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I’d like to store my app’s state in localStorage. Is there a callback or an event that fires on state change? I would use it to call localStorage.state = JSON.stringify(this.state). Possibly, using 0.5 seconds throttling.
TodoMVC React examples uses localStorage as a storage. However, it defines saving and removing in event handlers such as keydown and click. For my case, doing the same would create a lot of boilerplate.
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In react, first load data from localstorage / database and initialize the state. Then update the state in the code as you want. Then listen on state changes to do any task ( In this case save to localstorage )
You can initialize your state by getting the value of local storage. useState hook accept a function as a parameter. Now, when your component would render, it will get the value that is on local storage and assign to your state. But, it would be easier if you would use React Context to manage global values .
Answer: B is the correct option. In ES6, there are three ways of defining your variables: var, let, and const. 14) What is a state in React? A permanent storage.
In a componentDidUpdate lifecycle method you could serialize the state:
componentDidUpdate: function(prevProps, prevState) {
localStorage.state = JSON.stringify(this.state);
}
That code will be run each time the component rerenders (which happens with every props or state change).
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