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useResultCellIds

The useResultCellIds hook returns the Ids of every Cell in a given Row in the ResultTable of the given query, and registers a listener so that any changes to those Ids will cause a re-render.

useResultCellIds(
  queryId: Id,
  rowId: Id,
  queriesOrQueriesId?: any,
): Ids
TypeDescription
queryIdId

The Id of the query.

rowIdId

The Id of the Row in the ResultTable.

queriesOrQueriesId?any

The Queries object to be accessed: omit for the default context Queries object, provide an Id for a named context Queries object, or provide an explicit reference.

returnsIds

An array of the Ids of every Cell in the Row in the result of the query.

A Provider component is used to wrap part of an application in a context, and it can contain a default Queries object or a set of Queries objects named by Id. The useResultCellIds hook lets you indicate which Queries object to get data for: omit the final optional final parameter for the default context Queries object, provide an Id for a named context Queries object, or provide a Queries object explicitly by reference.

When first rendered, this hook will create a listener so that changes to the result Cell Ids will cause a re-render. When the component containing this hook is unmounted, the listener will be automatically removed.

Examples

This example creates a Queries object outside the application, which is used in the useResultCellIds hook by reference. A change to the data in the query re-renders the component.

const store = createStore().setTable('pets', {
  fido: {species: 'dog', color: 'brown'},
  felix: {species: 'cat', color: 'black'},
  cujo: {species: 'dog', color: 'black'},
});
const queries = createQueries(store).setQueryDefinition(
  'dogColors',
  'pets',
  ({select, where}) => {
    select('species');
    select('color');
    select('legs');
    where('species', 'dog');
  },
);
const App = () => (
  <span>
    {JSON.stringify(useResultCellIds('dogColors', 'fido', queries))}
  </span>
);

const app = document.createElement('div');
ReactDOMClient.createRoot(app).render(<App />);
console.log(app.innerHTML);
// -> '<span>["species","color"]</span>'

store.setCell('pets', 'fido', 'legs', 4);
console.log(app.innerHTML);
// -> '<span>["species","color","legs"]</span>'

This example creates a Provider context into which a default Queries object is provided. A component within it then uses the useResultCellIds hook.

const App = ({queries}) => (
  <Provider queries={queries}>
    <Pane />
  </Provider>
);
const Pane = () => (
  <span>{JSON.stringify(useResultCellIds('dogColors', 'fido'))}</span>
);

const queries = createQueries(
  createStore().setTable('pets', {
    fido: {species: 'dog', color: 'brown'},
    felix: {species: 'cat', color: 'black'},
    cujo: {species: 'dog', color: 'black'},
  }),
).setQueryDefinition('dogColors', 'pets', ({select, where}) => {
  select('species');
  select('color');
  where('species', 'dog');
});
const app = document.createElement('div');
ReactDOMClient.createRoot(app).render(<App queries={queries} />);
console.log(app.innerHTML);
// -> '<span>["species","color"]</span>'

This example creates a Provider context into which a Queries object is provided, named by Id. A component within it then uses the useResultCellIds hook.

const App = ({queries}) => (
  <Provider queriesById={{petQueries: queries}}>
    <Pane />
  </Provider>
);
const Pane = () => (
  <span>
    {JSON.stringify(useResultCellIds('dogColors', 'fido', 'petQueries'))}
  </span>
);

const queries = createQueries(
  createStore().setTable('pets', {
    fido: {species: 'dog', color: 'brown'},
    felix: {species: 'cat', color: 'black'},
    cujo: {species: 'dog', color: 'black'},
  }),
).setQueryDefinition('dogColors', 'pets', ({select, where}) => {
  select('species');
  select('color');
  where('species', 'dog');
});
const app = document.createElement('div');
ReactDOMClient.createRoot(app).render(<App queries={queries} />);
console.log(app.innerHTML);
// -> '<span>["species","color"]</span>'

Since

v2.0.0