How to null check and navigate to new screen on click submit when textinput and submit button both are in different js files in react native? - react-native

Question

render(){
return (
<ImageBackground
source={require('../images/back02.png')}
style={styles.bgscreen}
>
<KeyboardAvoidingView behavior='position'>
<Image
style={styles.headImage}
source={require('../images/login_img.png')}
/>
<ImgBack/>
</KeyboardAvoidingView>
<BottomButton navigation={this.props.navigation} />
</ImageBackground>
);}
}
ImgBack contains username and password textinput.
BottomButton contains the submit button
I want to navigate to new activity when submit button clicked. navigation to new screen is working perfectly but before navigating i want to null check the TextInput which are on
I am new to React-Native. Complete Beginner here. I want even know what to do. Help.
ImgBack.js file
class imgBack extends React.Component {
constructor()
{
super();
this.state = { hidePassword: true }
}
managePasswordVisibility = () =>
{
this.setState({ hidePassword: !this.state.hidePassword });
}
usernameValidate = (EnteredValue) =>{
var TextLength = EnteredValue.length.toString();
if(TextLength == 10 ){
Alert.alert("Sorry, You have reached the maximum input limit.")
}
else if(TextLength == 0){
Alert.alert("Username can't be blank")
}
}
passValidate = (EnteredValue) =>{
var TextLength = EnteredValue.length.toString();
if(TextLength == 10 ){
Alert.alert("Sorry, You have reached the maximum input limit.")
}
else if(TextLength == 0){
Alert.alert("Username can't be blank")
}
}
render(){
return (
<ImageBackground resizeMode='contain'
source={require('../images/login_back.png')}
style={{
marginHorizontal: 10,
height: 290,
padding: 30,
}}>
<View style={
styles.textInputContainer
} >
<TextInput
placeholder="Username"
underlineColorAndroid = "transparent"
placeholderTextColor="#000000"
maxLength={10}
onChangeText={ EnteredValue => this.usernameValidate(EnteredValue) }
/>
</View>
<View style = { styles.textInputContainer }>
<TextInput
onChangeText={ EnteredValue => this.passValidate(EnteredValue) }
underlineColorAndroid = "transparent"
secureTextEntry = { this.state.hidePassword }
placeholder="Password"
placeholderTextColor="#000"
/>
<TouchableOpacity style = { styles.visibilityBtn } onPress = { this.managePasswordVisibility }>
<Image source = { ( this.state.hidePassword ) ? require('../images/eye_close_icon.imageset/eye_close_icon.png') : require('../images/eye_icon.imageset/eye_icon.png') } style = { styles.btnImage } />
</TouchableOpacity>
</View>
</ImageBackground>
)
}
} ```
**Bottombutton File**
class bottomButon extends Component {
render(){
return (
<ImageBackground
style={{ height: 80, marginLeft: '20%', marginTop: 10 }}
resizeMode={'center'}
source={require('../images/btn_back.png')} >
<TouchableOpacity
onPress={ this.login } >
<Text style={{ textAlign: 'center', marginTop: 25 }}>Submit & SYNC</Text>
</TouchableOpacity>
</ImageBackground>
)
} }
export default bottomButon; ```

Answer 1

solution:
constructor(props) {
super(props);
this.state = {
hidePassword: true,
username: '',
password: '',
};
}
validUserPass = async () => {
try {
if (this.state.username === '') {
Alert.alert('Username is required !');
} else if (this.state.password === '') {
Alert.alert('Password is required !');
} else {
this.props.navigation.navigate('selectEmoji');
}
} catch (error) {
console.warn(error);
}
};
it helped me solve my issue.