how to retain drop down values as the value selected after submit

manpreet Best Answer 3 years ago

My drop down is showing blank then when i select the value of dropdown the same value is showing, but i have to show dropdown value as select first then when I click on button the respective value should show

I am doing a Php program

php $_PHP_SELF?>">
                                                     for="courseDisp" class="col-sm-2" style="margin-top:10px;">Course : 

                                                            php
                                                            $course="SELECT * from course";
                                                            $res= $conn->query($course);
                                                            if($res->num_rows>0)
                                                            {
                                                                echo '';
                                                                echo 'value="0" selected> -- SELECT --'; 
                                                                while($row=$res->fetch_assoc())
                                                                {
                                                                echo 'value='.$row["course_id"].'>'.$row['shortname'].'';
                                                                }
                                                                echo '';
                                                            } else {
                                                            echo "0 result";
                                                        }

                                                            ?>

                                                      

                                                     for="yearDisp" class="col-sm-2" style="margin-top:10px;">Year : 


                                                    php
                                                            $year="SELECT distinct(year) from syllabus";
                                                            $res= $conn->query($year);
                                                            if($res->num_rows>0)
                                                            {
                                                                echo '';
                                                                echo 'value="0">-- SELECT --';
                                                                while($row=$res->fetch_assoc())
                                                                {
                                                                echo 'value='.$row["year"].'>'.$row['year'].'';
                                                                }
                                                                echo '';
                                                            } else {
                                                            echo "0 result";
                                                        }


                                                            ?>
<script type="text/javascript"> 

document.getElementById('courseDisp').value = "php echo $_POST['courseDisp'];?>";     
document.getElementById('yearDisp').value = "php echo $_POST['yearDisp'];?>"; 

                                                     

                                                    <input type="submit" class="btn col-sm-2" style="margin-left:15px;margin-top:10px;width:60px;font-weight:bold;font-size:15px;" value="GO" name="btnGo" id="btnGo" />

                                                form>