diff --git a/kfet/static/kfet/js/history.js b/kfet/static/kfet/js/history.js
index 6493bb5c..3719042e 100644
--- a/kfet/static/kfet/js/history.js
+++ b/kfet/static/kfet/js/history.js
@@ -1,6 +1,6 @@
 class History {
     
-    constructor() {
+    constructor(api_options, display_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>',
@@ -11,14 +11,12 @@ class History {
         };
 
         this._$container = $('#history');
+        this._$nb_opes = $('#nb_opes');
         
         this.list = new OperationList();
-        this.api_options = {
-            'from': moment().subtract(3, 'days').format('YYYY-MM-DD HH:mm:ss'),
-        };
-
-        this.display_options = {} ;
-        this.lock = 0 ;
+        this.api_options = 
+            api_options || { from: moment().subtract(1, 'days').format('YYYY-MM-DD HH:mm:ss'), };
+        this.display_options = display_options || {};
 
         this._init_selection();
         this._init_events();
@@ -26,6 +24,8 @@ class History {
 
     display() {
         this.list.display(this._$container, this.templates, this.display_options);
+        var nb_opes = this._$container.find('.ope[canceled="false"]').length;
+        $('#nb_opes').text(nb_opes);
     }
 
     reset() {
@@ -70,10 +70,11 @@ class History {
     }
 
     //TODO: permission management in another class ?
+    //TODO: idem for confirmation
     cancel_operations(to_cancel, password='') {
-        if (this.lock == 1)
+        if (lock == 1)
             return false;
-        this.lock = 1;
+        lock = 1;
         var that = this;
 
         if (window.kpsul) {
@@ -100,7 +101,7 @@ class History {
         })
         .done(function(data) {
             on_success();
-            that.lock = 0;
+            lock = 0;
         })
         .fail(function($xhr) {
             var data = $xhr.responseJSON;
@@ -114,7 +115,7 @@ class History {
                     displayErrors(getErrorsHtml(data));
                     break;
             }
-            that.lock = 0;
+            lock = 0;
         });
     }
 
@@ -167,5 +168,8 @@ class History {
                 this.add_node(opegroup);            
             }
         }
+
+        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 8db9b0fe..1b6e40fc 100644
--- a/kfet/static/kfet/js/kfet.api.js
+++ b/kfet/static/kfet/js/kfet.api.js
@@ -1087,12 +1087,17 @@ class APIModelForest extends ModelForest {
 
         api_options['format'] = 'json';
 
-        $.getJSON(this.constructor.url_model, api_options)
-            .done(function(json, textStatus, jqXHR) {
-                that.from(json);
-                on_success(json, textStatus, jqXHR);
-            })
-            .fail(on_error);
+        $.ajax({
+            dataType: "json",
+            url     : this.constructor.url_model, 
+            method  : "POST",
+            data    : api_options,
+        })
+        .done(function(json, textStatus, jqXHR) {
+            that.from(json);
+            on_success(json, textStatus, jqXHR);
+        })
+        .fail(on_error);
     }
 }
 
@@ -1244,6 +1249,9 @@ 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 aa58d1ce..9c5326c7 100644
--- a/kfet/static/kfet/js/kfet.js
+++ b/kfet/static/kfet/js/kfet.js
@@ -24,6 +24,36 @@ 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 ;
+ * if not, parses given argument to float value.
+ * @global
+ * @return {float} 
+ */
+function floatCheck(v) {
+    if (typeof v === 'number')
+        return v;
+    return Number.parseFloat(v);
+}
+
+
 
 $(document).ready(function() {
     $(window).scroll(function() {
diff --git a/kfet/static/kfet/js/kpsul.js b/kfet/static/kfet/js/kpsul.js
index c11e78dc..90ff988e 100644
--- a/kfet/static/kfet/js/kpsul.js
+++ b/kfet/static/kfet/js/kpsul.js
@@ -5,8 +5,7 @@ class KPsulManager {
         this.account_manager = new AccountManager(this);
         this.checkout_manager = new CheckoutManager(this);
         this.article_manager = new ArticleManager(this);
-        this.history = new History(this);
-        this.lock = 0 ;
+        this.history = new History();
     }
 
     reset(soft) {
diff --git a/kfet/templates/kfet/history.html b/kfet/templates/kfet/history.html
index 78f8ddea..64ccf23d 100644
--- a/kfet/templates/kfet/history.html
+++ b/kfet/templates/kfet/history.html
@@ -15,7 +15,9 @@
 <script type="text/javascript" src="{% static 'kfet/js/moment-timezone-with-data-2010-2020.js' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/bootstrap-datetimepicker.min.js' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/multiple-select.js' %}"></script>
+<script type="text/javascript" src="{% url 'js_reverse' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/kfet.js' %}"></script>
+<script type="text/javascript" src="{% static 'kfet/js/kfet.api.js' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/history.js' %}"></script>
 {% endblock %}
 
@@ -61,11 +63,12 @@
 
 <script type="text/javascript">
 $(document).ready(function() {
-    settings = { 'subvention_cof': parseFloat({{ settings.subvention_cof|unlocalize }})}
 
-    lock = 0 ;
+    // Lock to avoid multiple requests
+    window.lock = 0;
 
-    khistory = new KHistory();
+
+    var history = new History();
 
     var $from_date = $('#from_date');
     var $to_date = $('#to_date');
@@ -80,7 +83,9 @@ $(document).ready(function() {
         return selected;
     }
 
