react native - undefined is not an object(evaluating 'password.toString')

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So, basically, I have two JavaScript files, in one of them there's a function that authenticates to an API and the other one is the login screen running in the emulator. When I try to authenticate, I get the error:

undefined is not an object (evaluating 'password.toString')

This is the login screen file:

import React, {Component} from 'react';

import {View, Text, TextInput, TouchableOpacity} from 'react-native';

import styles from './login-styles';

import {auth} from '../../fetches/auth';



class LoginBox extends Component {

    constructor(props) {

        super(props)



        this.state = {

            username: '',

            password: ''

        }

    }



    render = () => {

        return(

            <View style={styles.box}>

                <View style={styles.header}>

                    <Text style={{fontSize: 28}}>Bem-vindo ao PostBag v 0.0.2</Text>

                </View>



                <View styles={styles.app}>

                    <TextInput style={styles.square} 

                        keyboardType="numeric" 

                        placeholder='Insira sua matrúcla' 

                        onChangeText={(text) => this.setState({username: text})}

                        value={this.state.username}    

                    />

                    <TextInput style={styles.square} 

                        secureTextEntry

                        placeholder='Insira sua senha' 

                        onChangeText={(text) => this.setState({password: text})}

                        value={this.state.password}

                    />

                    

                    <TouchableOpacity

                        style={styles.button}

                        onPress={() => auth((this.state.username, this.state.password))}

                    >

                        <Text style={styles.buttonTxt}>POST</Text>

                    </TouchableOpacity>

                </View>

            </View>

        )

    }

}



export default LoginBox;

This is the authentication function:

import {Alert} from 'react-native';



export function auth(username, password) {

    fetch('https://suap.ifrn.edu.br:443/api/v2/autenticacao/token/',

    {

        method: 'POST',

        headers: {

            'Accept': 'application/json',

            'Content-Type': 'application/json',

            'x-csrftoken': 'NDML6yy6HgTUIoypfWMZHMKZ32lgJf5PsNolVnLgewanw5YM4rqwkuvgkyAhEYEA'

        },

        body: JSON.stringify({

          username: username.toString(),

          password: password.toString()

        })

    }).then(function(response) {

        var json = response.json()

        json.then((data) => {

            token = data.token



            if (typeof token === 'undefined') {

                Alert.alert('Não foi possível fazer login')

            }

            else {

                Alert.alert('Login feito com sucesso')

            }

        })

    })

}

I would really appreciate if anyone could help me with that. Everything that I tried did not work.

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

asked Nov 24 '18 at 17:34

B. Vilela

1

What's going on here? => auth((this.state.username, this.state.password)). You're using double parentheses for some reason. Isn't that giving you an error? Try removing one set and see if that makes a difference.

– Andy
Nov 24 '18 at 17:39

What happens when you throw a console.log('password:', password) right before your fetch call? Make sure you're actually passing the data to the function. The error indicates you might not be passing the data

– mccambridge
Nov 24 '18 at 18:13

add a comment |

undefined is not an object (evaluating 'password.toString')

This is the login screen file:

import React, {Component} from 'react';

import {View, Text, TextInput, TouchableOpacity} from 'react-native';

import styles from './login-styles';

import {auth} from '../../fetches/auth';



class LoginBox extends Component {

    constructor(props) {

        super(props)



        this.state = {

            username: '',

            password: ''

        }

    }



    render = () => {

        return(

            <View style={styles.box}>

                <View style={styles.header}>

                    <Text style={{fontSize: 28}}>Bem-vindo ao PostBag v 0.0.2</Text>

                </View>



                <View styles={styles.app}>

                    <TextInput style={styles.square} 

                        keyboardType="numeric" 

                        placeholder='Insira sua matrúcla' 

                        onChangeText={(text) => this.setState({username: text})}

                        value={this.state.username}    

                    />

                    <TextInput style={styles.square} 

                        secureTextEntry

                        placeholder='Insira sua senha' 

                        onChangeText={(text) => this.setState({password: text})}

                        value={this.state.password}

                    />

                    

                    <TouchableOpacity

                        style={styles.button}

                        onPress={() => auth((this.state.username, this.state.password))}

                    >

                        <Text style={styles.buttonTxt}>POST</Text>

                    </TouchableOpacity>

                </View>

            </View>

        )

    }

}



export default LoginBox;

