继续我的最后一个问题here ,我一直在尝试将引用映射到其他路线。滚动处理程序正在工作,但 ref.current
为 null
。所以我正在寻找这个困境的答案。 不使用外部依赖项,如何解决此问题?
应用程序.tsx
import React, { useEffect, useRef } from "react";
import { BrowserRouter, Route, NavLink, useLocation } from "react-router-dom";
import Home from "./pages/Home";
import "./styles.css";
const Header = ({ refs }) => {
const location = useLocation();
useEffect(() => {
console.log("location", location.pathname);
switch (location.pathname) {
case "/about":
scrollSmoothHandler(refs.aboutRef);
break;
case "/contact":
scrollSmoothHandler(refs.contactRef);
break;
case "/hero":
scrollSmoothHandler(refs.heroRef);
break;
default:
scrollSmoothHandler(refs.homeRef);
break;
}
}, [location, refs]);
const scrollSmoothHandler = ref => {
console.log("Triggered.");
console.log(ref.current);
//ref.current.scrollIntoView({ behavior: "smooth" });
};
return (
<>
<NavLink to="/hero" activeClassName="selected">
Hero
</NavLink>
<NavLink to="/about" activeClassName="selected">
About
</NavLink>
<NavLink to="/contact" activeClassName="selected">
Contact
</NavLink>
</>
);
};
function App() {
const homeRef = useRef(null);
const heroRef = useRef(null);
const aboutRef = useRef(null);
const contactRef = useRef(null);
return (
<div ref={homeRef} className="App">
<BrowserRouter>
<Header refs={{ aboutRef, contactRef, heroRef, homeRef }} />
<Route
exact
to="/"
refs={{ aboutRef, contactRef, heroRef, homeRef }}
component={Home}
/>
// More routes here.
</BrowserRouter>
</div>
);
}
export default App;
<小时/>
首页.tsx
import React, { Fragment, forwardRef, useRef } from "react";
import "../styles.css";
const Hero = forwardRef((props, ref) => {
return (
<section ref={ref}>
<h1>Hero Section</h1>
</section>
);
});
const About = forwardRef((props, ref) => {
return (
<section ref={ref}>
<h1>About Section</h1>
</section>
);
});
const Contact = forwardRef((props, ref) => {
return (
<section ref={ref}>
<h1>Contact Section</h1>
</section>
);
});
function Home(refs) {
const heroRef = useRef(refs.heroRef);
const aboutRef = useRef(refs.aboutRef);
const contactRef = useRef(refs.contactRef);
return (
<Fragment>
<Hero ref={heroRef} />
<About ref={aboutRef} />
<Contact ref={contactRef} />
</Fragment>
);
}
export default Home;
您可以找到我的代码沙箱的链接:here 。 fork 非常受欢迎。
最佳答案
如果不在组件上使用forwardRef,则无法将 refs 作为 props 传递给具有 name prop 的其他组件。您需要为其指定另一个名称才能使其工作,例如innerRefs。
还要将 refs 作为 prop 传递给 Route 组件,请使用 render prop 方法
应用程序.tsx
import React, { useEffect, useRef } from "react";
import { BrowserRouter, Route, NavLink, useLocation } from "react-router-dom";
import Home from "./pages/Home";
import "./styles.css";
const Header = ({ innerRefs }) => {
const location = useLocation();
useEffect(() => {
console.log("location", location.pathname);
switch (location.pathname) {
case "/about":
scrollSmoothHandler(innerRefs.aboutRef);
break;
case "/contact":
scrollSmoothHandler(innerRefs.contactRef);
break;
case "/hero":
scrollSmoothHandler(innerRefs.heroRef);
break;
default:
scrollSmoothHandler(innerRefs.homeRef);
break;
}
}, [location, innerRefs]);
const scrollSmoothHandler = innerRef => {
console.log("Triggered.");
console.log(innerRef.current);
innerRef.current.scrollIntoView({ behavior: "smooth" });
};
return (
<>
<NavLink to="/hero" activeClassName="selected">
Hero
</NavLink>
<NavLink to="/about" activeClassName="selected">
About
</NavLink>
<NavLink to="/contact" activeClassName="selected">
Contact
</NavLink>
</>
);
};
function App() {
const homeRef = useRef(null);
const heroRef = useRef(null);
const aboutRef = useRef(null);
const contactRef = useRef(null);
return (
<div ref={homeRef} className="App">
<BrowserRouter>
<Header innerRefs={{ aboutRef, contactRef, heroRef, homeRef }} />
<Route
exact
to="/"
render={routeProps => (
<Home
{...routeProps}
innerRefs={{ aboutRef, contactRef, heroRef, homeRef }}
/>
)}
/>
// More routes here.
</BrowserRouter>
</div>
);
}
export default App;
<小时/>
首页.tsx
import React, { Fragment, forwardRef, useRef } from "react";
import "../styles.css";
const Hero = forwardRef((props, ref) => {
return (
<section ref={ref}>
<h1>Hero Section</h1>
</section>
);
});
const About = forwardRef((props, ref) => {
return (
<section ref={ref}>
<h1>About Section</h1>
</section>
);
});
const Contact = forwardRef((props, ref) => {
return (
<section ref={ref}>
<h1>Contact Section</h1>
</section>
);
});
function Home({ innerRefs }) {
return (
<Fragment>
<Hero ref={innerRefs.heroRef} />
<About ref={innerRefs.aboutRef} />
<Contact ref={innerRefs.contactRef} />
</Fragment>
);
}
export default Home;
关于javascript - 在单独的路由中使用 useRef 响应滚动导航,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61277068/