Firebase detection if user exists
How to check if user exists in Firebase auth on Signup
Button via native react?
This is my login page code:
export default class Login extends Component {
constructor(props) {
super(props)
this.state = {
email: '',
password: '',
response: ''
}
this.signUp = this.signUp.bind(this)
this.login = this.login.bind(this)
}
async signUp() {
try {
await firebase.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
this.setState({
response: 'Account Created!'
})
setTimeout(() => {
this.props.navigator.push({
id: 'App'
})
}, 500)
} catch (error) {
this.setState({
response: error.toString()
})
}
}
async login() {
try {
await firebase.auth().signInWithEmailAndPassword(this.state.email, this.state.password)
this.setState({
response: 'user login in'
})
setTimeout(() => {
this.props.navigator.push({
id: 'App'
})
})
} catch (error) {
this.setState({
response: error.toString()
})
}
}
render() {
return (
<View style={styles.container}>
<View style={styles.containerInputes}>
<TextInput
placeholderTextColor="gray"
placeholder="Email"
style={styles.inputText}
onChangeText={(email) => this.setState({ email })}
/>
<TextInput
placeholderTextColor="gray"
placeholder="Password"
style={styles.inputText}
password={true}
secureTextEntry={true}
onChangeText={(password) => this.setState({ password })}
/>
</View>
<TouchableHighlight
onPress={this.login}
style={[styles.loginButton, styles.button]}
>
<Text
style={styles.textButton}
>Login</Text>
</TouchableHighlight>
<TouchableHighlight
onPress={this.signUp}
style={[styles.loginButton, styles.button]}
>
<Text
style={styles.textButton}
>Signup</Text>
</TouchableHighlight>
</View>
)
}
}
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You need to use the fetchProvidersForEmail API. It receives an email and returns a promise that resolves with a list of vendors associated with that email if already registered: https://firebase.google.com/docs/reference/js/firebase.auth.Auth#fetchProvidersForEmail
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It's very simple. Add then () and catch () method to your firebase method in the signUp function.
firebase.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
.then(()=>{
console.log('Signup successful.');
this.setState({
response: 'Account Created!'
})
})
.catch((error)=> {
console.log(error.code);
console.log(error.message);
});
Information about different error codes:
-
authorization / email-already in use
Thrown if an account already exists with the specified email address.
-
Auth / invalid-mail
Abandoned if the email address is invalid.
-
auto / operation-not-allowed
Abandoned if email and password accounts are not enabled. Enable email / password accounts in Firebase Console under Auth tab.
-
login / weak password
Thrown if the password is not strong enough.
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