Recurrence editor in Angular Schedule component

11 Jul 202422 minutes to read

The Recurrence editor is integrated into Scheduler editor window by default, to process the recurrence rule generation for events. Apart from this, it can also be used as an individual component referring from the Scheduler repository to work with the recurrence related processes.

All the valid recurrence rule string mentioned in the iCalendar specifications are applicable to use with the recurrence editor.

Customizing the repeat type option in editor

By default, there are 5 types of repeat options available in recurrence editor such as,

Never
Daily
Weekly
Monthly
Yearly

It is possible to customize the recurrence editor to display only the specific repeat options such as Daily and Weekly options alone by setting the appropriate frequencies option.

app.component.ts
main.ts
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { ScheduleModule } from '@syncfusion/ej2-angular-schedule'
import { ButtonModule } from '@syncfusion/ej2-angular-buttons'
import { DayService, WeekService, WorkWeekService, MonthService, AgendaService, MonthAgendaService} from '@syncfusion/ej2-angular-schedule'



import { Component, ViewChild} from '@angular/core';
import { EventSettingsModel, PopupOpenEventArgs, ScheduleComponent } from '@syncfusion/ej2-angular-schedule';
import { scheduleData } from './datasource';

@Component({
imports: [
        
        ScheduleModule,
        ButtonModule
    ],

providers: [DayService, 
                WeekService, 
                WorkWeekService, 
                MonthService,
                AgendaService,
                MonthAgendaService],
standalone: true,
  selector: 'app-root',
  // specifies the template string for the Schedule component
  template: `<ejs-schedule #scheduleObj width='100%' height='550px' [selectedDate]='selectedDate'
  [eventSettings]='eventSettings' (popupOpen)='onPopupOpen($event)'>
  </ejs-schedule>`
})
export class AppComponent {
  @ViewChild('scheduleObj')
  public scheduleObj?: ScheduleComponent;
  public selectedDate: Date = new Date(2018, 1, 15);
  public eventSettings: EventSettingsModel = { dataSource: scheduleData };
  onPopupOpen(args: PopupOpenEventArgs): void {
    if (args.type == 'Editor') {
        (<any>this.scheduleObj!.eventWindow).recurrenceEditor.frequencies = ['daily', 'weekly'];
    }
  }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

The other properties available in recurrence editor are tabulated below,

Properties	Type	Description
firstDayOfWeek	number	Sets the first day of the week on recurrence editor.
startDate	Date	Sets the start date from which date the recurrence event starts.
dateFormat	string	Sets the specific date format on recurrence editor.
locale	string	Sets the locale to be applied on recurrence editor.
cssClass	string	Allows styling to be applied on recurrence editor with custom class names.
enableRtl	boolean	Allows recurrence editor to render in RTL mode.
minDate	Date	Sets the minimum date on recurrence editor.
maxDate	Date	Sets the maximum date on recurrence editor.
value	string	Sets the recurrence rule value on recurrence editor.
selectedType	number	Sets the specific repeat type on the recurrence editor.

Customizing the End Type Option in Editor

By default, there are 3 types of end options available in the recurrence editor such as:

Never
Until
Count

It is possible to customize the recurrence editor to display only the specific end options, such as the Until and Count options alone, by setting the appropriate endTypes option.

app.component.ts
main.ts
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { RecurrenceEditorModule } from '@syncfusion/ej2-angular-schedule'
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns'

import { Component, ViewChild } from '@angular/core';
import { RecurrenceEditorComponent } from '@syncfusion/ej2-angular-schedule';
@Component({
imports: [
        
        RecurrenceEditorModule,
        DropDownListAllModule
    ],
standalone: true,
  selector: 'app-root',
  template: `<ejs-recurrenceeditor #recurrenceObj></ejs-recurrenceeditor>`
})
export class AppComponent {
  @ViewChild('recurrenceObj')
  public recurrenceObj?: RecurrenceEditorComponent;
  ngAfterViewInit() {
    (this.recurrenceObj as RecurrenceEditorComponent ).selectedType = 1;
    (this.recurrenceObj as RecurrenceEditorComponent | any ).endTypes = ['until', 'count'];
  }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Accessing the recurrence rule string

The recurrence rule is usually generated based on the options selected from the recurrence editor and also it follows the iCalendar specifications. The generated recurrence rule string is a valid one to be used with the Scheduler event’s recurrence rule field.

