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| function go() { | |
| var userId = prompt('Username?', 'Guest'); | |
| checkIfUserExists(userId); | |
| } | |
| var USERS_LOCATION = 'https://SampleChat.firebaseIO-demo.com/users'; | |
| function userExistsCallback(userId, exists) { | |
| if (exists) { | |
| alert('user ' + userId + ' exists!'); | |
| } else { | |
| alert('user ' + userId + ' does not exist!'); | |
| } | |
| } | |
| // Tests to see if /users/<userId> has any data. | |
| function checkIfUserExists(userId) { | |
| var usersRef = new Firebase(USERS_LOCATION); | |
| usersRef.child(userId).once('value', function(snapshot) { | |
| var exists = (snapshot.val() !== null); | |
| userExistsCallback(userId, exists); | |
| }); | |
| } |
How to retrieve the user email using the user id (client id)?
sudikrt, create a table with names and emails and add data to it after user has registered. then you will be able to search for records by email or id.
The crux: var exists = (snapshot.val() !== null);
if you want to listen on a node. You can change the implementation to the snippet below.
const checkIfUserExists = (userId) => {
const usersRef = new Firebase(USERS_LOCATION);
usersRef.child(userId).on('value', (snap) => {
const exists = (snap.val() !== null);
userExistsCallback(userId, exists);
});
}
didn't know about the once() method. thanks 👍
Can you do this in swift?
Nice!
+2
I am making chat application using java, "https://github.com/Abdul007Malik/Conversa.git", I am confused and cannot progress further help me if you can, my questions:
- if I know the auth.getUID of others can i modify there data or firebase have different mechanism to check authentication.
- how can I send the invitation(inviting to join the group) to friends if i know there phone numbers but dont know there particular userid.
Did you find any solution for this. I am facing same issue where I know email id but not user id
Can you give us python examples??
Can you give us python examples??
For python example
https://stackoverflow.com/questions/59253867/how-to-check-if-a-child-in-firebase-database-exists-using-django/60844998#60844998
thank's man, very helpful =)
Please any body can tell me that i have request record in firebase . i want to get spesific user which userId is 91 how i can access this user by query on firebase
{
"request" :
{
"123" :
{
"userId" : "90",
"name" : "mary"
},
"124" :
{
"userId" : "91",
"name" : "johan"
},
"124" :
{
"userId" : "92",
"name" : "maikal"
}
}
}