React Native - Update Parent State in Child with Dynamic Key
I am very new to both Javascript and React Native, and I am trying update a parent's state by using a callback function using a dynamic key to avoid writing multiple functions.
In the parent component, I pass this function to the child to child to update the parent's state based on user text input. This code achieves the desired result.
In Parent:
_setAge = (value) => {
this.setState({age: value})}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => {this.props._setAge(input)} }
//Etc.
However, I am looking for a way to pass a desired state key from the parent to the child to update the state dynamically. I have tried the following:
In Parent:
const ageKey = 'age'
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } stateKey = ageKey } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => this.props._setAge(input, this.props.stateKey)
//Etc.
However this doesn't work. My current work around is writing 6 functions for my 6 child components, each updating the desire state. However, while this would work for my basic app, I am looking for a way that is more scalable for future projects. Thank you!
javascript react-native
asked Nov 21 '18 at 17:31
holdenmaudlin
11
add a comment |
I am very new to both Javascript and React Native, and I am trying update a parent's state by using a callback function using a dynamic key to avoid writing multiple functions.
In the parent component, I pass this function to the child to child to update the parent's state based on user text input. This code achieves the desired result.
In Parent:
_setAge = (value) => {
this.setState({age: value})}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => {this.props._setAge(input)} }
//Etc.
However, I am looking for a way to pass a desired state key from the parent to the child to update the state dynamically. I have tried the following:
In Parent:
const ageKey = 'age'
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } stateKey = ageKey } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => this.props._setAge(input, this.props.stateKey)
//Etc.
However this doesn't work. My current work around is writing 6 functions for my 6 child components, each updating the desire state. However, while this would work for my basic app, I am looking for a way that is more scalable for future projects. Thank you!
javascript react-native
asked Nov 21 '18 at 17:31
holdenmaudlin
11
I put these snipits into a sandbox pretty much as is and it seems to work, maybe I'm misunderstanding your problem? codesandbox.io/s/95v45pj7w
– SpeedOfRound
Nov 21 '18 at 17:59
Hi SpeedOfRound! Thank you, it's working now. I probably was resolved an issue I did not know about while comparing your code to mine. I appreciate the time
– holdenmaudlin
Nov 21 '18 at 19:40
add a comment |
I am very new to both Javascript and React Native, and I am trying update a parent's state by using a callback function using a dynamic key to avoid writing multiple functions.
In the parent component, I pass this function to the child to child to update the parent's state based on user text input. This code achieves the desired result.
In Parent:
_setAge = (value) => {
this.setState({age: value})}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => {this.props._setAge(input)} }
//Etc.
However, I am looking for a way to pass a desired state key from the parent to the child to update the state dynamically. I have tried the following:
In Parent:
const ageKey = 'age'
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } stateKey = ageKey } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => this.props._setAge(input, this.props.stateKey)
//Etc.
However this doesn't work. My current work around is writing 6 functions for my 6 child components, each updating the desire state. However, while this would work for my basic app, I am looking for a way that is more scalable for future projects. Thank you!
javascript react-native
asked Nov 21 '18 at 17:31
holdenmaudlin
11
I am very new to both Javascript and React Native, and I am trying update a parent's state by using a callback function using a dynamic key to avoid writing multiple functions.
In the parent component, I pass this function to the child to child to update the parent's state based on user text input. This code achieves the desired result.
In Parent:
_setAge = (value) => {
this.setState({age: value})}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => {this.props._setAge(input)} }
//Etc.
However, I am looking for a way to pass a desired state key from the parent to the child to update the state dynamically. I have tried the following:
In Parent:
const ageKey = 'age'
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = { this._setAge.bind(this) } stateKey = ageKey } />
In Child:
//Other child code
<TextInput onChangeText = { (input) => this.props._setAge(input, this.props.stateKey)
//Etc.
