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    <p>Assume that you have a select box that lists all the academies available:</p> <pre><code>&lt;select name="academy" id="acadaemy"&gt; &lt;option value="1"&gt;Academy1&lt;/option&gt; ............................. ............................. &lt;option value="15"&gt;Academy15&lt;/option&gt; &lt;/select&gt; </code></pre> <p>Then you can bind an onchange event for this select to display the desired courses.</p> <pre><code> $('#acadaemy').on('change', function() { var option = this.value; $.ajax({ type: "POST", url: "getCourses.php", data: { 'ac_id': option }, success: function (data) { $('#course_catalog').html(data); } }); }); </code></pre> <p>And in ur getCourses.php</p> <pre><code>Step 1: fetch the POST value (here $_POST['ac_id']) and validate it Step 2: Get all courses. Step 3: Get all courses with specified academy id Step 4: Iterate result from step 3 and create each select tag. Step 5: Iterate result from Step 2 and create option tags and set selected. Step 6: Echo back the result. &lt;?php $id = $_POST['ac_id']; //Do something here to validate the post data $course_query = $db_con-&gt;prepare("SELECT course_id, course_name FROM courses_selection_list;"); $course_query-&gt;execute(); $data = $course_query-&gt;fetchAll();//All courses here $db_select = $db_con-&gt;prepare(" SELECT academy_id, course_name, course_id, course_start_date, course_end_date FROM courses_by_academy WHERE academy_id = :id "); $resultStr = ''; if (!$db_select) return false; if (!$db_select-&gt;execute(array(':id' =&gt; $id))) return false; $results = $db_select-&gt;fetchAll(\PDO::FETCH_ASSOC); // academy specific courses here if (empty($results)) return false; foreach ($results as $value) { // iterate academy courses $resultStr .= '&lt;div class="course"&gt;'; $resultStr .= '&lt;select name="coursename[]" class="course_list"&gt;'; foreach ($data as $row){ // iterate all courses $result .= "&lt;option value='".$row["course_id"].":".$row["course_name"]."'"; if ($result['course_id'] == $row['course_id']) { $resultStr .= " selected='selected'"; } $resultStr .= "&gt;". $row['course_name'] ."&lt;/option&gt;"; } $resultStr .= '&lt;/select&gt;'; $resultStr .= '&lt;/div&gt;'; } echo $resultStr; exit(); ?&gt; </code></pre>
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