[英]How to listen redux state changes in react hooks?
我有多个 forms 和用户现在可以编辑的按钮,如果 redux 的 state 发生变化,我想显示一个按钮保存。
现场演示: state 变化时显示按钮保存
这是我的 redux。
const initialState = {
firstName: "Kunta ",
lastName: "Kinte",
age: 35,
country: "Ghana",
color: "#000"
};
const DetailsReducer = (state = initialState, action) => {
const { name, value } = action;
return { ...state, [name]: value };
};
export default DetailsReducer;
这是我的 js 代码,如果 redux state 发生变化,则显示保存按钮
import React, { useState, useEffect } from "react";
import { useSelector, useDispatch } from "react-redux";
const Settings = () => {
const fields = useSelector((state) => state);
const dispatch = useDispatch();
const [saveBtn, setSaveBtn] = useState(false);
useEffect(() => {
setSaveBtn(true); // show save btn if there is changes in state
}, []);
console.log(fields.firstName);
return (
<div>
<div>
<h1>Edit </h1>
First Name:{" "}
<input
name="firstname"
value={fields.firstName}
onChange={(e) =>
dispatch({ name: "firstName", value: e.target.value, type: "" })
}
/>
{saveBtn === true && <button className="btn-save">save </button>}
</div>
</div>
);
};
export default Settings;
[1]: https://codesandbox.io/s/multiple-inputs-kkm6l?file=/src/Components/Settings.js:0-816
我需要做什么来解决这个问题。?
你可以尝试这样的事情:
<input
name="firstname"
value={fields.firstName}
onChange={(e) =>
dispatch({ name: "firstName", value: e.target.value, type: "" }, setSaveBtn(true))
}
/>
同时还删除:
useEffect(() => {
setSaveBtn(true); // show save btn if there is changes in state
}, []);
你可以这样做。 移除效果挂钩,将 setSaveBtn 移至输入 onChange,点击保存后,只需将 setSaveBtn 设置为 false。
import React, { useState, useEffect } from "react";
import { useSelector, useDispatch } from "react-redux";
const Settings = () => {
const fields = useSelector((state) => state);
const dispatch = useDispatch();
const [saveBtn, setSaveBtn] = useState(false);
console.log(fields.firstName);
return (
<div>
<div>
<h1>Edit </h1>
First Name:{" "}
<input
name="firstname"
value={fields.firstName}
onChange={(e) => {
dispatch({ name: "firstName", value: e.target.value, type: "" })
setSaveBtn(true)
}}
/>
{saveBtn === true &&
<button
onClick={() => setSaveBtn(false)}
className="btn-save">save </button>}
</div>
</div>
);
};
export default Settings;
你试过这个吗?
const fields = useSelector((state) => state.WHATEVER_REDUCER);
useEffect(() => {
setSaveBtn(true); // show save btn if there is changes in state
}, [fields]);
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