[英]Change State of an image based on index of array - React.js
我有一些带有 svg 的卡片,需要根据点击单独(向上和向下)更改状态。 模态由引导程序处理。 所以,我试图根据数组的索引更改 svg(硬编码)的 state。 但是,即使我得到了 id(动态的),每次我点击 svg 箭头时,所有 svg 都在改变状态。
我认为 state 不应在 for 循环中更改,我想知道问题是否来自 {this.state.arrowShown && }。 那么,如何只改变被点击的卡片的svg state,而不改变其他人的state呢?
import Container from 'react-bootstrap/Container'
import Card from 'react-bootstrap/Card'
import Row from 'react-bootstrap/Row'
import Col from 'react-bootstrap/Col'
import { withTranslation } from 'react-i18next';
import Accordion from 'react-bootstrap/Accordion'
import Button from 'react-bootstrap/Button'
class ProjectCard extends React.Component {
constructor() {
super();
this.state = {
arrowShown: true,
arrowHidden: false,
}
this.handleClick = this.handleClick.bind(this);
}
handleClick(event, index) {
const id = event.currentTarget.id;
const projectArr = this.props.projects;
console.log("this.props.porjects", this.props.projects)
for (var i = 0; i < projectArr.length; i++) {
console.log("projectArr[i].idP1", projectArr[i].idP2)
if (projectArr[i].idP2 === id) {
console.log("same same")
this.setState({
arrowShown: !this.state.arrowShown,
arrowHidden: !this.state.arrowHidden
})
// newState[projectArr[i].idP2.arrowShown] = projectArr[i].idP2 === projectArr[i].idP2
}
}
// // this.setState(newState)
// }
}
render() {
const { t } = this.props;
// arrowHidden = {}
return (
<React.Fragment>
<Container fluid className=" pb-5" id="Projects">
<Row className="d-flex justify-content-center py-5" xs={1} md={1} lg={3}>
{this.props.projects.map((project, index) => (
<Col className="d-flex justify-content-center px-5 py-5" key=
{project.keyP}>
<Card className="bg-warning" border="light" >
<Card.Img variant="top" src={project.srcP}
className="overlay" />
<Card.Body className="bg-light">
<Card.Title className="text-warning" >
t(project.titleP)}</Card.Title>
<Card.Text>
{t(project.descriptionP)}
</Card.Text>
<Accordion>
<Accordion.Toggle as={Button} variant="link"
eventKey="0" className="p-0" id={project.idP1} >
<Card.Title className="text-warning" >
Features
{this.state.arrowShown
<svg id={project.idP2} onClick={(event) => { this.handleClick(event, index) }} width="1em" height="1em" viewBox="0 0 16 16" className=" down bi bi-chevron-double-down" fill="currentColor" xmlns="http://www.w3.org/2000/svg" >
<path fillRule="evenodd" d="M1.646 6.646a.5.5 0 0 1 .708 0L8 12.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z" />
<path fillRule="evenodd" d="M1.646 2.646a.5.5 0 0 1 .708 0L8 8.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z" />
</svg>
}
{this.state.arrowHidden &&
<svg id={project.idP3} onClick={(event) => { this.handleClick(event, index) }} width="1em" height="1em" viewBox="0 0 16 16" className=" up bi bi-chevron-double-up" fill="currentColor" xmlns="http://www.w3.org/2000/svg" >
<path fillRule="evenodd" d="M7.646 2.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1-.708.708L8 3.707 2.354 9.354a.5.5 0 1 1-.708-.708l6-6z" />
<path fillRule="evenodd" d="M7.646 6.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1-.708.708L8 7.707l-5.646 5.647a.5.5 0 0 1-.708-.708l6-6z" />
</svg>
}
</Card.Title>
</Accordion.Toggle> ```
ps: it is my first question so every feedback is welcome! Thank you for your support.
[enter image description here][1]
[1]: https://i.stack.imgur.com/0YD01.png
您正在为此处的每张图片更改 state
this.setState({
arrowShown: !this.state.arrowShown,
arrowHidden: !this.state.arrowHidden
})
并显示具有相同 state 值的每张图像。 这就是为什么每次翻转一个图像时所有图像都会被翻转的原因。
你可以做的是维护一个 state 这样的东西
this.state = {
[index1] : { arrowShown : true , arrowHidden :false } ,
[index2] : { arrowShown : true , arrowHidden :false } ,
//and so on
}
然后每当基于点击图像的索引你只更新 state 像这样的特定索引......
this.setState({[indexOfTheClickedImage ] : {
arrowShown: !this.state.[indexOfTheClickedImage].arrowShown ,
arrowHidden: !this.state.[indexOfTheClickedImage].arrowHidden
}}
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