如何在 React 中的排序方法上触发渲染（带有过滤器和分页）？

Question

这是我的 Sort.js 样式组件：

<SortWrapper>
    <SortText>Sort By</SortText>
    <SortSelect onChange={onSelectChange}>
      <SortOption value="vehicleMake">Vehicle make</SortOption>
      <SortOption value="vehicleModel">Vehicle model</SortOption>
    </SortSelect>
  </SortWrapper>

这是 App.js 中的函数，其中渲染排序组件

<Sort onSelectChange={onSelectChange} />

这是一个函数：

const onSelectChange = (e) => {
const value = e.target.value;

if (value === "VehicleMake")
  vehicles.sort((a, b) => a.vehicleMake.localeCompare(b.vehicleMake));
else if (value === "VehicleModel") {
  vehicles.sort((a, b) => a.vehicleModel.localeCompare(b.vehicleModel));
} else {
  vehicles.sort((a, b) => a.id - b.id);
}

“车辆”是我从 Firestore 数据库获取的对象数组。

每当我更改 SortOption 的值时，它都不会自动对对象数组进行排序，但当我单击分页中的第 2 页，然后单击第 1 页时，它会对其进行排序。

这是我的网格组件：

<Grid>
      {vehiclesData.map((vehicle) => (
        <VehicleCard
          id={vehicle.id}
          key={vehicle.id}
          ImageURL={vehicle.ImageURL}
          vehicleMake={vehicle.vehicleMake}
          vehicleModel={vehicle.vehicleModel}
          selectVehicle={() => setSelectedVehicle(vehicle)}
          deleteHandler={() => deleteHandler(vehicle.id)}
        />
      ))}
    </Grid>

这是我的过滤功能：

const vehiclesData = useMemo(() => {
let computedVehicles = vehicles;

if (searchVehicle) {
  computedVehicles = computedVehicles.filter((vehicle) =>
    vehicle.vehicleMake.toLowerCase().includes(searchVehicle.toLowerCase())
  );
}

setTotalVehicles(computedVehicles.length);

return computedVehicles.slice(
  (currentPage - 1) * vehiclesPerPage,
  (currentPage - 1) * vehiclesPerPage + vehiclesPerPage
);

正如我之前所写，我希望我的车辆按品牌或型号自动渲染，而不是在我单击分页中的页码时渲染。

Answer 1

你的排序方法应该是这样的

const onSelectChange = (e) => {
let temVehicles = [...vehicles]
const value = e.target.value;

if (value === "VehicleMake")
  temVehicles .sort((a, b) => a.vehicleMake.localeCompare(b.vehicleMake));
else if (value === "VehicleModel") {
  temVehicles .sort((a, b) => a.vehicleModel.localeCompare(b.vehicleModel));
} else {
  temVehicles .sort((a, b) => a.id - b.id);
}
setVehicles(temVehicles )}

你的过滤函数应该是这样的

const vehiclesData = useMemo(() => {
let computedVehicles = vehicles;

if (searchVehicle) {
  computedVehicles = computedVehicles.filter((vehicle) =>
    vehicle.vehicleMake.toLowerCase().includes(searchVehicle.toLowerCase())
  );
}

setTotalVehicles(computedVehicles.length);

return computedVehicles.slice(
  (currentPage - 1) * vehiclesPerPage,
  (currentPage - 1) * vehiclesPerPage + vehiclesPerPage
);},[vehicles])

基本上，一旦 onSelectChange 运行，您就会更新车辆状态，然后 usememo 应该再次运行，因此我们向其中添加依赖车辆