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Strange behaviour when navigating using keyboard API after entering inline editing mode

Answered: Thanks for the sample project. This issue should be fixed now in the latest sandbox build (2022.1.5180): In the latest release, you can work around the issue ...

Error: Event data item must specify 'start' property

Answered: This error suggests that the event data object doesn't have the correct structure. I recommend checking the object - it may look fine at first sight but make sure that it's a real object - and not a ...

Scheduler TypeError when right-clicking on a link between events

Answered: This issue should be fixed now in the latest release (2021.4.5165): Please let me know if there is any problem.

Separator in context menu not visible

Answered: It looks like you are using a custom CSS theme - you'll need to add styles for the separator which is created using two nested divs (div > div). Standard items are created using a div and an anchor e...

Row in DayPilot.GanttBeforeRowHeaderRenderArgs is missing html property

Answered: This should be fixed now in the latest sandbox build (2021.4.5161):

Keyboard API: Cannot read properties of null (reading 'keyboard')

Answered: This should be fixed now in the latest sandbox build (2021.4.5158). Could you please give it a try?

when change

Answered: I recommend following the Angular Scheduler Zoom tutorial which includes a working Angular project where everything works fine: In particular, y...

Missing typing in DayPilot.GanttPropsAndEvents

Answered: Hi Hicham, This should be fixed now in the latest sandbox build (2021.4.5152). Thanks for reporting the issue!

Week numbers at 2021 -> 2022 transition

Answered: Hi David, At this moment, the week number is calculated from the first date of the week. That results in week #53 for the transitional week. It's not always possible to provide a default behavior tha...

Scheduler fromStringSortable throwing exceptions

Answered: Thanks! That helped to identify the performance issue. It should be fixed now in the latest sandbox build (2021.4.5128, see for the Angular version). The constructor used to...

Using CSS3 zoom breaks Scheduler crosshair

Answered: Unfortunately, the CSS-level zoom is not supported at the moment. However, you should be able to achieve a similar effect by adjusting the dimensions properties (eventHeight, headerHeight, etc.) and ...

this in undefined in the addEvent example

Answered: This hint is correct, you can't use "this" in a functional React component. You'll need to create a variable instead: const Scheduler = () => { let scheduler: DayPilot.Scheduler; return...

UndoService in reactjs

Answered: Please see the following tutorial:

Scroll Issue in Resource Column only on Macbook trackpad?

Answered: This should be fixed now in the latest sandbox build (2021.3.5062): It looks like Safari started to report a different scrollbar width when a mouse is connect...

Uncaught DayPilot.Scheduler.resources expects an array object

Answered: The Scheduler checks if the object in the "resources" property is an array. If it isn't, it throws this exception. You should make sure that you are passing a correct object. I recommend printing the...

Problem with events and resources background

Answered: The image export only supports a limited set of CSS styles. The Scheduler tries to detect the background color but if you use an unsupported background style it will fail. You can override the auto-d...

Time range context menu does not work

Answered: This looks like an old copy of the demo. You can find the latest version here: It should work fine for both the time range selection (use...

After update 2020.4.3

Answered: This happens because some of your events use the same ID (the error message refers to "GQS217123") which is not allowed. You should make sure that the event IDs are unique.

DayPilot is not supporting Arabic language

Answered: The RTL text direction is only supported in the Pro version, you can find a demo here: At this moment, it's not supported in the Lite (open-sour...

Problem with exporting events

Answered: The Scheduler will include events that are loaded at the moment of export (it uses the event data from events.list) in the exported image. If you use dynamic loading (

Tap on event active area not working relieable on mobile device

Answered: Hi Benny, It looks like the default action uses "click" event which is not reliable on touch devices. It will be fixed in the next release. You can use 'action: "None"' as a workaround - that will bi...

Confusing documentation

Answered: Thanks for the feedback! It will be fixed soon.

Bubble showAfter setting has no effect

Answered: The bubble opened by an active area (action: "Bubble") is always displayed immediately. If you want to delay it you can use the following code: = [ { right: 0, ...

Disabled cell still working if my event is longer on the right than disabled cells

Answered: You should check if you really disable the correct cells. The background color needs to be set separately so it's possible that you didn't disable all the colored cells. It's unlikely that the Schedu...

Resize and drag not working if ShowNonBusiness is set to False

Answered: I was using the latest version. I now found the issue on a js conflict. I'm using prototype.js that has an "any" function that was throwing an error when moving or resizing event on the scheduler. Th...

Resize and drag nor working if OnIncludeCell event is used

Answered: This seems to be the same issue as

Scheduler TimeHeaderRow incorrect width

Answered: The auto-width features (row header width auto-fit and cell auto width) rely on the actual rendering to get some measurements. That happens in cases when it is not possible to calculate all dimension...

Scheduler RowHeaderHideIcon position does not update

Answered: This should be fixed now in the latest sandbox build (2021.1.4903):

Scheduler Alignment Bug in Chrome

Answered: Unfortunately I don't see the issue in the online demo of the Lite version: It might be a CSS interference issue - you can try to disable the global C...

DayPilotCalendar.UpdateWithMessage() not displaying message since 2020.4.3775

Answered: This issue should be fixed now in the latest sandbox build (2021.1.3785): Please let me know if the problem persists.
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