python ruby-programming-language Smalltalk Vue.js Knockoutjs TypeScript JavaScript, OOPs JavaScript Angular 8,7,6,5,4 and 2 Interview Questions and Answers Angular 8,7,6,5,4 and 2 Interview Questions and Answers Angular 4 Angular 2 AngularJs 1.x NodeJs Perl Programming R Programming RequireJs Rust Programming Backbonejs closure programming language go-programming-language kotlin-programming-language
Firebase

What Are the Types of Firebase Events?

There are different types of event available in the Firebase and some of the below even looks like -
1.     child_added event
2.     child_changed event
3.     child_removed  event

Example for child added Event–
var usersRef = firebase.database().ref("users/");

usersRef.orderByChild("name").startAt("Anil").on("child_added", function(result) {
        console.log("Start at filter - " + result.val().name);
});


Example for child changed Event –
var usersRef = firebase.database().ref("users/");

usersRef.on("child_changed", function(result) {
    var user = result.val();
    console.log("The updated user name is - " + result.name);
});

Example for child removed Event –
var usersRef = firebase.database().ref("users/");

users.on("child_removed", function(result) {
    var user = result.val();
    console.log(user.name + " has been deleted.");
});

Stayed Informed - Firebase Tutorial for Android and IOS

I hope you are enjoying with this post! Please share with you friends. Thank you so much!
ANIL SINGH

Hi there! Welcome to my blog. My name is Anil Singh. I'm a author of this blog. For more detail about me, kindly refer to this link..
My Blogs - http://code-sample.com and http://code-sample.xyz
My Books - Interview Questions and Answers Books- Get Your Book in 15+ Digital Stores Worldwide..

You Might Also Like
www.code-sample.com/. Powered by Blogger.
ASK Questions