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# Redux example
# Overview
The following example implements the @handsontable/react component with a readOnly toggle switch and the Redux state manager.
# Example
import React, { useRef } from 'react';
import ReactDOM from 'react-dom';
import { createStore } from 'redux';
import { Provider, useSelector, useDispatch } from 'react-redux';
import { HotTable } from '@handsontable/react';
import { registerAllModules } from 'handsontable/registry';
import { createSpreadsheetData } from './helpers';
// register Handsontable's modules
registerAllModules();
const App = () => {
const hotSettings = useSelector(state => state);
const dispatch = useDispatch();
const hotTableComponent = useRef(null);
const hotData = hotSettings.data;
const isHotData = Array.isArray(hotData);
const onBeforeHotChange = changes => {
dispatch({
type: 'updateData',
dataChanges: changes
});
return false;
}
const toggleReadOnly = event => {
dispatch({
type: 'updateReadOnly',
readOnly: event.target.checked
});
}
return (
<div className="redux-example-container">
<div id="example-container">
<div id="example-preview">
<div id="toggle-boxes">
<br/>
<input onClick={toggleReadOnly} id="readOnlyCheck" type="checkbox"/>
<label htmlFor="readOnlyCheck">
Toggle <code>readOnly</code> for the entire table
</label>
</div>
<br/>
<HotTable
ref={hotTableComponent}
beforeChange={onBeforeHotChange}
settings={hotSettings}
/>
</div>
<div id="redux-preview" className="table-container">
<h3>Redux store dump</h3>
{isHotData && (
<div>
<strong>data:</strong>
<table style={{ border: '1px solid #d6d6d6' }}>
<tbody>
{hotData.map((row, i) => (
<tr key={i}>
{row.map((cell, i) => <td key={i}>{cell}</td>)}
</tr>
))}
</tbody>
</table>
</div>
)}
<table>
<tbody>
{Object.entries(hotSettings).map(([name, value]) => name !== 'data' && (
<tr key={`${name}${value}`}>
<td><strong>{name}:</strong></td>
<td>{value.toString()}</td>
</tr>
))}
</tbody>
</table>
</div>
</div>
</div>
);
};
const initialReduxStoreState = {
data: createSpreadsheetData(5, 3),
colHeaders: true,
rowHeaders: true,
readOnly: false,
height: 'auto',
licenseKey: 'non-commercial-and-evaluation'
};
const updatesReducer = (state = initialReduxStoreState, action) => {
switch (action.type) {
case 'updateData':
const newData = [...state.data];
action.dataChanges.forEach(([row, column, oldValue, newValue]) => {
newData[row][column] = newValue;
})
return {
...state,
data: newData
}
case 'updateReadOnly':
return {
...state,
readOnly: action.readOnly
};
default:
return state;
}
};
const reduxStore = createStore(updatesReducer);
ReactDOM.render(
<Provider store={reduxStore}>
<App/>
</Provider>,
document.getElementById('example1')
);