extend cart without full page reload

src/pretix/base/services/cart.py

@@ -1655,7 +1655,7 @@ def clear_cart(self, event: Event, cart_id: str=None, locale='en', sales_channel
 
 
 @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,))
-def extend_cart_reservation(self, event: Event, cart_id: str=None, locale='en', sales_channel='web', override_now_dt: datetime=None) -> None:
+def extend_cart_reservation(self, event: Event, cart_id: str=None, locale='en', sales_channel='web', override_now_dt: datetime=None) -> dict:
     """
     Resets the expiry time of a cart to the configured reservation time of this event.
     Limited to 11x the reservation time.
@@ -1672,7 +1672,7 @@ def extend_cart_reservation(self, event: Event, cart_id: str=None, locale='en',
             try:
                 cm = CartManager(event=event, cart_id=cart_id, sales_channel=sales_channel)
                 cm.commit()
-                return cm.num_extended_positions
+                return {"success": cm.num_extended_positions, "expiry": cm._expiry, "max_expiry_extend": cm._max_expiry_extend}
             except LockTimeoutException:
                 self.retry()
         except (MaxRetriesExceededError, LockTimeoutException):

src/pretix/base/views/tasks.py

@@ -68,7 +68,7 @@ class AsyncMixin:
     def get_check_url(self, task_id, ajax):
         return self.request.path + '?async_id=%s' % task_id + ('&ajax=1' if ajax else '')
 
-    def _ajax_response_data(self):
+    def _ajax_response_data(self, value):
         return {}
 
     def _return_ajax_result(self, res, timeout=.5):
@@ -85,7 +85,7 @@ class AsyncMixin:
                 logger.warning('Ignored ResponseError in AsyncResult.get()')
             except ConnectionError:
                 # Redis probably just restarted, let's just report not ready and retry next time
-                data = self._ajax_response_data()
+                data = self._ajax_response_data(None)
                 data.update({
                     'async_id': res.id,
                     'ready': False
@@ -93,7 +93,7 @@ class AsyncMixin:
                 return data
 
         state, info = res.state, res.info
-        data = self._ajax_response_data()
+        data = self._ajax_response_data(info)
         data.update({
             'async_id': res.id,
             'ready': ready,

src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html

@@ -11,31 +11,31 @@
     <h2>{% trans "Review order" %}</h2>
     {% include "pretixpresale/event/fragment_checkoutflow.html" %}
     <p>{% trans "Please review the details below and confirm your order." %}</p>
+    <div class="panel panel-primary cart">
+        <div class="panel-heading panel-heading-flex">
+            <h3 class="panel-title">
+                <i class="fa fa-shopping-cart" aria-hidden="true"></i>
+                {% trans "Your cart" %}
+                <a href="{% eventurl request.event "presale:event.index" cart_namespace=cart_namespace|default_if_none:"" %}" class="h6">
+                    <span class="fa fa-edit" aria-hidden="true"></span>{% trans "Add or remove tickets" %}
+                </a>
+            </h3>
+            <span class="panel-heading-flex-gap"></span>
+            <strong class="helper-display-block" id="cart-deadline-short" data-expires="{{ cart.first_expiry|date:"Y-m-d H:i:sO" }}">
+                {% if cart.minutes_left > 0 or cart.seconds_left > 0 %}
+                    {{ cart.minutes_left|stringformat:"02d" }}:{{ cart.seconds_left|stringformat:"02d" }}
+                {% else %}
+                    {% trans "Cart expired" %}
+                {% endif %}
+            </strong>
+        </div>
+        <div class="panel-body">
+            {% include "pretixpresale/event/fragment_cart.html" with cart=cart event=request.event editable=False %}
+        </div>
+    </div>
     <form method="post" data-asynctask
             data-asynctask-headline="{% trans "Please hang tight, we're finalizing your order!" %}">
         {% csrf_token %}
-        <div class="panel panel-primary cart">
-            <div class="panel-heading panel-heading-flex">
-                <h3 class="panel-title">
-                    <i class="fa fa-shopping-cart" aria-hidden="true"></i>
-                    {% trans "Your cart" %}
-                    <a href="{% eventurl request.event "presale:event.index" cart_namespace=cart_namespace|default_if_none:"" %}" class="h6">
-                        <span class="fa fa-edit" aria-hidden="true"></span>{% trans "Add or remove tickets" %}
-                    </a>
-                </h3>
-                <span class="panel-heading-flex-gap"></span>
-                <strong class="helper-display-block" id="cart-deadline-short" data-expires="{{ cart.first_expiry|date:"Y-m-d H:i:sO" }}">
-                    {% if cart.minutes_left > 0 or cart.seconds_left > 0 %}
-                        {{ cart.minutes_left|stringformat:"02d" }}:{{ cart.seconds_left|stringformat:"02d" }}
-                    {% else %}
-                        {% trans "Cart expired" %}
-                    {% endif %}
-                </strong>
-            </div>
-            <div class="panel-body">
-                {% include "pretixpresale/event/fragment_cart.html" with cart=cart event=request.event editable=False %}
-            </div>
-        </div>
         {% if payments %}
             <div class="panel panel-default">
                 <div class="panel-heading">