This is the authentication function:

import {Alert} from 'react-native';



export function auth(username, password) {

    fetch('https://suap.ifrn.edu.br:443/api/v2/autenticacao/token/',

    {

        method: 'POST',

        headers: {

            'Accept': 'application/json',

            'Content-Type': 'application/json',

            'x-csrftoken': 'NDML6yy6HgTUIoypfWMZHMKZ32lgJf5PsNolVnLgewanw5YM4rqwkuvgkyAhEYEA'

        },

        body: JSON.stringify({

          username: username.toString(),

          password: password.toString()

        })

    }).then(function(response) {

        var json = response.json()

        json.then((data) => {

            token = data.token



            if (typeof token === 'undefined') {

                Alert.alert('Não foi possível fazer login')

            }

            else {

                Alert.alert('Login feito com sucesso')

            }

        })

    })

}

I would really appreciate if anyone could help me with that. Everything that I tried did not work.

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

asked Nov 24 '18 at 17:34

B. Vilela

1

What's going on here? => auth((this.state.username, this.state.password)). You're using double parentheses for some reason. Isn't that giving you an error? Try removing one set and see if that makes a difference.

– Andy
Nov 24 '18 at 17:39

What happens when you throw a console.log('password:', password) right before your fetch call? Make sure you're actually passing the data to the function. The error indicates you might not be passing the data

– mccambridge
Nov 24 '18 at 18:13

add a comment |

undefined is not an object (evaluating 'password.toString')

This is the login screen file:

import React, {Component} from 'react';

import {View, Text, TextInput, TouchableOpacity} from 'react-native';

import styles from './login-styles';

import {auth} from '../../fetches/auth';



class LoginBox extends Component {

    constructor(props) {

        super(props)



        this.state = {

            username: '',

            password: ''

        }

    }



    render = () => {

        return(

            <View style={styles.box}>

                <View style={styles.header}>

                    <Text style={{fontSize: 28}}>Bem-vindo ao PostBag v 0.0.2</Text>

                </View>



                <View styles={styles.app}>

                    <TextInput style={styles.square} 

                        keyboardType="numeric" 

                        placeholder='Insira sua matrúcla' 

                        onChangeText={(text) => this.setState({username: text})}

                        value={this.state.username}    

                    />

                    <TextInput style={styles.square} 

                        secureTextEntry

                        placeholder='Insira sua senha' 

                        onChangeText={(text) => this.setState({password: text})}

                        value={this.state.password}

                    />

                    

                    <TouchableOpacity

                        style={styles.button}

                        onPress={() => auth((this.state.username, this.state.password))}

                    >

                        <Text style={styles.buttonTxt}>POST</Text>

                    </TouchableOpacity>

                </View>

            </View>

        )

    }

}



export default LoginBox;

This is the authentication function:

import {Alert} from 'react-native';



export function auth(username, password) {

    fetch('https://suap.ifrn.edu.br:443/api/v2/autenticacao/token/',

    {

        method: 'POST',

        headers: {

            'Accept': 'application/json',

            'Content-Type': 'application/json',

            'x-csrftoken': 'NDML6yy6HgTUIoypfWMZHMKZ32lgJf5PsNolVnLgewanw5YM4rqwkuvgkyAhEYEA'

        },

        body: JSON.stringify({

          username: username.toString(),

          password: password.toString()

        })

    }).then(function(response) {

        var json = response.json()

        json.then((data) => {

            token = data.token



            if (typeof token === 'undefined') {

                Alert.alert('Não foi possível fazer login')

            }

            else {

                Alert.alert('Login feito com sucesso')

            }

        })

    })

}

I would really appreciate if anyone could help me with that. Everything that I tried did not work.

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

asked Nov 24 '18 at 17:34

B. Vilela

undefined is not an object (evaluating 'password.toString')

This is the login screen file:

import React, {Component} from 'react';

import {View, Text, TextInput, TouchableOpacity} from 'react-native';

import styles from './login-styles';

import {auth} from '../../fetches/auth';



class LoginBox extends Component {

    constructor(props) {

        super(props)



        this.state = {

            username: '',

            password: ''

        }

    }



    render = () => {

        return(

            <View style={styles.box}>

                <View style={styles.header}>

                    <Text style={{fontSize: 28}}>Bem-vindo ao PostBag v 0.0.2</Text>

                </View>



                <View styles={styles.app}>

                    <TextInput style={styles.square} 

                        keyboardType="numeric" 

                        placeholder='Insira sua matrúcla' 

                        onChangeText={(text) => this.setState({username: text})}

                        value={this.state.username}    

                    />

                    <TextInput style={styles.square} 

                        secureTextEntry

                        placeholder='Insira sua senha' 

