因此,问题在于,每当我按下删除按钮时,它都将删除删除操作,最后删除的输入和按钮与索引无关。我试图将密钥更改为key={
$ {index} $ {name}}`,但效果不佳,因为输入是可更改的(在主代码中),这使事情搞砸了。
如何根据索引正确删除?
function App() {
const [names, setNames] = React.useState(["First", "Second",'third','fourth']);
const onNameDelete = useCallback((index: number) => {
setNames((prev) => {
const name = names[index];
return prev.filter(x => x != name);
});
}, [names]);
return (
<div>
{names.map((name, index) => (
<Child
key={index}
name={name}
index={index}
onDelete={onNameDelete}
/>
))}
</div>
);
}
interface ChildProps {
name: string;
index: number;
onDelete: (index: number) => void;
}
export const Child: React.FC<ChildProps> = React.memo(
({ name, index, onDelete }) => {
return (
<div>
<input
defaultValue={name}
/>
<button onClick={() => onDelete(index)}>delete</button>
</div>
);
}
答案 0 :(得分:1)
在这里:
<link>
请使用对象数组代替存储名称的数组:
href