no mark_lotw if no station is selected

application/views/adif/import.php

@@ -215,7 +215,7 @@
                         <label for="to"><?php echo lang('gen_to_date') . ": " ?></label>
                         <input name="to" id="to" type="date" class="form-control w-auto">
                         <br>
-                        <button type="submit" class="btn btn-sm btn-primary" value="Export"><?php echo lang('adif_mark_qso_as_exported_to_lotw') ?></button>
+                        <button type="button" class="btn btn-sm btn-primary" id="markExportedToLotw" value="Export"><?php echo lang('adif_mark_qso_as_exported_to_lotw') ?></button>
                     </form>
                 </div>
                 <div class="tab-pane <?php if ($showtab == 'dcl') {

application/views/interface_assets/footer.php

@@ -104,6 +104,10 @@ function load_was_map() {
     <script src="<?php echo base_url() ;?>assets/js/sections/maintenance.js"></script>
 <?php } ?>
 
+<?php if ($this->uri->segment(1) == "adif" ) { ?>
+    <script src="<?php echo base_url() ;?>assets/js/sections/adif.js"></script>
+<?php } ?>
+
 <?php if ($this->uri->segment(1) == "notes" && ($this->uri->segment(2) == "add" || $this->uri->segment(2) == "edit") ) { ?>
     <!-- Javascript used for Notes Area -->
     <script src="<?php echo base_url() ;?>assets/plugins/quill/quill.min.js"></script>

assets/js/sections/adif.js

@@ -0,0 +1,11 @@
+$(document).ready(function(){
+	$('#markExportedToLotw').click(function(e){
+		let form = $(this).closest('form');
+		let station = form.find('select[name=station_profile]');
+		if (station.val() == 0) {
+			station.addClass('is-invalid');
+		}else{
+			form.submit();
+		}
+	})
+});