Get the updated value using setState in react native
**
I have a TextInput and two buttons which are responsible to increment
or decrement the value of that TextInput. Using setState I am achieving
it. Everything is fine but after setState when I am consoling the
value it is showing me the previous value, but in TextInput I am
getting the updated value. The code is the following:-
**
state = {
cartItems:[
{
id:1,
count:0
},
{
id:2,
count:0
},
],
}
changeQuantity = (productId,action)=>{
this.setState(prevState=>{
return{
cartItems:prevState.cartItems.filter(single=>{
if(single.id==productId){
if(action==='plus'){
single.count++;
}
if(action==='minus' && single.count>0){
single.count--;
}
}
return single;
})
}
})
console.log(this.state.cartItems.find(single => single.id === productId).count)
/*This gives the previous value not the updated value*/
}
Why is this happening and what is the proper way to get the updated value??
react-native setstate
edited Nov 15 '18 at 5:18
Yossi
1,7952720
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
add a comment |
**
I have a TextInput and two buttons which are responsible to increment
or decrement the value of that TextInput. Using setState I am achieving
it. Everything is fine but after setState when I am consoling the
value it is showing me the previous value, but in TextInput I am
getting the updated value. The code is the following:-
**
state = {
cartItems:[
{
id:1,
count:0
},
{
id:2,
count:0
},
],
}
changeQuantity = (productId,action)=>{
this.setState(prevState=>{
return{
cartItems:prevState.cartItems.filter(single=>{
if(single.id==productId){
if(action==='plus'){
single.count++;
}
if(action==='minus' && single.count>0){
single.count--;
}
}
return single;
})
}
})
console.log(this.state.cartItems.find(single => single.id === productId).count)
/*This gives the previous value not the updated value*/
}
Why is this happening and what is the proper way to get the updated value??
react-native setstate
edited Nov 15 '18 at 5:18
Yossi
1,7952720
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
add a comment |
**
I have a TextInput and two buttons which are responsible to increment
or decrement the value of that TextInput. Using setState I am achieving
it. Everything is fine but after setState when I am consoling the
value it is showing me the previous value, but in TextInput I am
getting the updated value. The code is the following:-
**
state = {
cartItems:[
{
id:1,
count:0
},
{
id:2,
count:0
},
],
}
changeQuantity = (productId,action)=>{
this.setState(prevState=>{
return{
cartItems:prevState.cartItems.filter(single=>{
if(single.id==productId){
if(action==='plus'){
single.count++;
}
if(action==='minus' && single.count>0){
single.count--;
}
}
return single;
})
}
})
console.log(this.state.cartItems.find(single => single.id === productId).count)
/*This gives the previous value not the updated value*/
}
Why is this happening and what is the proper way to get the updated value??
react-native setstate
edited Nov 15 '18 at 5:18
Yossi
1,7952720
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
**
I have a TextInput and two buttons which are responsible to increment
or decrement the value of that TextInput. Using setState I am achieving
it. Everything is fine but after setState when I am consoling the
value it is showing me the previous value, but in TextInput I am
getting the updated value. The code is the following:-
**
state = {
cartItems:[
{
id:1,
count:0
},
{
id:2,
count:0
},
],
}
changeQuantity = (productId,action)=>{
this.setState(prevState=>{
return{
cartItems:prevState.cartItems.filter(single=>{
if(single.id==productId){
if(action==='plus'){
single.count++;
}
if(action==='minus' && single.count>0){
single.count--;
}
}
return single;
})
}
})
console.log(this.state.cartItems.find(single => single.id === productId).count)
/*This gives the previous value not the updated value*/
}
Why is this happening and what is the proper way to get the updated value??
react-native setstate
react-native setstate
edited Nov 15 '18 at 5:18
Yossi
1,7952720
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
edited Nov 15 '18 at 5:18
Yossi
1,7952720
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
edited Nov 15 '18 at 5:18
Yossi
1,7952720
edited Nov 15 '18 at 5:18
Yossi
1,7952720
edited Nov 15 '18 at 5:18
Yossi
1,7952720
1,7952720
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
asked Nov 15 '18 at 5:04
Sandip NagSandip Nag
140211
140211
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
setState is asynchronous. The place where you have written the console.log will still have previous value hence it will show you old value. Try adding console in setState completion block to print the updated value of state.
this.setState({
// update your state here
}, () => {
console.log('Updated value ');
});
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
Thank you very much, it works !
– Sandip Nag
Nov 15 '18 at 10:22
add a comment |
It you do a console to next line after setState has been called it
will log only previous state. I don't know why the behaviour exists. Try logging it in componentDidUpdate.
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
setState is asynchronous. The place where you have written the console.log will still have previous value hence it will show you old value. Try adding console in setState completion block to print the updated value of state.
this.setState({
// update your state here
}, () => {
console.log('Updated value ');
});
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
Thank you very much, it works !
– Sandip Nag
Nov 15 '18 at 10:22
add a comment |
setState is asynchronous. The place where you have written the console.log will still have previous value hence it will show you old value. Try adding console in setState completion block to print the updated value of state.
this.setState({
// update your state here
}, () => {
console.log('Updated value ');
});
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
Thank you very much, it works !
– Sandip Nag
Nov 15 '18 at 10:22
add a comment |
setState is asynchronous. The place where you have written the console.log will still have previous value hence it will show you old value. Try adding console in setState completion block to print the updated value of state.
this.setState({
// update your state here
}, () => {
console.log('Updated value ');
});
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
setState is asynchronous. The place where you have written the console.log will still have previous value hence it will show you old value. Try adding console in setState completion block to print the updated value of state.
this.setState({
// update your state here
}, () => {
console.log('Updated value ');
});
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
answered Nov 15 '18 at 10:14
JiteshWJiteshW
1,05331652
1,05331652
Thank you very much, it works !
– Sandip Nag
Nov 15 '18 at 10:22
add a comment |
Thank you very much, it works !
– Sandip Nag
Nov 15 '18 at 10:22
Thank you very much, it works !
– Sandip Nag
Nov 15 '18 at 10:22
Thank you very much, it works !
– Sandip Nag
Nov 15 '18 at 10:22
add a comment |
It you do a console to next line after setState has been called it
will log only previous state. I don't know why the behaviour exists. Try logging it in componentDidUpdate.
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
add a comment |
It you do a console to next line after setState has been called it
will log only previous state. I don't know why the behaviour exists. Try logging it in componentDidUpdate.
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
add a comment |
It you do a console to next line after setState has been called it
will log only previous state. I don't know why the behaviour exists. Try logging it in componentDidUpdate.
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
It you do a console to next line after setState has been called it
will log only previous state. I don't know why the behaviour exists. Try logging it in componentDidUpdate.
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
answered Nov 15 '18 at 8:26
Naveen VigneshNaveen Vignesh
309112
309112
add a comment |
add a comment |
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