Change specific buttons background onPress (React Native)
0
I'm trying to build a simple quiz. I would like to change the background of a button to green if it's correct and to red if it's incorrect onPress. My questions is how do I select only ONE of the buttons? Currently I can only get all of the buttons to turn colour.
export default class TestScreen extends React.Component {
constructor(props){
super(props);
this.qno = 0
this.score = 0
const jdata = jsonData.quiz.quiz1
arrnew = Object.keys(jdata).map( function(k) { return jdata[k] });
this.state = {
question : arrnew[this.qno].question,
options : arrnew[this.qno].options,
correctoption : arrnew[this.qno].correctoption,
countCheck : 0,
back_colour: 'gray',
answered: false,
}
}
change_colour(ans) {
if(this.state.answered == false){
if(ans == this.state.correctoption){
Alert.alert('Correct!');
this.setState({ back_colour: 'green'})
}
else {
Alert.alert('Wrong!');
this.setState({ back_colour: 'red'})
}
this.setState({ answered: true })
}
else {
// Do nothing
}
}
render() {
let _this = this
const currentOptions = this.state.options
const options = Object.keys(currentOptions).map( function(k) {
return ( <View key={k} style={{margin:10}}>
<Button color={_this.state.back_colour} onPress={() => _this.change_colour(k)} title={currentOptions[k]} />
</View>)
});
}
}
react-native
asked Dec 28 '18 at 18:00
GRSGRS
412625
add a comment |
0
I'm trying to build a simple quiz. I would like to change the background of a button to green if it's correct and to red if it's incorrect onPress. My questions is how do I select only ONE of the buttons? Currently I can only get all of the buttons to turn colour.
export default class TestScreen extends React.Component {
constructor(props){
super(props);
this.qno = 0
this.score = 0
const jdata = jsonData.quiz.quiz1
arrnew = Object.keys(jdata).map( function(k) { return jdata[k] });
this.state = {
question : arrnew[this.qno].question,
options : arrnew[this.qno].options,
correctoption : arrnew[this.qno].correctoption,
countCheck : 0,
back_colour: 'gray',
answered: false,
}
}
change_colour(ans) {
if(this.state.answered == false){
if(ans == this.state.correctoption){
Alert.alert('Correct!');
this.setState({ back_colour: 'green'})
}
else {
Alert.alert('Wrong!');
this.setState({ back_colour: 'red'})
}
this.setState({ answered: true })
}
else {
// Do nothing
}
}
render() {
let _this = this
const currentOptions = this.state.options
const options = Object.keys(currentOptions).map( function(k) {
return ( <View key={k} style={{margin:10}}>
<Button color={_this.state.back_colour} onPress={() => _this.change_colour(k)} title={currentOptions[k]} />
</View>)
});
}
}
react-native
asked Dec 28 '18 at 18:00
GRSGRS
412625
add a comment |
0
0
0
I'm trying to build a simple quiz. I would like to change the background of a button to green if it's correct and to red if it's incorrect onPress. My questions is how do I select only ONE of the buttons? Currently I can only get all of the buttons to turn colour.
export default class TestScreen extends React.Component {
constructor(props){
super(props);
this.qno = 0
this.score = 0
const jdata = jsonData.quiz.quiz1
arrnew = Object.keys(jdata).map( function(k) { return jdata[k] });
this.state = {
question : arrnew[this.qno].question,
options : arrnew[this.qno].options,
correctoption : arrnew[this.qno].correctoption,
countCheck : 0,
back_colour: 'gray',
answered: false,
}
}
change_colour(ans) {
if(this.state.answered == false){
if(ans == this.state.correctoption){
Alert.alert('Correct!');
this.setState({ back_colour: 'green'})
}
else {
Alert.alert('Wrong!');
this.setState({ back_colour: 'red'})
}
this.setState({ answered: true })
}
else {
// Do nothing
}
}
render() {
let _this = this
const currentOptions = this.state.options
const options = Object.keys(currentOptions).map( function(k) {
return ( <View key={k} style={{margin:10}}>
<Button color={_this.state.back_colour} onPress={() => _this.change_colour(k)} title={currentOptions[k]} />
</View>)
});
}
}
react-native
asked Dec 28 '18 at 18:00
GRSGRS
412625
I'm trying to build a simple quiz. I would like to change the background of a button to green if it's correct and to red if it's incorrect onPress. My questions is how do I select only ONE of the buttons? Currently I can only get all of the buttons to turn colour.
