Ionic2-Calendar directive

Ionic2 calendar directive

Demo

https://twinssbc.github.io/Ionic2-Calendar/demo/

Dependency

The latest version has below dependency:
intl 1.2.5, due to issue angular/angular#3333

version 0.1.x depends on Ionic 2.0.0-rc.1 ~ Ionic 2.0.0-rc.4
version 0.2.x depends on Ionic 2.0.0-rc.5 (rc.5 has breaking change on the slide API) and 2.0.0 final version onwards. version 0.2.9+ depends on Ionic 2.3.0 version onwards.
version 0.3.x depends on Ionic 3.1.1 version onwards.

Usage

Install: npm install ionic2-calendar --save

Import the ionic2-calendar module:

import { NgModule } from '@angular/core';
import { IonicApp, IonicModule } from 'ionic-angular';
import { MyApp } from './app/app.component';
import { NgCalendarModule  } from 'ionic2-calendar';


@NgModule({
    declarations: [
        MyApp
    ],
    imports: [
        NgCalendarModule,
        IonicModule.forRoot(MyApp)
    ],
    bootstrap: [IonicApp],
    entryComponents: [
        MyApp
    ]
})
export class AppModule {}

Add the directive in the html page

      <calendar [eventSource]="eventSource"
        [calendarMode]="calendar.mode"
        [currentDate]="calendar.currentDate"
        (onCurrentDateChanged)="onCurrentDateChanged($event)"
        (onRangeChanged)="reloadSource(startTime, endTime)"
        (onEventSelected)="onEventSelected($event)"
        (onTitleChanged)="onViewTitleChanged($event)"
        (onTimeSelected)="onTimeSelected($event)"
        step="30">
      </calendar>

Note for Ionic Build/Run command

ionic serve uses tsc to compile the code, while ionic build/run uses ngc to compile the code.
It requires explicit dependency on the compiled ngfactory files for each component.
I couldn’t find a way to configure the build command includes the ngfactory of the child components automatically.
So the workaround is to import them explicitly.
Add below lines in main.prod.ts

import { CalendarComponent } from 'ionic2-calendar/calendar';
import { MonthViewComponent } from 'ionic2-calendar/monthview';
import { WeekViewComponent } from 'ionic2-calendar/weekview';
import { DayViewComponent } from 'ionic2-calendar/dayview';

Options

• formatDay
  The format of the date displayed in the month view.
  Default value: 'dd'

• formatDayHeader
  The format of the header displayed in the month view.
  Default value: 'EEE'

• formatDayTitle
  The format of the title displayed in the day view.
  Default value: 'MMMM dd, yyyy'

• formatWeekTitle
  The format of the title displayed in the week view.
  Default value: 'MMMM yyyy, Week $n’

• formatMonthTitle
  The format of the title displayed in the month view.
  Default value: 'MMMM yyyy'

• formatWeekViewDayHeader
  The format of the header displayed in the week view.
  Default value: 'EEE d'

• formatHourColumn
  The format of the hour column displayed in the week and day view.
  Default value: ‘j’

• calendarMode
  The initial mode of the calendar.
  Default value: 'month'

• showEventDetail
  If set to true, when selecting the date in the month view, the events happened on that day will be shown below.
  Default value: true

• startingDayMonth
  Control month view starting from which day.
  Default value: 0

• startingDayWeek
  Control week view starting from which day.
  Default value: 0

• allDayLabel
  The text displayed in the allDay column header.
  Default value: ‘all day’

• noEventsLabel
  The text displayed when there’s no event on the selected date in month view.
  Default value: ‘No Events’

• eventSource
  The data source of the calendar, when the eventSource is set, the view will be updated accordingly.
  Default value: null
  The format of the eventSource is described in the EventSource section

• queryMode
  If queryMode is set to 'local', when the range or mode is changed, the calendar will use the already bound eventSource to update the view
  If queryMode is set to 'remote', when the range or mode is changed, the calendar will trigger a callback function rangeChanged.
  Users will need to implement their custom loading data logic in this function, and fill it into the eventSource. The eventSource is watched, so the view will be updated once the eventSource is changed.
  Default value: 'local'

• step
  It can be set to 15 or 30, so that the event can be displayed at more accurate position in weekview or dayview.
  Default value: 60

• autoSelect
  If set to true, the current calendar date will be auto selected when calendar is loaded or swiped in the month view.
  Default value: true

• markDisabled
  The callback function used to determine if the time should be marked as disabled.

