Calendar view for purchase orders

InvenTree/templates/base.html

@@ -123,6 +123,7 @@ InvenTree
 <script type='text/javascript' src="{% url 'stock.js' %}"></script>
 <script type='text/javascript' src="{% url 'build.js' %}"></script>
 <script type='text/javascript' src="{% url 'order.js' %}"></script>
+<script type='text/javascript' src="{% url 'calendar.js' %}"></script>
 <script type='text/javascript' src="{% url 'table_filters.js' %}"></script>
 
 <script type='text/javascript' src="{% static 'fontawesome/js/solid.js' %}"></script>

InvenTree/templates/js/calendar.js

@@ -0,0 +1,25 @@
+{% load i18n %}
+
+/**
+ * Helper functions for calendar display
+ */
+
+function startDate(calendar) {
+    // Extract the first displayed date on the calendar
+    return calendar.currentData.dateProfile.activeRange.start.toISOString().split("T")[0];
+}
+
+function endDate(calendar) {
+    // Extract the last display date on the calendar
+    return calendar.currentData.dateProfile.activeRange.end.toISOString().split("T")[0];
+}
+
+function clearEvents(calendar) {
+    // Remove all events from the calendar
+
+    var events = calendar.getEvents();
+
+    events.forEach(function(event) {
+        event.remove();
+    })
+}