Create event only by clicking (Calendar)

If you click a calendar cell, it will fire onTimeRangeSelect (and onTimeRangeSelected) event handler where you can create a new event. This works in both versions (Lite and Pro).

To make sure only a 30-minute event (for example) is created, you can use a calculated end instead of the provided args.end.

onTimeRangeSelected: args => {
  dp.events.add({
    start: args.start,
    end: args.start.addMinutes(30),
    // ...
  });
}

In the Pro (paid) version, you can prevent a selection of multiple cells using onTimeRangeSelecting (since 2023.1.5536):

onTimeRangeSelecting: args => {
    if (args.anchor === args.start) {
        args.end = args.start.addMinutes(30);
    }
    else {
        args.start = args.end.addMinutes(-30);
    }
}

This will modify the visible selection and onTimeRangeSelected will receive the modified range.

See also:
https://api.daypilot.org/daypilot-calendar-ontimerangeselecting/

The onTimeRangeDoubleClicked event only works on an existing selection and is only available in the Pro version.