diff --git a/kfet/static/kfet/css/jconfirm-kfet.css b/kfet/static/kfet/css/jconfirm-kfet.css
index 0bd53ab7..6c27f77c 100644
--- a/kfet/static/kfet/css/jconfirm-kfet.css
+++ b/kfet/static/kfet/css/jconfirm-kfet.css
@@ -71,14 +71,19 @@
 
 .jconfirm .capslock .glyphicon {
     position: absolute;
+    display:none;
     padding: 10px;
     right: 0px;
     top: 15px;
     font-size: 30px;
-    display: none ;
     margin-left: 60px !important;
 }
 
+.capslock_on .capslock .glyphicon{
+    display: inline-block !important;
+}
+
+
 .jconfirm .capslock input {
     padding-right: 50px;
     padding-left: 50px;
diff --git a/kfet/static/kfet/js/kfet.js b/kfet/static/kfet/js/kfet.js
index cf120fd4..b30772a9 100644
--- a/kfet/static/kfet/js/kfet.js
+++ b/kfet/static/kfet/js/kfet.js
@@ -124,8 +124,33 @@ $(document).ready(function() {
             }
         });
     }
+
 });
 
+/*
+ * Capslock management
+ */
+
+window.capslock = -1; 
+$(document).on('keypress', function(e) {
+    var s = String.fromCharCode(e.which);
+    if ((s.toUpperCase() === s && s.toLowerCase() !== s && !e.shiftKey)|| //caps on, shift off
+        (s.toUpperCase() !== s && s.toLowerCase() === s && e.shiftKey)) { //caps on, shift on
+            $('body').addClass('capslock_on')
+    } else if ((s.toLowerCase() === s && s.toUpperCase() !== s && !e.shiftKey)|| //caps off, shift off
+               (s.toLowerCase() !== s && s.toUpperCase() === s && e.shiftKey)) { //caps off, shift on
+            $('body').removeClass('capslock_on')
+    }
+});
+
+$(document).on('keydown', function(e) {
+    if (e.which == 20) {
+        $('body').toggleClass('capslock_on')
+    }
+});
+
+
+
 function dateUTCToParis(date) {
     return moment.tz(date, 'UTC').tz('Europe/Paris');
 }
@@ -146,6 +171,58 @@ function isValidTrigramme(trigramme) {
     return trigramme.match(pattern);
 }
 
+/**
+ * Dialogs with user via jconfirm
+ */
+
+class UserDialog {
+
+    static get defaults() {
+        return {'title': '', 'content': ''};
+    }
+    
+    constructor(data) {
+        $.extend(this, this.constructor.defaults, data);
+    }
+
+    open(settings) {
+        // Arg management
+        var pre_content = settings.pre_content || '';
+        var post_content = settings.post_content || '';
+        var callback = settings.callback || $.noop;
+
+        var that = this;
+        $.confirm({
+            title: this.title,
+            content: pre_content + this.content + post_content,
+            backgroundDismiss: true,
+            animation:'top',
+            closeAnimation:'bottom',
+            keyboardEnabled: true,
+            confirm: function() {
+                var inputs = {};
+                this.$content.find('input').each(function () {
+                    inputs[$(this).attr('name')] = $(this).val();
+                });
+                if (Object.keys(inputs).length > 1)
+                    return callback(inputs);
+                else
+                    return callback(inputs[Object.keys(inputs)[0]]);
+            },
+            onOpen: function() {
+                var that = this
+                this.$content.find('input').on('keydown', function(e) {
+                    if (e.keyCode == 13) {
+                        e.preventDefault();
+                        that.$confirmButton.click();
+                    }
+                });
+            },
+            onClose: function() { if (settings.next_focus) { this._lastFocused = settings.next_focus; } }
+        });
+    }
+}
+
 function getErrorsHtml(data) {
     var content = '';
     if ('operation_group' in data['errors']) {
@@ -185,55 +262,55 @@ function getErrorsHtml(data) {
     return content;
 }
 
