CODEWITHSUNDEEP
reactjs
john9
john9

Reputation: 33

How to detect a variable change in React js/Solidity?

I have a number variable in my react project that changes every couple of minutes.

I would like to make a popup on the screen that displays whether or not the number increased or decreased.

I'm having trouble figuring out a way to make a function that is always running and can detect when that number variable changes.

Upvotes: 1

Views: 19135

Answers (1)

Kirubel Eneyew
Kirubel Eneyew

Reputation: 116

If you are using functional components you can use the useEffect hook, like this

useEffect(()=>{
    //call your increment function here
},[someVariable]) //and in the array tag the state you want to watch for

the useEffect will cause a re-render when the state of 'someVariable' in the above example changes

you can see more about the hook in the react docs https://reactjs.org/docs/hooks-effect.html,

Upvotes: 7

Related Questions