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 - " +;

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

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

Stayed Informed - Firebase Tutorial for Android and IOS

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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..

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