calendar-builder 📆

> All the logic you need to quickly build a custom calendar or date-picker for any framework or plain vanilla JavaScript.

Features

• Generates data to populate a grid
• Split your events by date
• Supports fill or fitted weeks (filled weeks always shows 6 weeks)
• Supports before and after date
• Supports start of week
• Supports range selection
• Supports disabling certains days
• Supports disabling days of the week

Feature	Example
Plain	Today is marked with a dot
First day of week	First day of week is now 'Sunday' (default)
Selection: single
Selection: range
After	Only dates after the 12th of May 2021 are valid
Before	Only dates before the 14th of May 2021 are valid
Disable days of week	Tuesdays and Thursdays are disabled
Disable specific days	The days: 11, 12, 13, and 18 are disabled

Example usage

const options = {
  firstDay: 1 // Monday
}

let calendar = create(Date.now(), options)

const nextMonth = () => {
  calendar = create(calendar.next, options)
}

const prevMonth = () => {
  calendar = create(calendar.prev, options)
}

Output

Sample output from calling create()

Options

Note that the

• month in CalendarDate is 1-based and that,
• day is what is called 'date' in the Date APi.

type CalendarDate =
  | { year: number; month: number; day?: number }
  | string
  | number
  | Date;

interface CalendarEvent {
  label: string,
  date: Date
  value?: T
}

type CalendarBuilderOptions = {
  /**
   * The first day of the week
   *
   * Default: 0
   */
  firstDay: number;
  /**
   * Add a fill week to the end even if not needed. This is useful to avoid
   * "flicker" when some months are 4-6 weeks only.
   *
   * Default: true
   */
  fillWeek: boolean;
  /**
   * Mark dates before this time invalid (excluding)
   *
   * E.g. after = 2021-05-29, then first valid date is 2021-05-30.
   */
  after: CalendarDate;
  /**
   * Mark dates after this time invalid (excluding)
   *
   * E.g. before = 2021-05-29, then last valid date is 2021-05-28.
   */
  before: CalendarDate;
  /**
   * Mark days in this range as selected. The selection state of the day may
   * vary if it is the first, last, middle, or only day in the selection.
   */
  selection: [CalendarDate, CalendarDate];
  /**
   * Optionally pas in date for when is 'now'.
   */
  now: CalendarDate;
  /**
   * Disable days of the week
   */
  disableDaysOfWeek: number[];
  /**
   * Disable specific days
   */
  disableDays: CalendarDate[];
  /**
   * Events to "bucket". Will distribute an array of events into the
     event-bucket on each of the calendar days.
   */
  events: CalendarEvent[];
};