Not working cascading dropdown with onchange method

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if i use only cascading DropDown list then its proper work... i want to show and hide div id depend upon list item of dropdown control... i do this task with onchange method but not working... but its work without cascading....

What I have tried:

       function CourseFun() {

           debugger

           var DropdownList = document.getElementById('&lt;%=course.ClientID %>');

           var SelectedIndex = DropdownList.selectedIndex;
           var divEQ = document.getElementById('divEQ')
           var divtenper = document.getElementById('divtenper');
           var divyear10 = document.getElementById('divyear10');
           var divpertwelth = document.getElementById('divpertwelth');
           var divyearof12 = document.getElementById('divyearof12');
           var divgraper = document.getElementById('divgraper');
           var divyearofgra = document.getElementById('divyearofgra');

           if (SelectedIndex == 1) {
               divEQ.style.display = "block";
               divpertwelth.style.display = "block";
               divyearof12.style.display = "block";
               divgraper.style.display = "none";
               divyearofgra.style.display = "none";
               divyear10.style.display = "block";
               divtenper.style.display = "block";
           }
           else if (SelectedIndex == 3) {
               divEQ.style.display = "block";
               divpertwelth.style.display = "block";
               divyearof12.style.display = "block";
               divyear10.style.display = "block";
               divtenper.style.display = "block";
               divgraper.style.display = "none";
               divyearofgra.style.display = "none";
           }
           else if (SelectedIndex == 2) {
               divEQ.style.display = "block";
               divyearofgra.style.display = "block";
               divpertwelth.style.display = "block";
               divyearof12.style.display = "block";
               divyear10.style.display = "block";
               divtenper.style.display = "block";
               divgraper.style.display = "block";

           }

       }




<asp:DropDownList ID="course" runat="server"  class="slectbig" AutoPostBack="true" OnSelectedIndexChanged="course_SelectedIndexChanged" onChange="CourseFun()" >
    <asp:ListItem Value="0"> Select course

Posted 13-Mar-18 0:41am

Member 13718689

Updated 13-Mar-18 3:51am

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Richard Deeming · Answer 1 · 2018-03-13T03:52:00

Solution 1

Setting AutoPostBack="true" means that the page will post back to the server as soon as you change the selected item.

The CourseFun function might run, but any changes it makes will be discarded.

You need to trigger the CourseFun function when the page loads instead.

Posted 13-Mar-18 3:52am

Richard Deeming