I'm using codeigniter to create my php web site in my view page I need to set visible when the drop-down value change how can i do that?
this the button that i need visible and hidden when drop-down change

dropdown
Code:
 <div class="form-group">
         <label for="lastname" class="control-label">Your Packages</label>
           <?php if(isset($tourbuddy_packages)){?>
...