Frequently asked questions in Angular Schedule component

19 Sep 20225 minutes to read

In this article, you can find some frequently asked questions and corresponding solutions while getting hands-on experience with scheduler control.

Maximum call stack size exceeded

Error Image:

Maximum call stack size exceeded


The above error occurs when using scheduler views that were not imported into the project. You can resolve this issue by importing the required view modules.

In the below code, Day option is used without injecting, So, it throws the above error. You can resolve this problem by simply injecting the day module in below code.

import { Component } from '@angular/core';
import { AgendaService, TimelineViewsService, TimelineMonthService, EventSettingsModel } from '@syncfusion/ej2-angular-schedule';

    selector: "app-root",
    providers: [ AgendaService, TimelineViewsService, TimelineMonthService],
    // specifies the template string for the Schedule component
    template: `
    <ejs-schedule width="100%" height="550px" [selectedDate]="selectedDate" [views]="views"
        <e-resource field="OwnerId" title="Owner" name="Owners"
          [dataSource]="ownerDataSource" [allowMultiple]="allowMultipleOwner"
          textField="OwnerText" idField="Id" colorField="OwnerColor">
export class AppComponent {
    public selectedDate: Date = new Date(2021, 7, 1);
    // Day view service not imported but still used
    public views: Array<string> = ['Day', 'TimelineWeek', 'TimelineMonth', 'Agenda'];
    public eventSettings: EventSettingsModel = {
        dataSource: resourceData
    public allowMultipleOwner: Boolean = true;
    public ownerDataSource: Object[] = [
        { OwnerText: 'Nancy', Id: 1, OwnerColor: '#ffaa00' },
        { OwnerText: 'Steven', Id: 2, OwnerColor: '#f8a398' },
        { OwnerText: 'Michael', Id: 3, OwnerColor: '#7499e1' }

If ScheduleAllModule was injected from module files, the above issue is not thrown.

Grouping with empty resources

Grouping without providing any resource data will throw the following problems.

  • Normal(vertical) views are rendered, but you are not able to perform CRUD operations
  • Timeline views not at all render and shows empty scheduler table

So, we suggest to avoid grouping with empty resources in the scheduler.

Not providing e-field in editor template

Error: While using editor template, value of e-field is missing in editor window.

Solution: e-field value is mandatory, we need to add it. Please refer here for more info.

Missing CSS reference

Error Image:

Missing CSS reference


The above problem occurs when missing CSS references for the scheduler in a project. You can resolve this issue by providing proper CSS for the scheduler.

<!doctype html>
 <html lang="en">
  <meta charset="utf-8">
  <title>EJ2 Angular Schedule Sample</title>
      <! –– scheduler CSS is referred from this link ––>
  <link href="" rel="stylesheet">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">

QuickInfoTemplate at bottom

When using the quickInfoTemplate in scheduler, sometimes quickinfo popup not shown fully at the bottom area of scheduler. You can resolve this by using cellClick and eventClick events and below code snippet.

 template: "<ejs-schedule #schedule height="650px" (cellClick)="onClick($event)" (eventClick)="onClick($event)"></ejs-schedule>"
  public eventAdded: boolean = false;

  onClick(args: EventClickArgs): void {
    if (!this.eventAdded) {
      let popupInstance = (document.querySelector(".e-quick-popup-wrapper") as any).ej2_instances[0]; = () => {
      this.eventAdded = true;

Not importing culture files while using localization

Error Image:

Locale import issue

While using locale in scheduler, not importing the required culture files properly throws the problem.

Solution: Properly add and import the culture files(numberingSystems, timeZoneNames, loadCldr, L10n etc.,) in your project will resolve the problem.

import { loadCldr, L10n } from '@syncfusion/ej2-base';
import * as numberingSystems from './culture-files/numberingSystems.json';
import * as gregorian from './culture-files/ca-gregorian.json';
import * as numbers from './culture-files/numbers.json';
import * as timeZoneNames from './culture-files/timeZoneNames.json';

loadCldr(numberingSystems, gregorian, numbers, timeZoneNames);

  'en-GB': {
    schedule: {
      day: 'Day',
      week: 'Week',
      workWeek: 'Work Week',
      month: 'Month'