Apply publish/subscribe for OrderArticle#update

app/views/finance/balancing/new.html.haml

@@ -1,3 +1,18 @@
+- content_for :javascript do
+  :javascript
+    $(function() {
+      // Subscribe to database changes.
+      // See publish/subscribe design pattern in /doc.
+      $(document).on('OrderArticle#update', function(e) {
+        $.ajax({
+          url: '#{new_on_order_article_update_finance_order_path(@order)}',
+          type: 'get',
+          data: {order_article_id: e.order_article_id},
+          contentType: 'application/json; charset=UTF-8'
+        });
+      });
+    });
+
 - title t('.title', name: @order.name)
 
 - content_for :sidebar do

app/views/finance/balancing/new_on_order_article_update.js.erb

@@ -0,0 +1,14 @@
+// Handle more advanced DOM update after AJAX database manipulation.
+// See publish/subscribe design pattern in /doc.
+(function(w) {
+  $('#order_article_<%= @order_article.id %>').html(
+    '<%= j render('finance/balancing/order_article', order_article: @order_article) %>'
+  );
+  
+  $('#group_order_articles_<%= @order_article.id %>').html(
+    '<%= j render('finance/balancing/group_order_articles', order_article: @order_article) %>'
+  );
+  
+  $('#summaryChangedWarning').show();
+})(window);
+