diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index 5638d95a3a9..a17d43a0b5b 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -2959,7 +2959,7 @@ instance.web.form.FieldMany2One = instance.web.form.AbstractField.extend(instanc
                     title: _t("Open: ") + self.string
                 }
             );
-            pop.on_write_completed.add_last(function() {
+            pop.on('on_write_complete', self, function(){
                 self.display_value = {};
                 self.render_value();
                 self.focus();
@@ -4108,9 +4108,7 @@ instance.web.form.Many2ManyListView = instance.web.ListView.extend(/** @lends in
             title: _t("Open: ") + this.m2m_field.string,
             readonly: this.getParent().get("effective_readonly")
         });
-        pop.on_write_completed.add_last(function() {
-            self.reload_content();
-        });
+        pop.on('on_write_complete', self, self.reload_content);
     }
 });
 
@@ -4357,7 +4355,9 @@ instance.web.form.AbstractFormPopup = instance.web.Widget.extend({
         };
         this.dataset.write_function = function(id, data, options, sup) {
             var fct = self.options.write_function || sup;
-            return fct.call(this, id, data, options).then(self.on_write_completed);
+            return fct.call(this, id, data, options).then(function() {
+                self.trigger('on_write_complete');
+            });
         };
         this.dataset.parent_view = this.options.parent_view;
         this.dataset.child_name = this.options.child_name;
@@ -4377,7 +4377,6 @@ instance.web.form.AbstractFormPopup = instance.web.Widget.extend({
         this.$buttonpane = dialog.$el.dialog("widget").find(".ui-dialog-buttonpane").html("");
         this.start();
     },
-    on_write_completed: function() {},
     setup_form_view: function() {
         var self = this;
         if (this.row_id) {
diff --git a/addons/web_gantt/static/src/js/gantt.js b/addons/web_gantt/static/src/js/gantt.js
index 00e057258f1..0d600712d4a 100644
--- a/addons/web_gantt/static/src/js/gantt.js
+++ b/addons/web_gantt/static/src/js/gantt.js
@@ -211,9 +211,7 @@ instance.web_gantt.GanttView = instance.web.View.extend({
     on_task_display: function(task) {
         var self = this;
         var pop = new instance.web.form.FormOpenPopup(self);
-        pop.on_write_completed.add_last(function() {
-            self.reload();
-        });
+        pop.on('on_write_complete',self,self.reload);
         pop.show_element(
             self.dataset.model,
             task.id,