useState Hook React Example

WinMaw answered on August 31, 2022 Popularity 8/10 Helpfulness 2/10

answer useState Hook React Example

related How to use React useState Hook

useState Hook React Example

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//this example is for adding user to list

import React, { useState } from 'react';

const [users,setUsers] = useState([
{id:1,name:"John Doe"},{id:2,name:"Merry"},
]);

const [name,setName] = useState('');
const [password,setPassword] = useState('');



function onSubmitHandler(e){
	e.preventDefault();
	console.log(name,password);
	const newUser = {id:Date.now(), name, password}

	setUsers([...users,newUser]);
    
}

return(
<div classsName="container">
	<form onSubmit={onSubmitHandler}>
     <input value={name} onChange={ (e) => setName(e.target.value) } />
     <input value={password} onChange={ (e) => setPassword(e.target.value) } />

     <button type="submit">Create</button>
     </form>
     
    <ul>
    	{users.map(user,index) => {
        	return (
            	<li key={user.id}>{user.name}</li>
            )
        }}
    </ul>

</div>

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: hook javascript use-state

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Contributed on May 07 2023

WinMaw

0 Answers Avg Quality 2/10

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How to use React useState Hook

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useState - Has the main purpose to change an element status
useState basically helps React to know what to elements need to be rerendered. 

Ex: We have a post                 (state: it is displayed) 
    You want to eliminate the post (setState: it is not displayed)

Code Ex.:
const [blogs, setBlogs] = useState([  
    { title: 'React forever', body:'Lorem ipsum...', author: 'Sara', id: 1 },
    { title: 'Vue kinda sucks', body:'Lorem ipsum...', author: 'Tony', id: 2 },
    { title: 'Angular lets not go there', body:'Lorem ipsum...', author: 'John', id: 3 },
  	]);

// The JS function that filters all the post with diff. id from the id of the post clicked
const handleDelete = (id) => {
  const newBlogs = blogs.filter(blog => blog.id !== id);
    setBlogs(newBlogs);
  }

// React renders the following JSX
return (
    <div className="blog-list">
      <h2>{ title }</h2>
        {blogs.map((blog) => (
          <div className="blog-preview" key={blog.id}>
            <h3>{ blog.title }</h3>
            <p>written by { blog.author }</p>
            <p>{ blog.body }</p> 
            <button onClick={() => handleDelete(blog.id)} className="hideBtn">Hide Post</button>
          </div>
        ))}
    </div>
    );

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: hook

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Contributed on Aug 31 2022

Gabriele Orlandi

0 Answers Avg Quality 2/10

useState Hook React Example

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