我正在尝试使用 React Hooks 设置无限滚动,我从节点后端正确获取数据(每个请求 3 个数据集),当我滚动时,新数据也被正确添加到数组(处于 loadedPlaces 状态),但页面在重新呈现时返回顶部,我需要防止这种行为。我该如何防止这种情况,下面是我的代码
import React, { useEffect, useState } from "react";
import "./App.css";
function App() {
const [page, setPage] = useState(1);
const [loadedPlaces, setLoadedPlaces] = useState([]);
const [isLoading, setIsLoading] = useState(false);
useEffect(() => {
const getPlaces = async () => {
try {
setIsLoading(true);
const url = `http://localhost:5000/api/places/user/${id}?page=${page}&size=3`;
const responseData = await fetch(url);
const data = await responseData.json();
console.log(data);
setLoadedPlaces((prev) => [...prev, ...data.places]);
setIsLoading(false);
} catch (error) {}
};
getPlaces();
}, [page]);
window.onscroll = function (e) {
if (
window.innerHeight + document.documentElement.scrollTop ===
document.documentElement.offsetHeight
) {
setPage(page + 1);
}
};
return (
<div className='App'>
<h1>Infinite Scroll</h1>
{!isLoading &&
loadedPlaces.length > 0 &&
loadedPlaces.map((place, index) => (
<div key={index} className={"container"}>
<h1>{place.location.lat}</h1>
<h1>{place.location.lng}</h1>
<h1>{place.title}</h1>
<h1>{place.description}</h1>
<h1>{place.address}</h1>
<hr></hr>
</div>
))}
</div>
);
}
export default App;
非常感谢任何帮助
最佳答案
发生这种情况是因为无论何时滚动你都在调用
window.onscroll = function (e) {
if (
window.innerHeight + document.documentElement.scrollTop ===
document.documentElement.offsetHeight
) {
setPage(page + 1);
}
};
它改变了页数,改变的页数导致再次运行
useEffect(() => {
const getPlaces = async () => {
try {
setIsLoading(true);
const url = `http://localhost:5000/api/places/user/${id}?page=${page}&size=3`;
const responseData = await fetch(url);
const data = await responseData.json();
console.log(data);
setLoadedPlaces((prev) => [...prev, ...data.places]);
setIsLoading(false);
} catch (error) {}
};
getPlaces();
}, [page]);
并且在该函数中,您正在执行 setIsLoading(true)
以便它再次呈现它,因为
{!isLoading && <-----
loadedPlaces.length > 0 &&
loadedPlaces.map((place, index) => (
<div key={index} className={"container"}>
<h1>{place.location.lat}</h1>
<h1>{place.location.lng}</h1>
<h1>{place.title}</h1>
<h1>{place.description}</h1>
<h1>{place.address}</h1>
<hr></hr>
</div>
))}
这会将您带到页面顶部
你可以试试这个方法:
import React, { useEffect, useState } from "react";
import "./App.css";
function App() {
const [page, setPage] = useState(1);
const [loadedPlaces, setLoadedPlaces] = useState([]);
const [isLoading, setIsLoading] = useState(false);
useEffect(() => {
const getPlaces = async () => {
try {
setIsLoading(true);
const url = `http://localhost:5000/api/places/user/${id}?page=${page}&size=3`;
const responseData = await fetch(url);
const data = await responseData.json();
console.log(data);
setLoadedPlaces((prev) => [...prev, ...data.places]);
setIsLoading(false);
} catch (error) {}
};
getPlaces();
}, [page]);
window.onscroll = function (e) {
if (
window.innerHeight + document.documentElement.scrollTop ===
document.documentElement.offsetHeight
) {
setPage(page + 1);
}
};
return (
<div className='App'>
<h1>Infinite Scroll</h1>
{
loadedPlaces.length > 0 &&
loadedPlaces.map((place, index) => (
<div key={index} className={"container"}>
<h1>{place.location.lat}</h1>
<h1>{place.location.lng}</h1>
<h1>{place.title}</h1>
<h1>{place.description}</h1>
<h1>{place.address}</h1>
<hr></hr>
</div>
))}
</div>
);
}
export default App;
关于reactjs - 在 React 中使用 Hooks 停止/防止滚动到顶部重新渲染(需要实现无限滚动),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/68457639/