react event typescript
handleChange(e: React.ChangeEvent<HTMLInputElement>) {
// No longer need to cast to any - hooray for react!
this.setState({temperature: e.target.value});
}
render() {
...
<input value={temperature} onChange={this.handleChange} />
...
);
}handler for button in react typescript
const handleAddToCart = (clickedItem: CartItemType) => {
setCartItems(prev => {
// 1. Is the item already added in the cart?
const isItemInCart = prev.find(item => item.id === clickedItem.id);
if (isItemInCart) {
return prev.map(item =>
item.id === clickedItem.id
? { ...item, amount: item.amount + 1 }
: item
);
}
// First time the item is added
return [...prev, { ...clickedItem, amount: 1 }];
});
};Copyright © 2021 Codeinu
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