Prevent Past Event Creation

Sometimes we don't want users to be able to create events in the past or to alter past events. This might be role based in some cases or applied in general to the calendar.

To disable past event creation and manipulation, a couple of things need to be handled:

  • Invalidate past dates & times - this takes care of validating event drop and event creation on past dates and times that are before the past hour
  • Mark past events as fixed - to do this, set the editable property of the event object to false for the events that should remain fixed
  • Handle past occurrences of recurring events - recurring events are loaded as a single event and the occurrences are generated by the scheduler.

Moving the past occurrences need to be handled in the onEventUpdate and onEventCreate lifecycle events

  • Give feedback to the user - optionally, a toast can be displayed to give feedback to the user why an event cannot be dropped, moved and created in the past. For this we can use the onEventCreateFailed and onEventUpdateFailed lifecycle events
Get started with this example

Demo

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Block event creation and editing on past dates in the Scheduler — past dates are blocked, past events are locked, and failed attempts show a toast.

Code

View code on GitHub 
import { CommonModule } from '@angular/common';
import { HttpClient } from '@angular/common/http';
import { Component, OnInit } from '@angular/core';
import { MbscCalendarEvent, MbscEventcalendarOptions, MbscModule, Notifications, setOptions  } from '@mobiscroll/angular';

setOptions({
  locale:  ,
  theme: ' ',
  themeVariant: ' '
});

const now = new Date();
const today = new Date(now.setMinutes(59));
const yesterday = new Date(now.getFullYear(), now.getMonth(), now.getDate() - 1);

@Component({
  selector: 'app-root', 
  templateUrl: './app.component.html',
  providers: [Notifications],
  standalone: true,
  imports: [CommonModule, MbscModule],
})
export class AppComponent implements OnInit {
  constructor(
    private http: HttpClient,
    private notify: Notifications,
  ) {}

  myEvents: MbscCalendarEvent[] = [];

  eventSettings: MbscEventcalendarOptions = {
    view: {
      scheduler: {
        type: 'week',
      },
    },
    invalid: [
      {
        recurring: {
          repeat: 'daily',
          until: yesterday,
        },
      },
      {
        start: yesterday,
        end: today,
      },
    ],
    clickToCreate: true,
    dragToCreate: true,
    dragToMove: true,
    dragToResize: true,
    onEventCreateFailed: (args) => {
      if (!args.originEvent) {
        this.notify.toast({
          message: "Can't create event in the past",
        });
      }
    },
    onEventUpdateFailed: (args) => {
      if (!args.oldEventOccurrence) {
        this.notify.toast({
          message: "Can't move event in the past",
        });
      }
    },
    onEventCreate: (args) => {
      const oldEvent = args.originEvent;
      const start = oldEvent && oldEvent.start ? oldEvent.start : null;

      // Handle recurring events
      if (start && start < today) {
        this.notify.toast({
          message: "Can't move past event",
        });
        return false;
      } else {
        return true;
      }
    },
    onEventUpdate: (args) => {
      const oldEvent = args.oldEvent;
      const start = oldEvent && oldEvent.start ? oldEvent.start : null;
      const oldEventOccurrence = args.oldEventOccurrence;
      const occurrenceStart = oldEventOccurrence && oldEventOccurrence.start ? oldEventOccurrence.start : null;

      // Handle recurring events
      if ((start && start < today) || (occurrenceStart && occurrenceStart < today)) {
        return false;
      } else {
        return true;
      }
    },
  };

  ngOnInit(): void {
    this.http.jsonp<MbscCalendarEvent[]>('https://trial.mobiscroll.com/events/?vers=5', 'callback').subscribe((events: any) => {
      for (const event of events) {
        // Convert dates to date objects
        event.start = event.start ? new Date(event.start) : event.start;
        event.end = event.end ? new Date(event.end) : event.end;
        // Mark past events as fixed by setting the event.editable property to false
        event.editable = event.start && today < event.start;
      }
      this.myEvents = events;
    });
  }
}

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