I am trying to increase the cart size using variable "Csize" in Reactjs useEffect and useState

Farjana
March 4, 2024
97 views
1 vote
2 Answers

const [Cart, setCart] = useState([]);
const [Csize, setSize] = useState(0);

useEffect(() => {
        setSize(Cart.length);
        console.log("updated size", Csize); // Log the updated size directly
}, [Cart]);
    
const handleClick = (item) => {
        // Check if the item is already present in the cart
        const isPresent = Cart.some(cartItem => cartItem.id === item.id);
        if (isPresent) {
            return;
        }
    
        // Update Cart state by adding the new item
        setCart([...Cart, item]);
        console.log(Csize)
    }

<ul>
<Link to="/Cart" className="bikescart"><ShoppingCart color="#ffffff" size={35}/>
<span>{Csize}</span>
</Link>
</ul>

This is bikes.jsx file.

And what i am getting in console is everytime i click on add to cart the Csize remains 0.
How to fix this ?

Answers

- Shanu
- February 28, 2024 at 6:02 pm
- 0 votes
0
actually you are trying to console.log() just after you update the state,
and setState() function is asynchronous. This means you cannot see updated value of state inside the same function(where you updated the state), so if you want to see updated state of CSize just console.log outside the useEffect.

btw you can directly use length of your Cart state without using useEffect hook
```
<Link to="/Cart" className="bikescart"><ShoppingCart color="#ffffff" size={35}/>
<span>{Cart.length}</span>
</Link>
```
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