PHP 结合 Boostrap 结合 js 实现学生列表删除编…

2019-05-22 06:37:14来源:博客园 阅读 ()

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这个自己的小项目要先告一段落了。可能还有许多bug。请见谅

 

 

删除学生功能

PHP:

// 这里是通过前端代码HTML中的 url 传过来的,用 $_GET 来获取(相关HTML代码可以看一下到主页看一下前几条博客)
if
(empty($_GET['num'])) exit('<h1>找不到您要删除的学生的学号</h1>'); $num = $_GET['num']; $connection = mysqli_connect('localhost', 'root', '密码', 'students_info_system'); if (!$connection) exit('<h1>连接数据库失败</h1>'); $query = mysqli_query($connection, "delete from students where num = {$num}"); if (!$query) exit('<h1>该学生信息查询失败</h1>'); // 注意:这里传入的是连接对象 $affected_rows = mysqli_affected_rows($connection); if ($affected_rows !== 1) exit('<h1>删除失败</h1>'); header('Location: student_info.php');

编辑学生功能(整体上和添加学生功能差不到,稍微有些许变化)

HTML:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>编辑学生</title>
    <link rel="stylesheet" type="text/css" href="css/Bootstrap.css">
</head>
<body>
    <div class="container mt-3">
        <h1 class="display-5 text-center">编辑学生</h1>
        <?php if (isset($error_msg)): ?>
        <div class="alert alert-danger"><?php echo $error_msg; ?></div>
        <?php endif ?>
        <div class="row mt-3">
            <img src="<?php echo $current_student['photo']; ?>" alt="<?php echo $current_student['name']; ?>" width="100" height="488" class="col-sm-6">
            <form action="<?php echo $_SERVER['PHP_SELF']; ?>?id=<?php echo $current_num; ?>" method="post" enctype="multipart/form-data" autocomplete="off" class="col-sm-6">
                <div class="form-group">
                    <input type="number" name="num" class="form-control" placeholder="学号" value="<?php echo isset($_POST['num']) ? $_POST['num'] : $current_student['num']; ?>">
                </div>
                <div class="form-group">
                    <select class="form-control" name="system">
                        <option>请选择学院/系</option>
                        <option <?php echo $current_student['system'] === '电气工程学院' ? 'selected' : ''; ?>>电气工程学院</option>
                        <option <?php echo $current_student['system'] === '信息工程与艺术学院' ? 'selected' : ''; ?>>信息工程与艺术学院</option>
                        <option <?php echo $current_student['system'] === '国际教育学院' ? 'selected' : ''; ?>>国际教育学院</option>
                        <option <?php echo $current_student['system'] === '水利水电工程学院' ? 'selected' : ''; ?>>水利水电工程学院</option>
                        <option <?php echo $current_student['system'] === '测绘与市政工程学院' ? 'selected' : ''; ?>>测绘与市政工程学院</option>
                        <option <?php echo $current_student['system'] === '马克思主义学院' ? 'selected' : ''; ?>>马克思主义学院</option>
                        <option <?php echo $current_student['system'] === '建筑工程学院' ? 'selected' : ''; ?>>建筑工程学院</option>
                        <option <?php echo $current_student['system'] === '经济与管理学院' ? 'selected' : ''; ?>>经济与管理学院</option>
                    </select>
                </div>
                <div class="form-group">
                    <input type="text" name="class" class="form-control" placeholder="班级" value="<?php echo isset($_POST['class']) ? $_POST['class'] : $current_student['class']; ?>">
                </div>
                <div class="form-group">
                    <input type="text" name="name" class="form-control" placeholder="姓名" value="<?php echo isset($_POST['name']) ? $_POST['name'] : $current_student['name']; ?>">
                </div>
                <div class="form-group">
                    <select class="form-control" name="gender">
                        <option value="-1">请选择性别</option>
                        <option <?php echo $current_student['gender'] === '1' ? 'selected' : ''; ?> value="1">男</option>
                        <option <?php echo $current_student['gender'] === '0' ? 'selected' : ''; ?> value="0">女</option>
                    </select>
                </div>
                <div class="form-group">
                    <label for="birthday">出生日期</label>
                    <input type="date" name="birthday" class="form-control" id="birthday" value="<?php echo isset($_POST['birthday']) ? $_POST['birthday'] : $current_student['birthday']; ?>">
                </div>
                <div class="form-group">
                    <label for="photo">照片</label>
                    <input type="file" name="photo" class="form-control">
                </div>
                <button type="submit" class="btn btn-info btn-block">确认修改</button>
            </form>
        </div>
    </div>
</body>
</html>

