Undefined is not an object (evaluating 'this.props.navigation.navigate') React native












0














what I'm trying to do is to custom android back buttom, so when I'm in a screen, when I press the back button, the screen must navigate through the MyProducts, but I'm receiving this error



import React, { Component } from 'react';
import { View, StyleSheet, Text, Keyboard, Animated } from 'react-native';
import { Textarea, Form, Item, Input, Label, Button } from 'native-base';
import jwt_decode from 'jwt-decode';

class CreateProduct extends Component {
constructor(props) {
super(props);
this.keyboardHeight = new Animated.Value(0);
this.imageHeight = new Animated.Value(199);

this.state = {
isButtonsHidden: false,
title: null,
description: '',
isDialogVisible: false,
messageError: '',
};
}

registerProduct = () => {
const { state } = this.props.navigation;
const token = state.params ? state.params.token : undefined;
const user = jwt_decode(token);

fetch(createProductPath, {
method: 'POST',
body: formData,
headers: {
'Accept': 'application/json',
'Content-Type': 'multipart/form-data',
},
})
.then((response) => {
return response.json();
})
.then((responseJson) => {
if (responseJson.error != null) {
this.setState({ messageError: responseJson.error })
this.setState({ isDialogVisible: true })
}
else {
this.props.navigation.navigate('MyProducts', { token: token });
}
})
}

componentDidMount() {
BackHandler.addEventListener('hardwareBackPress', this.handleBackButton);
}
componentWillUnmount() {
BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton);
}

handleBackButton() {
this.props.navigation.navigate('MyProducts', { token: token });
return true;
}

render() {
const { state } = this.props.navigation;
var token = state.params ? state.params.token : undefined;

return (
<Animated.View
style={[styles.container, { paddingBottom: this.keyboardHeight }]}
>
<Form style={styles.description}>
<Item floatingLabel>
<Label>Title</Label>
<Input
onChangeText={(title) => { this.setState({ title }) }}
/>
</Item>
<Textarea
onChangeText={(description) => { this.setState({ description }) }}
/>
</Form>
<ToogleView hide={this.state.isButtonsHidden}>
<View style={styles.buttonContainer}>
<Button
onPress={() => { this.props.navigation.navigate('MyProducts', { token: token }); }}
danger
>
<Text style={{ color: 'white' }}> CANCEL </Text>
</Button>
<Button
onPress={this.registerProduct}
success
>
<Text style={{ color: 'white' }}> SAVE </Text>
</Button>
</View>
</ToogleView>
</Animated.View>
);
}
}
export default CreateProduct;

const styles = StyleSheet.create({
container: {
backgroundColor: 'white',
flex: 1
},
description: {
flex: 1,
height: '35%',
width: '95%',
},
buttonContainer: {
flexDirection: 'row',
justifyContent: 'space-around',
paddingBottom: 10,
},
});


For reasons unknown to me, my props is undefined when i saw it with a console.log, so I can't pass throught the



handleBackButton() {
this.props.navigation.navigate('MyProducts', { token: token });
}



Is there a good way to do this? I appreciate.










share|improve this question





























    0














    what I'm trying to do is to custom android back buttom, so when I'm in a screen, when I press the back button, the screen must navigate through the MyProducts, but I'm receiving this error



    import React, { Component } from 'react';
    import { View, StyleSheet, Text, Keyboard, Animated } from 'react-native';
    import { Textarea, Form, Item, Input, Label, Button } from 'native-base';
    import jwt_decode from 'jwt-decode';

    class CreateProduct extends Component {
    constructor(props) {
    super(props);
    this.keyboardHeight = new Animated.Value(0);
    this.imageHeight = new Animated.Value(199);

    this.state = {
    isButtonsHidden: false,
    title: null,
    description: '',
    isDialogVisible: false,
    messageError: '',
    };
    }

    registerProduct = () => {
    const { state } = this.props.navigation;
    const token = state.params ? state.params.token : undefined;
    const user = jwt_decode(token);

    fetch(createProductPath, {
    method: 'POST',
    body: formData,
    headers: {
    'Accept': 'application/json',
    'Content-Type': 'multipart/form-data',
    },
    })
    .then((response) => {
    return response.json();
    })
    .then((responseJson) => {
    if (responseJson.error != null) {
    this.setState({ messageError: responseJson.error })
    this.setState({ isDialogVisible: true })
    }
    else {
    this.props.navigation.navigate('MyProducts', { token: token });
    }
    })
    }

