (eve) => {
                document.querySelector('.modal').style.display = 'none';
            });
            // 点击编辑按钮，关闭模态框
            document.querySelector('.modal .save').addEventListener('click', (eve) => {
                document.querySelector('.modal').style.display = 'none';
            });
            // 点击模态框之外区域也关闭模态框
            document.querySelector('.modal .modal-drop').addEventListener('click', (eve) => {
                document.querySelector('.modal').style.display = 'none';
            });
            // 获取数据
            let name = ev.target.parentNode.parentNode.querySelector('td:nth-of-type(2)').textContent;
            let gender = ev.target.parentNode.parentNode.querySelector('td:nth-of-type(3)').textContent;
            let salary = ev.target.parentNode.parentNode.querySelector('td:nth-of-type(4)').textContent * 1;
            let email = ev.target.parentNode.parentNode.querySelector('td:nth-of-type(5)').textContent;
            let birthday = ev.target.parentNode.parentNode.querySelector('td:nth-of-type(6)').textContent;
            // console.log(id, name, gender, salary, email, birthday);
            // 渲染到模态框
            document.getElementById('name').value = name;
            document.getElementById('gender').value = gender;
            document.getElementById('salary').value = salary;
            document.getElementById('email').value = email;
            document.getElementById('birthday').value = birthday;
            // 编辑事件
            document.querySelector('.modal .save').addEventListener('click', (eve) => {
                // 禁止默认提交
                eve.preventDefault();
                // 获取模态框编辑数据
                name = document.getElementById('name').value;
                gender = document.getElementById('gender').value;
                salary = document.getElementById('salary').value;
                email = document.getElementById('email').value;
                birthday = document.getElementById('birthday').value;
                // console.log(id, name, gender, salary, email, birthday);
                // 创建对象
                let xhr = new XMLHttpRequest();
                // 配置参数
                xhr.open('post', 'handle.php?action=update&id=' + id);
                // 处理请求
                xhr.onload = () => {
                    // console.log(xhr.response);
                    // 更新数据写回页面
                    ev.target.parentNode.parentNode.querySelector('td:nth-of-type(2)').textContent = name;
                    ev.target.parentNode.parentNode.querySelector('td:nth-of-type(3)').textContent = gender;
                    ev.target.parentNode.parentNode.querySelector('td:nth-of-type(4)').textContent = salary;
                    ev.target.parentNode.parentNode.querySelector('td:nth-of-type(5)').textContent = email;
                    ev.target.parentNode.parentNode.querySelector('td:nth-of-type(6)').textContent = birthday;
                };
                // 发送请求
                xhr.send(new FormData(document.forms.namedItem('editform')));
            });
            break;
        case '删除':
            if (confirm('确认删除编号 ' + id + ' 记录?')) {
                // 创建对象
                let xhr = new XMLHttpRequest();
                // 配置参数
                xhr.open('get', 'handle.php?action=delete&id=' + id);
                // 处理请求
                xhr.onload = () => {
                    // 删除节点
                    ev.target.parentNode.parentNode.remove();
                };
                // 发送请求
                xhr.send(null);
            }
            break
    }
});
// 查
function select(page = 1) {
    // 创建对象
    const xhr = new XMLHttpRequest();
    // 配置参数
    xhr.open('get', 'handle.php?action=select&page=' + page);
    // 处理请求
    xhr.onload = () => {
        // json 格式数据解析为 js 对象
        // console.log(xhr.response);
        let res = JSON.parse(xhr.response);
        let pages = res.pages;
        let staffs = res.staffs;
        // 渲染数据
        document.querySelector('table:first-of-type tbody').innerHTML = get_datas(staffs);
        // 渲染分页
        document.querySelector('p:first-of-type').innerHTML = get_pages(page, pages);
    };
    // 发送请求
    xhr.send(null);
}
// 无刷新分页
document.querySelector('p:first-of-type').addEventListener('click', ev => {
    // 禁用默认跳转
    ev.preventDefault();
    // 点击当前激活页，无效点击
    if (ev.target.classList.contains('active')) return;
    // 去掉原激活样式
    [...ev.currentTarget.children].forEach(ele => ele.classList.remove('active'));
    // 当前页添加激活样式
    ev.target.classList.add('active');
    let url = ev.target.href, page;
    // 获取页码
    if (url.indexOf("?") !== -1) {
        page = url.split("=")[1];
    } else {
        page = 1;
    }
    // 渲染点击页的数据
    select(page);
});
// 渲染数据
function get_datas(datas) {
    let str = '';
    for (let i = 0; i < datas.length; i++) {
        str += '<tr>';
        str += '<td>' + datas[i]['id'] + '</td>';
        str += '<td>' + datas[i]['name'] + '</td>';
        str += '<td>' + datas[i]['gender'] + '</td>';
        str += '<td>' + datas[i]['salary'] + '</td>';
        str += '<td>' + datas[i]['email'] + '</td>';
        str += '<td>' + datas[i]['birthday'] + '</td>';
        str += '<td>' + datas[i]['create_at'] + '</td>';
        str += '<td><button>编辑</button><button>删除</button></td>';
        str += '</tr>';
    }
    return str;
}
// 分页数据
function get_pages(page = 1, pages) {
    let paginate = '';
    let active = '';
    // 首页|上一页
    if (page <= 1) page = 1;
    if (page !== 1) {
        paginate += '<a href="' + document.URL + '?p=1">首页</a>';
        paginate += '<a href="' + document.URL + '?p=' + Math.max(1, page - 1) + '">上一页</a>';
    }
    // 高亮分页
    for (i = 1; i <= pages; i++) {
        active = '';
        if (page == i) active = ' class="active"';
        paginate += '<a href="' + document.URL + '?p=' + i + '"' + active + '>' + i + '</a>';
    }
    // 下一页|尾页
    if (page >= pages) page = pages;
    if (page !== pages) {
        paginate += '<a href="' + document.URL + '?p=' + Math.min(page + 1, pages) + '">下一页</a>';
        paginate += '<a href="' + document.URL + '?p=' + pages + '">尾页</a>';
    }
    return paginate;
}

