如果數據庫中存在記錄，則填充並鎖定下拉列表
[英]Filling and locking drop-downs if record in database exists
問題描述
我目前有一個數據庫，其中充滿了學生選擇的體育項目。 我有一個名為studentChoices.php的頁面，該頁面允許學生選擇他們的運動選擇。 如果數據庫中有一條記錄具有其用戶ID，那么我將如何使用其運動選項填充頁面中的下拉菜單，禁用它們並隱藏“提交”按鈕？
<body>
<div class='container col-md-8 rounded p-5 mt-5 border'>
<h2 class='text-center'>Oundle School Sports Database</h2>
<h4 class='pt-4'><?php echo 'Welcome: '.$_SESSION['name'] ?></h4>
<h5 class='pt-2'>Please fill all forms</h5>
<form action="postChoice.php" method ="post">
<div class='py-2 row'>
<div class='col-md-4'>
<select name="term1sport" class='custom-select'>
<option value=" " selected disabled>Please select a first term sport...</option>
<?php
include_once('connection.php');
try{
$stmt = $conn->prepare(
"SELECT DISTINCT c.Choice_ID, s.Name
From Sports AS s INNER JOIN Choices As c
ON c.Sport_ID = s.Sport_ID INNER JOIN Year As y
ON y.Year_ID = c.Year_ID
Where y.Code Like CONCAT('%', :year, '%') AND
c.Current = 'Y' AND
c.Sex IN (:sex, 'B') AND
c.Term_ID = 1 ORDER BY Name ASC");
$stmt->bindParam(':year', $_SESSION['year']);
$stmt->bindParam(':sex', $_SESSION['sex']);
$stmt->execute();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC))
{
echo("<option value='".$row['Choice_ID']."'>".$row['Name']."</option>");
}
}
catch(PDOException $e)
{
echo "error".$e->getMessage();
}
?>
</select>
</div>
<div class='col-md-4'>
<select name="term2sport" class='custom-select'>
<option value=" " selected disabled>Please select a second term sport...</option>
<?php
include_once('connection.php');
try{
$stmt = $conn->prepare(
"SELECT DISTINCT c.Choice_ID, s.Name
From Sports AS s INNER JOIN Choices AS c
ON c.Sport_ID = s.Sport_ID INNER JOIN Year AS y
ON y.Year_ID = c.Year_ID
Where y.Code Like CONCAT('%', :year, '%') AND
c.Current = 'Y' AND
c.Sex IN (:sex, 'B') AND
c.Term_ID = 2 ORDER BY Name ASC");
$stmt->bindParam(':year', $_SESSION['year']);
$stmt->bindParam(':sex', $_SESSION['sex']);
$stmt->execute();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC))
{
echo("<option value='".$row['Choice_ID']."'>".$row['Name']."</option>");
}
}
catch(PDOException $e)
{
echo "error".$e->getMessage();
}
?>
</select>
</div>
<div class='col-md-4'>
<select name="term3sport" class='custom-select'>
<option value=" " selected disabled>Please select a third term sport...</option>
<?php
include_once('connection.php');
try{
$stmt = $conn->prepare(
"SELECT DISTINCT c.Choice_ID, s.Name
From Sports AS s INNER JOIN Choices As c
ON c.Sport_ID = s.Sport_ID INNER JOIN Year As y
ON y.Year_ID = c.Year_ID
Where y.Code Like CONCAT('%', :year, '%') AND
c.Current = 'Y' AND
c.Sex IN (:sex, 'B') AND
c.Term_ID = 3 ORDER BY Name ASC");
$stmt->bindParam(':year', $_SESSION['year']);
$stmt->bindParam(':sex', $_SESSION['sex']);
$stmt->execute();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC))
{
echo("<option value='".$row['Choice_ID']."'>".$row['Name']."</option>");
}
}
catch(PDOException $e)
{
echo "error".$e->getMessage();
}
?>
</select>
</div>
</div>
<div class='py-2 row'>
<div class='col-md-12'>
<input class='btn btn-success float-right'type="submit" value="Submit Choices">
</div>
</div>
</form>
1 個解決方案
解決方案1
0 已采納 2018-11-15 22:46:10