    componentDidMount() {
    BackHandler.addEventListener('hardwareBackPress', this.handleBackButton);
    }
    componentWillUnmount() {
    BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton);
    }

    handleBackButton() {
    this.props.navigation.navigate('MyProducts', { token: token });
    return true;
    }

    render() {
    const { state } = this.props.navigation;
    var token = state.params ? state.params.token : undefined;

    return (
    <Animated.View
    style={[styles.container, { paddingBottom: this.keyboardHeight }]}
    >
    <Form style={styles.description}>
    <Item floatingLabel>
    <Label>Title</Label>
    <Input
    onChangeText={(title) => { this.setState({ title }) }}
    />
    </Item>
    <Textarea
    onChangeText={(description) => { this.setState({ description }) }}
    />
    </Form>
    <ToogleView hide={this.state.isButtonsHidden}>
    <View style={styles.buttonContainer}>
    <Button
    onPress={() => { this.props.navigation.navigate('MyProducts', { token: token }); }}
    danger
    >
    <Text style={{ color: 'white' }}> CANCEL </Text>
    </Button>
    <Button
    onPress={this.registerProduct}
    success
    >
    <Text style={{ color: 'white' }}> SAVE </Text>
    </Button>
    </View>
    </ToogleView>
    </Animated.View>
    );
    }
    }
    export default CreateProduct;

    const styles = StyleSheet.create({
    container: {
    backgroundColor: 'white',
    flex: 1
    },
    description: {
    flex: 1,
    height: '35%',
    width: '95%',
    },
    buttonContainer: {
    flexDirection: 'row',
    justifyContent: 'space-around',
    paddingBottom: 10,
    },
    });


    For reasons unknown to me, my props is undefined when i saw it with a console.log, so I can't pass throught the



    handleBackButton() {
    this.props.navigation.navigate('MyProducts', { token: token });
    }



    Is there a good way to do this? I appreciate.










    share|improve this question



























      0












      0








      0







      what I'm trying to do is to custom android back buttom, so when I'm in a screen, when I press the back button, the screen must navigate through the MyProducts, but I'm receiving this error



      import React, { Component } from 'react';
      import { View, StyleSheet, Text, Keyboard, Animated } from 'react-native';
      import { Textarea, Form, Item, Input, Label, Button } from 'native-base';
      import jwt_decode from 'jwt-decode';

      class CreateProduct extends Component {
      constructor(props) {
      super(props);
      this.keyboardHeight = new Animated.Value(0);
      this.imageHeight = new Animated.Value(199);

      this.state = {
      isButtonsHidden: false,
      title: null,
      description: '',
      isDialogVisible: false,
      messageError: '',
      };
      }

      registerProduct = () => {
      const { state } = this.props.navigation;
      const token = state.params ? state.params.token : undefined;
      const user = jwt_decode(token);

      fetch(createProductPath, {
      method: 'POST',
      body: formData,
      headers: {
      'Accept': 'application/json',
      'Content-Type': 'multipart/form-data',
      },
      })
      .then((response) => {
      return response.json();
      })
      .then((responseJson) => {
      if (responseJson.error != null) {
      this.setState({ messageError: responseJson.error })
      this.setState({ isDialogVisible: true })
      }
      else {
      this.props.navigation.navigate('MyProducts', { token: token });
      }
      })
      }

      componentDidMount() {
      BackHandler.addEventListener('hardwareBackPress', this.handleBackButton);
      }
      componentWillUnmount() {
      BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton);
      }

      handleBackButton() {
      this.props.navigation.navigate('MyProducts', { token: token });
      return true;
      }

      render() {
      const { state } = this.props.navigation;
      var token = state.params ? state.params.token : undefined;

      return (
      <Animated.View
      style={[styles.container, { paddingBottom: this.keyboardHeight }]}
      >
      <Form style={styles.description}>
      <Item floatingLabel>
      <Label>Title</Label>
      <Input
      onChangeText={(title) => { this.setState({ title }) }}
      />
      </Item>
      <Textarea
      onChangeText={(description) => { this.setState({ description }) }}
      />
      </Form>
      <ToogleView hide={this.state.isButtonsHidden}>
      <View style={styles.buttonContainer}>
      <Button
      onPress={() => { this.props.navigation.navigate('MyProducts', { token: token }); }}
      danger
      >
      <Text style={{ color: 'white' }}> CANCEL </Text>
      </Button>
      <Button
      onPress={this.registerProduct}
      success
      >
      <Text style={{ color: 'white' }}> SAVE </Text>
      </Button>
      </View>
      </ToogleView>
      </Animated.View>
      );
      }
      }
      export default CreateProduct;