5. 后端处理 handle.php

<?php
$config = [
    'type' => 'mysql',
    'host' => '127.0.0.1',
    'dbname' => 'phpedu',
    'port' => '3306',
    'charset' => 'utf8mb4',
    'username' => 'root',
    'password' => 'root',
];
extract($config);
$dsn = sprintf('%s:host=%s;dbname=%s;port=%s;charset=%s', $type, $host, $dbname, $port, $charset);
try {
    $pdo = new PDO($dsn, $username, $password);
    // 设置结果集的返回类型
    $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
    // var_dump($pdo,'连接成功');
} catch (PDOException $e) {
    die('连接失败:' . $e->getMessage());
}
// 每页显示记录数
$action = $_GET['action'] ?? 'select';
$page = $_GET['page'] ?? 1;
switch ($action) {
        // 增
    case 'add':
        // ...
        break;
        // 删
    case 'delete':
        die(del_data($pdo, $_GET['id'] ?? 0));
        break;
        // 改
    case 'update':
        $id = $_GET['id'] ?? 0;
        $name = $_POST['name'];
        $gender = $_POST['gender'];
        $salary = $_POST['salary'];
        $email = $_POST['email'];
        $birthday = $_POST['birthday'];
        die(update_data($pdo, $id, $name, $gender, $salary, $email, $birthday));
        break;
        // 查
    case 'select':
        die(get_datas($pdo, $page));
}
// 更新记录
function update_data($pdo, $id, $name, $gender, $salary, $email, $birthday)
{
    if ($id) {
        $sql = "UPDATE staffs SET name = :name, gender = :gender, salary = :salary, email = :email, birthday = :birthday WHERE id = :id";
        $stmt = $pdo->prepare($sql);
        $stmt->bindParam(':id', $id, PDO::PARAM_INT);
        $stmt->bindParam(':name', $name, PDO::PARAM_STR);
        $stmt->bindParam(':gender', $gender, PDO::PARAM_STR);
        $stmt->bindParam(':salary', $salary, PDO::PARAM_INT);
        $stmt->bindParam(':email', $email, PDO::PARAM_STR);
        $stmt->bindParam(':birthday', $birthday, PDO::PARAM_STR);
        $stmt->execute();
        if ($stmt->rowCount() > 0) {
            return '更新成功！';
        }
    }
    return '更新错误！';
}
// 删除记录
function del_data($pdo, $id = 0)
{
    if ($id) {
        $sql = "DELETE FROM staffs WHERE id = :id";
        $stmt = $pdo->prepare($sql);
        $stmt->bindParam(':id', $id, PDO::PARAM_INT);
        $stmt->execute();
        if ($stmt->rowCount() > 0) {
            return '删除成功！';
        }
    }
    return '删除错误！';
}
// 数据总页数
function get_pages($pdo, $page = 1, $num = 5)
{
    // 总页数
    $num = 5;
    $offset = ($page - 1) * $num;
    $sql = "SELECT CEIL(COUNT(1)/{$num}) total FROM staffs";
    $pages = $pdo->query($sql)->fetch()['total'];
    return $pages;
}
// 每页显示数
function get_datas($pdo, $page = 1, $num = 5)
{
    // 获取总页数
    $pages = get_pages($pdo);
    // 每页显示的数据
    $offset = ($page - 1) * $num;
    $sql = "SELECT * FROM `staffs` LIMIT {$offset}, {$num}";
    $stmt = $pdo->prepare($sql);
    $stmt->execute();
    $staffs = $stmt->fetchAll();
    $staffs = $pdo->query($sql)->fetchAll();
    return json_encode(['pages' => $pages, 'staffs' => $staffs]);
}

运行 0226.html 附图

效果图

点击第 3 页，ajax 翻页

ajax翻页

点击编号是 14 倒数第2个记录，模态框编辑

模态框编辑

修改姓名 peter 为 test 性别为女，保存，信息无刷新回滚页面

编辑信息

删除刚修改的姓名为 test 的记录，单击确认

删除记录

编号为 14 的记录，已无刷新删除

无刷新删除

Correcting teacher：

天蓬老师

Correction status：qualified

Teacher's comments：完成的相当棒,已经有一个项目的雏形了

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