src/pretix/presale/templates/pretixpresale/event/fragment_cart.html

@@ -492,10 +492,10 @@
 <div class="row">
     <div class="col-md-12">
     {% if not cart.is_ordered %}
-        <form class="text-muted"
-                method="post" data-asynctask action="{% eventurl request.event "presale:event.cart.extend" cart_namespace=cart_namespace %}">
+        <form class="text-muted" id="cart-extend-form" data-asynctask data-asynctask-no-redirect
+                method="post" action="{% eventurl request.event "presale:event.cart.extend" cart_namespace=cart_namespace %}">
             {% csrf_token %}
-            <span id="cart-deadline" data-expires="{{ cart.first_expiry|date:"Y-m-d H:i:sO" }}">
+            <span id="cart-deadline" data-expires="{{ cart.first_expiry|date:"Y-m-d H:i:sO" }}" data-max-expiry-extend="{{ cart.max_expiry_extend|date:"Y-m-d H:i:sO" }}">
                 {% if cart.minutes_left > 0 or cart.seconds_left > 0 %}
                     {% blocktrans trimmed with minutes=cart.minutes_left %}
                         The items in your cart are reserved for you for {{ minutes }} minutes.

src/pretix/presale/views/__init__.py

@@ -229,11 +229,13 @@ class CartMixin:
 
         try:
             first_expiry = min(p.expires for p in positions) if positions else now()
+            max_expiry_extend = min(p.max_extend for p in positions) if positions else now()
             total_seconds_left = max(first_expiry - now(), timedelta()).total_seconds()
             minutes_left = int(total_seconds_left // 60)
             seconds_left = int(total_seconds_left % 60)
         except AttributeError:
             first_expiry = None
+            max_expiry_extend = None
             minutes_left = None
             seconds_left = None
 
@@ -250,6 +252,7 @@ class CartMixin:
             'minutes_left': minutes_left,
             'seconds_left': seconds_left,
             'first_expiry': first_expiry,
+            'max_expiry_extend': max_expiry_extend,
             'is_ordered': bool(order),
             'itemcount': sum(c.count for c in positions if not c.addon_to),
             'current_selected_payments': [p for p in self.current_selected_payments(total) if p.get('multi_use_supported')]

src/pretix/presale/views/cart.py

@@ -542,8 +542,11 @@ class CartExtendReservation(EventViewMixin, CartActionMixin, AsyncAction, View):
     task = extend_cart_reservation
     known_errortypes = ['CartError']
 
+    def _ajax_response_data(self, value):
+        return value
+
     def get_success_message(self, value):
-        if value > 0:
+        if value['success'] > 0:
             return _('Your cart timeout was extended.')
 
     def post(self, request, *args, **kwargs):
@@ -561,7 +564,7 @@ class CartAdd(EventViewMixin, CartActionMixin, AsyncAction, View):
     def get_success_message(self, value):
         return _('The products have been successfully added to your cart.')
 