      const styles = StyleSheet.create({
      container: {
      backgroundColor: 'white',
      flex: 1
      },
      description: {
      flex: 1,
      height: '35%',
      width: '95%',
      },
      buttonContainer: {
      flexDirection: 'row',
      justifyContent: 'space-around',
      paddingBottom: 10,
      },
      });


      For reasons unknown to me, my props is undefined when i saw it with a console.log, so I can't pass throught the



      handleBackButton() {
      this.props.navigation.navigate('MyProducts', { token: token });
      }



      Is there a good way to do this? I appreciate.










      share|improve this question















      what I'm trying to do is to custom android back buttom, so when I'm in a screen, when I press the back button, the screen must navigate through the MyProducts, but I'm receiving this error



      import React, { Component } from 'react';
      import { View, StyleSheet, Text, Keyboard, Animated } from 'react-native';
      import { Textarea, Form, Item, Input, Label, Button } from 'native-base';
      import jwt_decode from 'jwt-decode';

      class CreateProduct extends Component {
      constructor(props) {
      super(props);
      this.keyboardHeight = new Animated.Value(0);
      this.imageHeight = new Animated.Value(199);

      this.state = {
      isButtonsHidden: false,
      title: null,
      description: '',
      isDialogVisible: false,
      messageError: '',
      };
      }

      registerProduct = () => {
      const { state } = this.props.navigation;
      const token = state.params ? state.params.token : undefined;
      const user = jwt_decode(token);

      fetch(createProductPath, {
      method: 'POST',
      body: formData,
      headers: {
      'Accept': 'application/json',
      'Content-Type': 'multipart/form-data',
      },
      })
      .then((response) => {
      return response.json();
      })
      .then((responseJson) => {
      if (responseJson.error != null) {
      this.setState({ messageError: responseJson.error })
      this.setState({ isDialogVisible: true })
      }
      else {
      this.props.navigation.navigate('MyProducts', { token: token });
      }
      })
      }

      componentDidMount() {
      BackHandler.addEventListener('hardwareBackPress', this.handleBackButton);
      }
      componentWillUnmount() {
      BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton);
      }

      handleBackButton() {
      this.props.navigation.navigate('MyProducts', { token: token });
      return true;
      }

      render() {
      const { state } = this.props.navigation;
      var token = state.params ? state.params.token : undefined;

      return (
      <Animated.View
      style={[styles.container, { paddingBottom: this.keyboardHeight }]}
      >
      <Form style={styles.description}>
      <Item floatingLabel>
      <Label>Title</Label>
      <Input
      onChangeText={(title) => { this.setState({ title }) }}
      />
      </Item>
      <Textarea
      onChangeText={(description) => { this.setState({ description }) }}
      />
      </Form>
      <ToogleView hide={this.state.isButtonsHidden}>
      <View style={styles.buttonContainer}>
      <Button
      onPress={() => { this.props.navigation.navigate('MyProducts', { token: token }); }}
      danger
      >
      <Text style={{ color: 'white' }}> CANCEL </Text>
      </Button>
      <Button
      onPress={this.registerProduct}
      success
      >
      <Text style={{ color: 'white' }}> SAVE </Text>
      </Button>
      </View>
      </ToogleView>
      </Animated.View>
      );
      }
      }
      export default CreateProduct;

      const styles = StyleSheet.create({
      container: {
      backgroundColor: 'white',
      flex: 1
      },
      description: {
      flex: 1,
      height: '35%',
      width: '95%',
      },
      buttonContainer: {
      flexDirection: 'row',
      justifyContent: 'space-around',
      paddingBottom: 10,
      },
      });


      For reasons unknown to me, my props is undefined when i saw it with a console.log, so I can't pass throught the



      handleBackButton() {
      this.props.navigation.navigate('MyProducts', { token: token });
      }



      Is there a good way to do this? I appreciate.







