diff --git a/kfet/static/kfet/js/history.js b/kfet/static/kfet/js/history.js
index 5fcb8f2c..a41173b2 100644
--- a/kfet/static/kfet/js/history.js
+++ b/kfet/static/kfet/js/history.js
@@ -4,7 +4,7 @@ class KHistory {
         return { from: moment().subtract(1, 'days').format('YYYY-MM-DD HH:mm:ss'), };
     }
     
-    constructor(display_options, noselect) {
+    constructor(options) {
         this.templates = {
             'purchase': '<div class="ope"><span class="amount"></span><span class="infos1"></span><span class="infos2"></span><span class="addcost"></span><span class="canceled"></span></div>',
             'specialope': '<div class="ope"><span class="amount"></span><span class="infos1"></span><span class="infos2"></span><span class="addcost"></span><span class="canceled"></span></div>',
@@ -19,12 +19,12 @@ class KHistory {
         
         this.list = new OperationList();
 
-        this.display_options = display_options || {};
-
-        if (!noselect) {
+        if (!options.no_select)
             this.selection = new KHistorySelection(this);
-        }
 
+        if (options.no_trigramme) 
+            this.templates['opegroup'] = '<div class="opegroup"><span class="time"></span><span class="amount"></span><span class="valid_by"></span><span class="comment"></span></div>'
+ 
         this._init_events();
     }
 
@@ -43,7 +43,7 @@ class KHistory {
     }
 
     display() {
-        this.list.display(this._$container, this.templates, this.display_options);
+        this.list.display(this._$container, this.templates, {});
         var nb_opes = this._$container.find('.ope[canceled="false"]').length;
         $('#nb_opes').text(nb_opes);
     }
diff --git a/kfet/static/kfet/js/kfet.api.js b/kfet/static/kfet/js/kfet.api.js
index ee5376af..10e52989 100644
--- a/kfet/static/kfet/js/kfet.api.js
+++ b/kfet/static/kfet/js/kfet.api.js
@@ -1230,9 +1230,6 @@ class Formatter {
         var props = options.override_props ? options.props : this.props.concat(options.props);
         var attrs = options.override_attrs ? options.attrs : this.attrs.concat(options.attrs);
 
-        props = options.remove_props ? props.diff(options.remove_props) : props;
-        attrs = options.remove_attrs ? props.diff(options.remove_attrs) : attrs;
-
         var prefix_prop = options.prefix_prop !== undefined ? options.prefix_prop : '.';
         var prefix_attr = options.prefix_attr !== undefined ? options.prefix_attr : '';
 
diff --git a/kfet/static/kfet/js/kfet.js b/kfet/static/kfet/js/kfet.js
index d9e2624c..d8799b1d 100644
--- a/kfet/static/kfet/js/kfet.js
+++ b/kfet/static/kfet/js/kfet.js
@@ -24,22 +24,6 @@ String.prototype.isValidTri = function() {
     return pattern.test(this);
 }
 
-/**
- * Array method
- * @global
- * @return {[]} Array elements not in given argument
- */
-// Note : we define it this way to avoid problems in for loops
-Object.defineProperty(Array.prototype, 'diff', {
-    enumerable: false,
-    configurable: true,
-    value: function(a) {
-        return this.filter(function (elt) {
-            return a.indexOf(elt) < 0 ;
-        });
-    }
-});
-
 
 /**
  * Checks if given argument is float ;
diff --git a/kfet/templates/kfet/account_read.html b/kfet/templates/kfet/account_read.html
index 206b40ce..86e1b43e 100644
--- a/kfet/templates/kfet/account_read.html
+++ b/kfet/templates/kfet/account_read.html
@@ -102,7 +102,7 @@
 $(document).ready(function() {
     'use strict';
 
-    var khistory = new KHistory({'remove_props': ['trigramme']});
+    var khistory = new KHistory({'no_trigramme': true});
 
     // -----
     // Synchronization