-function requestAuth(data, callback, focus_next = null) {
-    var content = getErrorsHtml(data);
-    content += '<div class="capslock"><span class="glyphicon glyphicon-lock"></span><input type="password" name="password" autofocus><div>',
-    $.confirm({
-        title: 'Authentification requise',
-        content: content,
-        backgroundDismiss: true,
-        animation:'top',
-        closeAnimation:'bottom',
-        keyboardEnabled: true,
-        confirm: function() {
-            var password = this.$content.find('input').val();
-            callback(password);
-        },
-        onOpen: function() {
-            var that = this;
-            var capslock = -1 ; // 1 -> caps on ; 0 -> caps off ; -1 or 2 -> unknown
-            this.$content.find('input').on('keypress', function(e) {
-                if (e.keyCode == 13)
-                    that.$confirmButton.click();
+var authDialog = new UserDialog({
+    'title': 'Authentification requise',
+    'content': '<div class="capslock"><span class="glyphicon glyphicon-lock"></span><input type="password" name="password" autofocus><div>',
+});
 
-                var s = String.fromCharCode(e.which);
-                if ((s.toUpperCase() === s && s.toLowerCase() !== s && !e.shiftKey)|| //caps on, shift off
-                    (s.toUpperCase() !== s && s.toLowerCase() === s && e.shiftKey)) { //caps on, shift on
-                        capslock = 1 ;
-                } else if ((s.toLowerCase() === s && s.toUpperCase() !== s && !e.shiftKey)|| //caps off, shift off
-                           (s.toLowerCase() !== s && s.toUpperCase() === s && e.shiftKey)) { //caps off, shift on
-                        capslock = 0 ;
-                }
-                if (capslock == 1)
-                    $('.capslock .glyphicon').show() ;
-                else if (capslock == 0)
-                    $('.capslock .glyphicon').hide() ;
-            });
-            // Capslock key is not detected by keypress
-            this.$content.find('input').on('keydown', function(e) {
-                if (e.which == 20) {
-                    capslock = 1-capslock ;
-                }
-                if (capslock == 1)
-                    $('.capslock .glyphicon').show() ;
-                else if (capslock == 0)
-                    $('.capslock .glyphicon').hide() ;
-            });
+function api_with_auth(settings, password) {
+    if (window.api_lock == 1)
+        return false;
+    window.api_lock = 1;
+
+    var url = settings.url;
+    if (!url)
+        return false;
+    var data = settings.data || {} ;
+    var on_success = settings.on_success || $.noop ;
+    var on_400 = settings.on_400 || $.noop ;
+
+    $.ajax({
+        dataType: "json",
+        url: url,
+        method: "POST",
+        data: data,
+        beforeSend: function ($xhr) {
+            $xhr.setRequestHeader("X-CSRFToken", csrftoken);
+            if (password)
+                $xhr.setRequestHeader("KFetPassword", password);
         },
-        onClose: function() {
-            if (focus_next)
-                this._lastFocused = focus_next;
+    })
+    .done(function(data) {
+        on_success(data);
+    })
+    .fail(function($xhr) {
+        var response = $xhr.responseJSON;
+        switch ($xhr.status) {
+            case 403:
+                authDialog.open({
+                    callback: function(password) {
+                        api_with_auth(settings, password)
+                    },
+                    pre_content: getErrorsHtml(response),
+                    next_focus: settings.next_focus,
+                });
+                break;
+            case 400:
+                on_400(response);
+                break;
         }
-
+    })
+    .always(function() {
+        window.api_lock = 0;
     });
 }
diff --git a/kfet/templates/kfet/history.html b/kfet/templates/kfet/history.html
index 091b4f2f..6d9dfa5c 100644
--- a/kfet/templates/kfet/history.html
+++ b/kfet/templates/kfet/history.html
@@ -13,8 +13,9 @@
 <script type="text/javascript" src="{% static 'kfet/js/moment-fr.js' %}"></script>
 <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="{% url 'js_reverse' %}"></script>
 <script type="text/javascript" src="{% static 'kfet/js/multiple-select.js' %}"></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 %}
 
@@ -60,6 +61,9 @@
 
 <script type="text/javascript">
 $(document).ready(function() {
+    // Lock to avoid multiple requests
+    window.lock = 0;
+
     settings = { 'subvention_cof': parseFloat({{ settings.subvention_cof|unlocalize }})}
 
     khistory = new KHistory();
@@ -179,79 +183,17 @@ $(document).ready(function() {
         });
     }
 
