所以我的頁面是一個作者頁面，它在我從 API 獲取然后映射的每張卡片中顯示不同的作者及其詳細資訊。 https://i.stack.imgur.com/eSD7u.png
在每張卡片中，點擊后它會變為洗掉收藏夾。收藏的卡片使作者狀態的物件陣列中的 idfav 為真，如果不收藏則為假。還有一個第二頁顯示了所有最喜歡的作者。現在我首先將它作為作者狀態的本地存盤傳遞下來，但是如果我單擊按鈕，無論按鈕是添加還是洗掉，所有其他卡/陣列都被洗掉并且只有卡在我的第二次重新加載之后我選擇的按鈕出現了。
const [author, setAuthor] = useState([]);
const [AuthorTempState, setAuthorTempState] = useState([]);
// pagination calculation
const [PageNumber, setPageNumber] = useState(0);
const [Postsperpage] = useState(4);
const PagesVisited = PageNumber * Postsperpage;
const pageCount = Math.ceil(author.length / Postsperpage);
const changePage = ({ selected }) => {
setPageNumber(selected);
}
const getAuthors = async () => {
const res = await fetch(`https://api.quotable.io/authors?limit=30`);
const data = await res.json();
for (const element of data.results) {
element.idfav = false;
}
data.results.sort((a, b) => (a._id > b._id) ? 1 : -1)
setAuthor(data.results);
setAuthorTempState(data.results);
}
const saveAuth = () => {
localStorage.setItem('authors', JSON.stringify(author));
}
const getAuth = () => {
const newAuthors = JSON.parse(localStorage.getItem('authors'));
if (newAuthors && newAuthors.length > 0) {
setAuthor(newAuthors);
} else {
getAuthors();
}
}
useEffect(() => {
// console.log((author));
if (author.length === 0) {
getAuth();
}
saveAuth();
}, [author]);
const favBttn = (Auth) => {
const filterData = AuthorTempState.filter(data => data._id !== Auth._id)
Auth.idfav = true;
const updateAuthor = [Auth, ...filterData]
updateAuthor.sort((a, b) => (a._id > b._id) ? 1 : -1)
setAuthor(updateAuthor)
}
const remfavBttn = (Auth) => {
const filterData = AuthorTempState.filter(data => data._id !== Auth._id)
Auth.idfav = false;
const updateAuthor = [Auth, ...filterData]
updateAuthor.sort((a, b) => (a._id > b._id) ? 1 : -1)
setAuthor(updateAuthor);
}
const Author = author.slice(PagesVisited, PagesVisited Postsperpage)
return (
<div className="AppWhole">
<AuthorSidebar />
<div className="App">
<div className="author">
{Author.map(
(Author) => (
<div className="authors" key={Author._id}>
{
(Author.idfav) ? (<button className='right' onClick={() => {
remfavBttn(Author);
}}>Remove Favt.</button >) : (<button className='right' onClick={() => {
favBttn(Author);
}}>Add Favt.</button >)
}
<p>Name: {Author.name}</p>
<p>Bio: {Author.bio}</p>
<p>Wiki: <a href='{Author.link}'>{Author.link}</a></p>
</div>
))}
<div id='pageauthor'>
<ReactPaginate
pageCount={pageCount}
onPageChange={changePage}
previousLabel={"<<"}
nextLabel={">>"}
containerClassName={'paginationLinks'}
disabledClassName={'paginationDisabled'}
activeClassName={'paginationActive'}
/>
</div>
</div>
</div>
</div>
);
}
export default Authors;
請幫助我，我已經堅持了一周。謝謝你。
uj5u.com熱心網友回復：
好的，一旦我閱讀了您的整個代碼，然后閱讀了您的問題，就很清楚出了什么問題。問題在這里
const favBttn = (Auth) => {
// notice that you are using AuthorTempState to filter data
// but do you remember initialising it when the data is found in local storage?
// AuthorTempState is currently an empty array.
const filterData = AuthorTempState.filter(data => data._id !== Auth._id)
Auth.idfav = true;
const updateAuthor = [Auth, ...filterData]
updateAuthor.sort((a, b) => (a._id > b._id) ? 1 : -1)
setAuthor(updateAuthor)
}
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