使用反应+钩子,我如何调用/使用“navigate()”异步 redux 正确分派后?
当在“dispatch(saveItem(item))”上使用“await”时,它不应该有任何效果,
同时,如果我不使用“等待”,这两个函数将同时运行,从而生成保存的项目,但不会重新渲染组件。
尽管 redux 存储中的状态发生变化,但视图却没有变化, 当使用await时,实际上是等待调度完成,然后运行导航。
我的主要问题是如何在 redux 调度后正确导航?
import { useEffect, useRef, useState } from 'react';
import { useDispatch } from 'react-redux';
import { useNavigate, useParams } from 'react-router-dom';
import { useForm } from '../hooks/useForm';
import { getById } from '../services/itemService';
import { saveItem } from '../store/actions/itemActions';
export function ItemEdit() {
const dispatch = useDispatch();
const navigate = useNavigate();
const [item, handleChange, setItem] = useForm(null);
const itemId = useParams().id;
useEffect(async () => {
await loadItem();
}, []);
const loadItem = async () => {
try {
const item = await getById(itemId)
setItem(item);
} catch(err) {
setErrMsg(err.name + ': ' + err.message);
}
};
const onSaveItem = async (ev) => {
ev.preventDefault();
await dispatch(saveItem(item));
navigate('/item')
}
return (
<form onSubmit={onSaveItem}>
<button>Save</button>
</form>
);
}
When using "await" on "dispatch(saveItem(item))" it's not supposed to have any effct ,
meanwhile if i don't use the "await" both functions will run in the same time resulting a saved item but not a component rerender.
Although the state changes in the redux store the view doesn't,
whilst using the await actually waits for the dispatch to complete and then runs the navigation.
My main question is how to properly navigate after a redux dispatch?
import { useEffect, useRef, useState } from 'react';
import { useDispatch } from 'react-redux';
import { useNavigate, useParams } from 'react-router-dom';
import { useForm } from '../hooks/useForm';
import { getById } from '../services/itemService';
import { saveItem } from '../store/actions/itemActions';
export function ItemEdit() {
const dispatch = useDispatch();
const navigate = useNavigate();
const [item, handleChange, setItem] = useForm(null);
const itemId = useParams().id;
useEffect(async () => {
await loadItem();
}, []);
const loadItem = async () => {
try {
const item = await getById(itemId)
setItem(item);
} catch(err) {
setErrMsg(err.name + ': ' + err.message);
}
};
const onSaveItem = async (ev) => {
ev.preventDefault();
await dispatch(saveItem(item));
navigate('/item')
}
return (
<form onSubmit={onSaveItem}>
<button>Save</button>
</form>
);
}
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你可以这样尝试:
它对我有用。
You can try it this way:
It works for me.