However this doesn't work. My current work around is writing 6 functions for my 6 child components, each updating the desire state. However, while this would work for my basic app, I am looking for a way that is more scalable for future projects. Thank you!
javascript react-native
javascript react-native
asked Nov 21 '18 at 17:31
holdenmaudlin
11
asked Nov 21 '18 at 17:31
holdenmaudlin
11
asked Nov 21 '18 at 17:31
holdenmaudlin
11
asked Nov 21 '18 at 17:31
holdenmaudlin
11
asked Nov 21 '18 at 17:31
holdenmaudlin
11
11
I put these snipits into a sandbox pretty much as is and it seems to work, maybe I'm misunderstanding your problem? codesandbox.io/s/95v45pj7w
– SpeedOfRound
Nov 21 '18 at 17:59
Hi SpeedOfRound! Thank you, it's working now. I probably was resolved an issue I did not know about while comparing your code to mine. I appreciate the time
– holdenmaudlin
Nov 21 '18 at 19:40
add a comment |
I put these snipits into a sandbox pretty much as is and it seems to work, maybe I'm misunderstanding your problem? codesandbox.io/s/95v45pj7w
– SpeedOfRound
Nov 21 '18 at 17:59
Hi SpeedOfRound! Thank you, it's working now. I probably was resolved an issue I did not know about while comparing your code to mine. I appreciate the time
– holdenmaudlin
Nov 21 '18 at 19:40
I put these snipits into a sandbox pretty much as is and it seems to work, maybe I'm misunderstanding your problem? codesandbox.io/s/95v45pj7w
– SpeedOfRound
Nov 21 '18 at 17:59
I put these snipits into a sandbox pretty much as is and it seems to work, maybe I'm misunderstanding your problem? codesandbox.io/s/95v45pj7w
– SpeedOfRound
Nov 21 '18 at 17:59
Hi SpeedOfRound! Thank you, it's working now. I probably was resolved an issue I did not know about while comparing your code to mine. I appreciate the time
– holdenmaudlin
Nov 21 '18 at 19:40
Hi SpeedOfRound! Thank you, it's working now. I probably was resolved an issue I did not know about while comparing your code to mine. I appreciate the time
– holdenmaudlin
Nov 21 '18 at 19:40
add a comment |
1 Answer
1
active
oldest
votes
In Parent
Instead of passing stateKey in props on child key directly pass the state key in onChageText method in child. the code would look like this->>>>
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = {this._setAge} /> // providing no statekey here
Inside the child
<TextInput onChangeText = { (input) => this.props._setAge(input, 'age') }
// here i know statekey for each child so i directly pass the key from child so i dont have to pass it as a props and then access it
answered Nov 21 '18 at 17:55
md.warish Ansari
772
Hi md.warish Ansari thanks for the response. Unfortunately I am trying to avoid hard coding the key in the child component because I am re-using it 6 times. I should have been more clear with my variable names. I would like to pass in the key from the parent so each time I use the child component, I can customize which state of the parent it updates.
– holdenmaudlin
Nov 21 '18 at 18:46
@holdenmaudlin I recommend putting your "magic number" into a constants file and importing it as needed
– SpeedOfRound
Nov 21 '18 at 21:08
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In Parent
Instead of passing stateKey in props on child key directly pass the state key in onChageText method in child. the code would look like this->>>>
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = {this._setAge} /> // providing no statekey here
Inside the child
<TextInput onChangeText = { (input) => this.props._setAge(input, 'age') }
// here i know statekey for each child so i directly pass the key from child so i dont have to pass it as a props and then access it
answered Nov 21 '18 at 17:55
md.warish Ansari
772
Hi md.warish Ansari thanks for the response. Unfortunately I am trying to avoid hard coding the key in the child component because I am re-using it 6 times. I should have been more clear with my variable names. I would like to pass in the key from the parent so each time I use the child component, I can customize which state of the parent it updates.
– holdenmaudlin
Nov 21 '18 at 18:46
@holdenmaudlin I recommend putting your "magic number" into a constants file and importing it as needed
– SpeedOfRound
Nov 21 '18 at 21:08
add a comment |
In Parent
Instead of passing stateKey in props on child key directly pass the state key in onChageText method in child. the code would look like this->>>>
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = {this._setAge} /> // providing no statekey here
Inside the child
<TextInput onChangeText = { (input) => this.props._setAge(input, 'age') }
// here i know statekey for each child so i directly pass the key from child so i dont have to pass it as a props and then access it
answered Nov 21 '18 at 17:55
md.warish Ansari
772
Hi md.warish Ansari thanks for the response. Unfortunately I am trying to avoid hard coding the key in the child component because I am re-using it 6 times. I should have been more clear with my variable names. I would like to pass in the key from the parent so each time I use the child component, I can customize which state of the parent it updates.
