Questions Tagged bug
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!
Rendering issue, misaligned events
Answered: Saw here and apparently it’s the global CSS border property messing with the table https://forums.daypilot.org/question/4960/why-daypilot-lines-are-not-aligned
Double Click edit option give exception between rows simultaneously.
Answered: Would you be able to modify the config of the row editing demo so that it reproduces the problem? It seems to work fine when you replace rowClickHandling: "Edit" with rowDoubleClickHandling: "Edit".
Daypilot.Month: Option "timeRangeSelectedHandling = 'Disabled'" doesn't work as aspected
Answered: Chistopher, This issue should be fixed now in the latest sandbox build (2025.2.6464). Please let me know if the problem persists.
Non-default cellDuration causes Calendar scroll position to change.
Answered: This issue should be fixed now in the latest sandbox build (2025.2.639):
when custom theme link is not proper
Answered: There is now a new version of the Theme Designer available. It will generate an up-to-date CSS. Please let me know if the problem persists.
ExcelJS is not an optional property in the scheduler config
Answered: Thanks for reporting the problem. This issue has been fixed in a special release (2025.1.6429), which is now available.
Facing issue while exporting data in RTL
Answered: Unfortunately, the image export is not supported in the RTL mode at the moment. It’s in the plan, but we can’t promise any delivery date.
overriding event start/end in moving to snap to a certain time isn't being reflected in the event overlap handling
Answered: It looks like you are using an older version - could you please give it a try with the latest release?
Error constructing DayPilot.Date()
Answered: Have you modified the source code? Or maybe you have overwritten the DayPilot.Date object? Because all this should work fine - you can also test it in the JavaScript console in the online demo.
BusinessHoursNoScroll not rendering args.start correctly
Answered: I confirm the bug. It should be fixed now in the latest sandbox build. The fix will be included in the next release.
Facing issue in calendar vertically scrolling with page scrolling
Answered: It is necessary to set a fixed position of the calendar in the page. You can do that by fixing the parent element and setting the height of the calendar to 100%. This way, you will be able to avoid t...
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