`useLocalRowIdsListener`

The useLocalRowIdsListener primitive registers a listener function with the Relationships object that will be called whenever the local Row Ids in a Relationship change.

useLocalRowIdsListener(
  relationshipId: MaybeAccessor<IdOrNull>,
  remoteRowId: MaybeAccessor<IdOrNull>,
  listener: LocalRowIdsListener,
  relationshipsOrRelationshipsId?: MaybeAccessor<undefined | RelationshipsOrRelationshipsId>,
): void

	Type	Description
`relationshipId`	`MaybeAccessor<IdOrNull>`	The `Id` of the `Relationship` to listen to, or `null` as a wildcard.
`remoteRowId`	`MaybeAccessor<IdOrNull>`	The `Id` of the remote `Row` to listen to, or `null` as a wildcard.
`listener`	`LocalRowIdsListener`	The function that will be called whenever the local `Row` `Ids` change.
`relationshipsOrRelationshipsId?`	`MaybeAccessor<undefined \| RelationshipsOrRelationshipsId>`	The `Relationships` object to register the listener with: omit for the default context `Relationships` object, provide an `Id` for a named context `Relationships` object, or provide an explicit reference.
returns	`void`	This has no return value.

This primitive is useful for situations where a component needs to register its own specific listener to do more than simply tracking the value (which is more easily done with the useLocalRowIds primitive).

You can either listen to a single local Row (by specifying the Relationship Id and local Row Id as the method's first two parameters), or changes to any local Row (by providing a null wildcards).

Both, either, or neither of the relationshipId and remoteRowId parameters can be wildcarded with null. You can listen to a specific remote Row in a specific Relationship, any remote Row in a specific Relationship, a specific remote Row in any Relationship, or any remote Row in any Relationship.

Unlike the addLocalRowsIdListener method, which returns a listener Id and requires you to remove it manually, the useLocalRowIdsListener primitive manages this lifecycle for you: when the component unmounts, the listener on the underlying Indexes object will be deleted.

Example

This example creates the TinyBase objects needed by the Solid primitive or component and calls it from within a reactive root.

import {createRoot} from 'solid-js';
import {
  createCheckpoints,
  createIndexes,
  createMetrics,
  createQueries,
  createRelationships,
  createStore,
} from 'tinybase';
import {useLocalRowIdsListener} from 'tinybase/ui-solid';

createRoot((dispose) => {
  const store = createStore()
    .setTables({
      pets: {
        fido: {species: 'dog', color: 'brown', next: 'felix'},
        felix: {species: 'cat', color: 'black'},
      },
      species: {dog: {price: 5}, cat: {price: 4}},
    })
    .setValues({open: true});
  const metrics = createMetrics(store).setMetricDefinition(
    'highestPrice',
    'species',
    'max',
    'price',
  );
  const indexes = createIndexes(store).setIndexDefinition(
    'bySpecies',
    'pets',
    'species',
  );
  const relationships = createRelationships(store)
    .setRelationshipDefinition('petSpecies', 'pets', 'species', 'species')
    .setRelationshipDefinition('nextPet', 'pets', 'pets', 'next');
  const queries = createQueries(store).setQueryDefinition(
    'petColors',
    'pets',
    ({select, where, param}) => {
      select('color');
      where((getCell) => getCell('species') == param('species'));
    },
    {species: 'dog'},
  );
  const checkpoints = createCheckpoints(store);
  store.setCell('pets', 'fido', 'color', 'walnut');
  checkpoints.setCheckpoint('updated color');
  metrics.getMetric('highestPrice');
  indexes.getSliceIds('bySpecies');
  relationships.getRemoteRowId('petSpecies', 'fido');
  queries.getResultRowIds('petColors');
  useLocalRowIdsListener(
    'petSpecies',
    'dog',
    () => undefined,
    relationships,
  );
  dispose();
});

Since

v8.3.0