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How to initialize picker values based on state in react-native

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0

I have developed a picker for setting day and night. I getting the current time for a picker value from a API and trying to set with setState, but every time it will display 'day' as a value. I want it should display based on the value passed.

 this.state= 
 time : null
 


 timeMode = (Currenttime) => //here if the passed value is 'night' then it should set the value to night. 
 //Then when clicking on picker it should be both values in dropdown
 this.setState( time: Currenttime ); // this causes infinite loop...
 return (
 <View style=Styles.paddingStyle>
 <Picker
 selectedValue=this.state.time
 mode="dropdown"
 onValueChange=(value) => this.setState(time: value)
 >
 this.DropdownValues()
 </Picker>
 </View>
 )


DropdownValues = () => 
 const time = [
 'day',
 'night'
 ];
 return time.map(data => 
 return <Picker.Item label=data value=data />;
 );
;

javascript react-native state picker

share|improve this question

edited Mar 26 at 13:27

begin js

asked Mar 25 at 13:25

begin jsbegin js

133 bronze badges

add a comment | 

0

I have developed a picker for setting day and night. I getting the current time for a picker value from a API and trying to set with setState, but every time it will display 'day' as a value. I want it should display based on the value passed.

 this.state= 
 time : null
 


 timeMode = (Currenttime) => //here if the passed value is 'night' then it should set the value to night. 
 //Then when clicking on picker it should be both values in dropdown
 this.setState( time: Currenttime ); // this causes infinite loop...
 return (
 <View style=Styles.paddingStyle>
 <Picker
 selectedValue=this.state.time
 mode="dropdown"
 onValueChange=(value) => this.setState(time: value)
 >
 this.DropdownValues()
 </Picker>
 </View>
 )


DropdownValues = () => 
 const time = [
 'day',
 'night'
 ];
 return time.map(data => 
 return <Picker.Item label=data value=data />;
 );
;

javascript react-native state picker

share|improve this question

edited Mar 26 at 13:27

begin js

asked Mar 25 at 13:25

begin jsbegin js

133 bronze badges

add a comment | 

I have developed a picker for setting day and night. I getting the current time for a picker value from a API and trying to set with setState, but every time it will display 'day' as a value. I want it should display based on the value passed.

 this.state= 
 time : null
 


 timeMode = (Currenttime) => //here if the passed value is 'night' then it should set the value to night. 
 //Then when clicking on picker it should be both values in dropdown
 this.setState( time: Currenttime ); // this causes infinite loop...
 return (
 <View style=Styles.paddingStyle>
 <Picker
 selectedValue=this.state.time
 mode="dropdown"
 onValueChange=(value) => this.setState(time: value)
 >
 this.DropdownValues()
 </Picker>
 </View>
 )


DropdownValues = () => 
 const time = [
 'day',
 'night'
 ];
 return time.map(data => 
 return <Picker.Item label=data value=data />;
 );
;

javascript react-native state picker

share|improve this question

edited Mar 26 at 13:27

begin js

asked Mar 25 at 13:25

begin jsbegin js

133 bronze badges

 this.state= 
 time : null
 


 timeMode = (Currenttime) => //here if the passed value is 'night' then it should set the value to night. 
 //Then when clicking on picker it should be both values in dropdown
 this.setState( time: Currenttime ); // this causes infinite loop...
 return (
 <View style=Styles.paddingStyle>
 <Picker
 selectedValue=this.state.time
 mode="dropdown"
 onValueChange=(value) => this.setState(time: value)
 >
 this.DropdownValues()
 </Picker>
 </View>
 )


DropdownValues = () => 
 const time = [
 'day',
 'night'
 ];
 return time.map(data => 
 return <Picker.Item label=data value=data />;
 );
;

share|improve this question

edited Mar 26 at 13:27

begin js

asked Mar 25 at 13:25

begin jsbegin js

133 bronze badges

share|improve this question

edited Mar 26 at 13:27

begin js

asked Mar 25 at 13:25

begin jsbegin js

133 bronze badges

asked Mar 25 at 13:25

begin jsbegin js

133 bronze badges

asked Mar 25 at 13:25

begin jsbegin js

133 bronze badges