firebase-realtime-database

How to implement an image popup in jquery for firebase

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问题 I am in a bit trouble as I don't know how to implement the image popup in jquery for firebase. I have searched it on the internet but did not find the way how to implement it for the dynamic websites. I am having the following jquery code, can anyone help? I haven't found anything on stackoverflow also regarding this. this is my html code <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale

Firebase sharing data with other users

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问题 I want to create item lists using Firebase that can be created by a user and then he can specify other users to share the list with (so they can also modify its contents). I plan to do this by using the following structure: So the user section specifies the lists that a user has. Then the node 'lists', all lists created have a unique id and for each list its members are specified: In this example, Rick is the admin of the list and Tom just a member. Now I want the rules to, for example, only

I have one this.state and i need pass in my componentDidMount with setState, how use bind(this) in setState?

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问题 I have that pass Bind in setState, how to do? enter image description here TypeError: Cannot read property 'setState' of undefined I am using the RealTime Firebase and ReactJs constructor() { super() this.app = firebase.initializeApp(firebase_config); this.database = this.app.database().ref().child('users'); this.state = { users: [] } } componentDidMount() { this.database.once("value", function(snapshot) { snapshot.forEach(function(data) { this.setState({users: data.val()}) }) }); } render()

Firebase or Swift not detecting umlauts

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问题 I found some weirdest thing in Firebase Database/Storage. The thing is that I don't know if Firebase or Swift is not detecting umlauts e.g(ä, ö, ü). I did some easy things with Firebase like upload images to Firebase Storage and then download them into tableview . Some of my .png files had umlauts in the title for example( Röda.png ). So the problem occurs now if I download them. The only time my download url is nil is if the file name contains the umlauts I was talking about. So I tried some

Firebase Database Android - Snapshot retrieval order from multiple ValueEventListeners

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问题 I'm building an Android app that heavily uses Firebase's Database. In the Database, I have a node called RootNode which contains 100 children nodes. Each child of RootNode has its own children (from 30 to 60 each), each with its own key-value properties (so, we're talking a substantial amount of data per child node). Client-side, I have the keys of all the children of RootNode stored in List<String> list . By looping through this list, I'm adding a ValueEventListener to each child of RootNode

android firebase get string from datasnapshot to the outside

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问题 suppose i am getting data from firebase as DatabaseReference mdb=FirebaseDatabase.getInstance().getReference("users/"+id); mdb.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { String name=dataSnapshot.child("name").getValue(); } @Override public void onCancelled(DatabaseError databaseError) { } }); //point b its working perfectly.... if i try to print that string name using @Override public void onDataChange(DataSnapshot

FireStore Swift 4 : How to get total count of all the documents inside a collection, and get details of each document?

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问题 I need to get all the users count from superuser and list those in a table view with there details. Is there a code to directly get the count of documents inside a collection, other than using functions inside firebase console. Or a Simple Query to traverse through the documents! 回答1: this will collect all the document for a collection and print them db.collection("superUsers").getDocuments() { (querySnapshot, err) in if let err = err { print("Error getting documents: \(err)"); } else { var

FireStore Swift 4 : How to get total count of all the documents inside a collection, and get details of each document?

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Using pure Observable vs array (from subscribe)

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问题 I was wondering about best practices regard using pure observable vs subscribe to an observable and use an array. option 1 - "pure observable" this.schools = this.angularFire.database.list('schools') and then in the HTML use async pipe (and rxjs operators for handling the data) option 2 - "subscribe to array" this.angularFire.database.list('schools').subscribe (response => this.schools=response) and then treat it as a normal array. 回答1: As olsn pointed out in the comments, it is always more

Firestore querying with roles?

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问题 In the documentation it's stated that you can query by comparing string to another string value e.g: citiesRef.where('name', '>=', 'San Francisco'); citiesRef.where('state', '>=', 'CA').where('state', '<=', 'IN'); Then there is this roles part in the documentation that shows how to apply roles in Firestore documents. However it's not shown how to query this.. But as shown in above example, this should work like following: citiesRef.where(`roles.${user.uid}`, '>', ''); so this query above,