react useState hook variable value don't update on input onChange event

react hooks
useeffect
react, ( usestate multiple values)
react, ( usestate array)
react hooks usestate object
react, ( usestate callback)
react usecontext hook
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react useState hook won't update on input onChange event using react functional component

const [email, setEmail] = useState("");
// i'm not able to set input value in useeffect using this code
<GridItem xs={12} sm={12} md={4}>
  <CustomInput
    labelText="Email address"
    id="email-address"
    formControlProps={{
      fullWidth: true
    }}

    value={email}
    onChange={evt => setEmail(evt.target.value)}
  />
</GridItem>

App.js

function App() {
  const [email, setEmail] = React.useState("");
  const handleChange = e => {
    setEmail(e.target.value);
  };
  return (
    <div>
      <h4>{email}</h4>
      <CustomInput handleChange={handleChange} />
    </div>
  );
}

CustomInput.js

import React from "react";

function CustomInput(props) {
  return (
    <div>
      <input type="text" onChange={props.handleChange} />
    </div>
  );
}

export default CustomInput;

The Wise Guide to React useState() Hook, React useState() hook manages the state of functional components. useState() is called at the first line of Bulbs function (don't think about hook's Let's use array destructuring to extract the state value into a variable on :. react useState hook variable value don't update on input onChange event. Ask Question Asked 1 month ago. Active 1 month ago. Viewed 90 times 0. react useState hook


Where is your function?

onChange={e => this.setEmail(e)} // use arrow function to bind this

setEmail = (e) => {
  yourSetFunction({[e.target.name]:e.target.value}) // assuming you give you input a name
}

4 Examples of the useState Hook, Here's how the React useState hook works and how to use it We'll also see a couple ways of storing multiple values. setHidden] = useState(true); // If the text is short enough, don't bother with the // buttons Each call creates a new piece of state and a setter for that state, and we store those in variables. Call useState () hook to enable state in a functional component. The first argument of the useState (initialValue) is the state’s initial value. [state, setState] = useState (initialValue) returns an array of 2 items: the state value and a state updater function.


const [email, setEmail] = useState(null);
const handleChange = (e) => {
  setEmail(e.target.value);
}
// i'm not able to set input value in useeffect using this code
<GridItem xs={12} sm={12} md={4}>
  <CustomInput
    labelText="Email address"
    id="email-address"
    formControlProps={{
      fullWidth: true
    }}

    value={email}
    onChange={handleChange}
  />
</GridItem>

react useState hook variable value don't update on input onChange , App.js function App() { const [email, setEmail] = React.useState(""); const handleChange = e => { setEmail(e.target.value); }; return ( <div>  The useState hook lets you add state to function components. By calling React.useState inside a function component, you create a single piece of state associated with that component. (every hook starts with the word “use”; a call to useState literally lets you “use state” in a function component)


A guide to useState in React, See how the useState Hook allows for state variables in functional components. The initial value will be assigned only on the initial render (if it's a function, it will be executed only Don't use useState in a class component: The useState Hook allows you to declare only one state variable (of any type) at a time, like this: import React, { useState } from 'react'; const Message= => { const messageState = useState( '' ); const listState = useState( [] ); } useState takes the initial value of the state variable as an argument.


Fetching Data and Updating State with Hooks, In React, a functional component does not have the same built-in lifecycle methods that classes do. They also don't have their own state, so you can't call this. The useState hook returns the state value and a function for updating that state: It declares a state variable called books and initializes it with an  I create a functional component and in this component, I am using the useState hook, the second useState([data,updateData]) hook contains an array of objects and I am displaying all items in the component.


How to store a function with the useState hook in React, With state hooks, functions don't seem to bite the same way other values do. If you're familiar with the useState hook in React, you know how to initialise But what happens when the value you want to store isn't the typical number or Often it works equally well to compute the next state from the variable  React State Hook. Ah, state. A cornerstone of the React ecosystem. Let's get our feet wet with Hooks by introducing the most common hook that you will be working with - useState(). Let's take a look at a class component that has state.