-    function requestAuth(data, callback) {
-        var content = getErrorsHtml(data);
-        content += '<input type="password" name="password" autofocus>',
-        $.confirm({
-            title: 'Authentification requise',
-            content: content,
-            backgroundDismiss: true,
-            animation:'top',
-            closeAnimation:'bottom',
-            keyboardEnabled: true,
-            confirm: function() {
-                var password = this.$content.find('input').val();
-                callback(password);
-            },
-            onOpen: function() {
-                var that = this;
-                this.$content.find('input').on('keypress', function(e) {
-                    if (e.keyCode == 13)
-                        that.$confirmButton.click();
-                });
-            },
-        });
-    }
-
-    function getErrorsHtml(data) {
-        var content = '';
-        if ('missing_perms' in data['errors']) {
-            content += 'Permissions manquantes';
-            content += '<ul>';
-            for (var i=0; i<data['errors']['missing_perms'].length; i++)
-                content += '<li>'+data['errors']['missing_perms'][i]+'</li>';
-            content += '</ul>';
-        }
-        if ('negative' in data['errors']) {
-            var url_base = "{% url 'kfet.account.update' LIQ}";
-            url_base = base_url(0, url_base.length-8);
-            for (var i=0; i<data['errors']['negative'].length; i++) {
-                content += '<a class="btn btn-primary" href="'+url_base+data['errors']['negative'][i]+'/edit" target="_blank">Autorisation de négatif requise pour '+data['errors']['negative'][i]+'</a>';
-            }
-        }
-        return content;
-    }
-
-    function cancelOperations(opes_array, password = '') {
+    function cancelOperations(opes_array) {
         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 != '')
-                    $xhr.setRequestHeader("KFetPassword", password);
+        api_with_auth({
+            url: Urls['kfet.kpsul.cancel_operations'](),
+            data: data,
+            on_success: function(data) {
+                khistory.$container.find('.ui-selected').removeClass('ui-selected');
+            },
+            on_400: function(data) {
+                displayErrors(getErrorsHtml(data));
             },
-
-        })
-        .done(function(data) {
-            khistory.$container.find('.ui-selected').removeClass('ui-selected');
-        })
-        .fail(function($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;
-            }
-
         });
     }
 
diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index bdfdb673..2112c2ec 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -176,12 +176,6 @@
 
 $(document).ready(function() {
     'use strict';
-    // -----
-    // General
-    // -----
-
-    // Lock to avoid multiple requests
-    var lock = 0;
 
     // -----
     // Auth
@@ -189,25 +183,20 @@ $(document).ready(function() {
 
     function askComment(callback) {
         var comment = $('#id_comment').val();
-        $.confirm({
+        var commentDialog = new UserDialog({
             title: 'Commentaire requis',
             content: '<input type="text" name="comment_opegroup" value="'+comment+'" autofocus>',
-            backgroundDismiss: true,
-            animation: 'top',
-            closeAnimation: 'bottom',
-            keyboardEnabled: true,
-            confirm: function() {
-                $('#id_comment').val(this.$content.find('input').val());
-                callback();
-            },
-            onOpen: function() {
-                var that = this;
-                this.$content.find('input').on('keydown', function(e) {
-                    if (e.keyCode == 13)
-                        that.$confirmButton.click();
-                });
-            },
-            onClose: function() { this._lastFocused = articleSelect; }
+
+        });
+
+        function confirm_callback(comment) {
+            $('#id_comment').val(comment);
+            callback();
+        }
+
+        commentDialog.open({
+            callback: confirm_callback,
+            next_focus: articleSelect
         });
     }
 
@@ -238,42 +227,22 @@ $(document).ready(function() {
     var operationGroup = $('#operationgroup_form');
     var operations     = $('#operation_formset');
 
