Why We use Event module in Nodejs ?
Important for example - When user registered we want to many work for user like as store in database, send welcome mail and many work it will help you to do all the things in very good manner
How to use it
const emmiter = require('event'); it will return class then
const myemmiter = new emmiter(); convert into object
Create Event listener
myemmiter.on('greeting',(data)=>{
console.log("welcome to OffSection India ",data);
})
greeting= Event name
data = recving data from emit
Emit or Call event listener
myemmiter.emit('greeting','AshutoshKumar');
in this emit greeting is event name and Ashutoshkumar is data
One Real World Example
When we require a student to add database and send mail and welcome massage we use this for all .
const emmiter = require('events');
//Creating Class
class registered extends emmiter {
registerd(username){
console.log(`You are successfully Registered `)
//calling event
this.emit('registered',username);
}
}
//making Object
const Registered = new registered();
//listen event for add to data base
Registered.on('registered',(data)=>{
console.log(`Hey Mr/Mrs ${data}\nYou are successfully
Added to our DataBase`);
})
//listen event for welcome massage
Registered.on('registered',(data)=>{
console.log(`Hey Mr/Mrs ${data}\nWelcome Come To Our Company`);
})
//listen event send password to email
Registered.on('registered',(data)=>{
console.log(`Hey Mr/Mrs ${data}\nplease Check Your mail For
Password and Username`);
})
//calling object function
Registered.registerd('Ashutosh Kumar');
