[英]Warning: Each child in a list should have a unique "key" prop. Even after setting the key already
[英]Each child in a list should have a unique “key” prop. Even though i am giving a key and its a unique one
我知道這個問題已經被問了很多,我完全理解 key 對重新渲染正確組件的重要性,但我給了一個 key 並做所有正確的事情,但由於某種原因它仍然給我這個警告。
付款包.component.jsx
import React from "react";
import { Row, Col } from "react-bootstrap";
import PaymentList from "../payment-list/payment-list.component";
const PaymentPackages = ({ packages }) => {
const orgSize = useSelector((state) => state.registeredUser.orgSize);
//Recommended payment plans objects to show
// Other packages plans
let plan1, plan2;
const otherPlans = packages.filter(
({ priceInfo }) => priceInfo.description !== orgSize.toLowerCase()
);
if (recommendedHeading.toLowerCase() === "small organization") {
plan1 = "medium organization";
plan2 = "large organization";
} else if (recommendedHeading.toLowerCase() === "medium organization") {
plan1 = "small organization";
plan2 = "large organization";
} else if (recommendedHeading.toLowerCase() === "large organization") {
plan1 = "small organization";
plan2 = "medium organization";
}
const paymentPlan1 = otherPlans.filter(
({ priceInfo }) => priceInfo.description === plan1
);
return (
<>
<div className="price-plan" data-test="price-plan">
<Row>
<Col>
<div className="payment-box left-box">
{paymentPlan1.map(({ priceInfo, id }, i) => (
<>
<PaymentList
key={id} // I have tried giving 'i' also and tried creating random strings as unique id but none of them is working
priceId={id}
priceInfo={priceInfo}
recommended={false}
/>
</>
))}
</div>
</Col>
</Row>
</div>
</>
);
};
export default PaymentPackages;
如果我刪除它,PaymentList 就會出錯,那么就沒有錯誤,但我該如何解決這個警告,我不知道我做錯了什么。
鍵需要在最外層的元素上。 在您的情況下,最外面的元素是一個片段。 因此,如果不需要,請刪除片段:
{paymentPlan1.map(({ priceInfo, id }, i) => (
<PaymentList
key={id}
priceId={id}
priceInfo={priceInfo}
recommended={false}
/>
))}
或者將鍵向上移動到片段(您需要使用速記片段語法才能給它一個鍵):
{paymentPlan1.map(({ priceInfo, id }, i) => (
<React.Fragment key={id}>
<PaymentList
priceId={id}
priceInfo={priceInfo}
recommended={false}
/>
</React.Fragment>
))}
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