-    function performOperations(password = '') {
-        if (lock == 1)
-            return false;
-        lock = 1;
+    function performOperations() {
         var data = operationGroup.serialize() + '&' + operations.serialize();
-        $.ajax({
-            dataType: "json",
-            url     : "{% url 'kfet.kpsul.perform_operations' %}",
-            method  : "POST",
-            data    : data,
-            beforeSend: function ($xhr) {
-                $xhr.setRequestHeader("X-CSRFToken", csrftoken);
-                if (password != '')
-                    $xhr.setRequestHeader("KFetPassword", password);
+        api_with_auth({
+            url: Urls['kfet.kpsul.perform_operations'](),
+            data: data,
+            on_success: function() {
+                updatePreviousOp();
+                coolReset();
             },
-        })
-        .done(function(data) {
-            updatePreviousOp();
-            coolReset();
-            lock = 0;
-        })
-        .fail(function($xhr) {
-            var data = $xhr.responseJSON;
-            switch ($xhr.status) {
-                case 403:
-                    requestAuth(data, performOperations, articleSelect);
-                    break;
-                case 400:
-                    if ('need_comment' in data['errors']) {
-                        askComment(performOperations);
-                    } else {
-                        displayErrors(getErrorsHtml(data));
-                    }
-                    break;
-            }
-            lock = 0;
+            on_400: function(response) {
+                if ('need_comment' in response['errors'])
+                    askComment(performOperations);
+                else
+                    displayErrors(getErrorsHtml(response));
+            },
+            next_focus: articleSelect,
         });
     }
 
@@ -289,40 +258,18 @@ $(document).ready(function() {
     var cancelButton = $('#cancel_operations');
     var cancelForm   = $('#cancel_form');
 
-    function cancelOperations(opes_array, password = '') {
-        if (lock == 1)
-            return false
-        lock = 1;
+    function cancelOperations(opes_array) {
         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 != '')
-                    $xhr.setRequestHeader("KFetPassword", password);
+        api_with_auth({
+            url: Urls['kfet.kpsul.cancel_operations'](),
+            data: data,
+            on_success: function() {
+                coolReset();
             },
-
-        })
-        .done(function(data) {
-            coolReset();
-            lock = 0;
-        })
-        .fail(function($xhr) {
-            var data = $xhr.responseJSON;
-            switch ($xhr.status) {
-                case 403:
-                    requestAuth(data, function(password) {
-                        cancelOperations(opes_array, password);
-                    }, account_manager._$input_trigramme);
-                    break;
-                case 400:
-                    displayErrors(getErrorsHtml(data));
-                    break;
-            }
-            lock = 0;
+            on_400: function(response) {
+                displayErrors(getErrorsHtml(response));
+            },
+            next_focus: kpsul.account_manager,
         });
     }
 
@@ -690,58 +637,43 @@ $(document).ready(function() {
     // Ask deposit or withdraw
     // -----
 
+
     function askDeposit(is_checkout=1) {
-        var title = is_checkout ? 'Montant de la charge' : "Montant de l'édition";
-        $.confirm({
-            title: title,
+        var depositDialog = new UserDialog({
+            title: is_checkout ? 'Montant de la charge' : "Montant de l'édition",
             content: '<input type="number" lang="en" step="0.01" min="0.01" on autofocus placeholder="€">',
-            backgroundDismiss: true,
-            animation:'top',
-            closeAnimation:'bottom',
-            keyboardEnabled: true,
-            confirm: function() {
-                var amount = this.$content.find('input').val();
-                if (!$.isNumeric(amount) || amount <= 0)
-                    return false;
-                addDeposit(amount, is_checkout);
-            },
-            onOpen: function() {
-                var that = this
-                this.$content.find('input').on('keydown', function(e) {
-                    if (e.keyCode == 13) {
-                        e.preventDefault();
-                        that.$confirmButton.click();
-                    }
-                });
-            },
-            onClose: function() { this._lastFocused = (articleSelect.val() ? articleNb : articleSelect) ; }
+        });
+
+        function callback(amount) {
+            if (!$.isNumeric(amount) || amount <= 0)
+                return false;
+            addDeposit(amount, is_checkout);
+
+        }
+        var next_focus = articleSelect.val() ? articleNb : articleSelect ;
+
+        depositDialog.open({
+            callback: callback,
+            next_focus: next_focus,
         });
     }
 