PHP:

if (empty($_GET['id'])) exit('<h1>必须指定相应的学号</h1>');

$current_num = $_GET['id'];

$connection = mysqli_connect('localhost', 'root', '密码', 'students_info_system');

if (!$connection) exit('<h1>连接数据库失败</h1>');

$query = mysqli_query($connection, "select * from students where num = {$current_num} limit 1");

if (!$query) exit('<h1>找不到您要编辑的学生信息</h1>');

$current_student = mysqli_fetch_assoc($query);

// var_dump($current_student);

function edit_student() {
    // var_dump('进来了');
    global $connection;
    global $current_num;    // 当前学生学号
    global $current_student;
    $extra_students_query = mysqli_query($connection, "select * from students where num != {$current_num}");

    if (!$extra_students_query) {
        exit('<h1>其余学生数据查询失败</h1>');
        // return;
    }

    // 查询除该学生以外的其他学生
    while ($student = mysqli_fetch_assoc($extra_students_query)) {
        // var_dump($student);
        $students_num[] = $student['num'];
    }

    // var_dump($students_num);
    // var_dump($_FILES['photo']);
    // var_dump($_POST['gender']);
    if (empty($_POST['num'])) {
        $GLOBALS['error_msg'] = '请输入学号';
        return;
    }

    // 判断该学号是否已经被添加(即列表中已存在该学生)=========
    if (in_array($_POST['num'], $students_num)) {
        $GLOBALS['error_msg'] = '该学生已存在';
        return;
    }

    if (empty($_POST['system']) || $_POST['system'] === '请选择学院/系') {
        $GLOBALS['error_msg'] = '请选择学院/系';
        return;
    }
    if (empty($_POST['class'])) {
        $GLOBALS['error_msg'] = '请输入班级';
        return;
    }
    if (empty($_POST['name'])) {
        $GLOBALS['error_msg'] = '请输入姓名';
        return;
    }
    if (!(isset($_POST['gender']) && $_POST['gender'] !== '-1')) {
        $GLOBALS['error_msg'] = '请选择性别';
        return;
    }
    if (empty($_POST['birthday'])) {
        $GLOBALS['error_msg'] = '请输入出生日期';
        return;
    }

    // 以下处理文件域=======================================================
    // 当有文件上传时才验证,没有上传则照片不变
    // $_FILES['photo'] = $current_student['photo'];
    // var_dump($_FILES['photo']);
    if ($_FILES['photo']['name'] !== '') {
        // var_dump($_FILES['photo']);
        // var_dump($_FILES['photo']);
        if ($_FILES['photo']['error'] !== UPLOAD_ERR_OK) {
            $GLOBALS['error_msg'] = '上传照片失败';
            return;
        }
        // 验证上传文件的类型(只允许图片)
        if (strpos($_FILES['photo']['type'], 'image/') !== 0) {
            $GLOBALS['error_msg'] = '这不是支持的文件格式类型,请重新上传';
            return;
        }
        // 文件上传到了服务端开辟的一个临时地址,需要转移到本地
        $image_target = 'images/' . $_FILES['photo']['name'];
        if (!move_uploaded_file($_FILES['photo']['tmp_name'], $image_target)) {
            $GLOBALS['error_msg'] = '图片上传失败';
            return;
        }
        
        // 接收更新过的学生照片
        $current_student['photo'] = (string)$image_target;
        
