[英]Add COUNT in Javascript alert box
此頁面是用戶將 select 學期和課程的位置,然后將在所選課程上提示警報框,如下圖所示。
Javascript
<script type="text/javascript">
$(document).ready(function(){
$("#prg").change(function(){
var selectedcount = $('#prg option:selected').data('count');
alert ("The next intake for " +selectedcount + " will have " + "students");
}); </script>
身體
<div class="modal-body">
<div class="form-group">
<label for="title">Select Current Semester:</label>
<select name="semester" class="form-control">
<option value="">--- Select Current Semester ---</option>
<?php
require('../setting/config.php');
$query = "SELECT DISTINCT semester FROM marketing_data ORDER BY semester DESC";
$do = mysqli_query($conn, $query);
while($row = mysqli_fetch_array($do)){
echo '<option value="'.$row['student_matric'].'">'.$row['semester'].'</option>';
}
?>
</select>
</div>
<div class="form-group">
<label for="title">Select Programme:</label>
<select id="prg" name="prg" class="form-control">
<option value="">--- Select Programme ---</option>
<?php
$query2 = "SELECT student_prg, COUNT(student_prg) as count FROM marketing_data GROUP BY student_prg ORDER BY student_prg DESC";
$do = mysqli_query($conn, $query2);
while($row = mysqli_fetch_array($do)){
echo '<option value="'.$row['student_matric'].' data-count="'.$row['count'].'">'.$row['student_prg'].'</option>';
}
?>
</select>
我希望警報框也可以添加學生人數。 例如:*多媒體工業(榮譽)學士的下屆招生將有36名學生*
您能否協助添加計數查詢的位置和方式,以便它顯示在我提到的警報框中。
數據庫
mysql> describe marketing_data;
+---------------+------------------+------+-----+---------+--------------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+------------------+------+-----+---------+--------------------+
| student_matric| varchar(10) unsigned | NO | PRI | NULL | auto_increment |
| student_prg | text unsigned | YES | | NULL | |
| semester | varchar(10) | YES | | NULL | |
| intake_year | int(10) | YES | | NULL | |
| student_city | text | YES | | NULL | |
| city_lat | varchar(20) | YES | | NULL | |
| city_long | varchar(20) | YES | | NULL | |
| student_state | text | YES | | NULL | |
| state_code | varchar(100) | YES | | NULL | |
+---------------+------------------+------+-----+---------+--------------------+
您可以使用如下查詢返回每條記錄的計數:
SELECT student_prg, COUNT(student_prg) as count FROM marketing_data GROUP BY student_prg ORDER BY student_prg DESC
您的結果現在將計算每個student_prg
值的數量。
然后我可能會將計數添加為您正在編寫的選項的數據屬性:
echo '<option value="'.$row['student_prg'].' data-count="'.$row['count'].'">'.$row['student_prg'].'</option>';
然后您可以 select 新選擇的選項中的值。
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