[英]Change a property of a component from another component and render it in the html in angular 2
[英]Render component after change in another component
在我的应用程序中,我正在添加新产品。 但在我第二次点击后,它出现在列表中。 在 AddProducts 中,我 console.log 更改了列表的数组并且它已经更新。 但是在 mu ProductList 中,单击添加后它不起作用,所以我应用 componentDidUpdate 来对更改做出反应。 此外,我在 App 中使用 useEffect 对从 AddProduct 发送的更改做出反应,但它仅在我第二次单击时才有效。
添加产品
function AddProducts(props) {
const [newProduct, setNewProduct] = useState({
productName: ``,
category: ``,
groceries: false,
});
const [newList, setNewList] = useState(props.productsToDisplay);
function handleChange(event) {
event.preventDefault();
setNewProduct({
...newProduct,
[event.target.name]:
event.target.type === "checkbox"
? event.target.checked
: event.target.value,
});
}
function handleAddNewProduct() {
const addProduct = newList.concat([
{
nazwa: newProduct.productName,
kategoria: newProduct.category,
produktSpozywczy: newProduct.groceries,
},
]);
setNewList(addProduct);
props.sendNewProductsToParent(newList);
}
return (
<div className={styles.Wrapper}>
{console.log(newList)}
<p>Add products</p>
<input
name="productName"
value={newProduct.productName}
onChange={handleChange}
></input>
<input
name="category"
value={newProduct.category}
onChange={handleChange}
></input>
<input
name="groceries"
type="checkbox"
value={newProduct.groceries}
onChange={handleChange}
></input>
<p>Is it groceries?</p>
<button onClick={handleAddNewProduct}>Add new product</button>
</div>
);
}
产品列表
class ProductsList extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<div className={commonColumnsStyles.App}>
{console.log(this.props.productsToDisplay)}
<header className={commonColumnsStyles.AppHeader}>
<p>Products list</p>
<ul>
{this.props.productsToDisplay.map((currProduct, index) => (
<li key={index} onClick={() => this.addProduct(index)}>
{currProduct.nazwa}
</li>
))}
</ul>
</header>
</div>
);
}
}
function App() {
const [resultToDisplay, setResultToDisplay] = useState(``);
const [newProductsList, setNewProductsList] = useState(produkty);
return (
<div className={styles.appWrapper}>
{console.log(newProductsList)}
<AddProducts
productsToDisplay={produkty}
sendNewProductsToParent={setNewProductsList}
/>
<div className={styles.columnsWrapper}>
<ProductsList
productsToDisplay={newProductsList}
sendAddedProductsToParent={setResultToDisplay}
/>
</div>
</div>
);
}
社区解决方案: AddProduct
function AddProducts(props) {
const [newProduct, setNewProduct] = useState({
productName: ``,
category: ``,
groceries: false,
});
function handleChange(event) {
event.preventDefault();
setNewProduct({
...newProduct,
[event.target.name]:
event.target.type === "checkbox"
? event.target.checked
: event.target.value,
});
}
function handleAddNewProduct() {
const addProduct = {
nazwa: newProduct.productName,
kategoria: newProduct.category,
produktSpozywczy: newProduct.groceries,
};
props.sendNewProductToParent((listOfPrimiaryProducts) => [
...listOfPrimiaryProducts,
addProduct,
]);
}
return (
<div className={styles.Wrapper}>
<p>Add products</p>
<input
name="productName"
value={newProduct.productName}
onChange={handleChange}
></input>
<input
name="category"
value={newProduct.category}
onChange={handleChange}
></input>
<input
name="groceries"
type="checkbox"
value={newProduct.groceries}
onChange={handleChange}
></input>
<p>Is it groceries?</p>
<button onClick={handleAddNewProduct}>Add new product</button>
</div>
);
}
export default AddProducts;
产品列表
class ProductsList extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<div className={commonColumnsStyles.App}>
<header className={commonColumnsStyles.AppHeader}>
<p>Products list</p>
<ul>
{this.props.productsInShop.map((currProduct, index) => (
<li key={index} onClick={() => this.addProduct(index)}>
{currProduct.nazwa}
</li>
))}
</ul>
</header>
</div>
);
}
}
export default ProductsList;
应用程序
function App() {
const [productsList, setProductsList] = useState(produkty);
return (
<div className={styles.appWrapper}>
<AddProducts sendNewProductToParent={setProductsList} />
<div className={styles.columnsWrapper}>
<ProductsList
productsInShop={productsList}
/>
</div>
</div>
);
}
export default App;
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