Questions Tagged bug
Scheduler - Event disappears if start is not in viewport
Answered: I am using the default theme, I am just changing colours on the before render events. I have turned floating events off and it works fine for what I need.
DayPilot.Bubble() does not hide automatically anymore
Answered: Hi Leo, This logic hasn’t changed recently. In the demo, it seems to work fine. There are two things to check: Setting the value to 0 disables hiding. If you want to use the shortest delay possible, ...
Cannot set properties of null (setting 'overlapping')
Answered: Hi Leo, This issue should be fixed now in the latest sandbox build (2025.4.6672). It was relatively harmless - it had no effect on the UI in most cases. You could reproduce it using Ctrl + click on a...
navigator is not defined for next js application
Answered: Unfortunately, I’m not able to reproduce the issue with Next.js 14 and 15. With 'use client';, you should be able to import DayPilotScheduler in a standard way: import {DayPilot, DayPilotScheduler} f...
RTL is broken past v3.32.1
Answered: Calendar RTL compatibility is in the queue and it’s coming soon (within weeks). Just note that RTL will not be supported for the Scheduler in the near future - this is a much more complex issue than ...
React Scheduler > Uncaught Error when moving resource after collapse
Answered: The latest sandbox build (2025.3.6659) now supports rows.collapse() method and onRowMoveStart event. You can use them to implement this functionality: onRowMoveStart: args => {
scheduler.rows.co...
Events incorrectly overlapping in Scheduler
Answered: In this particular case, it is by design: The overlaps are resolved on pixel level, not on time level. That is necessary for proper display. The Scheduler enforces a minimum width of 1 px for small e...
Scheduler shows different values than what being rendered by onBeforeTimeHeaderDomAdd
Answered: This can happen if the floating time headers are enabled (they are by default). The Scheduler isn’t aware of the custom component content and it uses the default HTML value for the floating divs. You...
[Excel export] Cannot merge already merged cells
Answered: Hi Leo, Thanks for the update. This issue should be fixed now in the latest sandbox build (2025.3.6647). Please let me know if the problem persists.
React scheduler PRO (trial) crashes when there is link between off-screen items
Answered: This issue should be fixed now in the latest release (2025.3.6631).
2 Typescript types missing for the Calendar
Answered: The TypeScript definitions for these members are now available in the latest sandbox build (2025.3.6621). If there is any problem, please let me know.
DayPilot 4.3.0 with VueJS 3
Answered: Unfortunately, I’m not able to reproduce the issue. However, I recommend using the UI Builder app to generate a Vue project with the required boilerplate. It lets you download a configured component ...
Compilation error when running unit tests
Answered: This should be fixed now in the latest sandbox build (2025.3.6593). Please let me know if the problem persists.
[Excel export] Cannot merge already merged cells
Answered: Hi Leo, Most likely, it‘s related to the row headers (number of columns, column titles…). You can also try posting the error stack trace.
Scheduler: Cannot read properties of null (reading 'calendar')
Answered: Hi Leo, The error #2 should be fixed now. There was an issue with events located next to a disabled parent row (treePreventParentUsage: true) when you tried to move them into the disabled row and sta...
Year view Bug in Scheduler
Answered: Thanks. In such a zoomed-out view, the event width can get very small if you turn off the event boxes feature. With event boxes enabled (that’s the default setting), the event width is aligned with t...
[Calendar] Clicking anywhere in the Calendar triggers a click in another cell ever since upgrading to 3.33.0 and later (4.2.0 current latest version)
Answered: This looks like a regression of a bug that was fixed in 3.32.1 (incorrect args.cell.start/end in onTimeRangeSelect/onTimeRangeSelected events when heightSpec is set to "BusinessHoursNoScroll"). It sh...
DayPilot.Scheduler selection incorrectly selects all events in box
Answered: Hi Leo, This should be fixed now in the latest sandbox build (2025.3.6530). Please let me know if the problem persists.
Chromium browsers: Cannot read properties of null (reading 'client')
Answered: There is a small delay before the tap-and-hold event action (moving, context menu) is activated (defined by tapAndHoldTimeout). If the event is deleted during this time, you may see this error. In th...
Missing types for DayPilot.Gantt
Answered: The missing TypeScript definitions have been added now in the latest sandbox build (2025.3.6529). The only exception is DayPilot.GanttBeforeCellRenderArgs.cell.areas - this is already available but i...
onEventEditKeyDown acces current text
Answered: In onEventEditKeyDown, the args.element property stores the <textarea> element used for editing. You can get the current text using args.element.value.
Export Data Issue in RTL
Answered: At this moment, the image export of the Calendar component doesn’t work for RTL. This feature is in the queue and it will be implemented in the near future.
Unexpected vertical scrolling behavior in Resource View since version 2023.4.5839
Answered: Hi Roman, Since version 2023.4.5839, the Calendar resources view supports a vertical timeline longer than 1 day. To display only 1 day on the vertical axis, you need to set the days property to 1. Pl...
Scheduler: Infinite Scrolling issues on iOS
Answered: Hi Leo, It should be fixed now in the latest sandbox build (2025.3.6524). Please let me know if the problem persists.
12pm is logged in the database as 24 hours later
Answered: This behavior is correct, if you add 10 hours to "2025-06-10T14:00:00", you will get the end of June 10, which is "2025-06-11T00:00:00". There is a related setting (the eventEndSpec property) in the ...
Highlighting Weekends didn't work
Answered: Sorry for the confusion, the cell customization is not yet available in the Scheduler in the Lite version. It will be added in one of the future releases.
Kanban Card Touch Issue
Answered: Unfortunately, I’m not able to reproduce the issue. If you set custom HTML content of Kanban card, it may interfere with the require event handlers. If you are able to reproduce the problem in the on...
All-day events in 5-day Resources scheduler always appear on Monday after upgrading to v2023.4.5839
Answered: In the resources view, all-day events are always displayed only in the first matching column. This is by design, because the columns can have arbitrary IDs and dates. If the behavior was different in...
Timesheet Histogram
Answered: In the ASP.NET Core Timesheet tutorial, the histogram displayed in the first (frozen) row is calculated using the following logic (in onBeforeCellRender): onBeforeCellRender: args => {
if (arg...
Right click on frozen rows not working
Answered: The fix is now included in the latest sandbox build (2025.2.6492). Thank you!
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