javascript - Get selected option value which is dynamically generated in a nested loop -


here function working on. need selected option inside while loop. every time trying selected value through select id, it's getting last selected value rest of row.

please me. how can , store full table data. 

function generate_schedule($con,$sy,$year_id){      $time = array(1=>'9:30-11:00',2=>'11:30-1:00',3=>'1:30-3:00',4=>'3:15-4:45');     $days = array(1=>'sunday',2=>'monday',3=>'tuesday',4=>'wednesday',5=>'thursday',6=>'friday',7=>'saturday');     $rooms=array(1=>'302',2=>'303',3=>'304',4=>'701',5=>'702',6=>'704',7=>'901',8=>'902',9=>'1402',10=>'1405');     // $yls = mysqli_query($con,"select * year_level_subject year_id='$year_id'");     $yls=mysqli_query($con,"select * year_level_subject yls join subjects s on yls.subj_id=s.subj_id yls.year_id='$year_id'");     $num=mysqli_num_rows($yls);     $x = 0;     echo '<table class="table table-bordered table-hover" id=" datatable">';     echo '<thead>           <tr>           <th>time</th>           <th>days</th>           <th>subject</th>           <th>teacher</th>           <th>room</th>           </tr>           </thead>';     while($row=mysqli_fetch_assoc($yls)){             extract($row);             echo '<tr>';             echo '<td><select id ="seltime" ><option value=0>select time</option>';             foreach($time $key => $value) {             echo '<option value='.$key.'>';             echo $value .'</option>';             }             echo '</select></td>';             echo '<td><select class="selday" ><option value=0>select day</option>';             foreach($days $key => $value) {             echo '<option value='.$key.'>';             echo $value .'</option>';             }             echo '</select></td>';             echo '<td>'.$subj_desc.'</td>';             $teach = mysqli_query($con,"select * teachers");         echo '<td><select id="selteacher" onchange="schedata(this)"  >               <option value=0>select teacher</option>';         while($row=mysqli_fetch_assoc($teach)){             extract($row);             echo '<option value='.$teach_id.'>'.$teach_fname.' '.$teach_mname.' '.$teach_lname.'</option>';         }         echo '</select></td>';             echo '</select></td>';             echo '<td><select name ="selroom" ><option value=0>select room</option>';             foreach($rooms $key => $value) {             echo '<option value='.$key.'>';             echo $value .'</option>';             }             echo '</select></td>';          echo '</tr>';     }     echo '</table>';}

you did't give name atribute select element

 echo '<td><select id="selteacher" onchange="schedata(this)"  >

give name as

 echo '<td><select id="selteacher" name="selteacher" onchange="schedata(this)"  >

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