      android reactjs react-native react-navigation






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 24 '18 at 16:51

























      asked Nov 23 '18 at 4:37









      yoongi_s

      74




      74
























          2 Answers
          2






          active

          oldest

          votes


















          0














          Make handleBackButton function as arrow function



          handleBackButton = () => {
          this.props.navigation.navigate('MyProducts', { token: token });
          return true
          }





          share|improve this answer





























            0














            Can you try changing your calls to handleBackButton to bind to this?



              componentDidMount() {
            BackHandler.addEventListener('hardwareBackPress', this.handleBackButton.bind(this));
            }
            componentWillUnmount() {
            BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton.bind(this));
            }

            handleBackButton() {
            this.props.navigation.navigate('MyProducts', { token: token });
            return true;
            }





            share|improve this answer





















            • Yes, I've tried, but the error still appears. @Abinesh answer solved it. Thanks anyway :)
              – yoongi_s
              Nov 25 '18 at 19:17











            Your Answer






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            2 Answers
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            2 Answers
            2






            active

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            active

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            active

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            0














            Make handleBackButton function as arrow function



            handleBackButton = () => {
            this.props.navigation.navigate('MyProducts', { token: token });
            return true
            }





            share|improve this answer


























              0














              Make handleBackButton function as arrow function



              handleBackButton = () => {
              this.props.navigation.navigate('MyProducts', { token: token });
              return true
              }





              share|improve this answer
























                0












                0








                0






                Make handleBackButton function as arrow function



                handleBackButton = () => {
                this.props.navigation.navigate('MyProducts', { token: token });
                return true
                }





                share|improve this answer












                Make handleBackButton function as arrow function



                handleBackButton = () => {
                this.props.navigation.navigate('MyProducts', { token: token });
                return true
                }






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 23 '18 at 4:42









                Abinesh Joyel

                1,0321511




                1,0321511

























                    0














                    Can you try changing your calls to handleBackButton to bind to this?



                      componentDidMount() {
                    BackHandler.addEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }
                    componentWillUnmount() {
                    BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }

                    handleBackButton() {
                    this.props.navigation.navigate('MyProducts', { token: token });
                    return true;
                    }





                    share|improve this answer





















                    • Yes, I've tried, but the error still appears. @Abinesh answer solved it. Thanks anyway :)
                      – yoongi_s
                      Nov 25 '18 at 19:17
















                    0














                    Can you try changing your calls to handleBackButton to bind to this?



                      componentDidMount() {
                    BackHandler.addEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }
                    componentWillUnmount() {
                    BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }

                    handleBackButton() {
                    this.props.navigation.navigate('MyProducts', { token: token });
                    return true;
                    }





                    share|improve this answer





















                    • Yes, I've tried, but the error still appears. @Abinesh answer solved it. Thanks anyway :)
                      – yoongi_s
                      Nov 25 '18 at 19:17














                    0












                    0








                    0






                    Can you try changing your calls to handleBackButton to bind to this?



                      componentDidMount() {
                    BackHandler.addEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }
                    componentWillUnmount() {
                    BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }

                    handleBackButton() {
                    this.props.navigation.navigate('MyProducts', { token: token });
                    return true;
                    }





                    share|improve this answer












                    Can you try changing your calls to handleBackButton to bind to this?



                      componentDidMount() {
                    BackHandler.addEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }
                    componentWillUnmount() {
                    BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton.bind(this));
                    }

                    handleBackButton() {
                    this.props.navigation.navigate('MyProducts', { token: token });
                    return true;
                    }






                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered Nov 24 '18 at 17:56









                    Kevin van Zyl

                    109110




                    109110












                    • Yes, I've tried, but the error still appears. @Abinesh answer solved it. Thanks anyway :)
                      – yoongi_s
                      Nov 25 '18 at 19:17


















                    • Yes, I've tried, but the error still appears. @Abinesh answer solved it. Thanks anyway :)
                      – yoongi_s
                      Nov 25 '18 at 19:17
















                    Yes, I've tried, but the error still appears. @Abinesh answer solved it. Thanks anyway :)
                    – yoongi_s
                    Nov 25 '18 at 19:17




                    Yes, I've tried, but the error still appears. @Abinesh answer solved it. Thanks anyway :)
                    – yoongi_s
                    Nov 25 '18 at 19:17


















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