嘿,伙计们,我有一个表单在我的react redux项目,所以在提交表单时,我调用一个动作,点击post api插入文档到mongodb,所以我也希望是每次更新的状态,所以,只要我提交的形式,我的状态得到更新,然后我渲染他们以下(作为对象数组)。
表格.js
class Form extends Component {
constructor(props) {
super(props);
this.state = {
taskName: "",
taskDescription: "",
};
}
handleSubmit = () => {
this.props.addTask(this.state);
};
render() {
return (
<div className="m-4">
<div className="d-flex justify-content-between align-items-center">
{" "}
<h2 className=" ">Pomodoro Tasks</h2>
<button className="btn btn-primary" onClick={()=>window.location.reload()}>Refresh</button>
</div>
<form>
<div className="form-group ">
<label>Task Name</label>
<input
type="text"
className="form-control"
onChange={(e) => this.setState({ taskName: e.target.value })}
/>
</div>
<div className="form-group">
<label>Task Description</label>
<input
type="text"
className="form-control"
onChange={(e) => this.setState({ taskDescription: e.target.value })}
/>
</div>
</form>
<button type="submit" className="btn btn-primary" onClick={(e) => this.handleSubmit(e)}>
Submit
</button>
////render here the state
</div>
);
}
}
const mapStateToProps = (state) => {
return state
};
export default connect(mapStateToProps, { addTask })(Form);
Actions.js
export const addTask = (details) => {
return async (dispatch ,getState) =>{
axios.post('/add_task', details)
.then(function (response) {
Swal.fire('Tasks Added !')
dispatch({type:POSTDATA,payload:response.data})
})
.catch(function (error) {
Swal.fire('Error in adding to database')
console.log(error);
});
};
};
export const getTask = () => {
return async (dispatch ,getState) =>{
axios.get('/get_task')
.then(function (response) {
dispatch({type:GETDATA,payload:response.data})
})
.catch(function (error) {
console.log(error);
});
};
};
reducer.js
const postPomodoro = (state = [], action) => {
switch (action.type) {
case POSTDATA:
return action.payload; //well this is only returning one object that is inserted at that time i need to
somehow get all the previous data too that are inserted in order to update state with all data and then render it.
default:
return state;
}
};
const getPomodoro = (state = [], action) => {
switch (action.type) {
case GETDATA:
return {...state,tasks:action.payload};
default:
return state;
}
};
我在reducer中试了一下
case POSTDATA:
return {...state,task:action.payload};
但这也给了我最近的数据,被插入,而不是所有的数据,以前插入的
你需要合并状态中的数据,而不是覆盖它。在你的reducer中使用一个spread语法来实现这个功能,比如下面的内容
const postPomodoro = (state = [], action) => {
switch (action.type) {
case POSTDATA:
return [...state, action.payload];
default:
return state;
}
};
一旦你在reducer中更新了状态,你就可以在组件中使用connect和mapStateToProps来访问它。
const Comp = (props) => {
// iterate over props.postTask and render
}
const mapStateProps = (state) => {
return {
postTask: state.postPomodoro
}
}
export default connect(mapStateToProps)(Comp)