Fetching Data - simple

[Marcio Valenzuela]

I've taken the login sample from the firebase site:

https://github.com/firebase/quickstart-js/blob/master/auth/email.html

and I've used it to log into my app.  Now I want to move on to fetching data from my app.  So I added this function:

function getMyData() {

var msgName = document.getElementById('name').value;

var newClientKey = database.ref().child('messages').push().key;

database.ref('messages/' + newClientKey + '/name').get(msgName);

window.alert(username);

//document.write(starCountRef);

}

which I plan to call right at the end of the sendPasswordResetEmail function.

I made up that .get() actually because I saw a set() method.  I was wondering if it exists.

The other way I've seen to retrieve data is by using either:

// Try to read a message

// var messageRef = firebase.database().ref('messages/');

// messageRef.on('value', function(snapshot) {

//   updateStarCount(postElement, snapshot.val());

// });

or:

//Try to read users data-once

var userId = firebase.auth().currentUser.uid;

return firebase.database().ref('/users/' + userId).once('value').then(function(snapshot) {

  var name = snapshot.val().name;

  // ...

});

My data looks like this:

[ry...@bloomcu.com]

Hey Marcio,

I recently got over the hump of learning how to read my Firebase data, the two Realtime Database videos on Firebase's Youtube channel made things extremely clear. I really hope this helps you. I'm happy to post my code and help you more. Here are the videos:

Part 1: https://youtu.be/noB98K6A0TY?list=PLl-K7zZEsYLmnJ_FpMOZgyg6XcIGBu2OX

Part 2: https://youtu.be/dBscwaqNPuk?list=PLl-K7zZEsYLmnJ_FpMOZgyg6XcIGBu2OX

[Marcio Valenzuela]

I've got the first level nodes working, grocery-items and online.

I cannot get the autogenerated id sublevel nodes to work like messages----autokey----name,text...

Ive got this so far.  I know I have to somehow get the key by pushing it and then use it to rebuild the ref:

function getMyData() {

   //1 code for getting messages because of auto-generated id

var messageRef = firebase.database().ref('messages/');

messageRef.forEach(function(secondsnapshot) {

var newClientKey = database.ref().child('messages').push().key;

var textname = database.ref('messages/' + newClientKey + '/name').getValue(msgName);

  window.alert(textname);

  });
}

On Wednesday, September 14, 2016 at 7:13:56 PM UTC-6, Marcio Valenzuela wrote:

[Marcio Valenzuela]

Ryan

Thanks for the help!  I went through the videos and I am able to get some values great!  Im using this code:

        const preObject = document.getElementById('object');

const dbRefObject = firebase.database().ref().child('timeoff');

dbRefObject.on('value', function(snapshot) {

console.log(snapshot.val());

});

For this data structure I can get values for the first three nodes that have children, but I cant get the values for timeoff or timeon:

[Marcio Valenzuela]

Thanks Ryan.  Ill look these over.  For the time being, I managed to get the data I needed but by looping through with for loop if child had a key.  Id like to eventually learn how to actually get the key value.

Then I went ahead and complicated things a bit more by trying to access a parent value (timeoff & timeon):

Thanks for the videos.  Ill check them out.

[ry...@bloomcu.com]

It's very easy to access children nodes by using snapshot, take a look below!

Here I want to access all hobbies:

Here is how I get that data from Firebase by taking a snapshot of the "hobbies" snapshot:

var hobbieList = document.getElementById('hobbieList');
objectRef = firebaseRoot.child('object');

objectRef.child('hobbies').on('child_added', function (snap) {

  var li = document.createElement('li');

  li.innerText = snap.val();

  li.id = snap.key;

  hobbieList.appendChild(li);

});

What I get returned is a list of hobbies, which I place in an unordered list.

I hope this helps you! Let me know, please :)

On Thursday, September 15, 2016 at 9:31:01 AM UTC-6, Marcio Valenzuela wrote:

Thanks Ryan.  Ill look these over.  For the time being, I managed to get the data I needed but by looping through with for loop if child had a key.  Id like to eventually learn how to actually get the key value.

Then I went ahead and complicated things a bit more by trying to access a parent value (timeoff & timeon): 

Enter code here...

[Marcio Valenzuela]

I thought this code should work:

console.log("testing");

return firebase.database().ref('timeoff').once('value', function(snapshot){   

      console.log("hello");

      window.alert(snapshot.val());

})

but it doesnt.

Any ideas?

On Thursday, September 15, 2016 at 9:31:01 AM UTC-6, Marcio Valenzuela wrote:

[Marcio Valenzuela]

Yes I see that. But those are all children of the object object.

How would you access the title object's value of "The Title"?

[Marcio Valenzuela]

Turned out to be a permissions issue.  My code was fine.

[Ryan Harmon]

D'oohhh why didn't I think about that! Yeah, until you setup anonymous auth, or email auth you have to set your database read/write permissions to true.

Sorry I didn't think of that, glad you figured it out!

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Ryan Harmon

Co-Founder | bloomcu.com

(385) 204-4451