ReactJS:setState could not work in Syncfusion React Toast - reactjs

Question

I using Syncfusion React Toast with singnalr for showing popup notification to user. but after fetch data from server with signalr and set message state with fetched value, toast content shows initial value which it`s assigned in constructor function.
import React, { Component } from 'react';
import { ToastComponent } from '#syncfusion/ej2-react-notifications';
import * as signalR from '#aspnet/signalr';
class Notification extends ToastComponent {
constructor() {
super(...arguments);
this.position = { X: 'Right', Y: 'Top' }
this.state = { message: '555'}
}
toastCreated() {
this.toastInstance.show({ timeOut: 0 })
}
componentDidMount() {
const notifConn = new signalR.HubConnectionBuilder().withUrl("/notif").build();
notifConn.on("ReceiveMessage",(msg) => {
this.setState({ message: msg });
});
notifConn.start().then(function () {
notifConn.invoke("SendNotification");
}).catch(function (er) {
console.log(er.toString());
});
}
render() {
return (
<div>
<ToastComponent
id='toast_target'
ref={toast => this.toastInstance = toast}
title={this.state.message}//it shows 555!!!
content={this.state.message} //it shows 555!!!
position={this.position}
showCloseButton
created={this.toastCreated = this.toastCreated.bind(this)}
/>
</div>
);
}
}
export default Notification;

Answer 1

Greetings from Syncfusion support.
By default, we couldn’t modify the content dynamically for existing displaying toasts. Dynamically changed content will be shown on notify the next toasts.
So, we suggest you to hide the previous toast and show the next toast after setState.
Please find the below code for your reference.
Chat.js
constructor(props) {
super(props);
this.state = {
message: '',
};
componentDidMount = () => {
const nick = window.prompt('Your name:', 'John');
const hubConnection = new HubConnection('http://localhost:5000/chat');
this.setState({ hubConnection, nick }, () => {
…………..
this.state.hubConnection.on('sendToAll', (nick, receivedMessage) => {
this.setState({ message: receivedMessage }); // Change the toast content using state
this.toastObj.hide(); // You can hide the toast
this.toastObj.show(); // You can show the toast
});
});
};
create = () => {
this.toastObj.show({ timeOut: 0 });
}
<ToastComponent ref={ (toast) => { this.toastObj = toast; } } content = { this.state.message } id = 'toast_default' created = { this.create.bind(this) } > </ToastComponent>
We have created sample for an ASP.NET core signalr with the react toast component.
Sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/AspNetCoreSignalRToastReact1983063835
Please find the below steps to run the above sample.
Navigate inside of AspNetCoreSignalR_React.Client folder and enter
‘npm install’.
Start the client app by entering ‘npm start’.
Run the AspNetCoreSignalR_React.Server project.
If the above solution doesn’t meet your requirement, kindly send the below details.
Have any reason on using static toasts with dynamic content update?
Regards,
Narayanasamy P.