Milestone End Date Validation

[hugh.dent]

Hi,

We currently use the EndDate as the date for Milestones, since they're 0 duration, this updates the StartDate as well.
When moving the Milestone to a later date, this is fine.
However, it is giving an issue where we cannot change the Milestone date to any time earlier than it currently is.
Is there a way to allow this?

Screenshot 2025-05-13 104847.png (26.97 KiB) Viewed 66 times

This should be valid for Milestones and not give the minimum date error.

Kind Regards,
Hugh

[alex.l]

Hi Hugh,

Your request sounds reasonable to me. I've opened a ticket for that here https://github.com/bryntum/support/issues/11333
You can subscribe on ticket updates to be notified when it's done.

[hugh.dent]

Hi Alex,

Is there a current way to remove the check from certain rows?
A way to override it or stop it from firing?

[alex.l]

You can try to override min getter for EndDateField in EndDateColumn. Please review these 2 classes.
default code

    get min() {
        let min               = this._min;
        const eventStartDate  = this.eventRecord?.startDate;

    if (eventStartDate) {
        min = DateHelper.max(min || eventStartDate, eventStartDate);
    }

    return min;
}

Try to add https://bryntum.com/products/gantt/docs/api/Gantt/model/TaskModel#property-isMilestone check into it deicide if min is required to be set.
Here is how to override https://bryntum.com/products/gantt/docs/#Core/mixin/Override

[hugh.dent]

Hi Alex,

This seems to have worked. Thanks for your time

[alex.l]

Glad to hear! Good luck!