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useResultRowIds

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

useResultRowIds(
  queryId: string,
  queriesOrQueriesId?: QueriesOrQueriesId,
): Ids
TypeDescription
queryIdstring

The Id of the query.

queriesOrQueriesId?QueriesOrQueriesId

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. See the addResultRowIdsListener method for more details.

returnsIds

An array of the Ids of every 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 useResultRowIds 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 Row 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 useResultRowIds hook by reference. A change to the data in the query re-renders the component.

import React from 'react';
import {createRoot} from 'react-dom/client';
import {createQueries, createStore} from 'tinybase';
import {useResultRowIds} from 'tinybase/ui-react';

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('color');
    where('species', 'dog');
  },
);
const App = () => (
  <span>{JSON.stringify(useResultRowIds('dogColors', queries))}</span>
);

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

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

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

import React from 'react';
import {createRoot} from 'react-dom/client';
import {createQueries, createStore} from 'tinybase';
import {Provider, useResultRowIds} from 'tinybase/ui-react';

const App = ({queries}) => (
  <Provider queries={queries}>
    <Pane />
  </Provider>
);
const Pane = () => (
  <span>{JSON.stringify(useResultRowIds('dogColors'))}</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('color');
  where('species', 'dog');
});
const app = document.createElement('div');
createRoot(app).render(<App queries={queries} />);
console.log(app.innerHTML);
// -> '<span>["fido","cujo"]</span>'

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

import React from 'react';
import {createRoot} from 'react-dom/client';
import {createQueries, createStore} from 'tinybase';
import {Provider, useResultRowIds} from 'tinybase/ui-react';

const App = ({queries}) => (
  <Provider queriesById={{petQueries: queries}}>
    <Pane />
  </Provider>
);
const Pane = () => (
  <span>{JSON.stringify(useResultRowIds('dogColors', '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('color');
  where('species', 'dog');
});
const app = document.createElement('div');
createRoot(app).render(<App queries={queries} />);
console.log(app.innerHTML);
// -> '<span>["fido","cujo"]</span>'

Since

v2.0.0