There is a change event available in recurrence editor, that triggers on every time the fields of recurrence editor tends to change. Within this event argument, you can access the generated recurrence value through the value option as shown in the following code example.

app.component.ts
main.ts
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { RecurrenceEditorModule } from '@syncfusion/ej2-angular-schedule'
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns'



import { Component} from '@angular/core';
import { RecurrenceEditorChangeEventArgs } from '@syncfusion/ej2-angular-schedule';
import { isNullOrUndefined } from "@syncfusion/ej2-base";

@Component({
imports: [
        
        RecurrenceEditorModule,
        DropDownListAllModule
    ],
standalone: true,
  selector: 'app-root',
  // specifies the template string for the Schedule component
  template: `<div style="padding-bottom:15px;">
            <label id="rule-label">Rule Output</label>
            <div class="rule-output-container">
                <div id="rule-output"></div>
            </div>
        </div>
        <ejs-recurrenceeditor (change)="onChange($event)"></ejs-recurrenceeditor>
        `
})
export class AppComponent {
  public selectRule: string = 'Select Rule';
  onChange(args: RecurrenceEditorChangeEventArgs): void {
    if (!isNullOrUndefined(args.value)) {
        if(args.value == "") {
            this.selectRule = 'Select Rule';
        } else {
            this.selectRule = args.value;
        }
    }
  }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Set specific value on recurrence editor

It is possible to display the recurrence editor with specific options loaded initially, based on the rule string that we provide. The fields of recurrence editor will change its values accordingly, when we provide a particular rule through the setRecurrenceRule method.

app.component.ts
main.ts
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { RecurrenceEditorModule } from '@syncfusion/ej2-angular-schedule'
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns'



import { Component } from '@angular/core';
import { isNullOrUndefined } from '@syncfusion/ej2-base';
import { RecurrenceEditorChangeEventArgs } from '@syncfusion/ej2-angular-schedule';

@Component({
imports: [
        
        RecurrenceEditorModule,
        DropDownListAllModule
    ],
standalone: true,
    selector: 'app-root',
    // specifies the template string for the Schedule component
    template: `<div class="content-wrapper recurrence-editor-wrap">
  <div style="padding-bottom:15px;">
      <label>Rule Output</label>
      <div class="rule-output-container">
          <div id="rule-output"></div>
      </div>
  </div>
  <ejs-recurrenceeditor (change)="onChange($event)" value="FREQ=DAILY;INTERVAL=2;COUNT=8"></ejs-recurrenceeditor>
</div>`
})
export class AppComponent {
    public selectRule: string = 'FREQ=DAILY;INTERVAL=2;COUNT=8';
    public onChange(args: RecurrenceEditorChangeEventArgs): void {
        if (!isNullOrUndefined(args.value)) {
            this.selectRule = args.value;
        }
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Recurrence date generation

You can parse the recurrenceRule of an event to generate the date instances on which that particular event is going to occur, using the getRecurrenceDates method. It generates the dates based on the recurrenceRule that we provide. The parameters to be provided for getRecurrenceDates method are as follows.

Field name	Type	Description
`startDate`	Date	Appointment start date.
`rule`	String	Recurrence rule present in an event object.
`excludeDate`	String	Date collection (in ISO format) to be excluded. It is optional.
`maximumCount`	Number	Number of date count to be generated. It is optional.
`viewDate`	Date	Current view range’s first date. It is optional.

app.component.ts
main.ts
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { RecurrenceEditorModule } from '@syncfusion/ej2-angular-schedule'
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns'



import { Component, ViewChild } from '@angular/core';
import { RecurrenceEditor, RecurrenceEditorChangeEventArgs } from '@syncfusion/ej2-angular-schedule';
import { isNullOrUndefined } from '@syncfusion/ej2-base';

