我目前正在寻找一种从父组件访问子state
的方法,该组件将处理整个页面的API调用。
实际问题如下:
Parent
是将呈现两个Child
组件的父组件。
每个Child
都有一个由它负责的州。
“提交按钮类型”将具有“一种提交行动”(这是全部引用,因为这不是表格)并且应该触发该功能以提供对子状态的访问。有没有办法(一些React功能)不使用<form>
或没有创建中间父组件来保持所有状态?我希望每个孩子都对自己的国家负责。
Code Sandbox with example of the code below
import React, { useState, useRef } from "react";
function ChildOne() {
const [childOneState, setChildOneState] = useState(false);
return (
<React.Fragment>
<h3>Child One</h3>
<p>My state is: {childOneState.toString()}</p>
<button onClick={() => setChildOneState(true)}>Change my state</button>
</React.Fragment>
);
}
function ChildTwo() {
const [childTwoState, setChildTwoState] = useState(false);
return (
<React.Fragment>
<h3>Child Two</h3>
<p>My state is: {childTwoState.toString()}</p>
<button onClick={() => setChildTwoState(true)}>Change my state</button>
</React.Fragment>
);
}
function Button(props) {
return (
<button onClick={props.kindOfSubmitAction}>Kind of Submit Button</button>
);
}
function Parent() {
const childOneState = useRef("i have no idea");
const childTwoState = useRef("ihave no idea");
function kindOfSubmitAction() {
console.log("This is the kindOfSubmit function!");
// This function would somehow get
// access to the children state and store them into the refs
return;
}
return (
<React.Fragment>
<h1>Iam Parent</h1>
<div>
<b>Child one state is: </b>
{childOneState.current}
</div>
<div>
<b>Child two state is: </b>
{childTwoState.current}{" "}
</div>
<Button kindOfSubmitAction={kindOfSubmitAction} />
<ChildOne />
<ChildTwo />
</React.Fragment>
);
}
export default Parent;
当几个组件需要访问相同的数据时,是时候Lifting State Up了。