                        onChangeText={(text) => this.setState({password: text})}

                        value={this.state.password}

                    />

                    

                    <TouchableOpacity

                        style={styles.button}

                        onPress={() => auth((this.state.username, this.state.password))}

                    >

                        <Text style={styles.buttonTxt}>POST</Text>

                    </TouchableOpacity>

                </View>

            </View>

        )

    }

}



export default LoginBox;

This is the authentication function:

import {Alert} from 'react-native';



export function auth(username, password) {

    fetch('https://suap.ifrn.edu.br:443/api/v2/autenticacao/token/',

    {

        method: 'POST',

        headers: {

            'Accept': 'application/json',

            'Content-Type': 'application/json',

            'x-csrftoken': 'NDML6yy6HgTUIoypfWMZHMKZ32lgJf5PsNolVnLgewanw5YM4rqwkuvgkyAhEYEA'

        },

        body: JSON.stringify({

          username: username.toString(),

          password: password.toString()

        })

    }).then(function(response) {

        var json = response.json()

        json.then((data) => {

            token = data.token



            if (typeof token === 'undefined') {

                Alert.alert('Não foi possível fazer login')

            }

            else {

                Alert.alert('Login feito com sucesso')

            }

        })

    })

}

I would really appreciate if anyone could help me with that. Everything that I tried did not work.

import React, {Component} from 'react';

import {View, Text, TextInput, TouchableOpacity} from 'react-native';

import styles from './login-styles';

import {auth} from '../../fetches/auth';



class LoginBox extends Component {

    constructor(props) {

        super(props)



        this.state = {

            username: '',

            password: ''

        }

    }



    render = () => {

        return(

            <View style={styles.box}>

                <View style={styles.header}>

                    <Text style={{fontSize: 28}}>Bem-vindo ao PostBag v 0.0.2</Text>

                </View>



                <View styles={styles.app}>

                    <TextInput style={styles.square} 

                        keyboardType="numeric" 

                        placeholder='Insira sua matrúcla' 

                        onChangeText={(text) => this.setState({username: text})}

                        value={this.state.username}    

                    />

                    <TextInput style={styles.square} 

                        secureTextEntry

                        placeholder='Insira sua senha' 

                        onChangeText={(text) => this.setState({password: text})}

                        value={this.state.password}

                    />

                    

                    <TouchableOpacity

                        style={styles.button}

                        onPress={() => auth((this.state.username, this.state.password))}

                    >

                        <Text style={styles.buttonTxt}>POST</Text>

                    </TouchableOpacity>

                </View>

            </View>

        )

    }

}



export default LoginBox;

import React, {Component} from 'react';

import {View, Text, TextInput, TouchableOpacity} from 'react-native';

import styles from './login-styles';

import {auth} from '../../fetches/auth';



class LoginBox extends Component {

    constructor(props) {

        super(props)



        this.state = {

            username: '',

            password: ''

        }

    }



    render = () => {

        return(

            <View style={styles.box}>

                <View style={styles.header}>

                    <Text style={{fontSize: 28}}>Bem-vindo ao PostBag v 0.0.2</Text>

                </View>



                <View styles={styles.app}>

                    <TextInput style={styles.square} 

                        keyboardType="numeric" 

                        placeholder='Insira sua matrúcla' 

                        onChangeText={(text) => this.setState({username: text})}

                        value={this.state.username}    

                    />

                    <TextInput style={styles.square} 

                        secureTextEntry

                        placeholder='Insira sua senha' 

                        onChangeText={(text) => this.setState({password: text})}

                        value={this.state.password}

                    />

                    

                    <TouchableOpacity

                        style={styles.button}

                        onPress={() => auth((this.state.username, this.state.password))}

                    >

                        <Text style={styles.buttonTxt}>POST</Text>

                    </TouchableOpacity>

                </View>

            </View>

        )

    }

}



export default LoginBox;

import {Alert} from 'react-native';



export function auth(username, password) {

    fetch('https://suap.ifrn.edu.br:443/api/v2/autenticacao/token/',

    {

        method: 'POST',

        headers: {

            'Accept': 'application/json',

            'Content-Type': 'application/json',

            'x-csrftoken': 'NDML6yy6HgTUIoypfWMZHMKZ32lgJf5PsNolVnLgewanw5YM4rqwkuvgkyAhEYEA'

        },

        body: JSON.stringify({

          username: username.toString(),

          password: password.toString()

        })

    }).then(function(response) {

        var json = response.json()

        json.then((data) => {

            token = data.token



            if (typeof token === 'undefined') {

                Alert.alert('Não foi possível fazer login')

