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Prevent duplicate Toast display

You can prevent identical same toast displaying in a screen by event function. You can terminate the toast displaying process by setting cancel event property in beforeOpen Event.

Here below sample demonstrates preventing duplicate title Toast element displaying, 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:'Center' };
    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.' },];
    public prevDuplicates: boolean = false;
    public toastFlag: number = 0;

    onBeforeOpen(e) {
      e.cancel = this.preventDuplicate(e);
    }

    preventDuplicate(e) {
      let toastEle: HTMLElement = e.element;
      let toasts: NodeList = e.toastObj.element.children;
       for (let i: number = 0; i < toasts.length; i++) {
        if ((toasts[i] as HTMLElement).querySelector('.e-toast-title').isEqualNode(toastEle.querySelector('.e-toast-title'))) {
            return true;
        }
    }
    return 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 */