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Restrict the maximum toast to show

You can restrict the maximum toast count by event callback function. You can terminate the toast displaying process by setting boolean as true to cancel, the argument which is obtained from beforeOpen Event.

You can restrict by your own count with custom code blocks. The below sample demonstrates that, how to restrict toast displaying up to 3.

Source
Preview
index.tsx
index.html
App.css.jsx
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import App  from './App';

ReactDOM.render(<App />, document.getElementById('element'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 React Accordion Sample</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #multiToast>div>button {
            margin-top: 20px;
        }

        #customChoose {
            display: none;
        }

        #toast_full_Position table {
            width: 100%;
        }

        #toast_full_width,
        #toast_full_Position {
            padding-top: 20px;
            margin: 20px;
        }

        #toast_full_width table td>div,
        #toast_full_Position table td>div {
            padding: 25px 0 0 0;
        }

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

        #elementTarget .e-toast-message {
            width: 100%;
        }

        .progress {
            height: 20px;
            position: relative;
            margin: 20px 0 20px 0;
            background: #555;
            -moz-border-radius: 25px;
            -webkit-border-radius: 25px;
            border-radius: 25px;
            box-shadow: inset 0 -1px 1px rgba(255, 255, 255, 0.3);
        }

        .progress span {
            background-color: #f0a3a3;
            background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #f0a3a3), color-stop(1, #f42323));
            display: block;
            height: 100%;
            border-radius: 10px;
            width: 50%;
            position: relative;
            overflow: hidden;
        }

        .progress span::after {
            background-image: -webkit-gradient(linear, 0 0, 100% 100%,
            color-stop(.25, rgba(255, 255, 255, .2)),
            color-stop(.25, transparent), color-stop(.5, transparent),
            color-stop(.5, rgba(255, 255, 255, .2)),
            color-stop(.75, rgba(255, 255, 255, .2)),
            color-stop(.75, transparent), to(transparent));
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            bottom: 0;
            right: 0;
            background-size: 50px 50px;
            -webkit-animation: moveAnimate 2s linear infinite;
            overflow: hidden;
        }

        @-webkit-keyframes moveAnimate {
            0% {
                background-position: 0 0;
            }
            100% {
                background-position: 50px 50px;
            }
        }

        #elementToastTime {
            text-align: center;
        }

        #elementToastTime img {
            width: 100px;
            height: 100px;
            border-radius: 50%;
        }

        #elementToastTime .e-toast-message {
            width: inherit;
        }


        body> #template_toast .e-toast {
            width: 400px !important;
        }


        #template_toast .horizontal-align {
            margin: 10px 0;
        }

        #template_toast .horizontal-align .toast-content .toast-message {
            opacity: 0.4;
        }

        #template_toast .horizontal-align .toast-content {
            display: inline-flex;
            flex: 1;
            flex-direction: column;
            margin-left: 10px;
        }
    </style>
</head>

<body>
    <div id='root'>
        <div id='loader'>Loading....</div>
    </div>
    <div id='templateToast' style="display: none;color:red"> System affected by virus !!! </div>
</body>
<script id="template_toast_ele" type="text/x-template">
    <div id='template_toast' style="display: none">
        <div class="horizontal-align">
            <div class='toast-content'>
                <div class='toast-title'>
                    Weekend Alarm
                </div>
                <div class='toast-message'> With traffic, its likely to take 45 minutes to get to jenny's 24th Birthday Bash at Hillside Bar, 454 E.
                    Olive Way by 10:00PM </div>
            </div>
        </div>
        <img src="http://npmci.syncfusion.com/development/demos/src/toast/resource/map.jpg" width="100%" height="70%">
    </div>
</script>

</html>
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.' },
            { title: 'Success !', content: 'Your message has been sent successfully.' },
            { title: 'Error !', content: 'A problem has been occurred while submitting your data.' },
        ];
        this.toastFlag = 0;
        this.maxCount = 3;
        this.timeOutDelay = 600;
        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();
    }
    onBeforeOpen(e) {
        if (this.maxCount === this.toastInstance.element.childElementCount) {
            e.cancel = true;
        }
        else {
            e.cancel = false;
        }
    }
    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} beforeOpen={this.onBeforeOpen = this.onBeforeOpen.bind(this)} created={this.toastCreated = this.toastCreated.bind(this)}/>
      </div>);
    }
}
;
export default App;