How to update the table using the select option in php and mysql

Question

I want to use the select option to update the table. these are the code and when I try it, no data have been display to table..Help me pls....

these code are for select option.

 <form method="POST"> <text class="sort"><span>Course:</span></text> <select class="sel" name="select_course" id="select_course"> <?php $query=mysqli_query($conn,"select DISTINCT Course from `tbl_student`"); while($row=mysqli_fetch_array($query)){ ?> <option><?php echo $row['Course'];?></option> <?php } ?> </select> <input class="btnsearch" type="button" name="submit" value="Search"> <input class="btn" type="button" name="btn_add" value="Add Student"> <input class="btn_import" type="button" name="import" value="Import File"> 

And these code are for displaying data to table.

  <?php echo '<table> <tr> <td>name</td> <td>Id number</td> <td>Course</td> <td>School Year</td> <td>Semester</td> </tr>'; if(isset($_POST['submit'])) { $result2 = mysqli_query($conn, "Select name,id_number,Course,school_year,semester from tbl_student where Course='".$_POST['select_course']."'"); while($row=mysqli_fetch_row($result2)){ echo '<tr> <td>'.$row["name"].'</td> <td>'.$row["id_number"].'</td> <td>'.$row["Course"].'</td> <td>'.$row["school_year"].'</td> <td>'.$row["semester"].'</td> </tr>'; } echo '</table>'; } ?> </form> 

All i want is when I choose from the select option the table will be updated automatically.

Answer 1

The best way to do this is ajax but js is not tagged here, so you can do it with html and php like:

<form action="updateData.php">
  <select name="select_course" onchange="this.form.submit()">

onchange="this.form.submit()" will submit the form when selection changed to updateData.php , put the code to update the data in table here.

Answer 2

while($row=mysqli_fetch_row($result2)){ 

here is error in your code . you are using mysqli_fetch_row and in blow line you are using $row["name"] . just use mysqli_fetch_assoc then use $row["name"] . if you will use mysqli_fetch_row then you have to put index of data in database