利用注釋的幫助，我在數據庫中查找了用戶並計算了記錄數。 如果數字更大，那么我會為下拉菜單查找運動的值。 然后，我使用javascript更新了它們並禁用了它們。 可能不是最好的代碼，但是它可以工作。
<?php ini_set('display_errors', 1); ini_set('display_startup_errors', 1); error_reporting(E_ALL); include_once('connection.php'); if($_SERVER['REQUEST_METHOD'] == "POST" and isset($_POST['someAction'])) { func(); } function func() { $conn = mysqli_connect("localhost", "root", "", "SportsDB"); } session_start(); if( !isset($_SESSION['username']) ){ header('Location:login.php'); } print_r($_SESSION); ?> <!DOCTYPE html> <html> <title>Choices</title> <!--- Link to CDN for Bootstrap 4, jQuery and DataTables --> <link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/bs4-4.1.1/jq-3.3.1/jszip-2.5.0/dt-1.10.18/af-2.3.2/b-1.5.4/b-colvis-1.5.4/b-flash-1.5.4/b-html5-1.5.4/b-print-1.5.4/cr-1.5.0/fc-3.2.5/fh-3.1.4/kt-2.5.0/r-2.2.2/rg-1.1.0/rr-1.2.4/sc-1.5.0/sl-1.2.6/datatables.min.css" /> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/pdfmake.min.js"></script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/vfs_fonts.js"></script> <script type="text/javascript" src="https://cdn.datatables.net/v/bs4-4.1.1/jq-3.3.1/jszip-2.5.0/dt-1.10.18/af-2.3.2/b-1.5.4/b-colvis-1.5.4/b-flash-1.5.4/b-html5-1.5.4/b-print-1.5.4/cr-1.5.0/fc-3.2.5/fh-3.1.4/kt-2.5.0/r-2.2.2/rg-1.1.0/rr-1.2.4/sc-1.5.0/sl-1.2.6/datatables.min.js"></script> <link rel="stylesheet" type="text/css" href="css/stylesheet.css" /> <body> <div class='container col-md-8 rounded p-5 mt-5 border'> <h2 class='text-center'>Oundle School Sports Database</h2> <h4 class='pt-4'> <?php echo 'Welcome: '.$_SESSION['name'] ?> </h4> <h5 class='pt-2'>Please fill all forms</h5> <form action="postChoice.php" method="post"> <div class='py-2 row'> <div class='col-md-4'> <select name="term1sport" id='select1' class='custom-select'> <option value=" " selected disabled>Please select a first term sport...</option> <?php try{ $stmt = $conn->prepare( "SELECT DISTINCT c.Choice_ID, s.Name From Sports AS s INNER JOIN Choices As c ON c.Sport_ID = s.Sport_ID INNER JOIN Year As y ON y.Year_ID = c.Year_ID Where y.Code Like CONCAT('%', :year, '%') AND c.Current = 'Y' AND c.Sex IN (:sex, 'B') AND c.Term_ID = 1 ORDER BY Name ASC"); $stmt->bindParam(':year', $_SESSION['year']); $stmt->bindParam(':sex', $_SESSION['sex']); $stmt->execute(); while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { echo(" <option value='".$row['Choice_ID']."'>".$row['Name']."</option>"); } } catch(PDOException $e) { echo "error".$e->getMessage(); } ?> </select> </div> <div class='col-md-4'> <select name="term2sport" id='select2' class='custom-select'> <option value=" " selected disabled>Please select a second term sport...</option> <?php try{ $stmt = $conn->prepare( "SELECT DISTINCT c.Choice_ID, s.Name From Sports AS s INNER JOIN Choices AS c ON c.Sport_ID = s.Sport_ID INNER JOIN Year AS y ON y.Year_ID = c.Year_ID Where y.Code Like CONCAT('%', :year, '%') AND c.Current = 'Y' AND c.Sex IN (:sex, 'B') AND c.Term_ID = 2 ORDER BY Name ASC"); $stmt->bindParam(':year', $_SESSION['year']); $stmt->bindParam(':sex', $_SESSION['sex']); $stmt->execute(); while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { echo(" <option value='".