问题描述
我设置了一个逻辑来使用我从端点 API 获取的数据在 react 中创建分页,其中包含我在此 UI 中显示的 5 个对象,然后我创建了一个我实现的函数 pageCount进入我的反应分页组件,当我点击移动到第二页时,它移动到最后一页,下一页,以前它们也不起作用。
这个问题从何而来?
谢谢
function App() {
//states
const [yogaCourses,setYogaCourses] = useState([]);
const [isLoading,setIsLoading] = useState(true);
const [levels,setLevels] = useState([]);
const [level,setLevel] = useState('');
const [pageNumber,setPageNumber] = useState(0);
//Paginate react
const coursePerPage = 2;
// const PageVisited = numberPage * coursePerPage;
const pageCount = Math.ceil(yogaCourses.length / coursePerPage);
console.log(pageCount);
//Track changes on each numberPage and display the data
useEffect(()=> {
setYogaCourses(yogaCourses.slice(pageNumber * 2,(pageNumber + 1) * 2))
},[pageNumber]);
//To the next Page
const pageChange = ({selected}) => {
setPageNumber(selected);
}
//levelChangeHandler
const levelChangeHandler = ({value}) => {
setLevel(value);
}
//Filter by Levels // stateless
const filterLevels = (level) => {
return yogaCourses.filter((singleLevel)=> level ? singleLevel.level === level : true);
}
//Function to fetch the data from the API
const GetCourses = async () => {
const response = await axios.get(url)
const {data} = response;
return data;
}
//UseEffect to run the function on every render
useEffect(()=> {
const GetCoursesYoga = async () => {
const result = await GetCourses();
setYogaCourses(result);
setLevels(Array.from(new Set(result.map((result)=> result.level))));
}
GetCoursesYoga();
},[]);
//check if the we got response
useEffect(()=> {
if(yogaCourses.length > 0) {
setIsLoading(false);
}
},[yogaCourses])
if(isLoading) {
return (
<Loading/>
)
}
else {
return (
<main>
<div className="title">
<h2>YOUR PRACTICE REIMAGINED</h2>
</div>
<LevelsFilter levels={levels} onChange={levelChangeHandler}/>
<YogaCourses yogaCourses= {(filterLevels(level)).slice(0,2)}/>
<ReactPaginate
prevIoUsLabel = {"PrevIoUs"}
nextLabel = {"Next"}
pageCount = {pageCount}
onPageChange= {pageChange}
/>
</main>
);
}
}
export default App;
解决方法
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