    } else {
        // var_dump($_FILES['photo']);
        // 如果照片没有上传则不进行验证文件域,直接更新数据且不改变原来的照片
        $current_student['num'] = $_POST['num'];
        $current_student['system'] = $_POST['system'];
        $current_student['class'] = $_POST['class'];
        $current_student['name'] = $_POST['name'];
        $current_student['gender'] = $_POST['gender'];
        $current_student['birthday'] = $_POST['birthday'];
    }

    
    
    // var_dump($current_num);
    // 将数据修改存放到数据库
    $update_query = mysqli_query($connection, "update students set `num` = '{$current_student['num']}', `system` = '{$current_student['system']}', `class` = '{$current_student['class']}', `name` = '{$current_student['name']}', `gender` = '{$current_student['gender']}', `birthday` = '{$current_student['birthday']}', `photo` = '{$current_student['photo']}' where `num` = {$current_num}");

    if (!$update_query) {
        $GLOBALS['error_msg'] = '更新数据查询失败';
        return;
    }

    $affected_rows = mysqli_affected_rows($connection);

    if ($affected_rows !== 1) {
        $GLOBALS['error_msg'] = '修改失败';
        return;
    }

    // 延迟2秒
    time_sleep_until(time() + 2);

    header('Location: student_info.php');
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    edit_student();
}

搜索功能(用js)

// 关键词搜索功能----立即函数
(function (element, search_key) {

    let table = document.getElementById('table-content'); // 获取表格

    function in_array_item (item, array) {
        for (var i = 0; i < array.length; i++) {
            if (array[i].indexOf(item) != -1) {
                return true;
            }
        }
        return false;
    }

    function response () {
        let hiddenStudentsNumber = 0;                          // 获取隐藏的学生个数(即表格隐藏行数)

        // 获取要搜索的关键词
        const search_content = document.getElementById(search_key).value;
        // console.log(search_content);
        // console.log(typeof(search_content));

        let data = [];
        // 遍历列表将数据存储到一个数组中
        // 1.获取表格行数
        for (let i = 0; i < table.children.length; i++) {
            // 2.获取表格列数
            for (let j = 0; j < table.children[i].children.length; j++) {
                if (!data[i]) {
                    // 在数组中创键每一行内容存放的数组,用于存放一行数据
                    data[i] = new Array();
                }
                data[i][j] = table.children[i].children[j].innerHTML.toString();
                // 3.存放数据
                if (data[i][j] === '♂') {
                    data[i][j] = '男';
                }
                if (data[i][j] === '♀') {
                    data[i][j] = '女';
                }
            }
            // console.log(data[i]);
            if (search_content == '') {
                table.children[i].style.display = '';
            } else {
                if (in_array_item(search_content, data[i])) {
                    table.children[i].style.display = '';
                } else {
                    table.children[i].style.display = 'none';
                    hiddenStudentsNumber += 1;
                }
            }
        }
        console.log(hiddenStudentsNumber);
        let str = "共有" + (table.children.length - hiddenStudentsNumber) + "名学生";
        document.getElementById('students_number').innerHTML = str;
    }

    const searchButton = document.getElementById(element);
    searchButton.addEventListener('click', function () {
        response();
    });

    document.addEventListener('keydown', function (event) {
        if (event.keyCode === 13) {
            response();
        }
    });

    let str = "共有" + table.children.length + "名学生";
    document.getElementById('students_number').innerHTML = str;
})('search', 'search-key');

同时在原有的学生信息页面HTML添加:

<div class="row mt-3">
            <a class="btn btn-info col-sm-2" style="margin-right: 28px; margin-left: 15px;" href="add_student.php">添加学生</a>
      
        // 添加的 <button class="btn btn-info align-middle" id="students_number"></button>
        
<input type="text" class="form-control col-sm-6 ml-2" autocomplete="on" placeholder="请输入关键词" value="" id="search-key"> <button type="submit" class="btn btn-info col-sm-2 ml-2" id="search">点击搜索</button> </div>

原文链接:https://www.cnblogs.com/duxiu-fang/p/10899392.html
如有疑问请与原作者联系

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