javascript - php/jQuery 获取所选值的主键

Question

我正在尝试获取表单中选定值的键(主键)，因此我可以将键添加到连接表中。我将表单从下拉列表更改为自动完成。但不知道如何使用 jquery 进行映射。

这是我的自动完成 php

<?php
if (isset($_POST['type']) && $_POST['type'] == 'faculty_id') {

    $type = $_POST['type'];
    $name = $_POST['name_startsWith'];
    $nameID = $_POST['nameID'];


    $query = "SELECT FirstName, LastName, FacultyId FROM Test.Faculty where UPPER(FirstName) LIKE '" . strtoupper($name) . "%'";
    $result = mysqli_query($con, $query);
    $data = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $name = $row['FirstName'] . ' ' . $row['LastName'];
        $nameID = $row['FacultyId'];
        array_push($data, $name);
    }
    mysqli_close($con);


    echo json_encode($data);
    exit;
}
?>

这是表单和 jQuery 页面

<form action="Form.php" method="post">
    <input type='text'  id="faculty_id" placeholder="Instructor" name="faculty_id" value='' />

    <input type="submit" value="submit" name="submit" />
</form>
<script type="text/javascript">

    $('#faculty_id').autocomplete({
        source: function (request, response) {
            $.ajax({
                url: 'Form.php',
                dataType: "json",
                method: 'post',
                data: {
                    name_startsWith: request.term,
                    nameID: request.term,
                    type: 'faculty_id'
                },
                success: function (data) {
                    response($.map(data, function (item) {
                        console.log(item);
                        //var code = item.split("|");
                        return {
                            label: item,
                            value: item,
                            data: item
                        }
                    }));
                }
            });
        },
        autoFocus: true,
        minLength: 1,

    });
</script>

和 php 插入查询

<?php
if (isset($_POST)) {
    $faculty_id = $_POST['faculty_id'];
    try {
        $stat = $db->prepare("Insert into ATCTest.Schedule
                      (Faculty ) 
                      VALUE (':faculty_id' )");
        $stat->bindParam(":faculty_id", $faculty_id);

        if ($stat->execute()) {
            echo "<h5>Faculty-js: " . $faculty_id . "</h5>";
        } else {
            echo "Problem!!!";
        }
    } catch (PDOException $e) {
        echo $e->getMessage();
    }
}

Answer 1

1. 保持一致。选择 PDO或 MySQLi .不是都。您的自动完成脚本使用 MySQLi，但随后在您的插入脚本中，您使用 PDO。选择一个并坚持下去。

我将使用 PDO，因为我发现它比 MySQLi 更容易使用。

1. 使用适当的请求方法。如果您要获取某些东西，请使用 GET 而不是 POST。如果您要添加或更新，请使用 POST。

让我们重写您的自动完成脚本以使用 PDO:

    if (isset($_GET['type']) && $_GET['type'] == 'faculty_id') {
        // this will hold your response that gets sent back
        $data = null;
        $name = trim($_GET['name']);

        try {
            // because you are passed untrusted data, use prepared statement 
            $sth = $db->prepare("
                SELECT FirstName, LastName, FacultyId 
                FROM Test.Faculty 
                WHERE UPPER(FirstName) LIKE UPPER(?)
            ");
            $sth->execute(array($name . '%'));
            // set the results (array of objects) as your JSON response
            $data['faculties'] = $sth->fetchAll(PDO::FETCH_OBJ);
        } catch(PDOException $e){
            echo $e->getMessage();
        }
        // send the results i.e. response
        header('Content-Type: application/json');
        echo json_encode($data);
        exit;
    }

1. 我以前从未使用过自动完成插件，但我会根据我看到的其他答案来尝试一下。

   $('#faculty_id').autocomplete({
       source: function (request, response) {
           // short syntax for .ajax() using GET method that expects a JSON response
           $.getJSON('Form.php', { type: 'faculty_id', name: request.term }, function (data) {
               // data.faculties (your AJAX script's response) should now be an array of objects
               console.log(data.faculties);
               response($.map(data.faculties, function (faculty) {
                   console.log(faculty);
                   return {
                       label: faculty.FirstName + ' ' + faculty.LastName,
                       value: faculty.FacultyId
                   }
               }));
           });
       },
       autoFocus: true,
       minLength: 1,
   });
   

2. 最后，当你插入

   // check if form was POSTed
   if ($_SERVER['REQUEST_METHOD'] === 'POST') {
       $faculty_id = $_POST['faculty_id'];
       try {
           // VALUES not VALUE
           // don't wrap your placeholders with quotes in your prepared statement
           // simplified
           $sth = $db->prepare("INSERT INTO ATCTest.Schedule(Faculty) VALUES(?)");
           // simplified way to bind parameters
           $sth->execute(array($faculty_id));
           // use rowCount() not execute() to determine if the operation was successful or not
           if ($sth->rowCount()){
               echo "<h5>Faculty-js: $faculty_id</h5>";
           } else {
               echo "Problem!!!";
           }
       } catch (PDOException $e) {
           echo $e->getMessage();
       }
   }