@Component({
imports: [
        
        RecurrenceEditorModule,
        DropDownListAllModule
    ],
standalone: true,
    selector: 'app-root',
    // specifies the template string for the Schedule component
    template: `<div style="padding-bottom:15px;">
    <label id="rule-label">Date Collections</label>
    <div class="rule-output-container">
        <div id="rule-output">
        <div  *ngFor="let date of dateArray"></div>
        </div>
    </div>
  </div>
  <ejs-recurrenceeditor #recurrenceObj [value]="value" (change)="onChange($event)"></ejs-recurrenceeditor>`
})
export class AppComponent {
    @ViewChild('recurrenceObj') public recObject: RecurrenceEditor;
    public value = 'FREQ=DAILY;INTERVAL=1';
    public dateArray: string[] = [];
    public selectRule: string = 'Select Rule';

    onChange(args: RecurrenceEditorChangeEventArgs): void {
        if (!isNullOrUndefined(args.value)) {
            this.dateArray = [];
            if (args.value == '') {
                this.dateArray.push(this.selectRule.toString());
            } else {
                let dates: number[] = this.recObject.getRecurrenceDates(
                    new Date(),
                    args.value
                );
                for (let i: number = 0; i < dates.length; i++) {
                    this.dateArray.push(new Date(dates[i]).toString());
                }
            }
        }
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Above example will generate two dates January 7, 2018 & January 9 2018 by excluding the in between dates January 8 2018 & January 10 2018, since those dates were given in the exclusion list. Generated dates can then be utilised to create appointments.

Recurrence date generation in server-side

It is also possible to generate recurrence date instances from server-side by manually referring the RecurrenceHelper class, which is specifically written and referred from application end to handle this date generation process.

Refer here for the step by step procedure to achieve date generation in server-side.

Restrict date generation with specific count

In case, if the rule is given in “NEVER ENDS” category, then you can mention the maximum count when you actually want to stop the date generation starting from the provided start date. To do so, provide the appropriate maximumCount value within the getRecurrenceDates method as shown in the following code example.

app.component.ts
main.ts
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { RecurrenceEditorModule } from '@syncfusion/ej2-angular-schedule'
import { DropDownListAllModule } from '@syncfusion/ej2-angular-dropdowns'
import { NumericTextBoxAllModule } from '@syncfusion/ej2-angular-inputs'



import { Component, OnInit } from '@angular/core';
import { RecurrenceEditor } from '@syncfusion/ej2-angular-schedule';
import { ChangeEventArgs } from '@syncfusion/ej2-angular-inputs';
import { isNullOrUndefined } from '@syncfusion/ej2-base';

@Component({
imports: [
        
        RecurrenceEditorModule,
        DropDownListAllModule,
        NumericTextBoxAllModule
    ],
standalone: true,
    selector: 'app-root',
    // specifies the template string for the Schedule component
    template: `<div style="padding-bottom:15px;">
    <label id="rule-label">Date Collections</label>
    <div class="rule-output-container">
        <div id="rule-output">
        <div  *ngFor="let date of dateArray"></div>
        </div>
    </div>
  </div>
  <ejs-numerictextbox [(value)]='numericValue' (change)= "onChange($event)"></ejs-numerictextbox>`
})
export class AppComponent implements OnInit {
    public ruleString = 'FREQ=DAILY;INTERVAL=1';
    public numericValue: number = 10;
    public dateArray: string[] = [];
    public recObject: RecurrenceEditor = new RecurrenceEditor();
    ngOnInit(): void {
        let dates: number[] = this.recObject.getRecurrenceDates(
            new Date(2018, 0, 7, 10, 0),
            this.ruleString,
            '20180108T114224Z,20180110T114224Z',
            this.numericValue,
            new Date(2018, 0, 7)
        );
        for (let i: number = 0; i < dates.length; i++) {
            this.dateArray.push(new Date(dates[i]).toString());
        }
    }
    onChange(args: ChangeEventArgs) {
        if (!isNullOrUndefined(args.value)) {
            this.dateArray = [];
            let dates: number[] = this.recObject.getRecurrenceDates(
                new Date(2018, 0, 7, 10, 0),
                this.ruleString,
                '20180108T114224Z,20180110T114224Z',
                args.value,
                new Date(2018, 0, 7)
            );
            for (let i: number = 0; i < dates.length; i++) {
                this.dateArray.push(new Date(dates[i]).toString());
            }
        }
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

You can refer to our Angular Scheduler feature tour page for its groundbreaking feature representations. You can also explore our Angular Scheduler example to knows how to present and manipulate data.