Prevent duplicate Toast messages in Ionic

Question

I have implemented toast using ToastController in my ionic2 project . Currently i am facing an issue with the duplicate toast

Answer 1

You can use a property on that page to know if a toast is being shown or not before showing a new one.

Ionic 2/3

import { ToastController, Toast } from 'ionic-angular';

// ...

private isToastVisible: boolean;

constructor(private toastCtrl: ToastController) { }

presentToast() {
  if(this.isToastVisible) {
    return;
  }

  this.isToastVisible = true;

  const toast: Toast = this.toastCtrl.create({
    message: 'User was added successfully',
    duration: 3000,
    position: 'top'
  });

  toast.onDidDismiss(() => {
    this.isToastVisible = false;
  });

  toast.present();
}

Ionic 4/5

import { ToastController } from '@ionic/angular';

// ...

private isToastVisible: boolean;

constructor(private toastCtrl: ToastController) { }

presentToast() {
  if(this.isToastVisible) {
    return;
  }

  this.isToastVisible = true;

  this.toastCtrl.create({
    message: 'User was added successfully',
    duration: 3000,
    position: 'top'
  }).then((toast: HTMLIonToastElement) => {

    toast.onDidDismiss().then(() => {
      this.isToastVisible = false;
    });

    toast.present();
  })      
}

Answer 2

I set preventDuplicates to 1 in my toastr.js file, please see below;

function p() {
    return {
        tapToDismiss: !0,
        toastClass: "toast",
        containerId: "toast-container",
        debug: !1,
        showMethod: "fadeIn",
        showDuration: 300,
        showEasing: "swing",
        onShown: void 0,
        hideMethod: "fadeOut",
        hideDuration: 1e3,
        hideEasing: "swing",
        onHidden: void 0,
        closeMethod: !1,
        closeDuration: !1,
        closeEasing: !1,
        closeOnHover: !0,
        extendedTimeOut: 1e3,
        iconClasses: {
            error: "toast-error",
            info: "toast-info",
            success: "toast-success",
            warning: "toast-warning"
        },
        iconClass: "toast-info",
        positionClass: "toast-top-right",
        timeOut: 2e3,
        titleClass: "toast-title",
        messageClass: "toast-message",
        escapeHtml: !1,
        target: "body",
        // closeButton: true,
        closeHtml: '<button type="button">&times;</button>',
        closeClass: "toast-close-button",
        newestOnTop: !0,
        preventDuplicates: 1,
        progressBar: 1,
        progressClass: "toast-progress",
        rtl: !1
    }
}