CODEWITHSUNDEEP
javascriptfirebasepromisefirebase-realtime-database
Joe Caraccio
Joe Caraccio

Reputation: 2035

Firebase basic promise returning

This is a pretty basic question, so I apologize in advance. But I have been struggling with this all night. I have a simple firebase database query... which I know works.. I use child_added so itll return a few times for each different node off of the spot I am querying.

I am then trying to compliment a callback after it is completely done calling. Right now it will return about 10 different values, so my goal is to then use a promise or some sort of callback to run code after the database reference is finished. 

 var getIsStarred = getFirebase().database().ref('feed/value').on('child_added').then(function(snapshot) {
    console.log("JX10: ok")
  });

Promise.(getIsStarred).then(function(results) {
    console.log("JX10: end promise thing okay sick")
});

Thanks in advance for help!

Upvotes: 1

Views: 1446

Answers (2)

Frank van Puffelen
Frank van Puffelen

Reputation: 600131

It sounds like you're trying to run an action after all children have been loaded. You'd do that with a once('value' handler:

var getIsStarred = getFirebase().database().ref('feed/value').once('value').then(function(snapshot) {
    console.log("the initial items have been loaded")
 });

Upvotes: 2

Matt Way
Matt Way

Reputation: 33209

Firebase's on() function docs are here: https://firebase.google.com/docs/reference/js/firebase.database.Reference#on

As you can see, it wants a callback, and also returns the callback so that it can be used as a parameter to an off() call if desired. It doesn't look like a promise is returned anywhere.

Upvotes: 2

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