在redux-saga应用中实现加载指示器的最佳方式是通过创建一个Saga来处理加载指示器的逻辑。以下是一个示例:
loadingIndicatorSaga
。在该Saga中,我们可以使用takeEvery
或takeLatest
等effect来监听需要显示或隐藏加载指示器的action。import { takeEvery, put } from 'redux-saga/effects';
import { showLoadingIndicator, hideLoadingIndicator } from './actions';
function* showLoadingIndicatorSaga() {
yield put(showLoadingIndicator());
}
function* hideLoadingIndicatorSaga() {
yield put(hideLoadingIndicator());
}
function* loadingIndicatorSaga() {
yield takeEvery('START_LOADING', showLoadingIndicatorSaga);
yield takeEvery('STOP_LOADING', hideLoadingIndicatorSaga);
}
export default loadingIndicatorSaga;
loadingIndicatorSaga
添加到rootSaga中。import { all } from 'redux-saga/effects';
import loadingIndicatorSaga from './loadingIndicatorSaga';
function* rootSaga() {
yield all([
// 其他的sagas
loadingIndicatorSaga(),
]);
}
export default rootSaga;
// actions.js
export const showLoadingIndicator = () => ({
type: 'SHOW_LOADING_INDICATOR',
});
export const hideLoadingIndicator = () => ({
type: 'HIDE_LOADING_INDICATOR',
});
// reducer.js
const initialState = {
isLoading: false,
};
const loadingIndicatorReducer = (state = initialState, action) => {
switch (action.type) {
case 'SHOW_LOADING_INDICATOR':
return {
...state,
isLoading: true,
};
case 'HIDE_LOADING_INDICATOR':
return {
...state,
isLoading: false,
};
default:
return state;
}
};
export default loadingIndicatorReducer;
connect
函数将加载指示器状态和相关的action绑定到组件的props上。import React from 'react';
import { connect } from 'react-redux';
import { startLoading, stopLoading } from './actions';
const MyComponent = ({ isLoading, startLoading, stopLoading }) => {
// 根据isLoading状态显示或隐藏加载指示器
return (
<div>
{isLoading && <div>Loading...</div>}
<button onClick={startLoading}>Start Loading</button>
<button onClick={stopLoading}>Stop Loading</button>
</div>
);
};
const mapStateToProps = (state) => ({
isLoading: state.loadingIndicator.isLoading,
});
const mapDispatchToProps = {
startLoading,
stopLoading,
};
export default connect(mapStateToProps, mapDispatchToProps)(MyComponent);
这样,当点击"Start Loading"按钮时,会触发startLoading
action,从而显示加载指示器;当点击"Stop Loading"按钮时,会触发stopLoading
action,从而隐藏加载指示器。
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