Select a sequence of dates in Calendar in Angular Calendar component

import { Component, ViewChild } from '@angular/core';
import { CalendarComponent } from '@syncfusion/ej2-angular-calendars';
import moment from 'moment';

@Component({
    selector: 'app-root',
    styleUrls: ['styles.css'],
    template: `
        <!-- Rendering the Calendar with Multi selection option--->
        <div class="wrapelement">
            <ejs-calendar #ejCalendar id="calendar" isMultiSelection='true' (change)="onChange($event)"></ejs-calendar>
            </div>
            <div class='btncontainer e-btn-group e-vertical'>
            <input type="radio" id="workweek" name="week" value="workweek" (click)="workWeek()" />
            <label class="e-btn" for="workweek">Work Week</label>
            <input type="radio" id="week" name="week" value="week" (click)="week()"/>
            <label class="e-btn" for="week">Week</label>
            </div>
        `
})
export class AppComponent {
    @ViewChild('ejCalendar')
    public CalendarInstance: CalendarComponent;
    /*selected current week dates when click the button*/
    workWeek() {
        if (this.CalendarInstance.element.classList.contains('week')) {
            this.CalendarInstance.element.classList.remove('week')
        }
        this.CalendarInstance.element.classList.add('workweek');
    }

    week() {
        if (this.CalendarInstance.element.classList.contains('workweek')) {
            this.CalendarInstance.element.classList.remove('workweek')
        }
        this.CalendarInstance.element.classList.add('week');
    }

    onChange(args) {
        var startOfWeek = moment(args.value).startOf('week');
        var endOfWeek = moment(args.value).endOf('week');
        if (this.CalendarInstance.element.classList.contains('workweek')) {
            getWeekArray(startOfWeek.day(1), endOfWeek.day(5), this);
        } else if (this.CalendarInstance.element.classList.contains("week")) {
            getWeekArray(startOfWeek, endOfWeek, this);
        }
    }

    getWeekArray(startOfWeek, endOfWeek, obj) {
        var days = [];
        var day = startOfWeek;
        while (day <= endOfWeek) {
            days.push(day.toDate());
            day = day.clone().add(1, 'd');
        }
        obj.CalendarInstance.values = days;
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
//Syncfusion ej2-ng-calendars module
import { CalendarModule } from '@syncfusion/ej2-ng-calendars';
import { AppComponent } from './app.component';
import moment from 'moment';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        CalendarModule //declaration of ej2-ng-calendars module into NgModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

/* Example -styles */

#container {
    visibility: hidden;
}

#loader {
    color: #008cff;
    height: 40px;
    width: 30%;
    position: absolute;
    top: 45%;
    left: 45%;
}

#element {
    display: block;
    height: 350px;
}

#wrapper {
    width: 450px;
    margin: 0 auto;
}

.wrapelement, .btncontainer {
    display: inline-block;
}

.btncontainer{
    display: inline-flex;
    margin: 120px 0 0 85px;
    float: right;
}