$row['Choice_ID']."'>".$row['Name']."</option>"); } } catch(PDOException $e) { echo "error".$e->getMessage(); } ?> </select> </div> <div class='col-md-4'> <select name="term3sport" id='select3' class='custom-select'> <option value=" " selected disabled>Please select a third term sport...</option> <?php try{ $stmt = $conn->prepare( "SELECT DISTINCT c.Choice_ID, s.Name From Sports AS s INNER JOIN Choices As c ON c.Sport_ID = s.Sport_ID INNER JOIN Year As y ON y.Year_ID = c.Year_ID Where y.Code Like CONCAT('%', :year, '%') AND c.Current = 'Y' AND c.Sex IN (:sex, 'B') AND c.Term_ID = 3 ORDER BY Name ASC"); $stmt->bindParam(':year', $_SESSION['year']); $stmt->bindParam(':sex', $_SESSION['sex']); $stmt->execute(); while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { echo(" <option value='".$row['Choice_ID']."'>".$row['Name']."</option>"); } } catch(PDOException $e) { echo "error".$e->getMessage(); } ?> </select> </div> </div> <div class='py-2 row'> <div class='col-md-12'> <input class='btn btn-success float-right' type="submit" value="Submit Choices"> </div> </div> </form> <div class="collapse" id='testid'> <h6>Success</h6> </div> <div> <!-- Circus T1 code --> </div> <div> <!-- Circus T2 code --> </div> <div> <!-- Circus T3 code --> </div> <div> <!-- Rules and stuff go here --> </div> <form action="process.php" method="post" class='col-md-12'> <div class="text-center col-md-12"> <input type="submit" class="btn btn-primary btn-sx" value="Logout"> </div> </form> </div> <?php $stmt=$conn->prepare('SELECT COUNT(1) FROM Student_Choices JOIN Current_DB ON DB_Year = DB WHERE Username = :username'); $stmt->bindParam(':username', $_SESSION['username']); $stmt->execute(); $row=$stmt->fetch(PDO::FETCH_ASSOC); { //Now to check, we use an if() statement if($row['COUNT(1)'] >= 1) { $stmt = $conn->prepare( "SELECT st.Name AS student, st.House AS house, (CASE WHEN st.Year = 6 THEN 'L6' WHEN st.Year = 7 THEN 'U6' ELSE st.Year END) as year, c1.Choice_ID AS T1, c2.Choice_ID AS T2, c3.Choice_ID AS T3 From Students AS st INNER JOIN Student_Choices AS sc ON st.Username = sc.Username INNER JOIN Current_DB AS db ON sc.DB_year = db.DB INNER JOIN Choices AS c1 ON sc.T1_Choice = c1.Choice_ID INNER JOIN Sports AS T1 ON c1.Sport_ID = T1.Sport_ID INNER JOIN Choices AS c2 ON sc.T2_Choice = c2.Choice_ID INNER JOIN Sports AS T2 ON c2.Sport_ID = T2.Sport_ID INNER JOIN Choices AS c3 ON sc.T3_Choice = c3.Choice_ID INNER JOIN Sports AS T3 ON c3.Sport_ID = T3.Sport_ID Where sc.Username = :username "); $stmt->bindParam(':username', $_SESSION['username']); $stmt->execute(); while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { echo ' <script>'; echo 'document.getElementById("select1").value='.$row['T1'].';'; echo 'document.getElementById("select1").disabled=true;'; echo 'document.getElementById("select2").value='.$row['T2'].';'; echo 'document.getElementById("select2").disabled=true;'; echo 'document.getElementById("select3").value='.$row['T3'].';'; echo 'document.getElementById("select3").disabled=true;'; echo '</script>'; } } } ?> </body> </html>
快速自動完成下拉式選單
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