对React Router不太熟悉,但是我需要NavLink的功能来在父li
元素上设置事件类,而不是a
元素。
为了实现这一点,我只是查看了NavLink
的源代码并将其复制到一个新元素中。 (使用 typescript 的示例,但无论如何都与js差不多)
import * as React from 'react';
import { Link, withRouter, Route } from 'react-router-dom';
class LiNavLink extends React.Component<any, {}> {
render() {
const {to,exact, strict, activeClassName, className, activeStyle, style, isActive: getIsActive, ...rest } = this.props;
return (
<Route
path={typeof to === 'object' ? to.pathname : to}
exact={exact}
strict={strict}
children={({ location, match }) => {
const isActive = !!(getIsActive ? getIsActive(match, location) : match)
return (
<li
className={isActive ? [activeClassName, className].join(' ') : className}
style={isActive ? { ...style, ...activeStyle } : style}>
<Link
to={to}
{...rest}
/>
</li>
)
}}
/>
);
}
}
export default LiNavLink;
然后的用法:
<ul>
<LiNavLink activeClassName='active' exact={true} strict to="/example"><span>Active</span></LiNavLink>
<LiNavLink activeClassName='active' exact={true} strict to="/example/archived"><span>Archived</span></LiNavLink>
</ul>
我使用的是
HashRouter
,由于某种原因(我无法弄清楚),该路由不会在路由更改时更新,只有当我“刷新”页面时才会更新它。我相信它永远不会更新,因为 Prop 永远不会改变吗?所以它不知道自己更新吗?
我如何获得此更新?还是我的问题在别的地方?
最佳答案
在v4中,我做了很多尝试。
这是我的工作代码。
import React, { Component } from "react";
import logo from "../../logo.svg";
import { Link, withRouter } from "react-router-dom";
import PropTypes from "prop-types";
class Navbar extends Component {
static propTypes = {
match: PropTypes.object.isRequired,
location: PropTypes.object.isRequired,
history: PropTypes.object.isRequired
};
state = {};
getNavLinkClass = path => {
return this.props.location.pathname === path
? "nav-item active"
: "nav-item";
};
render() {
return (
<nav className="navbar navbar-expand-lg navbar-dark bg-dark">
<Link className="navbar-brand" to="/">
<img
src={logo}
width="30"
height="30"
className="d-inline-block align-top"
alt=""
/>
Utility
</Link>
<button
className="navbar-toggler"
type="button"
data-toggle="collapse"
data-target="#navbarNav"
aria-controls="navbarNav"
aria-expanded="false"
aria-label="Toggle navigation"
>
<span className="navbar-toggler-icon" />
</button>
<div className="collapse navbar-collapse" id="navbarNav">
<ul className="navbar-nav">
<li className={this.getNavLinkClass("/")}>
<Link className="nav-link" to="/">
Home
</Link>
</li>
<li className={this.getNavLinkClass("/age-counter")}>
<Link className="nav-link" to="/age-counter">
Age Counter
</Link>
</li>
</ul>
</div>
</nav>
);
}
}
export default withRouter(Navbar);
演示版工作Code Sandbox