Forked from jimode/context-and-localstorage-using-hooks.js
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May 18, 2022 06:10
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Providing Context and Local Storage Using Hooks
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// Providing Context | |
// ================== | |
import React, {useState, useEffect} from "react" | |
const Context = React.createContext() | |
function ContextProvider({children}) { | |
const [allPhotos, setAllPhotos] = useState([]) | |
const [cartItems, setCartItems] = useState([]) | |
// Local Storage: setting & getting data | |
useEffect(() => { | |
const cartItemsData = JSON.parse(localStorage.getItem('cartItems')) | |
if (cartItemsData) { | |
setCartItems(cartItemsData) | |
} | |
}, []) | |
useEffect(() => { | |
localStorage.setItem('cartItems', JSON.stringify(cartItems)) | |
}, [cartItems]) | |
const url = "https://raw.githubusercontent.com/bobziroll/scrimba-react-bootcamp-images/master/images.json" | |
useEffect(() => { | |
fetch(url) | |
.then(res => res.json()) | |
.then(data => setAllPhotos(data)) | |
}, []) | |
function toggleFavorite(id) { | |
const updatedArr = allPhotos.map(photo => { | |
if(photo.id === id) { | |
return {...photo, isFavorite: !photo.isFavorite} | |
} | |
return photo | |
}) | |
setAllPhotos(updatedArr) | |
} | |
function addToCart(newItem) { | |
setCartItems(prevItems => [...prevItems, newItem]) | |
} | |
function removeFromCart(id) { | |
setCartItems(prevItems => prevItems.filter(item => item.id !== id)) | |
} | |
return ( | |
<Context.Provider value={{allPhotos, toggleFavorite, cartItems, addToCart, removeFromCart}}> | |
{children} | |
</Context.Provider> | |
) | |
} | |
export {ContextProvider, Context} | |
// Retrieving state using useContext | |
// ================================= | |
import React, {useState, useContext} from "react" | |
import PropTypes from "prop-types" | |
import {Context} from "../Context" | |
function Image({className, img}) { | |
const [hovered, setHovered] = useState(false) | |
const {toggleFavorite, addToCart, cartItems, removeFromCart} = useContext(Context) | |
function heartIcon() { | |
if(img.isFavorite) { | |
return <i className="ri-heart-fill favorite" onClick={() => toggleFavorite(img.id)}></i> | |
} else if(hovered) { | |
return <i className="ri-heart-line favorite" onClick={() => toggleFavorite(img.id)}></i> | |
} | |
} | |
function cartIcon() { | |
const alreadyInCart = cartItems.some(item => item.id === img.id) | |
if(alreadyInCart) { | |
return <i className="ri-shopping-cart-fill cart" onClick={() => removeFromCart(img.id)}></i> | |
} else if(hovered) { | |
return <i className="ri-add-circle-line cart" onClick={() => addToCart(img)}></i> | |
} | |
} | |
return ( | |
<div | |
className={`${className} image-container`} | |
onMouseEnter={() => setHovered(true)} | |
onMouseLeave={() => setHovered(false)} | |
> | |
<img src={img.url} className="image-grid"/> | |
{heartIcon()} | |
{cartIcon()} | |
</div> | |
) | |
} | |
Image.propTypes = { | |
className: PropTypes.string, | |
img: PropTypes.shape({ | |
id: PropTypes.string.isRequired, | |
url: PropTypes.string.isRequired, | |
isFavorite: PropTypes.bool | |
}) | |
} | |
export default Image |
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