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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 cancel event property in beforeOpen Event.

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

Source
Preview
app.component.ts
app.module.ts
main.ts
index.html
index.css
import { Component, ViewChild } from '@angular/core';

@Component({
    selector: 'app-root',
    template: `
        <div id="toast_target"></div>
        <button ejs-button [isPrimary]="true" (click)="btnClick($event)">Show Toast</button>
        <ejs-toast #element (created)="onCreate($event)" (beforeOpen)="onBeforeOpen($event)"  [position] = 'position' > </ejs-toast>
        `
})

export class AppComponent {
    @ViewChild('element') element;
    public position = { X: 'Right', Y: 'Bottom' };
    public 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.' },
    { title: 'Information !', content: 'Please read the comments carefully.' }];
    public maxCount: number = 3;
    public toastFlag:number = 0;

    onBeforeOpen(e) {
      if (this.maxCount === this.element.element.childElementCount) {
   e.cancel =true;
  } else {
    e.cancel = false;
  }
    }

    onCreate() {
      this.element.show(this.toasts[this.toastFlag]);
      ++this.toastFlag;
    }
    btnClick() {
      this.toastShow();
    }
    toastShow() {
          setTimeout(
        () => {
            this.element.show(this.toasts[this.toastFlag]);
            ++this.toastFlag;
              if (this.toastFlag === (this.toasts.length)) {
                this.toastFlag = 0;
               }
        }, 0);
    }
    ngAfterViewInit() {
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ToastModule } from '@syncfusion/ej2-angular-notifications';
import { ButtonModule, CheckBoxModule , RadioButtonModule } from '@syncfusion/ej2-angular-buttons';
import { DropDownListModule } from '@syncfusion/ej2-angular-dropdowns';
import { DatePickerModule } from '@syncfusion/ej2-angular-calendars';
import { AppComponent } from './app.component';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ToastModule, ButtonModule, CheckBoxModule , RadioButtonModule, DropDownListModule, DatePickerModule
    ],
    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);
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion Angular Toast Sample</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Toolbar Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/material.css" rel="stylesheet" />
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link href="index.css" rel="stylesheet" />
    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/2.4.1/core.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/zone.js/0.6.25/zone.min.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <app-root>
        <div id='loader'>LOADING....</div>
    </app-root>
    <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>
</body>
</html>
/* csslint ignore:start */
#container {
    margin: 25px;
}

#elementToastTime .e-toast {
    width: 500px;
    height: 147px;
}

#elementToastTime {
    text-align: center;
}

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

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

#sample_container {
    margin: 10px;
}

body>#element .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;
}

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

.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;
    }
}
/* csslint ignore:end */