Eliminate event attribute from advanced search.

themes/bootstrap3/templates/search/advanced/layout.phtml

@@ -86,7 +86,7 @@
       </div>
       <span id="groupPlaceHolder" class="hidden">
         <i class="fa fa-plus-circle" aria-hidden="true"></i>
-        <a href="#" onClick="addGroup();return false" role="button"><?= $this->transEsc('add_search_group') ?></a>
+        <a href="#" role="button"><?= $this->transEsc('add_search_group') ?></a>
       </span>
       <?php /* fallback to a fixed set of search groups/fields if JavaScript is turned off */ ?>
       <div class="no-js">
@@ -185,3 +185,12 @@
     </div>
   </form>
 </div>
+<?php
+$script = <<<JS
+$('#groupPlaceHolder a').click(function(e) {
+  addGroup();
+  return false;
+})
+JS;
+?>
+<?=$this->inlineScript(\Laminas\View\Helper\HeadScript::SCRIPT, $script, 'SET');