– holdenmaudlin
Nov 21 '18 at 18:46
@holdenmaudlin I recommend putting your "magic number" into a constants file and importing it as needed
– SpeedOfRound
Nov 21 '18 at 21:08
add a comment |
In Parent
Instead of passing stateKey in props on child key directly pass the state key in onChageText method in child. the code would look like this->>>>
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = {this._setAge} /> // providing no statekey here
Inside the child
<TextInput onChangeText = { (input) => this.props._setAge(input, 'age') }
// here i know statekey for each child so i directly pass the key from child so i dont have to pass it as a props and then access it
answered Nov 21 '18 at 17:55
md.warish Ansari
772
In Parent
Instead of passing stateKey in props on child key directly pass the state key in onChageText method in child. the code would look like this->>>>
_setAge = (value, stateKey) => {
this.setState({ [stateKey]: value })}
<ChildComponent name = 'Update Age' _setAge = {this._setAge} /> // providing no statekey here
Inside the child
<TextInput onChangeText = { (input) => this.props._setAge(input, 'age') }
// here i know statekey for each child so i directly pass the key from child so i dont have to pass it as a props and then access it
answered Nov 21 '18 at 17:55
md.warish Ansari
772
answered Nov 21 '18 at 17:55
md.warish Ansari
772
answered Nov 21 '18 at 17:55
md.warish Ansari
772
answered Nov 21 '18 at 17:55
md.warish Ansari
772
772
Hi md.warish Ansari thanks for the response. Unfortunately I am trying to avoid hard coding the key in the child component because I am re-using it 6 times. I should have been more clear with my variable names. I would like to pass in the key from the parent so each time I use the child component, I can customize which state of the parent it updates.
– holdenmaudlin
Nov 21 '18 at 18:46
@holdenmaudlin I recommend putting your "magic number" into a constants file and importing it as needed
– SpeedOfRound
Nov 21 '18 at 21:08
add a comment |
Hi md.warish Ansari thanks for the response. Unfortunately I am trying to avoid hard coding the key in the child component because I am re-using it 6 times. I should have been more clear with my variable names. I would like to pass in the key from the parent so each time I use the child component, I can customize which state of the parent it updates.
– holdenmaudlin
Nov 21 '18 at 18:46
@holdenmaudlin I recommend putting your "magic number" into a constants file and importing it as needed
– SpeedOfRound
Nov 21 '18 at 21:08
Hi md.warish Ansari thanks for the response. Unfortunately I am trying to avoid hard coding the key in the child component because I am re-using it 6 times. I should have been more clear with my variable names. I would like to pass in the key from the parent so each time I use the child component, I can customize which state of the parent it updates.
– holdenmaudlin
Nov 21 '18 at 18:46
Hi md.warish Ansari thanks for the response. Unfortunately I am trying to avoid hard coding the key in the child component because I am re-using it 6 times. I should have been more clear with my variable names. I would like to pass in the key from the parent so each time I use the child component, I can customize which state of the parent it updates.
– holdenmaudlin
Nov 21 '18 at 18:46
@holdenmaudlin I recommend putting your "magic number" into a constants file and importing it as needed
– SpeedOfRound
Nov 21 '18 at 21:08
@holdenmaudlin I recommend putting your "magic number" into a constants file and importing it as needed
– SpeedOfRound
Nov 21 '18 at 21:08
add a comment |
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I put these snipits into a sandbox pretty much as is and it seems to work, maybe I'm misunderstanding your problem? codesandbox.io/s/95v45pj7w
– SpeedOfRound
Nov 21 '18 at 17:59
Hi SpeedOfRound! Thank you, it's working now. I probably was resolved an issue I did not know about while comparing your code to mine. I appreciate the time
– holdenmaudlin
Nov 21 '18 at 19:40