CIP #57952 improve add loading submodal js

public/opac/js/subModal.js

@@ -10,11 +10,12 @@
         event.preventDefault();
         current_anchor=$(this);
         addLoadingClass();
-	      var url = $(this).attr('data-url')
-	        ? $(this).attr('data-url')
-	        : $(this).attr('href');
+	var url = $(this).attr('data-url')
+	    ? $(this).attr('data-url')
+	    : $(this).attr('href');
         opacDialogFromUrl(addPath(url, '/render/popup'));
       });
+    current_anchor = undefined;
   }