useRef and UseState together!
$ npm i react-usestaterefimport useState from 'react-usestateref'
function MyComponent(){
var [state,setState,ref]=useState(0)
// ref.current will always have the latest state
}As you can see it's 100% backward compatible. You can replace all your useState with this import and you will always have the latest state.
Many StackOverflow questions that people struggling to get the current state
- https://stackoverflow.com/questions/54069253/usestate-set-method-not-reflecting-change-immediately
- https://stackoverflow.com/questions/60438537/usestate-shows-previous-value-always
- https://stackoverflow.com/questions/57847594/react-hooks-accessing-up-to-date-state-from-within-a-callback
- https://stackoverflow.com/questions/55874789/using-react-hooks-why-are-my-event-handlers-firing-with-the-incorrect-state
In React when functions accessing the state they receive the state from the moment the function defined - not the current state.
So if the state changed, your functions and effects my use older state.
Using useRef, can solve it because it have always one value. But when you update the Ref it's not re-render.
See the example code:
function MyComponent(){
var [counter,setCounter]=useState(0)
function increment(){
setCounter(counter+1)
alert(counter) // will show 0 since the state not updated yet.
}
useEffect(()=>{
alert(counter) // Whatever is the current state. It always alert 0
return ()=>{
alert(counter) // On unmount it still alert 0, even if you called increment many times.
}
},[])
return (
<div>
Current number: {counter}
<button onClick={increment}>
Increment
</button>
</div>)
}To solve it I created a new hook useStateRef
See it in action:
import useState from 'react-usestateref' // see this line
function MyComponent(){
var [counter,setCounter,counterRef]=useState(0)
function increment(){
setCounter(counter+1)
alert(counterRef.current) // will show 1
}
useEffect(()=>{
alert(counterRef.current) // Always show the last value
return ()=>{
alert(counterRef.current) // // Always show the last value
}
},[])
return (
<div>
Current number: {counter}
<button onClick={increment}>
Increment
</button>
</div>)
}It's fully support the useState API, so you can change your useState to useStateRef and it will not break your app.
- Star & fork this project.
- I'm open to your contribution.
- Better documentation or whatever your like. Just open a PR