[英]React-Redux, how to change state?
我有这样的问题:我正在制作待办事项列表,现在我想为我的任务制作 EditMode。 但是当我尝试这样做时,它返回字符串而不是数组,这就是为什么我有 3 个错误(map,some,filter = is not a function)。 所以我不知道如何更改状态(任务)并返回更改后的数组。
一些细节:我正在使用连接来获取道具。
组件代码
class Item extends React.Component {
state = {
statusChange: false,
task: ''
}
activeStatusChange = () => {
this.setState( {
statusChange: true
}
);
}
deActivateStatusChange = () => {
this.setState( {
statusChange: false
}
);
this.props.editTask(this.state.task)
}
onStatusChange = (e) => {
this.setState({
task: e.currentTarget.value
})
}
render(){
return (
<div className={s.item}>
<span onClick={this.props.editStatus} className={s.statusTask}>
{this.props.status ? <img src="https://img.icons8.com/doodle/48/000000/checkmark.png"/>
: <img src="https://img.icons8.com/emoji/48/000000/red-circle-emoji.png"/>}
</span>
{ this.state.statusChange
? <input onChange={this.onStatusChange} autoFocus={true} onBlur={this.deActivateStatusChange} value={this.state.task} />
: <span className={this.props.status === true ? s.task : s.taskFalse} onClick={this.activeStatusChange}> {this.props.task} </span>}
<span onClick={this.props.deleteTask} className={s.close}><img src="https://img.icons8.com/color/48/000000/close-window.png"/></span>
</div>
)
}
}
export default Item;
减速机代码
import React from 'react'
import shortid from 'shortid';
const ADD_TASK = 'ADD_TASK'
const EDIT_STATUS = 'EDIT_STATUS'
const TASK_DELETE = 'TASK_DELETE'
const REMOVE_ALL_DONE = 'REMOVE_ALL_DONE'
const REMOVE_ALL_TASKS = 'REMOVE_ALL_TASKS'
const EDIT_TASK = 'EDIT_TASK'
const initialState = {
tasks: []
};
const mainReducer = (state = initialState, action) => {
switch (action.type) {
case ADD_TASK: {
return {
...state,
tasks: [{
id: shortid.generate(),
task: action.task,
status: false
}, ...state.tasks]
}
}
case EDIT_STATUS: {
return {
...state,
tasks: state.tasks.map(task => task.id === action.id ? {...task, status: !task.status} : task)
}
}
case TASK_DELETE: {
return {
...state,
tasks: state.tasks.filter(t => t.id !== action.id)
}
}
case REMOVE_ALL_DONE: {
return {
...state,
tasks: state.tasks.filter(t => !t.status)
}
}
case REMOVE_ALL_TASKS: {
return {
...state,
tasks: []
}
}
case EDIT_TASK: {
return {
...state,
tasks: action.task
}
}
default:
return state
}
}
export const addTask = task => ({type: 'ADD_TASK', task});
export const editStatus = id => ({type: 'EDIT_STATUS', id})
export const deleteTask = id => ({type: 'TASK_DELETE', id})
export const removeAllDone = () => ({type:'REMOVE_ALL_DONE'})
export const removeAllTasks = () => ({type: 'REMOVE_ALL_TASKS'})
export const editTask = task => ({type: 'EDIT_TASK', task})
export default mainReducer;
您应该创建一个使用方法 mapDispatchToProps 的容器,以便您可以在组件中使用您的操作。
https://react-redux.js.org/using-react-redux/connect-mapdispatch
所以让我们去做吧。 只需创建一个文件作为该组件的容器,然后输入如下代码:
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import Item from 'wherever your component is';
import { addTask } from 'wherever your action is';
const mapStateToProps = ({ }) => ({
// Here you can pass the redu state to your component
});
const mapDispatchToProps = (dispatch) => ({
...bindActionCreators({
// Here you pass the action to your component
addTask
}, dispatch)
});
export default connect(
mapStateToProps,
mapDispatchToProps,
)(Item);
然后,当您想使用 Item 组件时,将其从容器中导入,它将在 props 中接收您从容器文件传递的操作和 state。
在您的 Item 组件中,您可以使用如下操作:
// ITem component
render() {
return (
<button onClick={this.props.addTask} />
)
}
如果有任何疑问,请告诉我!
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