Questions Tagged javascript
args.alt, args.control, args.meta on drag events
Answered: Hi Leo, This is now added in the latest release (2026.2.6914). In addition to the event handlers, you can also get the current modifier key status using DayPilot.Calendar.getCoords() and DayPilot.Sch...
Right-click drag behaviour differences between Calendar and Scheduler
Hi Dan, The Calendar and Scheduler behave slightly different when right-clicking and dragging a time frame: The calendar only allows a click and prevents dragging a time frame The scheduler allows bo...
Infinite scrolling issue, Chrome on Mac
Answered: Hi Leo, There is a problem with the overlay (non-persistent) scrollbar: it is not possible to detect its actual height. So the Scheduler uses a guess value (which is now 14 pixels). If it doesn’t mat...
Critical regression: Infinite scrolling jumps
Answered: The overlay scrollbar fallback is applied only to selected browsers (Firefox everywhere and Webkit on Mac). In Webkit-based browsers you can force a fixed scrollbar (as described here) to solve this ...
onBeforeGridLineRender on DayPilot.Gantt
Answered: Hi Leo, This event handler is now available in the Gantt chart as well (in the latest sandbox build, 2026.2.6926).
Cannot set properties of null (setting 'innerHTML') on disposed instance
Answered: This should be fixed now in the latest sandbox build (2026.2.6904).
DayPilot.Calendar.getCoords() sometimes contains wrong information
Answered: The getCoords() method returns the position in the grid. If you are not in the grid anymore, it returns the last position. So when the mouse is over all-day events, it doesn’t have a useful value.
DayPilot.Scheduler.onEventMoved - no way to check for original even dates
Answered: Hi Leo, For this purpose, there are two events for each action, e.g. onEventMove and onEventMoved. In onEventMove, the args.e object is the original DayPilot.Event object and the new position is avai...
[Calendar] onEventResize returns incorrect args.newStart with heightSpec="BusinessHoursNoScroll" since v4.2.1
Answered: Thanks for reporting the issue. It should be fixed now in the latest sandbox build (2026.2.815).
Scheduler "Manual" scale with empty/undefined timeline error
Answered: This was an unintended side effect and the behavior is now reverted in the latest release (2026.2.6899). Please let me know if the problem persists.
events.findAll() in DayPilot.Calendar
Answered: Hi Leo, It’s now available in the latest sandbox build (2026.1.6887).
daypilot-lite-angular-5.4.1 | Missing namespace implementation Http
Answered: In the latest release, these interfaces were not marked as exported and they got stripped out of the Angular package during build time. It should be fixed now in the latest sandbox build. The fix wil...
Gantt: Add "padding" days
Answered: Hi Leo, It’s now available as paddingDays in the latest sandbox build (2026.1.6886);
Restrict event drag-and-drop to a specific time window per event
Answered: Hi Iliah, You can use the onEventMoving event handler to provide real-time feedback during drag and drop (see also event moving customization).
Ability to hide specific dates
Answered: Please take a look at the following docs page: Hiding Time Columns Just note that this feature is only available in the Pro version.
Gantt chart Link connecting Issue in angular
My problem is, In Angular Gantt Chart, a task(Task C) is not initially in my viewport and I try to link a Task( Task A - is initially in my viewport) to Task C by dragging at that time link connectin...
gantt daypilot angular link dots not visible if the task viewport is not initially visible
Answered: With autoScroll enabled, you should be able to scroll automatically to the target task while creating a link by dragging.
Infinite Scrolling: Time jump in Safari
Answered: This issue should be fixed now in the latest sandbox build (2026.1.6856). If there is any problem, please let me know.
Infinite Scrolling: Jumping on Firefox
Answered: This issue should be fixed now in the latest sandbox build (2026.1.6844).
How to do totals by column and conditional coloring of cells
Answered: Sorry for the delay. I would make a few changes: Instead of using a special time header row, use a frozen row. Mark this row with cellsAutoUpdated: true, that will re-render the content on every chan...
Parent100Pct not an option for heightSpec
Answered: Unfortunately, the 100% height feature is not implemented in the Lite version yet. It may be added in the future. To check feature availability in Lite/Pro versions, you can check the table at the bo...
Submenu does not trigger onClick anymore
Answered: This regression is fixed now in the latest sandbox build (2026.1.6823). If there is any problem, please let me know.
Timesheet separator
Answered: In the timesheet mode, you need to define separators with the date of the first row (i.e., add the specified hour to the first day): const timesheet = new DayPilot.Scheduler("scheduler", {
viewTyp...
"dp.events.update(dpEvent)" sometimes redraw all Events on a *Month* calendar
Answered: This optimization is now implemented for the Month control as well in the latest sandbox build (2026.1.6822). If there is any problem, please let me know.
LinkShape being ignored in Scheduler
Answered: This is a global property that should be set in the Scheduler config (see linkShape in the API docs), rather than in individual link properties.
Month.makeDraggable doc and Typescript types missing
Answered: The TypeScript definition for DayPilot.Month.makeDraggable() is now available in the latest sandbox build (2026.1.6821). The API has been extended with additional options to match the Calendar compon...
How to fire onTimeRangeSelect/ed events for disabled cells
Answered: You can use the onTimeRangeSelecting event to set args.ignoreDisabledCells to true when you want to allow the time range selection.
Recurring Activities
Answered: The JavaScript version doesn’t have built-in support for recurring events. You need to implement this feature on the server side and pass the full list of occurrences to the component on the client s...
Event Slot not always displayed in schedule in vue3 wrapper
Answered: This should be fixed now in the latest sandbox build (2025.4.772, NPM). It only happens with floating events enabled, so the workaround for the current release would be to disable this feature. Pleas...
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