    <calendar ... [markDisabled]=“markDisabled”></calendar>
  
    markDisabled = (date: Date) => {
        var current = new Date();
        return date < current;
    };
  

• dateFormatter
  The custom date formatter to transform date to text.
  If the custom date formatter is not set, the default Angular DatePipe is used. The format method in dateFormatter is optional, if omitted, the default Angular DatePipe is used.

    <calendar ... [dateFormatter]="calendar.dateFormatter"></calendar>
  
    calendar = {
        dateFormatter: {
            formatMonthViewDay: function(date:Date) {
                return date.getDate().toString();
            },
            formatMonthViewDayHeader: function(date:Date) {
                return ‘testMDH’;
            },
            formatMonthViewTitle: function(date:Date) {
                return 'testMT';
            },
            formatWeekViewDayHeader: function(date:Date) {
                return ‘testWDH’;
            },
            formatWeekViewTitle: function(date:Date) {
                return 'testWT’;
            },
            formatWeekViewHourColumn: function(date:Date) {
                return 'testWH’;
            },
            formatDayViewHourColumn: function(date:Date) {
                return 'testDH’;
            },
            formatDayViewTitle: function(date:Date) {
                return 'testDT’;
            }
        }
    };        
  

• dir
  If set to “rtl”, the calendar supports RTL language. This feature is only supported in Ionic 2.3.0 version onwards.
  Default value: “”

• scrollToHour
  Make weekview and dayview scroll to the specific hour after entering to the new view.
  Default value: 0

• preserveScrollPosition
  If set to true, the previous/next views in weekview and dayview will also scroll to the same position as the current active view.
  Default value: false

• onCurrentDateChanged
  The callback function triggered when the date that is currently viewed changes.

    <calendar ... (onCurrentDateChanged)="onCurrentDateChanged($event)"></calendar>
  
    onCurrentChanged = (ev: Date) => {
        console.log('Currently viewed date: ' + ev);
    };
  

• onRangeChanged
  The callback function triggered when the range or mode is changed if the queryMode is set to 'remote'
  The ev parameter contains two fields, startTime and endTime.

    <calendar ... (onRangeChanged)="onRangeChanged($event)"></calendar>
  
    onRangeChanged = (ev: { startTime: Date, endTime: Date }) => {
        Events.query(ev, (events) => {
            this.eventSource = events;
        });
    };
  

• onEventSelected
  The callback function triggered when an event is clicked

    <calendar ... (onEventSelected)="onEventSelected($event)"></calendar>
  
    onEventSelected = (event) => {
        console.log(event.title);
    };
  

• onTimeSelected
  The callback function triggered when a date is selected in the monthview.
  The ev parameter contains two fields, selectedTime and events, if there's no event at the selected time, the events field will be either undefined or empty array

    <calendar ... (onTimeSelected)="onTimeSelected($event)"></calendar>
  
    onTimeSelected = (ev: { selectedTime: Date, events: any[] }) => {
        console.log('Selected time: ' + ev.selectedTime + ', hasEvents: ' + (ev.events !== undefined && ev.events.length !== 0));
    };
  

• onTitleChanged
  The callback function triggered when the view title is changed

    <calendar ... (onTitleChanged)="onViewTitleChanged($event)”></calendar>
  
    onViewTitleChanged = (title: string) => {
        this.viewTitle = title;
    };
  

View Customization Option

Note: For any css class appear in the customized template, you need to specify the styles by yourself. The styles defined in the calendar component won’t be applied because of the view encapsulation.

• monthviewDisplayEventTemplate
  Type: TemplateRef<IMonthViewDisplayEventTemplateContext>
  The template provides customized view for event displayed in the active monthview

    <template #template let-view="view" let-row="row" let-col="col">
        {{view.dates[row*7+col].label}}
    </template>
  
    <calendar ... [monthviewDisplayEventTemplate]="template"></calendar>
  

• monthviewInactiveDisplayEventTemplate
  Type: TemplateRef<IMonthViewDisplayEventTemplateContext>
  The template provides customized view for event displayed in the inactive monthview

    <template #template let-view="view" let-row="row" let-col="col">
        {{view.dates[row*7+col].label}}
    </template>
  
    <calendar ... [monthviewInactiveDisplayEventTemplate]="template"></calendar>
  

• monthviewEventDetailTemplate
  Type: TemplateRef<IMonthViewEventDetailTemplateContext>
  The template provides customized view for event detail section in the monthview

