Adding another dropdown list to a form with jQuery

Question

I'm trying to add another dropdown list to a form once an option is selected in the first dropdown.

So below is part of the form. When the dropdown with the name is selected, in this case there are 3 classes, EDMATH 502, EDTECH 401, Math 101, I want different image IDs to appear in the next dropdown ("image_os_image_id"). The idea being that each class has access to different images.

I know this is a job for jquery, but I am having a heck of a time figuring out how to do that. I have searched quite a bit, but am stymied a bit by either poor searching or the fact that I always seem to come up with hits for adding another option to a list, not adding another list.

<div class="control-group">
    <label class="control-label" for="select01">Class</label>
    <div class="controls">
        <select id="select01" name="class_name">
            <option value='EDMATH 502'>EDMATH 502</option>
            <option value='EDTECH 401'>EDTECH 401</option>
            <option value='Math 101'>Math 101</option>
        </select>
    </div>
    <!-- class -->
</div>
<div class="control-group" </div>
    <label class="control-label" for="select01">Image</label>
    <div class="controls">
        <select id="select01" name="image_os_image_id">
            <option value='647abf63-fd95-42a7-a744-e1885f8d5c16'>photoshop</option>
            <option value='0f53de4a-1bb6-43bd-a567-fe181b25cfbe'>matlab</option>
            <option value='647abf63-fd95-42a7-a744-e1885f8d5c16'>photoshop</option>
            <option value='0f53de4a-1bb6-43bd-a567-fe181b25cfbe'>matlab</option>
        </select>
    </div>
    <!-- image -->
</div>
<!-- control group -->

Thanks for any help!

Answer 1

1. Hi first change your second select id from 'select01' to 'select02' - ids should be unique
2. include jquery

3. add the script

       $(document).ready(function(){
           $('#select01').bind('change', function(){
   
               $('#select02 option').remove();
   
               switch($(this).val()) {
               case 'EDMATH 502':
                   $('#select02').append('<option value="647abf63-fd95-42a7-a744-e1885f8d5c16">photoshop</option>');
                   $('#select02').append('<option value="0f53de4a-1bb6-43bd-a567-fe181b25cfbe">matlab</option>');
                   $('#select02').append('<option value="647abf63-fd95-42a7-a744-e1885f8d5c16">photoshop</option>');
                   $('#select02').append('<option value="0f53de4a-1bb6-43bd-a567-fe181b25cfbe">matlab</option>');
                   break;
               case 'EDTECH 401':
                   $('#select02').append('<option value="test1">test1</option>');
                   $('#select02').append('<option value="test2">test11</option>');
                   break;
               case 'Math 101':
                   $('#select02').append('<option value="test2">test2</option>');
                   $('#select02').append('<option value="test22">test22</option>');
                   break;
               }
   
   
   
           })
       });