我正在使用React和Redux做电话列表,并且有问题 . 应该期待的是:用户以模态形式放置他的数据,当他点击提交按钮时 - onClick函数触发器和数据调度到Redux商店,然后从商店转到localStorage,其中将存储所有数据 .
问题:不是创建包含存储中包含数据的对象的数组,而是创建了空数组 . 下次单击“提交”按钮后 - 第一次单击“放入”而不是空数组的数据 . 等等 .
和普通的React setState有同样的问题 .
代码:
应用程序:
import React from "react";
import { Input } from "../components/Input";
import { Table } from "../components/Table";
import { ButtonAdd } from "../components/ButtonAdd";
import { connect } from "react-redux";
import { setInput, setUser, setFormModalStatus, setSuccessModalStatus} from
"../actions/dataActions";
class App extends React.Component {
constructor(props) {
super(props);
this.handleSubmit = this.handleSubmit.bind(this);
this.openFormModal = this.openFormModal.bind(this);
this.closeFormModal = this.closeFormModal.bind(this);
this.openSuccessModal = this.openSuccessModal.bind(this);
this.closeSuccessModal = this.closeSuccessModal.bind(this);
}
openFormModal() {
this.props.setFormModalStatus(true);
}
closeFormModal() {
this.props.setFormModalStatus(false);
}
openSuccessModal() {
this.props.setSuccessModalStatus(true);
}
closeSuccessModal() {
this.props.setSuccessModalStatus(false);
}
handleSubmit(e) {
this.closeFormModal();
this.openSuccessModal(); //this is for modals
const datas = this.props.form.input.values //{name: 'Rick', tel: 12345}
this.props.setUser(datas); //making dispatch with data
console.log(this.props.data.users); // [] - the issue
const testData = {name: Josh, tel: 54321};
this.props.setUser(testData);
console.log(this.props.data.users); //[{name: 'Rick, tel: 12345}]
e.preventDefault();
this.props.form.input.values = '';
}
render() {
return (
<div className="container">
<div className="row">
<div className="col-xs-12 col-md-10 col-md-offset-1">
<div className="box">
<Input input={this.props.input}/>
<ButtonAdd
formModalStatus=
{this.props.data.formModalStatus}
successModalStatus=
{this.props.data.successModalStatus}
openFormModal={this.openFormModal}
closeFormModal={this.closeFormModal}
closeSuccessModal={this.closeSuccessModal}
handleSubmit={this.handleSubmit}
/>
</div>
<Table />
</div>
</div>
</div>
);
}
}
const mapStateToProps = (state) => {
return {
data: state.data,
form: state.form
};
};
const mapDispatchToProps = (dispatch) => {
return {
setInput: (input) => {
dispatch(setInput(input));
},
setUser: (user) => {
dispatch(setUser(user));
},
setFormModalStatus: (boolean) => {
dispatch(setFormModalStatus(boolean));
},
setSuccessModalStatus: (boolean) => {
dispatch(setSuccessModalStatus(boolean));
}
};
};
export default connect(mapStateToProps, mapDispatchToProps)(App);
减速器:
const dataReducer = (state = {
input: "",
users: [],
formModalStatus: false,
successModalStatus: false
}, action) => {
switch (action.type) {
case "SET_INPUT":
state = {
...state,
input: action.payload
};
break;
case "SET_USER":
state = {
...state,
users: [...state.users, action.payload]
};
break;
case "SET_FORM_MODAL_STATUS":
state = {
...state,
formModalStatus: action.payload
}
case "SET_SUCCESS_MODAL_STATUS":
state = {
...state,
successModalStatus: action.payload
}
}
return state;
};
export default dataReducer;
适用行动:
export function setUser(user) {
return {
type: "SET_USER",
payload: user
};
}
2 回答
你永远不应该直接在React或Redux中改变状态 . 使用Redux,您希望始终返回一个新对象来替换以前的状态 .
也许尝试这样的事情呢?
如果你可以在WebpackBin上提供一个工作样本,那么这将有助于更好地调试问题 .
根据我的经验,这通常发生在州发生变异时 . 您可以尝试在reducer上使用以下格式:
现有功能正在改变现有状态
state=...
PS:此外,您在减速机的最后两个操作案例中缺少
break
语句 . 而你的default
案件