在 ag 网格回调中使用状态变量不更新

Question

我query在函数内部使用状态变量isExternalFilterPresent永远不会更新。我感到困惑，因为第一次console.log的query与查询的每个变化更新。我想这是因为我不太了解钩子的实现。

let gridApi: GridApi | null = null;

const HouseholdTable = ({accountsData, aggregateEntityTable: {aggregateEntity, columnDefs}}: OwnProps & StateProps) => {

  const [isDeepDiveOpen, setIsDeepDiveOpen] = useState(false);
  const [query, setQuery] = useState('');

  useEffect(() => {
    gridApi && gridApi.onFilterChanged();
  }, [query]);

  if (accountsData) {

    const onGridReady = ({api}: GridReadyEvent) => {
      api.sizeColumnsToFit();
      gridApi = api;
    };

    const aggData = accountsData.aggregations[aggregateEntity];

    console.log(query); // This updates when query changes
    const isExternalFilterPresent = (): boolean => {
      console.log(query); // This never updates
      return !!query; 
    };

    const doesExternalFilterPass = (rowNode: RowNode): boolean => {
      // console.log('doesExternalFilterPass');
      return true;
    };

    return (
      <>
        <HouseholdsToolbar aggData={aggData}
          isDeepDiveOpen={isDeepDiveOpen}
          onDeepDiveToggleClick={setIsDeepDiveOpen}
          onQueryChange={setQuery}
        />
        <AgGridReact rowData={[]}
          columnDefs={[]}
          gridOptions={{
            headerHeight: 70,
            suppressFieldDotNotation: true,
            suppressHorizontalScroll: false,
            onGridReady,
            isExternalFilterPresent,
            doesExternalFilterPass
          }}
        />
      </>
    );
  } else {
    // handle loading
    return (<div>loading</div>);
  }
};

const mapStateToProps = (state: StoreState): StateProps => {
  const {faStore: {accountsData}} = state;
  return {
    accountsData,
    aggregateEntityTable: aggregateEntityTableDummyConfig
  };
};

export default connect(mapStateToProps)(HouseholdTable);

export const aggregateEntityTableDummyConfig: AggregateEntityTable = {
  aggregateEntity: 'FOO',
  columnDefs: []
};

编辑：更新了整个组件。

Answer 1

钩子不是问题。看起来在第一次渲染时AgGridReact存储对您传递给的函数的引用isExternalFilterPresent，然后在重新渲染时永远不会更改此引用。更清楚地说，AgGridReact存储第一个“版本”isExternalFilterPresent并且从不更新它。要解决您的问题，您需要将过滤器的值存储在useRef钩子中。

反应文档说：

useRef() 钩子不仅仅用于 DOM 引用。“ref”对象是一个通用容器，其当前属性是可变的并且可以保存任何值，类似于类上的实例属性。

因此，您可能会将 useRef 视为类中的属性。

在这里你必须做的：

const query = useRef(null);

const setQuery = (value) => {
  query.current = value;
  gridApi && gridApi.onFilterChanged();
}

const isExternalFilterPresent = (): boolean => {
  console.log(query.current); // Now it changes
  return !!query.current; 
};

这里有一个关于代码和框的例子