[英]On firing action in redux, it says action isn't defined
我是redux的新手,并在redux中列出了待办事项。 我的动作创建者代码如下:
/**
* This file is called Action Creator (creates actions)
*
* Actions are objects as :
* {
* type : 'ADD_TODO' //the only thing needed is type
* text: 'this is our first to do'
* }
*/
module.exports = {
addTodo: function (text) {
return (dispatch) => {
dispatch({type: 'ADD_TODO', data: text});
};
}
};
//export default actions = {
// addTodo(text) {
// return {
// type: 'ADD_TODO',
// text: text
// }
// }
//};
//
我不是从动作中返回对象,而是返回一个函数。 因此,在store.js文件中,我使用了react-redux
thunkMiddleware
。
我的store.js代码如下所示:
import { applyMiddleware, compose, createStore } from 'redux';
import reducer from '../reducers/reducers';
import thunkMiddleware from 'redux-thunk';
//We separated out the store from the client.js file so that if we have to add middleware here and change our state, we can do that here
//Add middlewares on actions here
let finalCreateStore = compose(
applyMiddleware(thunkMiddleware)
)(createStore);
export default function configureStore(initialState = {todos: []}) {
return finalCreateStore(reducer, initialState);
}
但是在触发动作时,它表示动作未定义
[编辑]
我的Reducer看起来像这样:
function getId(state) {
return state.todos.reduce((maxId, todo) => {
return Math.max(todo.id, maxId)
}, -1) + 1;
}
export default function reducer(state, actions) {
switch (actions.type) {
case 'ADD_TODO':
Object.assign({}, state, {
todos: [{
//add new to do
text: action.text,
completed: false,
id: getId(state)
}, ...state.todos]
});
break;
default:
return state;
}
}
另外,我使用connect
作为触发动作:
function mapStateToProps(state) {
return state;
}
function mapDispatchToProps(dispatch) {
return {
addTodo: (todo) => {
dispatch(addTodo(todo));
}
}
}
export default connect(mapStateToProps, mapDispatchToProps)(App);
我不知道如何摆脱这个错误。
你的化简签名是(state, actions)
但是在功能体中你有action
。 您可能的意思是:
function reducer (state, action) {
// code
}
减速器中有错别字。 您将actions
定义为第二个参数,但是您尝试从未定义的action
读取一行(我在此处添加了注释)。
export default function reducer(state, actions) {
switch (actions.type) {
case 'ADD_TODO':
Object.assign({}, state, {
todos: [{
//add new to do
text: action.text, // <- action is not defined, but actions is
completed: false,
id: getId(state)
}, ...state.todos]
});
break;
default:
return state;
}
}
这也可能是高兴叫它action
,而不是actions
,因为它只是一个单一的动作。
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