-    def _ajax_response_data(self):
+    def _ajax_response_data(self, value):
         cart_id = get_or_create_cart_id(self.request)
         return {
             'cart_id': cart_id,

src/pretix/static/pretixbase/js/asynctask.js

@@ -5,36 +5,58 @@ var async_task_check_url = null;
 var async_task_old_url = null;
 var async_task_is_download = false;
 var async_task_is_long = false;
+var async_task_dont_redirect = false;
 
-function async_task_check() {
+
+var async_task_status_messages = {
+    long_task_started: gettext(
+        'Your request is currently being processed. Depending on the size of your event, this might take up to ' +
+        'a few minutes.'
+    ),
+    long_task_pending: gettext(
+        'Your request has been queued on the server and will soon be ' +
+        'processed.'
+    ),
+    short_task: gettext(
+        'Your request arrived on the server but we still wait for it to be ' +
+        'processed. If this takes longer than two minutes, please contact us or go ' +
+        'back in your browser and try again.'
+    )
+};
+
+function async_task_schedule_check(context, timeout) {
     "use strict";
-    $.ajax(
-        {
-            'type': 'GET',
-            'url': async_task_check_url,
-            'success': async_task_check_callback,
-            'error': async_task_check_error,
-            'context': this,
-            'dataType': 'json'
-        }
-    );
+    async_task_timeout = window.setTimeout(function() {
+        $.ajax(
+            {
+                'type': 'GET',
+                'url': async_task_check_url,
+                'success': async_task_check_callback,
+                'error': async_task_check_error,
+                'context': context,
+                'dataType': 'json'
+            }
+        );
+    }, timeout);
 }
 
 function async_task_on_success(data) {
     "use strict";
-    if (async_task_is_download && data.success) {
+    if ((async_task_is_download || async_task_dont_redirect) && data.success) {
         waitingDialog.hide();
         if (location.href.indexOf("async_id") !== -1) {
             history.replaceState({}, "pretix", async_task_old_url);
         }
     }
-    location.href = data.redirect;
+    if (!async_task_dont_redirect)
+        location.href = data.redirect;
+    $(this).trigger('pretix:async-task-success', data);
 }
 
 function async_task_check_callback(data, textStatus, jqXHR) {
     "use strict";
     if (data.ready && data.redirect) {
-        async_task_on_success(data);
+        async_task_on_success.call(this, data);
         return;
     } else if (typeof data.percentage === "number") {
         $("#loadingmodal .progress").show();
@@ -55,7 +77,7 @@ function async_task_check_callback(data, textStatus, jqXHR) {
             }
         }
     }
-    async_task_timeout = window.setTimeout(async_task_check, 250);
+    async_task_schedule_check(this, 250);
 
     if (async_task_is_long) {
         if (data.started) {
@@ -117,7 +139,7 @@ function async_task_check_error(jqXHR, textStatus, errorThrown) {
             // 500 can be an application error or overload in some cases :(
             $("#loadingmodal p.status").text(gettext('We currently cannot reach the server, but we keep trying.' +
                                               ' Last error code: {code}').replace(/\{code\}/, jqXHR.status));
-            async_task_timeout = window.setTimeout(async_task_check, 5000);
+            async_task_schedule_check(this, 5000);
         }
     }
 }
@@ -126,12 +148,12 @@ function async_task_callback(data, jqXHR, status) {
     "use strict";
     $("body").data('ajaxing', false);
     if (data.redirect) {
-        async_task_on_success(data);
+        async_task_on_success.call(this, data);
         return;
     }
     async_task_id = data.async_id;
     async_task_check_url = data.check_url;
-    async_task_timeout = window.setTimeout(async_task_check, 100);
+    async_task_schedule_check(this, 100);
 
     if (async_task_is_long) {
         if (data.started) {
@@ -160,9 +182,9 @@ function async_task_callback(data, jqXHR, status) {
 function async_task_error(jqXHR, textStatus, errorThrown) {
     "use strict";
     $("body").data('ajaxing', false);
+    waitingDialog.hide();
     if (textStatus === "timeout") {
         alert(gettext("The request took too long. Please try again."));
-        waitingDialog.hide();
     } else if (jqXHR.responseText.indexOf('<html') > 0) {
         var respdom = $(jqXHR.responseText);
         var c = respdom.filter('.container');
@@ -180,18 +202,14 @@ function async_task_error(jqXHR, textStatus, errorThrown) {
 
