Waiting patiently for the arrival of information, the dynamic duo of Angular and Firebase stand poised and

Here is the given code snippet:

      signIn(email, password) {
        let result = true;
        firebase.auth().signInWithEmailAndPassword(email, password).catch(error => result = false);
        waits(100);
        return result;
      }

I have a service that includes the above method, but the return statement executes before retrieving data from firebase. How can I resolve this issue?

SOLUTION

login.component.ts

  login() {
    this.loggedService.signIn(this.email, this.password).then(value => {
      console.log(value);
      if (value.user !== undefined) {
        this.loggedService.logged = true;
        this.router.navigateByUrl('account');
        console.log(1);
      }
    }).catch(error => {
      console.log(error);
    });

  }

logged.service.ts

  signIn(email, password) {
    return firebase.auth().signInWithEmailAndPassword(email, password);
  }

Answer №1

Here is a function that returns a promise:

  login(email, password) {
      return firebase.auth().signInWithEmailAndPassword(email, password);
  }

When calling this function, use the following syntax:

userService.login.then({
  //execute your code
}).catch({
  // incorrect password or email
});

Answer №2

When working with firebase auth and dealing with promises, you have the option to use await in order to pause and wait for the request to finish before proceeding:

async authenticateUser(email, password) {
        let success = true;
        await firebase.auth().signInWithEmailAndPassword(email, password).catch(error => success = false);
        return success;
}

Answer №3

let authenticated = false;

logIn(email, password) {

            firebase.auth().logInWithEmailAndPassword(email, password)
                                    .subcribe( res => {if(res) authenticated = true})
                                    .catch(error => authenticated = false);
          }

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