            }

            else {

                Alert.alert('Login feito com sucesso')

            }

        })

    })

}

import {Alert} from 'react-native';



export function auth(username, password) {

    fetch('https://suap.ifrn.edu.br:443/api/v2/autenticacao/token/',

    {

        method: 'POST',

        headers: {

            'Accept': 'application/json',

            'Content-Type': 'application/json',

            'x-csrftoken': 'NDML6yy6HgTUIoypfWMZHMKZ32lgJf5PsNolVnLgewanw5YM4rqwkuvgkyAhEYEA'

        },

        body: JSON.stringify({

          username: username.toString(),

          password: password.toString()

        })

    }).then(function(response) {

        var json = response.json()

        json.then((data) => {

            token = data.token



            if (typeof token === 'undefined') {

                Alert.alert('Não foi possível fazer login')

            }

            else {

                Alert.alert('Login feito com sucesso')

            }

        })

    })

}

javascript reactjs react-native

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

asked Nov 24 '18 at 17:34

B. Vilela

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

asked Nov 24 '18 at 17:34

B. Vilela

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

edited Nov 24 '18 at 18:08

Heretic Monkey

6,58863673

asked Nov 24 '18 at 17:34

B. Vilela

asked Nov 24 '18 at 17:34

B. Vilela

asked Nov 24 '18 at 17:34

B. Vilela

1

What's going on here? => auth((this.state.username, this.state.password)). You're using double parentheses for some reason. Isn't that giving you an error? Try removing one set and see if that makes a difference.

– Andy
Nov 24 '18 at 17:39

What happens when you throw a console.log('password:', password) right before your fetch call? Make sure you're actually passing the data to the function. The error indicates you might not be passing the data

– mccambridge
Nov 24 '18 at 18:13

add a comment |

1

What's going on here? => auth((this.state.username, this.state.password)). You're using double parentheses for some reason. Isn't that giving you an error? Try removing one set and see if that makes a difference.

– Andy
Nov 24 '18 at 17:39

What happens when you throw a console.log('password:', password) right before your fetch call? Make sure you're actually passing the data to the function. The error indicates you might not be passing the data

– mccambridge
Nov 24 '18 at 18:13

What's going on here? => auth((this.state.username, this.state.password)). You're using double parentheses for some reason. Isn't that giving you an error? Try removing one set and see if that makes a difference.

– Andy
Nov 24 '18 at 17:39

What happens when you throw a console.log('password:', password) right before your fetch call? Make sure you're actually passing the data to the function. The error indicates you might not be passing the data

– mccambridge
Nov 24 '18 at 18:13

add a comment |

3 Answers
3

active

oldest

votes

I think, because of that password or username is null or undefined at that moment. You can check if they are defined and they are strings as below,

body: JSON.stringify({

 username: typeof username === 'string' ? username.toString() : '',

 password: typeof password === 'string' ? password.toString() : ''

})

and your view should be changed as follow,

onPress={() => auth(this.state.username, this.state.password)}

edited Nov 24 '18 at 18:29

answered Nov 24 '18 at 18:18

dinindu

2,13211224

add a comment |

Delete extra brackets from onPress.

auth(this.state.username, this.state.password)

answered Nov 24 '18 at 18:18

akcoban

531111

add a comment |

Change this

<TouchableOpacity

  style={styles.button}

  onPress={() => auth((this.state.username, this.state.password))}

>

<TouchableOpacity

  style={styles.button}

  onPress={() => auth(this.state.username, this.state.password)}

>

Also, whenever you're accessing objects with dot operator (.toString()), it's safe to check if the object is present in the first place.

So it's a good idea to convert this

body: JSON.stringify({

  username: username.toString(),

  password: password.toString()

})

body: JSON.stringify({

  username: username && username.toString(),

  password: password && password.toString()

})

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

I think, because of that password or username is null or undefined at that moment. You can check if they are defined and they are strings as below,

body: JSON.stringify({

 username: typeof username === 'string' ? username.toString() : '',

 password: typeof password === 'string' ? password.toString() : ''

})

and your view should be changed as follow,

onPress={() => auth(this.state.username, this.state.password)}

edited Nov 24 '18 at 18:29

answered Nov 24 '18 at 18:18

dinindu

2,13211224

add a comment |

I think, because of that password or username is null or undefined at that moment. You can check if they are defined and they are strings as below,

body: JSON.stringify({

 username: typeof username === 'string' ? username.toString() : '',

 password: typeof password === 'string' ? password.toString() : ''

