Show different types of Toast in React Toast component

import { ButtonComponent } from '@syncfusion/ej2-react-buttons';
import { ToastComponent } from '@syncfusion/ej2-react-notifications';
import * as React from "react";
import './App.css';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.toasts = [
            { title: 'Warning !', content: 'There was a problem with your network connection.', cssClass: 'e-toast-warning' },
            { title: 'Success !', content: 'Your message has been sent successfully.', cssClass: 'e-toast-success' },
            { title: 'Error !', content: 'A problem has been occurred while submitting your data.', cssClass: 'e-toast-danger' },
            { title: 'Information !', content: 'Please read the comments carefully.', cssClass: 'e-toast-info' }
        ];
        this.timeOutDelay = 600;
        this.toastFlag = 0;
        this.position = { X: 'Right', Y: 'Bottom' };
    }
    toastCreated() {
        this.toastInstance.show(this.toasts[this.toastFlag]);
        ++this.toastFlag;
    }
    toastShow() {
        setTimeout(() => {
            this.toastInstance.show(this.toasts[this.toastFlag]);
            ++this.toastFlag;
            if (this.toastFlag === (this.toasts.length)) {
                this.toastFlag = 0;
            }
        }, this.timeOutDelay);
    }
    btnClick() {
        this.toastShow();
    }
    render() {
        return (<div>
        <ButtonComponent cssClass="e-primary" onClick={this.btnClick = this.btnClick.bind(this)}> Show Toast </ButtonComponent>
        <ToastComponent ref={toast => this.toastInstance = toast} position={this.position} created={this.toastCreated = this.toastCreated.bind(this)}/>
      </div>);
    }
}
;
export default App;

import { ButtonComponent } from '@syncfusion/ej2-react-buttons';
import { ToastComponent  } from '@syncfusion/ej2-react-notifications';
import * as React from "react";
import './App.css';

class App extends React.Component<{}, {}> {
  public toastInstance: ToastComponent;
  public toasts = [
    { title: 'Warning !', content: 'There was a problem with your network connection.', cssClass: 'e-toast-warning' },
    { title: 'Success !', content: 'Your message has been sent successfully.', cssClass: 'e-toast-success' },
    { title: 'Error !', content: 'A problem has been occurred while submitting your data.', cssClass: 'e-toast-danger' },
    { title: 'Information !', content: 'Please read the comments carefully.', cssClass: 'e-toast-info' }
  ];
  public timeOutDelay: number = 600;
  public toastFlag: number = 0;
  public position = { X: 'Right', Y: 'Bottom' };

  public toastCreated(): void {
    this.toastInstance.show(this.toasts[this.toastFlag]);
    ++this.toastFlag;
  }

  public toastShow() {
    setTimeout(
      () => {
        this.toastInstance.show(this.toasts[this.toastFlag]);
        ++this.toastFlag;
        if (this.toastFlag === (this.toasts.length)) {
          this.toastFlag = 0;
        }
      }, this.timeOutDelay);
  }

  public btnClick(): void {
    this.toastShow()
  }

  public render() {
    return (
      <div>
        <ButtonComponent cssClass="e-primary" onClick={this.btnClick = this.btnClick.bind(this)}> Show Toast </ButtonComponent>
        <ToastComponent ref={toast => this.toastInstance = toast!} position={this.position} created={this.toastCreated = this.toastCreated.bind(this)} />
      </div>
    );
  }
};
export default App;