diff --git a/kfet/static/kfet/js/history.js b/kfet/static/kfet/js/history.js
index c087d56a..2869ea86 100644
--- a/kfet/static/kfet/js/history.js
+++ b/kfet/static/kfet/js/history.js
@@ -7,6 +7,20 @@ function KHistory(options = {}) {
 
     this.$container = $(this.container);
 
+    this.$container.selectable({
+        filter: 'div.opegroup, div.ope',
+        selected: function (e, ui) {
+            $(ui.selected).each(function () {
+                if ($(this).hasClass('opegroup')) {
+                    var opegroup = $(this).data('id');
+                    $(this).siblings('.ope').filter(function () {
+                        return $(this).data('opegroup') == opegroup
+                    }).addClass('ui-selected');
+                }
+            });
+        },
+    });
+
     this.reset = function () {
         this.$container.html('');
     };
@@ -189,6 +203,63 @@ function KHistory(options = {}) {
         $opegroup.find('.amount').text(amount);
     }
 
+    this.fetch = function (fetch_options) {
+        options = $.extend({}, this.fetch_options, fetch_options);
+        var that = this;
+        $.ajax({
+            dataType: "json",
+            url: django_urls["kfet.history.json"](),
+            method: "POST",
+            data: options,
+        }).done(function (data) {
+            for (let opegroup of data['opegroups']) {
+                that.addOpeGroup(opegroup);
+            }
+        });
+    }
+
+    this.cancel_opes = function (opes, password = "") {
+        if (window.lock == 1)
+            return false
+        window.lock = 1;
+        $.ajax({
+            dataType: "json",
+            url: django_urls["kfet.kpsul.cancel_operations"](),
+            method: "POST",
+            data: {
+                'operations': opes
+            },
+            beforeSend: function ($xhr) {
+                $xhr.setRequestHeader("X-CSRFToken", csrftoken);
+                if (password != '')
+                    $xhr.setRequestHeader("KFetPassword", password);
+            },
+
+        }).done(function (data) {
+            window.lock = 0;
+        }).fail(function ($xhr) {
+            var data = $xhr.responseJSON;
+            switch ($xhr.status) {
+                case 403:
+                    requestAuth(data, function (password) {
+                        this.cancel(opes, password);
+                    });
+                    break;
+                case 400:
+                    displayErrors(getErrorsHtml(data));
+                    break;
+            }
+            window.lock = 0;
+        });
+    }
+
+    this.cancel_selected = function () {
+        var opes_to_cancel = this.$container.find('.ope.ui-selected').map(function () {
+            return $(this).data('id');
+        }).toArray();
+        if (opes_to_cancel.length > 0)
+            this.cancel(opes_to_cancel);
+    }
 }
 
 KHistory.default_options = {
diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index 171c7030..c745d598 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -189,7 +189,7 @@ $(document).ready(function() {
     // -----
 
     // Lock to avoid multiple requests
-    lock = 0;
+    window.lock = 0;
 
     // Retrieve settings
 
@@ -479,9 +479,9 @@ $(document).ready(function() {
     var operations     = $('#operation_formset');
 
     function performOperations(password = '') {
-        if (lock == 1)
+        if (window.lock == 1)
             return false;
-        lock = 1;
+        window.lock = 1;
         var data = operationGroup.serialize() + '&' + operations.serialize();
         $.ajax({
             dataType: "json",
@@ -497,7 +497,7 @@ $(document).ready(function() {
         .done(function(data) {
             updatePreviousOp();
             coolReset();
-            lock = 0;
+            window.lock = 0;
         })
         .fail(function($xhr) {
             var data = $xhr.responseJSON;
@@ -513,7 +513,7 @@ $(document).ready(function() {
                     }
                     break;
             }
-            lock = 0;
+            window.lock = 0;
         });
     }
 
@@ -522,55 +522,6 @@ $(document).ready(function() {
         performOperations();
     });
 
-    // -----
-    // Cancel operations
-    // -----
-
-    var cancelButton = $('#cancel_operations');
-    var cancelForm   = $('#cancel_form');
-
-    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 != '')
-                    $xhr.setRequestHeader("KFetPassword", password);
-            },
-
-        })
-        .done(function(data) {
-            coolReset();
-            lock = 0;
-        })
-        .fail(function($xhr) {
-            var data = $xhr.responseJSON;
-            switch ($xhr.status) {
-                case 403:
-                    requestAuth(data, function(password) {
-                        cancelOperations(opes_array, password);
-                    }, triInput);
-                    break;
-                case 400:
-                    displayErrors(getErrorsHtml(data));
-                    break;
-            }
-            lock = 0;
-        });
-    }
-
-    // Event listeners
-    cancelButton.on('click', function() {
-        cancelOperations();
-    });
-
     // -----
     // Articles data
     // -----
@@ -1189,24 +1140,12 @@ $(document).ready(function() {
     // History
     // -----
 
-    khistory = new KHistory();
-
-    function getHistory() {
-        var data = {
+    khistory = new KHistory({
+        fetch_options: {
             from: moment().subtract(1, 'days').format('YYYY-MM-DD HH:mm:ss'),
-        };
-        $.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]);
-            }
-        });
-    }
+            opesonly: true,
+        },
+    });
 
     var previousop_container = $('#previous_op');
 
@@ -1302,29 +1241,10 @@ $(document).ready(function() {
     // Cancel from history
     // -----
 
-    khistory.$container.selectable({
-        filter: 'div.opegroup, div.ope',
-        selected: function(e, ui) {
-            $(ui.selected).each(function() {
-                if ($(this).hasClass('opegroup')) {
-                    var opegroup = $(this).data('opegroup');
-                    $(this).siblings('.ope').filter(function() {
-                        return $(this).data('opegroup') == opegroup
-                    }).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('ope'));
-            });
-            if (opes_to_cancel.length > 0)
-                cancelOperations(opes_to_cancel);
+            khistory.cancel_selected()
         }
     });
 
@@ -1396,7 +1316,7 @@ $(document).ready(function() {
         khistory.reset();
         resetSettings().done(function (){
             getArticles();
-            getHistory();
+            khistory.fetch();
             displayAddcost();
         });
     }