-    function getHistory() {
+    function updateHistory() {
+
+        // Get API options
         var data = {};
         if ($from_date.val())
             data['from'] = moment($from_date.val()).format('YYYY-MM-DD HH:mm:ss');
@@ -91,20 +96,10 @@ $(document).ready(function() {
             data['checkouts'] = checkouts;
         var accounts = getSelectedMultiple($accounts);
             data['accounts'] = accounts;
+        history.api_options = data ;
 
-        $.ajax({
-            dataType: "json",
-            url     : "{% url 'kfet.history.json' %}",
-            method  : "POST",
-            data    : data,
-        })
-        .done(function(data) {
-            for (var i=0; i<data['opegroups'].length; i++) {
-                khistory.addOpeGroup(data['opegroups'][i]);
-            }
-            var nb_opes = khistory.$container.find('.ope:not(.canceled)').length;
-            $('#nb_opes').text(nb_opes);
-        });
+        // Update history
+        history.reset();
     }
 
     $('#from_date').datetimepicker({
@@ -136,96 +131,13 @@ $(document).ready(function() {
     });
 
     $("input").on('dp.change change', function() {
-        khistory.reset();
-        getHistory();
+        updateHistory();
     });
 
-    khistory.$container.selectable({
-        filter: 'div.opegroup, div.ope',
-        selected: function(e, ui) {
-            $(ui.selected).each(function() {
-                if ($(this).hasClass('opegroup')) {
-                    var type = $(this).data('type');
-                    var id = $(this).data('id');
-                    $(this).siblings('.ope').filter(function() {
-                        return $(this).data(type) == id
-                    }).addClass('ui-selected');
-                }
-            });
-        },
-    });
-
-    $(document).on('keydown', function (e) {
-        if (e.keyCode == 46) {
-            // DEL (Suppr)
-            var opes_to_cancel = [];
-            khistory.$container.find('.ope.ui-selected').each(function () {
-                opes_to_cancel.push($(this).data('type')+' '+$(this).data('id'));
-            });
-            if (opes_to_cancel.length > 0)
-                confirmCancel(opes_to_cancel);
-        }
-    });
-
-    function confirmCancel(opes_to_cancel) {
-        var nb = opes_to_cancel.length;
-        var content = nb+' opération va être annulée'.pluralize(nb, ' opérations vont être annulées')
-        $.confirm({
-            title: 'Confirmation',
-            content: content,
-            backgroundDismiss: true,
-            animation: 'top',
-            closeAnimation: 'bottom',
-            keyboardEnabled: true,
-            confirm: function() {
-                cancelOperations(opes_to_cancel);
-            }
-        });
-    }
-
-    function cancelOperations(opes_array, password = '') {
-        if (lock == 1)
-            return false
-        lock = 1 ;
-        var data = { 'operations' : opes_array }
-        $.ajax({
-            dataType: "json",
-            url     : "{% url 'kfet.kpsul.cancel_operations' %}",
-            method  : "POST",
-            data    : data,
-            beforeSend: function ($xhr) {
-                $xhr.setRequestHeader("X-CSRFToken", csrftoken);
-                if (password != '')
-                    $xhr.setRequestHeader("KFetPassword", password);
-            },
-
-        })
-        .done(function(data) {
-            khistory.$container.find('.ui-selected').removeClass('ui-selected');
-            lock = 0 ;
-        })
-        .fail(function($xhr) {
-            var data = $xhr.responseJSON;
-            switch ($xhr.status) {
-                case 403:
-                    requestAuth(data, function(password) {
-                        cancelOperations(opes_array, password);
-                    });
-                    break;
-                case 400:
-                    displayErrors(getErrorsHtml(data));
-                    break;
-            }
-            lock = 0 ;
-
-        });
-    }
-
     // -----
     // Synchronization
     // -----
 
-
     websocket_msg_default = {'opegroups':[],'opes':[]}
 
     var websocket_protocol = window.location.protocol == 'https:' ? 'wss' : 'ws';
@@ -234,21 +146,11 @@ $(document).ready(function() {
     socket = new ReconnectingWebSocket(websocket_protocol+"://" + location_url + "/ws/k-fet/k-psul/");
     socket.onmessage = function(e) {
         data = $.extend({}, websocket_msg_default, JSON.parse(e.data));
-
-        for (var i=0; i<data['opegroups'].length; i++) {
-            if (data['opegroups'][i]['cancellation']) {
-                khistory.cancelOpeGroup(data['opegroups'][i]);
-            }
-        }
-        for (var i=0; i<data['opes'].length; i++) {
-            if (data['opes'][i]['cancellation']) {
-                khistory.cancelOpe(data['opes'][i]);
-            }
-        }
+        history.update_data(data);
     }
 
 
-    getHistory();
+    updateHistory();
 });
 </script>
 
diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index e12e836d..45b50905 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -167,27 +167,6 @@
 {% csrf_token %}
 
 <script type="text/javascript">
-
-function intCheck(v) {
-    return Number.parseInt(v);
-}
-
-function floatCheck(v) {
-    if (typeof v === 'number')
-        return v;
-    return Number.parseFloat(v);
-}
-
-function booleanCheck(v) {
-    return v == true;
-}
-
-function functionCheck(v) {
-    if (typeof v === 'function')
-        return v;
-    return function(){};
-}
-
 $(document).ready(function() {
     'use strict';
     // -----
@@ -195,7 +174,7 @@ $(document).ready(function() {
     // -----
 
     // Lock to avoid multiple requests
-    var lock = 0;
+    window.lock = 0;
 
     // -----
     // Auth