如何按组件顺序调用传奇?

Question

problem

我想在按下increase_number and decrease_number按钮时呼叫func()，但我不知道该怎么做。

我能做到吗？(它增加一个数字，然后减少。

还是我必须创建一个新的动作和传奇？

感谢您的阅读！

源代码

重复(与传奇(

import { createAction, handleActions } from 'redux-actions';
import { delay } from 'redux-saga';
import { all, put, select, takeEvery } from 'redux-saga/effects';
export const action_creators = {
increase_number: createAction('increase_number'),
decrease_number: createAction('decrease_number'),
set_number_success: createAction('set_number_success')
};
const state = {
number: 0
}
function* increase_number () {
const state = yield select((state) => state);
yield delay(1000);
yield put(action_creators.set_number_success({ number:++state.number }));
}
function* decrease_number() {
const state = yield select((state) => state);
yield put(action_creators.set_number_success({ number:--state.number }));
}
export function* saga() {
yield all([
takeEvery('increase_number', increase_number),
takeEvery('decrease_number', decrease_number)
]);
}
export default handleActions({
set_number_success: (state, action) => {
const new_number = action.payload.number;
console.log(new_number);
return { ...state, number:new_number };
}
}, state);

元件

import * as React from 'react';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import { put, take } from 'redux-saga/effects';
import { action_creators } from './redux';
function* func () {
yield put(action_creators.increase_number());
yield take(action_creators.set_number_success());
yield put(action_creators.decrease_number());
}
class App extends React.PureComponent {
render() {
return [
<div>{this.props.number}</div>,
<button type="button" onClick={() => this.props.increase_number()}>increase_number</button>,
<button type="button" onClick={() => this.props.decrease_number()}>decrease_number</button>,
<button type="button">increase_number and decrease_number</button> <= Here.
]
}
}
function map_state_to_props(state) {
return {
number: state.number
}
}
function map_dispatch_to_props(dispatch) {
return bindActionCreators({
increase_number: action_creators.increase_number,
decrease_number: action_creators.decrease_number
}, dispatch);
}
export default connect(map_state_to_props, map_dispatch_to_props)(App);

用于测试的网址

Answer 1

首先，你的func应该在传奇中而不是在组件中，因为它是一个传奇。

其次，是的，您需要一个单独的操作，因为它是一个单独的副作用，它结合了其他 2 个副作用，但仍然如此。

您可以通过添加另一个takeEvery()来实现最简单的方法：

...
function* increase_and_decrease() {
yield call(increase);
yield call(decrease);
}

export function* saga() {
yield all([
takeEvery('increase_number', increase_number),
takeEvery('decrease_number', decrease_number),
takeEvery('incerase_and_decrease', increase_and_decrease);
]);
}

剩下的就是将组件中的新操作拉入mapDispatchToProps并调用按钮单击。