移除数组中的项并将视图与React和React Redux的状态同步是一个常见的前端开发问题。为了解决这个问题,我们可以采取以下步骤:
下面是一个示例代码,演示如何在React和React Redux中移除数组中的项并同步更新视图:
// reducers.js
import { combineReducers } from 'redux';
const initialArrayState = [1, 2, 3, 4, 5]; // 初始数组状态
function arrayReducer(state = initialArrayState, action) {
switch (action.type) {
case 'REMOVE_ITEM':
return state.filter(item => item !== action.payload);
default:
return state;
}
}
const rootReducer = combineReducers({
array: arrayReducer,
});
export default rootReducer;
// actions.js
export const removeItem = item => ({
type: 'REMOVE_ITEM',
payload: item,
});
// App.js
import React from 'react';
import { connect } from 'react-redux';
import { removeItem } from './actions';
const App = ({ array, removeItem }) => {
const handleRemove = item => {
removeItem(item);
};
return (
<div>
<ul>
{array.map(item => (
<li key={item}>
{item}
<button onClick={() => handleRemove(item)}>移除</button>
</li>
))}
</ul>
</div>
);
};
const mapStateToProps = state => ({
array: state.array,
});
export default connect(mapStateToProps, { removeItem })(App);
// index.js
import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import { createStore } from 'redux';
import rootReducer from './reducers';
import App from './App';
const store = createStore(rootReducer);
ReactDOM.render(
<Provider store={store}>
<App />
</Provider>,
document.getElementById('root')
);
这样,当点击移除按钮时,对应的数组项会被从数组中移除,并且视图会自动更新以反映这个变化。
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