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useRowIdsListener

The useRowIdsListener hook registers a listener function with a Store that will be called whenever the Row Ids in a Table change.

useRowIdsListener(
  tableId: IdOrNull,
  listener: RowIdsListener,
  listenerDeps?: DependencyList,
  mutator?: boolean,
  storeOrStoreId?: StoreOrStoreId,
): void
TypeDescription
tableIdIdOrNull

The Id of the Table to listen to, or null as a wildcard.

listenerRowIdsListener

The function that will be called whenever the Row Ids in the Table change.

listenerDeps?DependencyList

An optional array of dependencies for the listener function, which, if any change, result in the re-registration of the listener. This parameter defaults to an empty array.

mutator?boolean

An optional boolean that indicates that the listener mutates Store data.

storeOrStoreId?StoreOrStoreId

The Store to register the listener with: omit for the default context Store, provide an Id for a named context Store, or provide an explicit reference.

returnsvoid

This has no return value.

This hook 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 useRowIds hook).

You can either listen to a single Table (by specifying its Id as the method's first parameter) or changes to any Table (by providing null).

Unlike the addRowIdsListener method, which returns a listener Id and requires you to remove it manually, the useRowIdsListener hook manages this lifecycle for you: when the listener changes (per its listenerDeps dependencies) or the component unmounts, the listener on the underlying Store will be deleted.

Example

This example uses the useRowIdsListener hook to create a listener that is scoped to a single component. When the component is unmounted, the listener is removed from the Store.

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

const App = ({store}) => (
  <Provider store={store}>
    <Pane />
  </Provider>
);
const Pane = () => {
  useRowIdsListener('pets', () => console.log('Row Ids changed'));
  return <span>App</span>;
};

const store = createStore().setTables({pets: {fido: {color: 'brown'}}});
const app = document.createElement('div');
const root = createRoot(app);
root.render(<App store={store} />);
console.log(store.getListenerStats().rowIds);
// -> 1

store.setRow('pets', 'felix', {color: 'black'});
// -> 'Row Ids changed'

root.unmount();
console.log(store.getListenerStats().rowIds);
// -> 0

Since

v1.0.0