})

and your view should be changed as follow,

onPress={() => auth(this.state.username, this.state.password)}

edited Nov 24 '18 at 18:29

answered Nov 24 '18 at 18:18

dinindu

2,13211224

add a comment |

I think, because of that password or username is null or undefined at that moment. You can check if they are defined and they are strings as below,

body: JSON.stringify({

 username: typeof username === 'string' ? username.toString() : '',

 password: typeof password === 'string' ? password.toString() : ''

})

and your view should be changed as follow,

onPress={() => auth(this.state.username, this.state.password)}

edited Nov 24 '18 at 18:29

answered Nov 24 '18 at 18:18

dinindu

2,13211224

I think, because of that password or username is null or undefined at that moment. You can check if they are defined and they are strings as below,

body: JSON.stringify({

 username: typeof username === 'string' ? username.toString() : '',

 password: typeof password === 'string' ? password.toString() : ''

})

and your view should be changed as follow,

onPress={() => auth(this.state.username, this.state.password)}

edited Nov 24 '18 at 18:29

answered Nov 24 '18 at 18:18

dinindu

2,13211224

edited Nov 24 '18 at 18:29

answered Nov 24 '18 at 18:18

dinindu

2,13211224

answered Nov 24 '18 at 18:18

dinindu

2,13211224

answered Nov 24 '18 at 18:18

dinindu

2,13211224

add a comment |

Delete extra brackets from onPress.

auth(this.state.username, this.state.password)

answered Nov 24 '18 at 18:18

akcoban

531111

add a comment |

Delete extra brackets from onPress.

auth(this.state.username, this.state.password)

answered Nov 24 '18 at 18:18

akcoban

531111

add a comment |

Delete extra brackets from onPress.

auth(this.state.username, this.state.password)

answered Nov 24 '18 at 18:18

akcoban

531111

Delete extra brackets from onPress.

auth(this.state.username, this.state.password)

answered Nov 24 '18 at 18:18

akcoban

531111

answered Nov 24 '18 at 18:18

akcoban

531111

answered Nov 24 '18 at 18:18

akcoban

531111

answered Nov 24 '18 at 18:18

akcoban

531111

add a comment |

Change this

<TouchableOpacity

  style={styles.button}

  onPress={() => auth((this.state.username, this.state.password))}

>

<TouchableOpacity

  style={styles.button}

  onPress={() => auth(this.state.username, this.state.password)}

>

Also, whenever you're accessing objects with dot operator (.toString()), it's safe to check if the object is present in the first place.

So it's a good idea to convert this

body: JSON.stringify({

  username: username.toString(),

  password: password.toString()

})

body: JSON.stringify({

  username: username && username.toString(),

  password: password && password.toString()

})

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

add a comment |

Change this

<TouchableOpacity

  style={styles.button}

  onPress={() => auth((this.state.username, this.state.password))}

>

<TouchableOpacity

  style={styles.button}

  onPress={() => auth(this.state.username, this.state.password)}

>

Also, whenever you're accessing objects with dot operator (.toString()), it's safe to check if the object is present in the first place.

So it's a good idea to convert this

body: JSON.stringify({

  username: username.toString(),

  password: password.toString()

})

body: JSON.stringify({

  username: username && username.toString(),

  password: password && password.toString()

})

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

add a comment |

Change this

<TouchableOpacity

  style={styles.button}

  onPress={() => auth((this.state.username, this.state.password))}

>

<TouchableOpacity

  style={styles.button}

  onPress={() => auth(this.state.username, this.state.password)}

>

Also, whenever you're accessing objects with dot operator (.toString()), it's safe to check if the object is present in the first place.

So it's a good idea to convert this

body: JSON.stringify({

  username: username.toString(),

  password: password.toString()

})

body: JSON.stringify({

  username: username && username.toString(),

  password: password && password.toString()

})

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

Change this

<TouchableOpacity

  style={styles.button}

  onPress={() => auth((this.state.username, this.state.password))}

>

<TouchableOpacity

  style={styles.button}

  onPress={() => auth(this.state.username, this.state.password)}

>

Also, whenever you're accessing objects with dot operator (.toString()), it's safe to check if the object is present in the first place.

So it's a good idea to convert this

body: JSON.stringify({

  username: username.toString(),

  password: password.toString()

})

body: JSON.stringify({

  username: username && username.toString(),

  password: password && password.toString()

})

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

answered Nov 24 '18 at 18:40

Dinesh Pandiyan

2,79811028

add a comment |

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