Question

**这是购物车的进口和状态

const Cart = ({ cart, setActiveTab, removeFromCart, updateQuantity }) => {
const [selectedRows , setSelectedRows] = useState([]);
const [toggleCleared, setToggleCleared] = useState(false);
const [products, setProducts] = useState(cart.products) }    


 const columns = [
    {
      name: 'Product Name',
      selector: 'name',
      sortable: true,
    },
    {
      name: 'Product Price',
      selector: 'price',
      sortable: true,
      right: true,
    },
    {
        name: 'Product Quantity',
        selector: 'quantity',
        sortable: true,
        right: true,
        cell: row => <Fragment><input type="number" className="form-control" value={row.quantity} onChange = {(e)=>updateQuantity( row.id,strong text e.target.value)}/></Fragment>
      },
      {
        name: 'Subtotal',
        selector: 'quantity',
        sortable: true,
        right: true,
        cell: row => <Fragment>{row.quantity * row.price}</Fragment>
      },
      {
        name: 'Actions',
        selector: 'quantity',
        sortable: true,
        right: true,
        cell: row => <Fragment><i className="fa fa-trash" aria-hidden="true" onClick = {(e)=>removeFromCart(row.id)}></i></Fragment>
      },
  ];
  const contextActions = useMemo(() => {
    const handleDelete = () => {


        selectedRows.forEach(item=>{
            console.log(item, 'item')
            removeFromCart(products, products.indexOf(item))
        });

        setProducts(products);
        setToggleCleared(!toggleCleared);
        console.log('handleDelete', products)
    };

    return <i className="fa fa-trash" key="delete" onClick={handleDelete} style={{ backgroundColor: 'red' }} ></i>;
  });

此代码在我们选择行时设置选定的行

function rowSelection (rows) =>{
  setSelectedRows(rows.selectedRows);
}



  return (     <DataTable
                        title="Cart Products"
                        columns={columns}
                        data={products}
                        selectableRows
                        onSelectedRowsChange={rowSelection}
                        clearSelectedRows={toggleCleared}
                        contextActions={contextActions} />

）

**这是我的购物车组件，可以正常工作，但是当redux状态更改时它不会自动更新。.我可以在控制台中看到redux状态，它可以完美地更改，但数据表不会重新显示

Answer 1

const [products，setProducts] = useState（cart.products）}仅适用于初始渲染（称为初始状态）。渲染完成后，useState将不会调用。因此只需将 cart.products 传递到数据表

function rowSelection (rows) =>{
  setSelectedRows(rows.selectedRows);
}



  return (     <DataTable
                        title="Cart Products"
                        columns={columns}
                        data={cart.products}  
                        selectableRows 
                        onSelectedRowsChange={rowSelection}
                        clearSelectedRows={toggleCleared}
                        contextActions={contextActions} /> )

Redux状态更改不会重新呈现数据表

1 个答案: