Watching in real time for a dynamic list with Firebase using Javascript

Currently, a dynamic list of users is being populated with data from the firebase database. However, when any value is updated for a user, it does not immediately reflect on the client side because there is no listener set up for this.

//Loop through All Users
var anotherUserId = snapshot.key;
var ref = firebase.database().ref("users/"+anotherUserID);
ref.on('value', function(snapshot) {
   var obj = snapshot.val();
   li += '    <div class="contacts-container '+obj.status+'">';
   li += '        <h3>'+obj.fname+' '+obj.lname+'</h3>';
 });
//End of Loop 

If the status is changed for a user, the update will not be visible on the client side until the page is refreshed.

My goal is to achieve something similar to what is shown in thishttps://i.sstatic.net/mHl3w.png

Hence, whenever a user's status in the database changes, the corresponding class in the DIV should also change to display an online/offline signal (Grey or Green).

In essence, real-time updates are currently not functioning as intended, but they do work upon refreshing the page.

Answer №1

If you want to monitor changes in the user database, utilize the child_changed event. Assign an id to the div so that you can easily identify which one has changed and update the class accordingly. Here's a sample code snippet that demonstrates this concept:

const reference = firebase.database().ref("users");

reference.on('child_changed', function(snapshot){
 const changedUserData = snapshot.val();
 document.getElementById(changedUserData.id).classList.toggle('active');
}

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