[英]Change text value on button click
我是 REACT JS 的新手,所以在制作应用程序时,我被困在这部分,我想在单击按钮时更改 h1 值
import Button from 'react-bootstrap/Button';
import './App.css';
import { Container } from 'react-bootstrap';
import { Row } from 'react-bootstrap';
function App() {
return (
<Container>
<Row className="Row">
<div className="frame">
<h1>this text should change</h1>
<Button className=" btn btn1" color="light">YES</Button> // this button should change the text
<Button className=" btn btn2" color="light">NO</Button>
</div>
</Row>
</Container>
);
}
export default App;
永远不要访问真实的 DOM。 使用状态并将其呈现为 React 方式。
我通常会使用 state 来改变一些东西 - 请参阅Using the State Hook 。 然后渲染出来。 创建这个:
const [Text, setText] = useState("this text should change");
渲染它:
<h1>{Text}</h1>
使用事件处理程序并使用type="button"
这样它就不会刷新页面:
<Button
className=" btn btn1"
color="light"
type="button"
onClick={() => {
setText("Praveen is awesome! You clicked on YES button!");
}}
>
YES
</Button>
{/*// this button should change the text*/}
<Button
className=" btn btn2"
color="light"
type="button"
onClick={() => {
setText("Praveen is awesome! You clicked on NO button!");
}}
>
NO
</Button>
现在看看魔术: https://557w4.csb.app/
代码:
import Button from "react-bootstrap/Button";
import "./App.css";
import { Container } from "react-bootstrap";
import { Row } from "react-bootstrap";
import { useState } from "react";
function App() {
const [Text, setText] = useState("this text should change");
return (
<Container>
<Row className="Row">
<div className="frame">
<h1>{Text}</h1>
<Button
className=" btn btn1"
color="light"
type="button"
onClick={() => {
setText("Praveen is awesome! You clicked on YES button!");
}}
>
YES
</Button>
{/*// this button should change the text*/}
<Button
className=" btn btn2"
color="light"
type="button"
onClick={() => {
setText("Praveen is awesome! You clicked on NO button!");
}}
>
NO
</Button>
</div>
</Row>
</Container>
);
}
export default App;
预习
完整代码沙盒: https://codesandbox.io/s/broken-snow-557w4?file=/src/App.js
在这种情况下,您必须使用钩子state
(文档)。
所以,首先你必须导入 useState 钩子,然后创建它并最后使用它。
因此,您的代码将是这样的:
import Button from 'react-bootstrap/Button';
import './App.css';
import { Container } from 'react-bootstrap';
import { Row } from 'react-bootstrap';
import { useState } from 'react';
function App() {
const [text, setText] = useState("this text should change");
return (
<Container>
<Row className="Row">
<div className="frame">
<h1>{text}</h1>
<Button className=" btn btn1" color="light" onClick={e => setText("new text")}>YES</Button> // this button should change the text
<Button className=" btn btn2" color="light">NO</Button>
</div>
</Row>
</Container>
);
}
export default App;
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