export default class TestScreen extends React.Component {
constructor(props){
super(props);
this.qno = 0
this.score = 0
const jdata = jsonData.quiz.quiz1
arrnew = Object.keys(jdata).map( function(k) { return jdata[k] });
this.state = {
question : arrnew[this.qno].question,
options : arrnew[this.qno].options,
correctoption : arrnew[this.qno].correctoption,
countCheck : 0,
back_colour: 'gray',
answered: false,
}
}
change_colour(ans) {
if(this.state.answered == false){
if(ans == this.state.correctoption){
Alert.alert('Correct!');
this.setState({ back_colour: 'green'})
}
else {
Alert.alert('Wrong!');
this.setState({ back_colour: 'red'})
}
this.setState({ answered: true })
}
else {
// Do nothing
}
}
render() {
let _this = this
const currentOptions = this.state.options
const options = Object.keys(currentOptions).map( function(k) {
return ( <View key={k} style={{margin:10}}>
<Button color={_this.state.back_colour} onPress={() => _this.change_colour(k)} title={currentOptions[k]} />
</View>)
});
}
}
react-native
react-native
asked Dec 28 '18 at 18:00
GRSGRS
412625
asked Dec 28 '18 at 18:00
GRSGRS
412625
asked Dec 28 '18 at 18:00
GRSGRS
412625
asked Dec 28 '18 at 18:00
GRSGRS
412625
asked Dec 28 '18 at 18:00
GRSGRS
412625
412625
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
yeah its great and easy with react . You can use ids for this purpose.
example ..
validateUser = id => {
const newItems = items.map(item => {
if(item.id === id ) {
then check anwer here
and trun status true or false ..
}
})
}
items.map(item function() {
<Button color={item.status ? 'red' : 'black' } onPress={() =>
this.validateAnswer(item.id)}>
})
and your item object in your array should be like this ..
{
id: '0',
status: true/false
}
i think this will help .
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
yeah its great and easy with react . You can use ids for this purpose.
example ..
validateUser = id => {
const newItems = items.map(item => {
if(item.id === id ) {
then check anwer here
and trun status true or false ..
}
})
}
items.map(item function() {
<Button color={item.status ? 'red' : 'black' } onPress={() =>
this.validateAnswer(item.id)}>
})
and your item object in your array should be like this ..
{
id: '0',
status: true/false
}
i think this will help .
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
add a comment |
1
yeah its great and easy with react . You can use ids for this purpose.
example ..
validateUser = id => {
const newItems = items.map(item => {
if(item.id === id ) {
then check anwer here
and trun status true or false ..
}
})
}
items.map(item function() {
<Button color={item.status ? 'red' : 'black' } onPress={() =>
this.validateAnswer(item.id)}>
})
and your item object in your array should be like this ..
{
id: '0',
status: true/false
}
i think this will help .
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
add a comment |
1
1
1
yeah its great and easy with react . You can use ids for this purpose.
example ..
validateUser = id => {
const newItems = items.map(item => {
if(item.id === id ) {
then check anwer here
and trun status true or false ..
}
})
}
items.map(item function() {
<Button color={item.status ? 'red' : 'black' } onPress={() =>
this.validateAnswer(item.id)}>
})
and your item object in your array should be like this ..
{
id: '0',
status: true/false
}
i think this will help .
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
yeah its great and easy with react . You can use ids for this purpose.
example ..
validateUser = id => {
const newItems = items.map(item => {
if(item.id === id ) {
then check anwer here
and trun status true or false ..
}
})
}
items.map(item function() {
<Button color={item.status ? 'red' : 'black' } onPress={() =>
this.validateAnswer(item.id)}>
})
and your item object in your array should be like this ..
{
id: '0',
status: true/false
}
i think this will help .
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
answered Dec 28 '18 at 18:48
mohammad aquibmohammad aquib
362
362
add a comment |
add a comment |
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