         } else if (c.length > 0) {
             // This is some kind of 500/404/403 page, show it in an overlay
-            waitingDialog.hide();
             ajaxErrDialog.show(c.first().html());
         } else {
-            waitingDialog.hide();
             alert(gettext('An error of type {code} occurred.').replace(/\{code\}/, jqXHR.status));
         }
     } else {
         if (jqXHR.status >= 400 && jqXHR.status < 500) {
-            waitingDialog.hide();
             alert(gettext('An error of type {code} occurred.').replace(/\{code\}/, jqXHR.status));
         } else {
-            waitingDialog.hide();
             alert(gettext('We currently cannot reach the server. Please try again. ' +
                           'Error code: {code}').replace(/\{code\}/, jqXHR.status));
         }
@@ -215,6 +233,7 @@ $(function () {
         }
         async_task_id = null;
         async_task_is_download = $(this).is("[data-asynctask-download]");
+        async_task_dont_redirect = $(this).is("[data-asynctask-no-redirect]");
         async_task_is_long = $(this).is("[data-asynctask-long]");
         async_task_old_url = location.href;
         $("body").data('ajaxing', true);

src/pretix/static/pretixpresale/js/ui/cart.js

@@ -33,8 +33,9 @@ var cart = {
             return;
         }
         var now = cart._get_now();
-        var diff_minutes = Math.floor(cart._deadline.diff(now) / 1000 / 60);
-        var diff_seconds = Math.floor(cart._deadline.diff(now) / 1000 % 60);
+        var diff_total_seconds = cart._deadline.diff(now) / 1000;
+        var diff_minutes = Math.floor(diff_total_seconds / 60);
+        var diff_seconds = Math.floor(diff_total_seconds % 60);
 
         if (diff_minutes < 2 || diff_minutes == 5) $("#cart-deadline").get(0).setAttribute("aria-live", "polite");
         else $("#cart-deadline").get(0).removeAttribute("aria-live");
@@ -45,6 +46,7 @@ var cart = {
                 gettext("Cart expired")
             );
             window.clearInterval(cart._deadline_interval);
+            cart._deadline_interval = null;
         } else {
             $("#cart-deadline").text(ngettext(
                 "The items in your cart are reserved for you for one minute.",
@@ -56,13 +58,26 @@ var cart = {
             );
         }
         $("#cart-extend-button").toggle(diff_minutes < 3);
+        var can_extend_cart = diff_minutes < 3 && (diff_total_seconds < 0 || cart._deadline < cart._max_extend);
+        $("#cart-extend-button").toggle(can_extend_cart);
     },
 
     init: function () {
         "use strict";
-        cart._deadline = moment($("#cart-deadline").attr("data-expires"));
-        cart._deadline_interval = window.setInterval(cart.draw_deadline, 500);
         cart._calc_offset();
+        cart.set_deadline(
+            $("#cart-deadline").attr("data-expires"),
+            $("#cart-deadline").attr("data-max-expiry-extend")
+        );
+    },
+
+    set_deadline: function (expiry, max_extend) {
+        "use strict";
+        cart._expiry_notified = false;
+        cart._deadline = moment(expiry);
+        cart._max_extend = moment(max_extend);
+        if (!cart._deadline_interval)
+            cart._deadline_interval = window.setInterval(cart.draw_deadline, 500);
         cart.draw_deadline();
     }
 };
@@ -74,6 +89,10 @@ $(function () {
         cart.init();
     }
 
+    $("#cart-extend-form").on("pretix:async-task-success", function(e, data, x, y, z) {
+        cart.set_deadline(data.expiry, data.max_expiry_extend);
+    });
+
     $(".toggle-container").each(function() {
         var summary = $(".toggle-summary", this);
         var content = $("> :not(.toggle-summary)", this);