    <template #template let-showEventDetail="showEventDetail" let-selectedDate="selectedDate" let-noEventsLabel="noEventsLabel">
    ... 
    </template>
  
    <calendar ... [monthviewEventDetailTemplate]="template"></calendar>
  

• weekviewAllDayEventTemplate
  Type: TemplateRef<IDisplayAllDayEvent>
  The template provides customized view for all day event in the weekview

    <template #template let-displayEvent="displayEvent">
        <div class="calendar-event-inner">{{displayEvent.event.title}}</div>
    </template>
  
    <calendar ... [weekviewAllDayEventTemplate]="template"></calendar>
  

• weekviewNormalEventTemplate
  Type: TemplateRef<IDisplayEvent>
  The template provides customized view for normal event in the weekview

    <template #template let-displayEvent="displayEvent">
        <div class="calendar-event-inner">{{displayEvent.event.title}}</div>
    </template>
  
    <calendar ... [weekviewNormalEventTemplate]="template"></calendar>
  

• dayviewAllDayEventTemplate
  Type: TemplateRef<IDisplayAllDayEvent>
  The template provides customized view for all day event in the dayview

    <template #template let-displayEvent="displayEvent">
        <div class="calendar-event-inner">{{displayEvent.event.title}}</div>
    </template>
  
    <calendar ... [dayviewAllDayEventTemplate]="template"></calendar>
  

• dayviewNormalEventTemplate
  Type: TemplateRef<IDisplayEvent>
  The template provides customized view for normal event in the dayview

    <template #template let-displayEvent="displayEvent">
        <div class="calendar-event-inner">{{displayEvent.event.title}}</div>
    </template>
  
    <calendar ... [dayviewNormalEventTemplate]="template"></calendar>
  

EventSource

EventSource is an array of event object which contains at least below fields:

• title

• startTime
  If allDay is set to true, the startTime has to be as a UTC date which time is set to 0:00 AM, because in an allDay event, only the date is considered, the exact time or timezone doesn't matter.
  For example, if an allDay event starting from 2014-05-09, then startTime is

    var startTime = new Date(Date.UTC(2014, 4, 8));
  

• endTime
  If allDay is set to true, the startTime has to be as a UTC date which time is set to 0:00 AM, because in an allDay event, only the date is considered, the exact time or timezone doesn't matter.
  For example, if an allDay event ending to 2014-05-10, then endTime is

    var endTime = new Date(Date.UTC(2014, 4, 9));
  

• allDay
  Indicates the event is allDay event or regular event

Localization

The DatePipe relies on LOCALE_ID to achieve localization. By default, the LOCALE_ID is en-US. You can override it in the module as below. If you pass undefined, the LOCALE_ID will be detected using the browser language setting. But using explicit value is recommended, as browser has different level of localization support.

import { NgModule, LOCALE_ID } from '@angular/core';

@NgModule({
    …
    providers: [
        { provide: LOCALE_ID, useValue: ‘zh-CN’ }
    ]
})

Performance Tuning

In the CPU profile, the default Intl based localization code occupies a big portion of the execution time. If you don’t need localization on certain parts, you can use the custom dateFormatter to override the date transform method. For example, the date in month view usually doesn’t require localization, you could use below code to just display the date part. If the month view day header doesn’t need to include the date, you could also use a string array containing static labels to save the date calculation.

<calendar ... [dateFormatter]="calendar.dateFormatter"></calendar>

calendar = {
    dateFormatter: {
        formatMonthViewDay: function(date:Date) {
            return date.getDate().toString();
        }            
    }
};

Known issue

This component updates the ion-slide dynamically so that only 3 looped slides are needed.
The ion-slide in Ionic2 uses Swiper. It seems in the Swiper implementation, the next slide after the end of looped slide is a separate cached slide, instead of the first slide.
I can't find out a way to force refresh that cached slide, so you will notice that when sliding from the third month to the forth month, the preview month is not the forth month, but the first month.
Once the sliding is over, the slide will be forced to render the forth month.

Common Questions

• Error: Cannot find module "intl"
  Answer: This calendar has dependency on 'Intl'. Run npm install intl@1.2.5 to install the dependency

• Error: Cannot read property 'getFullYear' of undefined
  Answer: If you bind currentDate like this: [currentDate]="calendar.currentDate". You need to assign calendar.currentDate a valid Date object

• How to switch the calendar to previous/next month programmatically?
  Answer: You can change currentDate to the date in previous/next month.