     function askWithdraw() {
-        $.confirm({
-            title: 'Montant du retrait',
-            content: '<input type="number" lang="en" step="0.01" min="0.01" on autofocus placeholder="€">',
-            backgroundDismiss: true,
-            animation:'top',
-            closeAnimation:'bottom',
-            keyboardEnabled: true,
-            confirm: function() {
-                var amount = this.$content.find('input').val();
-                if (!$.isNumeric(amount) || amount <= 0)
-                    return false;
-                addWithdraw(amount);
-            },
-            onOpen: function() {
-                var that = this
-                this.$content.find('input').on('keydown', function(e) {
-                    if (e.keyCode == 13) {
-                        e.preventDefault();
-                        that.$confirmButton.click();
-                    }
-                });
-            },
-            onClose: function() { this._lastFocused = articleSelect; }
+        var withdrawDialog = new UserDialog({
+            'title': 'Montant du retrait',
+            'content': '<input type="number" lang="en" step="0.01" min="0.01" on autofocus placeholder="€">',
+        });
+
+        function callback(amount) {
+            if (!$.isNumeric(amount) || amount <= 0)
+                return false;
+            addWithdraw(amount);
+
+        }
+
+        withdrawDialog.open({
+            callback: callback,
+            next_focus: articleSelect
         });
     }
 
@@ -865,60 +797,29 @@ $(document).ready(function() {
             $('body').css('animation', 'colorchange 3s infinite');
         }
     }
-    function sendAddcost(trigramme, amount, password='') {
-        var data = {
-            trigramme: trigramme,
-            amount: amount,
-        }
-        $.ajax({
-            dataType: "json",
-            url     : "{% url 'kfet.kpsul.update_addcost' %}",
-            method  : "POST",
-            data    : data,
-            beforeSend: function ($xhr) {
-                $xhr.setRequestHeader("X-CSRFToken", csrftoken);
-                if (password != '')
-                    $xhr.setRequestHeader("KFetPassword", password);
-            },
-        })
-        .fail(function($xhr) {
-            var data = $xhr.responseJSON;
-            switch ($xhr.status) {
-                case 403:
-                    requestAuth(data, function(password) {
-                        sendAddcost(trigramme, amount, password);
-                    }, account_manager._$input_trigramme);
-                    break;
-                case 400:
-                    askAddcost(getErrorsHtml(data));
-                    break;
-            }
-        });
-    }
+
 
     function askAddcost(errors = '') {
-        $.confirm({
-            title: 'Majoration',
-            content: errors + '<input type="text" placeholder="Trigramme" autocomplete="off" name="trigramme" spellcheck="false" style="text-transform:uppercase" autofocus><input type="number" lang="en" step="0.01" min="0.01" placeholder="€" name="amount">',
-            backgroundDismiss: true,
-            animation:'top',
-            closeAnimation:'bottom',
-            keyboardEnabled: true,
-            confirm: function() {
-                var trigramme = this.$content.find('input[name=trigramme]').val().toUpperCase();
-                var amount = this.$content.find('input[name=amount]').val();
-                sendAddcost(trigramme, amount);
-            },
-            onOpen: function() {
-                var that = this
-                this.$content.find('input[name=amount]').on('keydown', function(e) {
-                    if (e.keyCode == 13) {
-                        e.preventDefault();
-                        that.$confirmButton.click();
-                    }
-                });
-            },
-            onClose: function() { this._lastFocused = kpsul.account_manager.selection._$input; }
+        var addcostDialog = new UserDialog({
+            'title': 'Majoration',
+            'content': '<input type="text" placeholder="Trigramme" autocomplete="off" name="trigramme" spellcheck="false" style="text-transform:uppercase" autofocus><input type="number" lang="en" step="0.01" min="0.01" placeholder="€" name="amount">',
+        });
+
+        function callback(data) {
+            api_with_auth({
+                url: Urls['kfet.kpsul.update_addcost'](),
+                data: data,
+                on_400: function(response) {
+                    askAddcost(getErrorsHtml(response));
+                },
+                next_focus: kpsul.account_manager,
+            });
+        }
+
+        addcostDialog.open({
+            callback: callback, 
+            pre_content: errors, 
+            next_focus: kpsul.account_manager,
         });
     }